1
Seal Bay Brook Marks Lake 360 c c c c c c ccmmm c m m m m m m c c c c c c ccmmm c m m m m m m c c c cc c c mm ccm mmm m m m m mm m m m m m c c c cc c c mm ccm mmm m m m m mm m m m m m c cc cc ccccb b c cc cc ccccb b c cc c cv vv v vv v c c c c vvv v v vv v v v vvv vv v v v c cc c cv vv v vv v c c c c vvv v v vv v v v vvv vv v v v c c c c cccccnn c c c c cccccnn cc cc c n cc bb n c c b bb b n b b b b b b b bb bb bb b b b bb bbbb bb b bbb b b b b b bb n n nn b b bbbb b b n n bb bb b bb nn bbb b n b b b b n n bb bb b nn b b n n gg n b bbb bn n gg cc cc c n cc bb n c c b bb b n b b b b b b b bb bb bb b b b bb bbbb bb b bbb b b b b b bb n n nn b b bbbb b b n n bb bb b bb nn bbb b n b b b b n n bb bb b nn b b n n gg n b bbb bn n gg cc c c cvvvvvvvv cccc vv v vv v vv v v vvv vv v v vvv v v v vv v v v v vv v v v v vv v v vvv vvv vv v v v vvv v vvvv vv v v v v v m cc c c cvvvvvvvv cccc vv v vv v vv v v vvv vv v v vvv v v v vv v v v v vv v v v v vv v v vvv vvv vv v v v vvv v vvvv vv v v v v v m Robert’s Arm Robert’s Arm BADGER BAY BAY SEAL Wild Bight Sops Arm NORTH TWIN LAKE S O U T H T W I N L A K E C r e s c e n t L a k e Sops Lake Island Gull Kay I. K i ppe n s P o n d Side Harbour Pennys Brook Shoal Arm Brook Tommys Arm River Lewis Big Lake Little Lewis Lake Kerry Lake Tommys Arm Shoal Arm Gummy Pond 32 32 32 32 32 32 32 32 32 32 32 32 32 32 13 13 29 29 24 24 24 11 11 11 11 11 7b 7b 7b 7b 7b 7b 7b 7b 7b 7b 7b 7b 7b 7b 7b 7b 7b 7b 7b 7b 7b 7b 7b 7b 7b 7b 7b 7b 7b 7b 7b 7b 11 11 7a 7a 7a 7a 7a 7a 7a 7a 7a 7a 7a 7a 7a 7a 7a 7a 7a 7a 7a 7a 7a 7a 7a 7a 7a 7a 7a 7a 7a 7a 7a 7a 7a 7a 7a 7a 7a 7a 7a 7a 7a 7a 7a 7a 7a 7a 7a 7a 7a 7a 7a 7a 7a 7a 7a 7a 7a 7a 7a 7a 7a 7a 7a 7a 7a 7a 7a 7a 7a 7a 7a 7a 7a 7a 7a 7a 7a 7a 7a 7a 7a 7a 7a 7a 7a 30 30 30 28 28 28 28 29 29 29 29 29 29 24 24 24 24 24 24 18 18 31 31 31 31 31 31 12 12 12 12 12 18 18 18 18 22 22 22 13 13 13 13 13 13 13 13 13 13 8 8 8 8 8 8 8 8 8 8 8 17 9 9 9 26 26 26 26 26 26 26 25 25 12 2c-m 2c-m 2c-f 6 6 6 6 4 4 2d-m 13 12c 12c 12c 2d-fm 5c 5c 5c 3a 3a 1 1 1 1 1 1 1 1 2 3a 3a 3a 12c 6 6 3a 3a 3a 3a 3a 3a 3a 6 5a 2e-f 2e-f 3a 3a unmapped 56 00 56 00 55 30 49 30 49 30 55 30 49 15 49 15 55 55 50 50 45 45 40 40 35 35 25 25 20 20 5457000m. N. 609000m. E. 600000m. E. 590000m. E. 580000m. E. 573000m. E. 5456000m. N. 5460000m. N 5460000m. N 5470000m. N. 5480000m. N. 5483000m. N. 5483000m. N. 573000m. E. 580000m. E. 590000m. E. 600000m. E. 608000m. E. 5480000m. N 5470000m. N. 2L 12I 12B 12B 2D 1N 1N 60° 52° 51° 50° 49° 48° 47° 51° 50° 49° 48° 47° 7 58° 56° 54° 58° 56° 54° 12H 12A 1M 1M 2E 2E 2M 2C 2C 1K 11P 11O 2F St. Anthony Port aux Basques Deer Lake Stephenville Stephenville Grand Falls Gander St. John's J 12G Labrador 1L 11I NEWFOUNDLAND 0 150 km 50 100 INDEX MAP 12P 12P Corner Brook Corner Brook Examined exposure location ............................................................... Strike and dip of bedding (tops known) ............................................... Strike and dip of bedding (tops unknown) ........................................... Strike and dip of bedding (overturned) ................................................ Strike and dip of igneous layering ....................................................... Stratigraphic boundary or intrusive contact (approximate) .................. Pseudoporphyroblast-bearing alteration zone ..................................... Anticline [locally neutral or synformal] with plunge direction indicated (upright, overturned) ............................................................ Syncline [locally neutral or antiformal] with plunge direction indicated (upright, overturned) ........................... Reverse faults [relative age unspecified] (barbs drawn on original hangingwall sequence) ........................................................... Strike-slip component of fault movement (sinistral, dextral) ................ Cross fault (post-thrusting and folding) ................................................ Note: Only selected symbols for bedding and igneous layering are shown on map; measurements for other structures are omitted, but are available in digital form on request. Symbols are offset in position from exposure locations. SYMBOLS ccc bbh ccc bbh GOVERNMENT OF NEWFOUNDLAND AND LABRADOR Department of Mines and Energy Geological Survey MAP 2001-38 OPEN FILE 002E/05/1160 GEOLOGY OF PART OF THE ROBERT'S ARM MAP AREA (NTS 2E/5), WESTERN NOTRE DAME BAY 0 1 2 3 4 5 kilometres Scale 1:50 000 Geology by B. H. O’Brien, 1990; B. H. O’Brien and D. L. MacDonald, 1996; B. H. O’Brien, and M. E. Rees,1997; B. H. O’Brien and B. McConnell, 1999; B. H. O’Brien, A.Pickett and L. Normore, 2000. Base map in digital format published by Surveys and Mapping Branch, Natural Resources Canada, Ottawa. Approximate magnetic declination, 1980, at centre of map 26 30' W, decreasing 11.6' annually. Elevations in metres above sea level. Universal Transverse Mercator Projection (UTM) Zone 21. North American Datum (NAD) 1927. Copies of this map may be obtained from the Geoscience Publications and Information Section, Geological Survey, Department of Mines and Energy, Government of Newfoundland and Labrador, P.O. Box 8700, St. John’s, Newfoundland, Canada A1B 4J6 [http://www.geosurv.gov.nf.ca]. This map is subject to revision and modification. Geological cartography by A. H. Paltanavage. O’Brien, B. H. 2001: Geology of part of the Robert's Arm map area (NTS 2E/5), western Notre Dame Bay. Scale 1:50 000. Newfoundland Department of Mines and Energy, Geological Survey, Map 2001-38, Open File 002E/05/1160. Recommended Citation Middle Ordovician - Early Devonian STRATIFIED AND INTRUSIVE ROCKS OF THE NOTRE