P `JBAIR PUBLICATIONS COMPACTUS

(LENDING sEcnom

DEPARTMENT OFNATIONAL RESOURCES

BUREAU OF MINERAL RESOURCES,GEOLOGY AND GEOPHYSICS

Record 1977/44^055856

,

CATALOGUE OF FIUD COMPILATION SHMTS OF THE

NEWCASTLE RANGE VOLCANICS- AND ASSOCIATED ROCKS

IN THE MOUNT SURPRISE, GALLOWAY AND NORTHERNMOST

GEORGETOWN 1:100 000 SHEET AREAS

by

B.S. Oversby

The information contained in this report has been obtained by the Department of National Resources-- -art of the policy of the Australian Government to assist in the exploration and development of

31 resources. It may not be published in any form or used in a company prospectus or statementit the permission in writing of the Director, Bureau of Mineral Resources, Geology and Geophysics.

BMRRecord1977/44

c.3

Record 1977/44

CATALOGUE OF FIELD COMPILATION SHOTS OF THE

NEWCASTLE RANGE VOLCANICS AND ASSOCIATED ROCKS

IN THE MOuNT SURPRISE, GALLOWAY AND NORTHERNMOST

GEORGETOWN 11100 000 SHEET AREAS

by

B.S. Oversby

Catalogue of field compilation sheets of the. Newcastle Range Volcanics and associated rocks in the Mount Surprise, Galloway, - and northernmost

Georgetown 1:100 000 Sheet areas

The geological maps which are reproduced here at about 1:100 000

scale have been compiled directly from basic field data and supplementary

photo ,-interpretation recorded on overlays to 1:25 000 Capprox.) scale

colour air photographs. The numbers of the photographs whose overlays

have been used in this compilation are noted in the left-hand margins of

the maps. Because of their preliminary nature, the maps will probably be

revised from time to time as study of the Newcastle Range volcanics

progresses; hopefully, any such revisions will only be relatively minor.

The fieldwork on which these maps are based was undertaken as partof the joint Bureau of Mineral Resources (BMR) - Geological Survey of

Queensland (GSQ) Georgetown Project. Work was aimed specifically at

completing coverage of the Newcastle Range Volcanics and closely associated

Upper Palaeozoic rocks, the main outcrop areas of which had previously

been examined during semi-detailed regional mapping in the Forsayth and

Georgetown 1:100 000 Sheet areas CFig. 1) CBain, and others, 1976;

Oversby, and others, in prep:). Map symbols CFigs. 2a, 2b) and rock

unit notations (Figs 3, 4) used on the Preliminary Editions of the

Forsayth and Georgetown 1:100 000 Geological Series maps CBMR, 1975

and 1976 respectively) have been retained as far as practicable or desi-

rable.

Most of the fieldwork in the Mount Surprise Sheet area was done

during September 1975; a small part of the Galloway Sheet area was mapped

at about the same time, but most of that area was studied during late

June and early September 1976. The work in the Galloway Sheet area showed

up inadequacies in the then-current geological picture of the Newcastle

Range in the northernmost part of the Georgetown 1:100 000 Sheet area

(as shown on the appropriate Preliminary Edition of the Geological

Series map - BMR, 1976), which had originally been mapped during the

1974 field season. Consequently, the area was remapped during September

and October 1976. Some data collected during 1:250 000-scale reconnaissance

mapping of relevant areas (see Branch, 1966; Smart & Bain, 1976) have

also been incorporated in the maps.

- 2-

The revisions made in the northernmost Georgetown Sheet area

will be included in the proposed First Edition of that 1:100 000 Geological

Series map, but the other two areas will not be shown on standard maps

in the foreseeable future. However, it is hoped to eventually produce a

special map showing the geology of the whole Newcastle Range as a single

entity.

The basic data accumulated during fieldwork (notes, annotated

photo-overlays, hand specimens, thin sections, etc.) are housed in the

Bureau of Mineral Resources, Canberra, and can be examined there.