DAME SUBZONE Early to Middle Ordovician RED INDIAN LINE STRUCTURAL ZONE Middle Ordovician (?) HODGES HILL INTRUSIVE COMPLEX ROBERTS ARM GROUP SOPS HEAD COMPLEX TWIN LAKES DIORITE Early to Late Silurian (?): CRESCENT LAKE FORMATION Early Middle Ordovician (?): Late Early Ordovician (?): UNSEPARATED TERRANES/FORMATIONS (of the ROBERTS ARM GROUP) Early or Middle Ordovician (?): Late Early Ordovician (?): Late Early Ordovician (?): TECTONIZED BLOCK-IN-MATRIX MELANGE UNIT Middle Ordovician to Late Silurian (?): BROKEN OLISTOSTROMAL UNITS Middle Ordovician: Early to Middle Ordovician (?): Early to Middle Ordovician (?): Early to Middle Ordovician (?): Early to Middle Ordovician (?): Early to Middle Ordovician (?): UNBROKEN LITHOSTRATIGRAPHIC UNITS Middle Ordovician (?): Middle Ordovician (?): Middle Ordovician (?): Middle Ordovician (?): medium-grained leucocratic granodiorite; medium-grained equigranular grey gabbro; minor coarse-grained hornblende diorite; rare leucogranite veins; posttectonic relative to structures in the Exploits and Notre Dame subzones interbedded bright-red and dark-red chert; maroon, thin-bedded siltstone and siliceous laminated argillite; light-green, medium-bedded, siliceous sandstone; grey-green, medium- to thick-bedded wacke having distinctive jasper, granite and basalt pebbles; sedimentary rocks of units 29 and 30 unseparated Green sandstone turbidites containing abundant jasper clasts, poorly bedded wacke containing red chert and basalt clasts, and polymictic conglomerate containing conspicuous volcanic and plutonic boulders Red and grey chert rhythmites interbedded with thin-bedded siliceous argillite and graded grey sandstone light-green, massive, aphanitic, vesicular basalt; light-green basalt breccia and pillow breccias; dark-green, fine-grained, pyroxene-porphyritic basalt; minor, green and red, variably hematized, pillowed basalt with red chert veins near Tommys Arm river estuary (possible thrust slice of Unit 26); rare interstitial red chert and interflow red argillite; Crescent “terrane” of previous workers gabbro sills; unseparated diorite sheets pillow lava and pillow breccia; dark-green, massive, vesicular, variably porphyritic, locally flow- foliated basalt; pillowed basalts containing epidote-rich and hematite-rich zones in concentric bands and as veinlets; variably hematized basalt associated with minor interstitial and interflow red chert light-grey, massive, quartz-phyric felsite; buff to pink, felsic crystal tuff having eutaxitic quartz grains; variably chloritized, felsic lithic tuff (locally containing silicified rock fragments); felsic breccia and subordinate basalt blocks; minor quartz-feldspar porphyry dark-grey melange dominated by small polylithic blocks having internal foliations or internal folds; platey, pyrite-rich, black phyllite or pelitic schist (locally forming the matrix of the melange belt or representing an original mudstone-bearing map unit); minor porphyroclastic schist derived from semi-psammite and metabasite; minor red-matrix melange derived from hematitic basalt and protomylonite; minor green-matrix melange derived from chloritic basalt and cataclastite Sparry Limestone– conodont-bearing limestone in stratigraphic contact with various basalt types in discrete volcanic blocks; limestone beds forming solitary carbonate megablocks and smaller olistoliths in melange; limestone clasts resedimented along with monolithic basalt clasts in alternating muddy and calcareous debrites; banded marble interstratified or tectonically interlayered with pyritic black argillite. Similar lithodemes within large limestone clasts in Unit 10. Also, in the basal Moores Cove Formation of the Cottrells Cove Group, the Hummock Island Limestone of the Exploits Group, and the Cutwell Group on Long Island Basalt Flows– internally-fractured, marginally-shattered epidotized basalt (injected by green epiclastic wacke - itself impregnated with black mudstone); massive, light-green, fine-grained, silicified basalt (in depositional contact with siliciclastic and calcareous sedimentary strata within map-scale blocks); pillow breccia and hematized basalt (resedimented with jasper and chert in red siliceous debrite); minor olistoliths of basalt breccia (chilled against mudstone) in a matrix of fractured volcaniclastic wacke; the above rocks are seen in the dominantly sand-matrix debrite belts. The dominantly mud-matrix debrite belts display light-green and dark-grey aphanitic basalt (injected by black mudstone) and porphyritic vesicular basalt (augened by featureless black mudstone, or wrapped by partially broken interbeds of pyritic black argillite and dark-grey laminated siltstone, or partly enclosed by black pebbly mudstone). Similar lithodemes in Unit 16. Also, in the Pennys Brook Formation of the Wild Bight Group and the Crescent Lake Formation of the Roberts Arm Group Mottled Turbidite and Variegated Chert– green and grey, parallel- and cross-laminated, rhythmically interbedded, siliceous turbidites having mottled and nodular texture (forming mottled olistoliths within unmottled pebbly mudstone). Minor red, green and grey chert interbedded with laminated siliceous argillite. Similar lithodemes in units 14 and 17 Polymictic Conglomerate– thickly stratified, poorly sorted, graded conglomerate beds with distinctive basalt, limestone and granite boulders (partly or completely enclosed by chaotically deformed sandy debrite); small, massive, buff-weathered conglomerate blocks (within muddy debrites); conglomeratic turbidite lenticles (preserving erosive bases above black pyritic argillite and channels within interstratified sandstone turbidites). Similar unbroken lithodemes in Unit 10 Black Argillite - Pebbly Mudstone– sulphidic pebbly mudstone (showing in-situ Massive Wacke– buff-weathered, massive, granular wacke completely or partially surrounding polylithic blocks in debrites; minor, partially disaggregated interbeds of light-grey wacke and dark-grey argillite. Unbroken successions of similar wacke (interstratified with thin-bedded sandstone and siltstone) may occur in Unit 8 [Wild Bight Group / Exploits Group / Roberts Arm Group / Cottrells Cove Group] interbedded, red and green chert; deep-red and bright-red, thin-bedded, laminated argillite; green and grey, medium-bedded, fine-grained, siliceous, sandstone turbidite. In places, Unit 17 is interlayered with Unit 16 or stratigraphically overlies Unit 16. Similar lithodemes occur in the lower Crescent Lake Formation of the Roberts Arm Group, the lower Moores Cove Formation of the Cottrells Cove Group, the lower Strong Island Chert of the Exploits Group, and the lower Shoal Arm Formation (as well as in Late Cambrian(?) to Middle Ordovician units such as the Omega Point Formation of the Wild Bight Group and the Saunders Cove Formation of the Exploits Group) light-green, variably porphyritic, basalt flows; massive, poorly stratified and well-graded basalt breccias; minor flow-foliated vesicular basalt; rare pillow breccia with epiclastic or calcareous cement; rare, grey aphanitic, mafic to intermediate, volcanic flows thinly bedded, grey, banded, microcrystalline chert interstratified with sulphidic and siliceous, black argillite; minor, buff-weathered, light-grey, net-veined and recrystallized chert; these rocks are interlayered with Unit 14 or stratigraphically overlie Unit 14 mottled, green and grey, parallel- and cross-laminated, siliceous turbidites; nodular, fine-grained, thin-bedded, graded sandstone containing mud microflakes and sandstone dykelets; rhythmic interbeds of dark-green cherty siltstone and dark-grey banded argillite. Unit 14 underlies and also overlies Unit 16 and is in depositional contact with units 9 and 10; similar lithodemes are present in the upper Pennys Brook Formation of the Wild Bight Group, the lower Shoal Arm Formation, and the upper New Bay Formation of the Exploits Group fragmentation of slumped grey siltstone and black argillite beds); basalt block-in-argillite within conglomerate block-in-argillite within pebbly mudstone or sandy debrite; stratiform intervals of coherently-bedded black argillite (forming a substrate, devoid of chert, to basalt or conglomerate sequences). Similar unbroken lithodemes in Unit 9. BADGER GROUP (Unit 13) EXPLOITS GROUP WILD BIGHT GROUP SOUTH LAKE IGNEOUS COMPLEX STRATIFIED AND INTRUSIVE ROCKS OF THE EXPLOITS SUBZONE Late Ordovician Middle and Late Ordovician (?) Middle Ordovician (?) Late Cambrian (?) to Middle Ordovician Cambro-Ordovician GULL ISLAND FORMATION Early Late Ordovician: SHOAL ARM FORMATION Late Middle Ordovician to Early Late Ordovician (?): GUMMY BROOK GABBRO NEW BAY FORMATION Late Early Ordovician: Late Early Ordovician (?): Late Early Ordovician (?): PENNYS BROOK FORMATION Early Middle to Late Middle Ordovician: SPARROW COVE FORMATION Early to Middle Ordovician (?): SIDE HARBOUR (?) BASALT UNIT Early to Middle Ordovician (?): BANDED GREY ARGILLITE UNIT Early to Middle Ordovician (?): OMEGA POINT FORMATION Early to Middle Ordovician (?): GLOVERS HARBOUR FORMATION Late Cambrian (?) to Early Ordovician: Late Cambrian (?) to Early Ordovician: predominantly massive, quartz-rich granular to pebbly wacke; minor thin- and thick-bedded, light- grey sandstone turbidites; rare olistostrome along southwest margin of unit; rare cobble conglomerate (with fossiliferous limestone clasts) along northwest margin of unit black graptolitic slate interstratified with very thin beds of pyritic carbonaceous siltstone and dark-grey siliceous argillite; light-grey bioturbated chert containing rare black shale partings; light-grey, thin-bedded to laminated, silicified wacke interbedded with green siliceous argillite and irregularly- mottled sandstone; red radiolarian chert, red laminated argillite and red siliceous siltstone containing slump-folded nodules; maroon and green siltstone rhythmites (containing pyrolusite-bearing horizons) interbedded with turquoise chert Medium-grained equigranular gabbro sills; minor dark-grey diorite sheets; coarse-grained glomeracrystic gabbro and diabase (in places cutting epidotized and saussuritized gabbro); pretectonic relative to structures in the Exploits Subzone polymictic, cobble-to-boulder, clast-supported conglomerate with well-rounded siliciclastic, calcareous and magmatic clasts; massive, light-grey pebbly wacke; depositional contacts with Unit 8 and Unit 9. Similar lithodemes are also presently assigned to the upper Moores Cove Formation of the Cottrells Cove Group and the upper Crescent Lake Formation of the Roberts Arm Group dark-grey and black, laminated and siliceous, siltstone turbidites; black, pyritic argillite or pyritic slate; minor, light-green, slump-folded sandstone with interbedded or chaotically mixed mudstone thin interbeds of light green sandstone and dark grey siltstone; minor, light grey, medium- bedded granular wacke; rare, dark-grey and black sulphidic argillite; all rocks are siliceous and highly indurated thin-bedded, green and grey, variably mottled, concretionary turbidites; thin- and thick-bedded, grey-green sandstone containing imbricated rip-up clasts of slump-folded banded argillite grading to parallel-laminated sandstone; thickly stratified, dark-green, tuffaceous wacke with predominant vesicular basalt and subordinate intermediate to felsic