Copies of these maps at their original 1:25 000 Capprox.)

scale can be obtained from - The Copy Service, Commonwealth Government

Printer (Production),:P.O. Box 84, Canberra,,A.C.T.^2600: price

on application. Comments on the usefulness, or otherwise, of the

maps would be appreciated by the author, as would notification of errors,

omissions, and any additional data and interpretations which might

increase geological understanding of the Newcastle Range Volcanics.

Acknowledgements

I am indebted to Georgetown Project co-workers John Bain

(Project Leader), Ian Withnall, and Max Baker (both GSQ) for encouragement

to continue work in the Newcastle Range beyond the boundaries of

systematically mapped sheet areas. The encouragement of company geologists

involved with the areas mapped is also appreciated. Fieldwork would have

been virtually impossible without the help of numerous people, notably

field hands Kjell Ellingsen, Gary Ferrie, Alan Hoey, Clair Jolliffe,

Jim Pollard, and Robin Wills. The maps were drawn by Peter Blythe, Phil

Jorritsma, and Joe Mifsud of the BMR Geological Drawing Office.

-3-

References

BAIN,:J.14C.,'WITHNALL :I.W, and OVERSBY B.S.,'1976 - Geology of the

Forsayth 1:100 000 Sheet area C7660), north Queensland. Bureau

of Mineral Resources, Australia, Record 1976/4 (unpublished).

BMR, 1975 - Forsayth, Queensland - 1:100 000 Geological Series.

Bureau of Mineral Resources, Australia, Sheet 7660 CPreliminary

Edition).

BMR, 1976 - Georgetown, Queensland - 1:100 000 Geological Series.

Bureau of Mineral Resources, Australia, Sheet 7661 CPreliminary

Edition).

BRANCH, C.D.,1966 - Volcanic cauldrons, ring complexes, and associatedgranites of the Georgetown Inlier, Queensland. Bureau of Mineral

Resources, Australia, Bulletin 76.

SMART, J.,'and BAIN, J.H.C., 1976 - Red River, Queensland - 1:250 000

Geological Series. Bureau of Mineral Resources, Australia

Explanatory Notes SE/54-8.

AIHN4DONDOWNS7562

FORESTROME7561

NORTHHEAD7560

wurrwirf LY1IDOROOK I7662^7762

NEWCASTVOLCAti

MOUNTSURPRISE

7761

ElkLASLEICE7760

FORSAYTH

NE RACEICS

Fig. I Location of the outcrop area of Newcastle Range Vo!conics in relotion to1:100 000 sheet areas. Diagonal shading denotes those parts of the out-crop area shown on the enclosed field compilation sheets

Record 1977/44^ E54/Al2/46

/ 26 Strike and dip of strata.

/43^Dip <5'

Dip 5*- 15'

Dip 15*-45Air photo

•Dip >45^ inEerpretoFion

Horizontal strata

Trend lines

Joint pattern

Lineament

Strike and dip of eutaritic foliation in iynimbrite

Dyke with dip, measured, interpreted from air photo

Vertical dyke

D9kes are annotated according to rock type(queried where uncertain): rh=rhyolite; mg,=porphyrilic microyranite; aplv aplite; da = dacite

Location of rock sampled car isotopic aiye. determination

®^Location of recorded field observation

iE^Abandoned prospectSn . tin (toss teri te ); Pb. lead (salena)

X^Abandoned alluvial workin9s

•Ch^Minor mineral occurrence: Ch= chalcopyrite; Fl. fluorite.

41—efio—e.

etealclical laoundar. 9 .,

Fault (o,u indicate relative movement clown, up)

Anticline

Siincline

Where location of boundaries, Faults, and Folds isapproximate, line is broken; where iriFerrad, queried;Where concealed, boundaries and Folds are dotted,faults ore shown 69 short dashes.