volcanic clasts; massive to thickly bedded epiclastic wacke (and associated debrites) with mixed sedimentary and volcanic clasts; minor pebbly wacke containing distinctive jasper and red argillite clasts. laterally discontinuous lenticles of pillow lava, pillow breccia and massive vesicular basalt breccia; associated sand-matrix olistostromes and chaotically-slumped mixtites with various volcanic and sedimentary intraclasts dark-green, porphyritic pillow lava with some interstitial variegated chert; subordinate, thin- bedded, light-green, graded sandstone and light-grey, parallel-laminated argillite interstratified with vesicular basalt flows; minor gabbro sills, rare tuff beds and rip-up clasts of tuffaceous wacke pillow lava, pillow breccia, minor chert and turbidite in the Side Harbour Pond area, pillow lava associated with jasper-bearing chert and siliceous red argillite; siliceous, hematite-rich vesicular basalt; minor, maroon siltstone lenses intercalated with amygdaloidal basalt flows [possibly Omega Point Formation?]. in the Seal Bay Bottom area, green vesicular pillow lava transitional to red pillow lava containing jasper disseminations; hematite-rich pillow breccia with interstitial red chert; collapsed, slumped and variably disaggregated pillowed basalt in sand-matrix debrite; minor gabbro sills; rare green laminated sandstone and red siliceous argillite [possibly lower Omega Point Formation? or upper Glovers Harbour Formation?]. in the upper Seal Bay Brook area, hematite-, epidote- and chlorite-bearing pillowed basalt, vesicular pillow lava having jasper disseminations; red and green basalt breccia, in places, grading to fine-grained mafic tuff; local zones of highly discoidal pillow breccia with interstitial red chert; minor jasper-bearing chert and maroon argillite interbeds; rare diorite sills [possibly Omega Point Formation? or, alternatively, upper Pennys Brook Formation?] in the Little Lewis Lake area, thin interbeds of dark-grey shale and light-grey siltstone, laminated and banded siliceous grey argillite, carbonaceous dark-grey slate; minor debrite dominated by various sedimentary blocks. In the Seal Bay Brook - Big Lewis Lake area, mostly debrite having banded argillite blocks and altered volcanic blocks [possibly uncommonly thick part of Omega Point Formation?] red, massive to thickly stratified, poorly sorted gravel beds with subrounded cobbles and boulders of hematized volcanic and intrusive rocks; chaotically-slumped debrite and red conglomeratic wacke; red chert, red siliceous argillite and hematitic banded iron formation; interbedded, red and green, parallel- and cross- laminated siltstone turbidites (having spotted pseudoporphyroblasts in places); dark grey carbonaceous shale; light grey, thickly stratified, polymictic, conglomeratic turbidite. in the Long Pond area, pillowed basalt flows interstratified with red chert, red siliceous argillite, maroon siltstone and grey-green wacke [possibly Side Harbour Basalt?] interstratified rhyolite and basalt; minor felsic porphyry and diabase dominantly felsic intrusive and volcanic rocks of the Long Pond area: hematite-rich quartz-feldspar porphyry (locally injected by red chert veinlets); light-grey rhyolite breccia and pyritic felsic tuff; rare, purplish-red rhyolite dykes. dominantly mafic volcanic rocks of the Long Pond area: dark green pillow breccia and light-green basalt flows; minor mixed mafic–felsic volcanic breccia dominantly mafic volcanic rocks of the Little Lewis Lake area: red basalt breccia containing disseminated jasper, green vesicular basalt with pyritic quartz stringers; minor slump-folded grey argillite (partially enclosing mafic volcanic blocks) dominantly felsic volcanic rocks of the Kerry Lake–Nanny Bag Lake area: light-grey, well-banded, flow-folded rhyolite intruded by diabase dykes; minor basalt flows. dominantly mafic volcanic rocks of the Kerry Lake–Nanny Bag Lake area: dark-green chloritic pillowed basalt, light-green, epidote-rich, pyritic, net-veined basalt; minor, variegated, red and green, vesicular pillow lava dominantly mafic volcanic rocks of the Big Lewis Lake–New Bay Pond area: massive, dark-grey and dark-green basalt flows; minor pillow breccia grading to tuffaceous wacke; rare mafic tectonite. unseparated mafic and felsic volcanic rocks of the Big Lewis Lake–New Bay Pond area: light-green siliceous basalt breccia, dark-green pyritic basalt flows, felsic–mafic crystal lithic tuff; minor debrite with banded argillite and siliceous basalt blocks dominantly felsic volcanic rocks of the Indian Cove - Corner Point area: purplish-red rhyolite breccia and hematitic flow-banded rhyolite; light-grey, pyritic, rhyolite-dominant volcanic breccia; mixed mafic–felsic volcanic breccia (having outsized basalt bombs and silicified flow-banded rhyolite blocks); minor, light-green, quartz-phyric crystal tuff; minor quartz-feldspar porphyry; rare, purplish-red rhyolite dykes. dominantly mafic volcanic rocks of the Indian Cove - Corner Point area: dark-green pillowed basalt, light-green basalt breccia; minor diorite and diabase unseparated mafic and felsic plutonic rocks, including layered gabbro (having swarms of sheeted mafic dykes); flaser-banded metagabbro (in places, hosting small gossan zones); medium-grained, locally pyritic, blue-quartz tonalite (containing metagabbro enclaves); minor hornblende diorite and gabbro pegmatite 12a: 12b: 12c: 7a: 7b: 5a: 5b: 5c: 3a: 3b: 2a-f: 2a-m: 2b-m: 2c-f: 2c-m: 2d-m: 2d-fm: 2e-f: 2e-m: 32 31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16 15 14 13 12 11 10 9 8 7a 7b 6 5 4 3b 3a 2 2a-f 2a-m 2b-m 2c-f 2c-m 2d-m 2d-fm 2e-f 2e-m 1 LEGEND

2e5map c.cdr:CorelDRAW · Base map in digital format published by Surveys and Mapping Branch, Natural Resources 3a 11 Approximate magnetic declination, 1980, at centre of map 26 30

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Page 1: 2e5map c.cdr:CorelDRAW · Base map in digital format published by Surveys and Mapping Branch, Natural Resources 3a 11 Approximate magnetic declination, 1980, at centre of map 26 30

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INDEX MAP

12P12P

CornerBrook

CornerBrook

Examined exposure location ...............................................................

Strike and dip of bedding (tops known) ...............................................

Strike and dip of bedding (tops unknown) ...........................................

Strike and dip of bedding (overturned) ................................................

Strike and dip of igneous layering .......................................................

Stratigraphic boundary or intrusive contact (approximate) ..................

Pseudoporphyroblast-bearing alteration zone .....................................

Anticline [locally neutral or synformal] with plunge direction

indicated (upright, overturned) ............................................................

Syncline [locally neutral or antiformal]

with plunge direction indicated (upright, overturned) ...........................

Reverse faults [relative age unspecified] (barbs drawn on

original hangingwall sequence) ...........................................................

Strike-slip component of fault movement (sinistral, dextral) ................

Cross fault (post-thrusting and folding) ................................................

Note: Only selected symbols for bedding and igneous layering are shown onmap; measurements for other structures are omitted, but are available in digitalform on request. Symbols are offset in position from exposure locations.

SYMBOLS

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GOVERNMENT OFNEWFOUNDLANDAND LABRADOR

Department ofMines and Energy

Geological Survey

MAP 2001-38OPEN FILE 002E/05/1160

GEOLOGY OF PART OF THEROBERT'S ARM MAP AREA (NTS 2E/5),

WESTERN NOTRE DAME BAY

0 1 2 3 4 5

kilometres

Scale 1:50 000

Geology by B. H. O’Brien, 1990; B. H. O’Brien and D. L. MacDonald, 1996; B. H. O’Brien,and M. E. Rees,1997; B. H. O’Brien and B. McConnell, 1999; B. H. O’Brien, A.Pickett andL. Normore, 2000.

Base map in digital format published by Surveys and Mapping Branch, Natural ResourcesCanada, Ottawa.

Approximate magnetic declination, 1980, at centre of map 26 30' W, decreasing 11.6' annually.

Elevations in metres above sea level.

Universal Transverse Mercator Projection (UTM) Zone 21.

North American Datum (NAD) 1927.

Copies of this map may be obtained from the Geoscience Publications and Information Section,Geological Survey, Department of Mines and Energy, Government of Newfoundland andLabrador, P.O. Box 8700, St. John’s, Newfoundland, Canada A1B 4J6[http://www.geosurv.gov.nf.ca].

This map is subject to revision and modification.

Geological cartography by A. H. Paltanavage.

O’Brien, B. H.2001: Geology of part of the Robert's Arm map area (NTS 2E/5), western Notre Dame Bay.Scale 1:50 000. Newfoundland Department of Mines and Energy, Geological Survey,Map 2001-38, Open File 002E/05/1160.

Recommended Citation

Middle Ordovician - Early Devonian

STRATIFIED AND INTRUSIVE ROCKS OF THE NOTRE DAME SUBZONEEarly to Middle Ordovician

RED INDIAN LINE STRUCTURAL ZONEMiddle Ordovician (?)

HODGES HILL INTRUSIVE COMPLEX

ROBERTS ARM GROUP

SOPS HEAD COMPLEX

TWIN LAKES DIORITEEarly to Late Silurian (?):

CRESCENT LAKE FORMATIONEarly Middle Ordovician (?):

Late Early Ordovician (?):

UNSEPARATED TERRANES/FORMATIONS (of the ROBERTS ARM GROUP)

Early or Middle Ordovician (?):

Late Early Ordovician (?):

Late Early Ordovician (?):

TECTONIZED BLOCK-IN-MATRIX MELANGE UNITMiddle Ordovician to Late Silurian (?):

BROKEN OLISTOSTROMAL UNITSMiddle Ordovician:

Early to Middle Ordovician (?):

Early to Middle Ordovician (?):

Early to Middle Ordovician (?):

Early to Middle Ordovician (?):

Early to Middle Ordovician (?):

UNBROKEN LITHOSTRATIGRAPHIC UNITS

Middle Ordovician (?):

Middle Ordovician (?):

Middle Ordovician (?):

Middle Ordovician (?):

medium-grained leucocratic granodiorite; medium-grained equigranular grey gabbro; minorcoarse-grained hornblende diorite; rare leucogranite veins; posttectonic relative to structures in the Exploits and NotreDame subzones

interbedded bright-red and dark-red chert; maroon, thin-bedded siltstone and siliceouslaminated argillite; light-green, medium-bedded, siliceous sandstone; grey-green, medium- to thick-bedded wacke havingdistinctive jasper, granite and basalt pebbles; sedimentary rocks of units 29 and 30 unseparated

Green sandstone turbidites containing abundant jasper clasts, poorly bedded wacke containing red chert and basaltclasts, and polymictic conglomerate containing conspicuous volcanic and plutonic boulders

Red and grey chert rhythmites interbedded with thin-bedded siliceous argillite and graded grey sandstone

light-green, massive, aphanitic, vesicular basalt; light-green basalt breccia and pillow breccias;dark-green, fine-grained, pyroxene-porphyritic basalt; minor, green and red, variably hematized, pillowed basalt with redchert veins near Tommys Arm river estuary (possible thrust slice of Unit 26); rare interstitial red chert and interflow redargillite; Crescent “terrane” of previous workers

gabbro sills; unseparated diorite sheets

pillow lava and pillow breccia; dark-green, massive, vesicular, variably porphyritic, locally flow-foliated basalt; pillowed basalts containing epidote-rich and hematite-rich zones in concentric bands and as veinlets;variably hematized basalt associated with minor interstitial and interflow red chert

light-grey, massive, quartz-phyric felsite; buff to pink, felsic crystal tuff having eutaxitic quartzgrains; variably chloritized, felsic lithic tuff (locally containing silicified rock fragments); felsic breccia and subordinatebasalt blocks; minor quartz-feldspar porphyry

dark-grey melange dominated by small polylithic blocks having internal foliations orinternal folds; platey, pyrite-rich, black phyllite or pelitic schist (locally forming the matrix of the melange belt orrepresenting an original mudstone-bearing map unit); minor porphyroclastic schist derived from semi-psammite andmetabasite; minor red-matrix melange derived from hematitic basalt and protomylonite; minor green-matrix melangederived from chloritic basalt and cataclastite

Sparry Limestone– conodont-bearing limestone in stratigraphic contact with various basalt types indiscrete volcanic blocks; limestone beds forming solitary carbonate megablocks and smaller olistoliths in melange;limestone clasts resedimented along with monolithic basalt clasts in alternating muddy and calcareous debrites; bandedmarble interstratified or tectonically interlayered with pyritic black argillite. Similar lithodemes within large limestone clastsin Unit 10. Also, in the basal Moores Cove Formation of the Cottrells Cove Group, the Hummock Island Limestone of theExploits Group, and the Cutwell Group on Long Island

Basalt Flows– internally-fractured, marginally-shattered epidotized basalt (injected by greenepiclastic wacke - itself impregnated with black mudstone); massive, light-green, fine-grained, silicified basalt (indepositional contact with siliciclastic and calcareous sedimentary strata within map-scale blocks); pillow breccia andhematized basalt (resedimented with jasper and chert in red siliceous debrite); minor olistoliths of basalt breccia (chilledagainst mudstone) in a matrix of fractured volcaniclastic wacke; the above rocks are seen in the dominantly sand-matrixdebrite belts. The dominantly mud-matrix debrite belts display light-green and dark-grey aphanitic basalt (injected by blackmudstone) and porphyritic vesicular basalt (augened by featureless black mudstone, or wrapped by partially brokeninterbeds of pyritic black argillite and dark-grey laminated siltstone, or partly enclosed by black pebbly mudstone). Similarlithodemes in Unit 16. Also, in the Pennys Brook Formation of the Wild Bight Group and the Crescent Lake Formation ofthe Roberts Arm Group

Mottled Turbidite and Variegated Chert– green and grey, parallel- and cross-laminated,rhythmically interbedded, siliceous turbidites having mottled and nodular texture (forming mottled olistoliths withinunmottled pebbly mudstone). Minor red, green and grey chert interbedded with laminated siliceous argillite. Similarlithodemes in units 14 and 17

Polymictic Conglomerate– thickly stratified, poorly sorted, graded conglomerate beds withdistinctive basalt, limestone and granite boulders (partly or completely enclosed by chaotically deformed sandy debrite);small, massive, buff-weathered conglomerate blocks (within muddy debrites); conglomeratic turbidite lenticles (preservingerosive bases above black pyritic argillite and channels within interstratified sandstone turbidites). Similar unbrokenlithodemes in Unit 10

Black Argillite - Pebbly Mudstone– sulphidic pebbly mudstone (showing in-situ

Massive Wacke– buff-weathered, massive, granular wacke completely or partiallysurrounding polylithic blocks in debrites; minor, partially disaggregated interbeds of light-grey wacke and dark-greyargillite. Unbroken successions of similar wacke (interstratified with thin-bedded sandstone and siltstone) may occur inUnit 8

[Wild Bight Group / Exploits Group / Roberts Arm Group / Cottrells Cove Group]interbedded, red and green chert; deep-red and bright-red, thin-bedded, laminated argillite; green

and grey, medium-bedded, fine-grained, siliceous, sandstone turbidite. In places, Unit 17 is interlayered with Unit 16 orstratigraphically overlies Unit 16. Similar lithodemes occur in the lower Crescent Lake Formation of the Roberts ArmGroup, the lower Moores Cove Formation of the Cottrells Cove Group, the lower Strong Island Chert of the ExploitsGroup, and the lower Shoal Arm Formation (as well as in Late Cambrian(?) to Middle Ordovician units such as the OmegaPoint Formation of the Wild Bight Group and the Saunders Cove Formation of the Exploits Group)

light-green, variably porphyritic, basalt flows; massive, poorly stratified and well-graded basaltbreccias; minor flow-foliated vesicular basalt; rare pillow breccia with epiclastic or calcareous cement; rare, grey aphanitic,mafic to intermediate, volcanic flows

thinly bedded, grey, banded, microcrystalline chert interstratified with sulphidic and siliceous, blackargillite; minor, buff-weathered, light-grey, net-veined and recrystallized chert; these rocks are interlayered with Unit 14 orstratigraphically overlie Unit 14

mottled, green and grey, parallel- and cross-laminated, siliceous turbidites; nodular, fine-grained,thin-bedded, graded sandstone containing mud microflakes and sandstone dykelets; rhythmic interbeds of dark-greencherty siltstone and dark-grey banded argillite. Unit 14 underlies and also overlies Unit 16 and is in depositional contactwith units 9 and 10; similar lithodemes are present in the upper Pennys Brook Formation of the Wild Bight Group, thelower Shoal Arm Formation, and the upper New Bay Formation of the Exploits Group

fragmentationof slumped grey siltstone and black argillite beds); basalt block-in-argillite within conglomerate block-in-argillite withinpebbly mudstone or sandy debrite; stratiform intervals of coherently-bedded black argillite (forming a substrate, devoid ofchert, to basalt or conglomerate sequences). Similar unbroken lithodemes in Unit 9.

BADGER GROUP (Unit 13)

EXPLOITS GROUP

WILD BIGHT GROUP

SOUTH LAKE IGNEOUS COMPLEX

STRATIFIED AND INTRUSIVE ROCKS OF THE EXPLOITS SUBZONELate Ordovician

Middle and Late Ordovician (?)

Middle Ordovician (?)

Late Cambrian (?) to Middle Ordovician

Cambro-Ordovician

GULL ISLAND FORMATIONEarly Late Ordovician:

SHOAL ARM FORMATIONLate Middle Ordovician to Early Late Ordovician (?):

GUMMY BROOK GABBRO

NEW BAY FORMATIONLate Early Ordovician:

Late Early Ordovician (?):

Late Early Ordovician (?):

PENNYS BROOK FORMATIONEarly Middle to Late Middle Ordovician:

SPARROW COVE FORMATIONEarly to Middle Ordovician (?):

SIDE HARBOUR (?) BASALT UNITEarly to Middle Ordovician (?):

BANDED GREY ARGILLITE UNITEarly to Middle Ordovician (?):

OMEGA POINT FORMATIONEarly to Middle Ordovician (?):

GLOVERS HARBOUR FORMATIONLate Cambrian (?) to Early Ordovician:

Late Cambrian (?) to Early Ordovician:

predominantly massive, quartz-rich granular to pebbly wacke; minor thin- and thick-bedded, light-grey sandstone turbidites; rare olistostrome along southwest margin of unit; rare cobble conglomerate (with fossiliferouslimestone clasts) along northwest margin of unit

black graptolitic slate interstratified with very thin beds of pyriticcarbonaceous siltstone and dark-grey siliceous argillite; light-grey bioturbated chert containing rare black shalepartings; light-grey, thin-bedded to laminated, silicified wacke interbedded with green siliceous argillite and irregularly-mottled sandstone; red radiolarian chert, red laminated argillite and red siliceous siltstone containing slump-foldednodules; maroon and green siltstone rhythmites (containing pyrolusite-bearing horizons) interbedded with turquoise chert

Medium-grained equigranular gabbro sills; minor dark-grey diorite sheets; coarse-grained glomeracrystic gabbro anddiabase (in places cutting epidotized and saussuritized gabbro); pretectonic relative to structures in the Exploits Subzone

polymictic, cobble-to-boulder, clast-supported conglomerate with well-rounded siliciclastic,calcareous and magmatic clasts; massive, light-grey pebbly wacke; depositional contacts with Unit 8 and Unit 9. Similarlithodemes are also presently assigned to the upper Moores Cove Formation of the Cottrells Cove Group and the upperCrescent Lake Formation of the Roberts Arm Group

dark-grey and black, laminated and siliceous, siltstone turbidites; black, pyritic argillite or pyriticslate; minor, light-green, slump-folded sandstone with interbedded or chaotically mixed mudstone

thin interbeds of light green sandstone and dark grey siltstone; minor, light grey, medium-bedded granular wacke; rare, dark-grey and black sulphidic argillite; all rocks are siliceous and highly indurated

thin-bedded, green and grey, variably mottled, concretionary turbidites; thin-and thick-bedded, grey-green sandstone containing imbricated rip-up clasts of slump-folded banded argillite grading toparallel-laminated sandstone; thickly stratified, dark-green, tuffaceous wacke with predominant vesicular basalt andsubordinate intermediate to felsic volcanic clasts; massive to thickly bedded epiclastic wacke (and associated debrites)with mixed sedimentary and volcanic clasts; minor pebbly wacke containing distinctive jasper and red argillite clasts.laterally discontinuous lenticles of pillow lava, pillow breccia and massive vesicular basalt breccia; associated sand-matrixolistostromes and chaotically-slumped mixtites with various volcanic and sedimentary intraclasts

dark-green, porphyritic pillow lava with some interstitial variegated chert; subordinate, thin-bedded, light-green, graded sandstone and light-grey, parallel-laminated argillite interstratified with vesicular basalt flows;minor gabbro sills, rare tuff beds and rip-up clasts of tuffaceous wacke

pillow lava, pillow breccia, minor chert and turbiditein the Side Harbour Pond area, pillow lava associated with jasper-bearing chert and siliceous red argillite; siliceous,

hematite-rich vesicular basalt; minor, maroon siltstone lenses intercalated with amygdaloidal basalt flows [possiblyOmega Point Formation?]. in the Seal Bay Bottom area, green vesicular pillow lava transitional to red pillow lavacontaining jasper disseminations; hematite-rich pillow breccia with interstitial red chert; collapsed, slumped and variablydisaggregated pillowed basalt in sand-matrix debrite; minor gabbro sills; rare green laminated sandstone and red siliceousargillite [possibly lower Omega Point Formation? or upper Glovers Harbour Formation?]. in the upper Seal Bay Brookarea, hematite-, epidote- and chlorite-bearing pillowed basalt, vesicular pillow lava having jasper disseminations; red andgreen basalt breccia, in places, grading to fine-grained mafic tuff; local zones of highly discoidal pillow breccia withinterstitial red chert; minor jasper-bearing chert and maroon argillite interbeds; rare diorite sills [possibly Omega PointFormation? or, alternatively, upper Pennys Brook Formation?]

in the Little Lewis Lake area, thin interbeds of dark-grey shale and light-grey siltstone,laminated and banded siliceous grey argillite, carbonaceous dark-grey slate; minor debrite dominated by varioussedimentary blocks. In the Seal Bay Brook - Big Lewis Lake area, mostly debrite having banded argillite blocks andaltered volcanic blocks [possibly uncommonly thick part of Omega Point Formation?]

red, massive to thickly stratified, poorly sorted gravel beds with subrounded cobblesand boulders of hematized volcanic and intrusive rocks; chaotically-slumped debrite and red conglomeratic wacke; redchert, red siliceous argillite and hematitic banded iron formation; interbedded, red and green, parallel- and cross-laminated siltstone turbidites (having spotted pseudoporphyroblasts in places); dark grey carbonaceous shale; light grey,thickly stratified, polymictic, conglomeratic turbidite. in the Long Pond area, pillowed basalt flows interstratified withred chert, red siliceous argillite, maroon siltstone and grey-green wacke [possibly Side Harbour Basalt?]

interstratified rhyolite and basalt; minor felsic porphyry and diabase

dominantly felsic intrusive and volcanic rocks of the Long Pond area: hematite-rich quartz-feldspar porphyry (locallyinjected by red chert veinlets); light-grey rhyolite breccia and pyritic felsic tuff; rare, purplish-red rhyolite dykes.dominantly mafic volcanic rocks of the Long Pond area: dark green pillow breccia and light-green basalt flows; minormixed mafic–felsic volcanic breccia

dominantly mafic volcanic rocks of the Little Lewis Lake area: red basalt breccia containing disseminated jasper,green vesicular basalt with pyritic quartz stringers; minor slump-folded grey argillite (partially enclosing mafic volcanicblocks)

dominantly felsic volcanic rocks of the Kerry Lake–Nanny Bag Lake area: light-grey, well-banded, flow-folded rhyoliteintruded by diabase dykes; minor basalt flows. dominantly mafic volcanic rocks of the Kerry Lake–Nanny Bag Lakearea: dark-green chloritic pillowed basalt, light-green, epidote-rich, pyritic, net-veined basalt; minor, variegated, red andgreen, vesicular pillow lava

dominantly mafic volcanic rocks of the Big Lewis Lake–New Bay Pond area: massive, dark-grey and dark-greenbasalt flows; minor pillow breccia grading to tuffaceous wacke; rare mafic tectonite. unseparated mafic and felsicvolcanic rocks of the Big Lewis Lake–New Bay Pond area: light-green siliceous basalt breccia, dark-green pyritic basaltflows, felsic–mafic crystal lithic tuff; minor debrite with banded argillite and siliceous basalt blocks

dominantly felsic volcanic rocks of the Indian Cove - Corner Point area: purplish-red rhyolite breccia and hematiticflow-banded rhyolite; light-grey, pyritic, rhyolite-dominant volcanic breccia; mixed mafic–felsic volcanic breccia (havingoutsized basalt bombs and silicified flow-banded rhyolite blocks); minor, light-green, quartz-phyric crystal tuff; minorquartz-feldspar porphyry; rare, purplish-red rhyolite dykes. dominantly mafic volcanic rocks of the Indian Cove -Corner Point area: dark-green pillowed basalt, light-green basalt breccia; minor diorite and diabase

unseparated mafic and felsic plutonic rocks, including layered gabbro (havingswarms of sheeted mafic dykes); flaser-banded metagabbro (in places, hosting small gossan zones); medium-grained,locally pyritic, blue-quartz tonalite (containing metagabbro enclaves); minor hornblende diorite and gabbro pegmatite

12a:12b:

12c:

7a:

7b:

5a:

5b:

5c:

3a:

3b:

2a-f:2a-m:

2b-m:

2c-f:2c-m:

2d-m:2d-fm:

2e-f:

2e-m:

32

31

30

29

28

27

26

25

24

23

22

21

20

19

18

17

16

15

14

13

12

11

10

9

8

7a

7b

6

5

4

3b

3a

2

2a-f

2a-m

2b-m

2c-f

2c-m

2d-m

2d-fm

2e-f

2e-m

1

LEGEND