Fig. 2(a) Geological symbols used on the compilation sheetsRecord 1977/44^ E54/412/47

Bore with windpump

Dam

Sprins

River, creek

wl...zr`- Major waterhoie, small, lar9e

Major waterFall

=^Minor road, vehicle track

•^Building

o^Yard

Telephone line

tz .r.^Landin9 9round

'QM" Summit

re'^Position approximate

Note: some topo9raphic 11ArneS 'tire infOrn161

Fig. 2 (b) Topographic symbols used on the compilation sheetsRecord 1977/44^ E54/Al2/48

McBridevolcanicsi

Qhe

Q

Cz.s

I Czin

Eva CreekMicrogranite

dol

Cnb

I Cns

Cns

Cns.

t--

t.

M9 ,

rh

Cn

Cn4

Cn3

Cn2..

Cn i

MOUNT SURPRISE SHEET AREA

Si I, sand, gravel: active. channel deposits

silt, sand, 9ravel: abandoned and occasiona4active channel deposits

clay, silt, sand: soil andcolltvial deposits

undivided extrusiveolivine basalts

porpliritic biotite microgronite

porphyritic rnicrosrani

aphHric to porphiiritic rhrlite:graes Into micregranite

intrusive.? opin3ric dolerite

.3re rhrlitic isnimbrite with t 5o%phenocrysts about 4uvo across,and hornblendebug rhyolitic isnimbrite with obout 4-0%phenocrysts about 4-min acrossbuff aphyric rhyolitic

/

ignirnbrite?buff to purple r^ibhAjohtic i9nimbrc with aboutas phenocrysts about 2aua across

buff tthelite and microgromite with about 4-0%

phenocrysts up to lcm ocross: may be intrusive

extrusive ophyric basalt and/or a.ndssibt

undivided volcaniclasEic and epiclosticSe dinvonEctry rocks

YOlcaniclastic sedimento9 rocks

epickslic sedimentorl rocks

PROTEROZOIC^

undivided sroraoid and metamorphic rocks

informai nage."

Fig. 3 Key to rock unit notations used on the Mt Surprise compilation sheetsRecord 1977/44^ E54/Al2/49

M5 1

rh

Cn rr

Glom

CnanCna i

Qha

Qa

Lindero. basaltI Qu

I Czs

ElizabethCreek ranite

Cny,

Cnv.

PROTEROZOIC

9

Cnn

Cns

Cas 1

CORgETOWN and OLLOWAY SHEET AREAS

silt, sand , gravel: active clianael deposits

silk, sand, gravel: abandoned and occasionallyactive channel deposits

extrusive olivine bosalt

cloy, silt,Sand: Soil andcolluvial deposits

pink biotite leucairanite; minor rnicrosronite,aplite, greisen

porphyribc. mkrogranite

aphyric to porphgriEic rhgolite: locallygrades into microgranite

inLrusive? volcanic breccia

buff and purple rh9olibk irinnbrite^40 -75%phenocrysts up to Snice acrossgrey and purple rhyolitic isnimbrite with 2.5-40%phenacrysts up to 1.rnm acrosspurple rhyolitic isnirnbrit.e With 30'A phenocripts 2-4rarnacross: k o intensely "kaalinisedpurple. rhyolitic acrlomerato. andagglorneratic ignimbrite

toufF ' rarely purple, rhgolitic ignimbrite and lava,airçatl tufF., and asilomerate

undivided aphuric andesitic lava

aphyric and^porphrilic anctesiticand traciyanclesitic? loyal

porphyritic andesitic lava

aph9ric andesitic lava

VOlcaniclaseic er4imeatar3 rocksand/or airfall tufF

epiclastic sedimentani rocks

. undivided granitoid and metamorphic rocks

inFormol name.^.

this unit designated Cn n on Prelim. Ed. ofCieorgetown 1:100 coo geological Series 5bee 7651

Fig.4 Key to rock unit'notations used on the Galloway and Georgetowncompilation sheets

^

Record 1977/44^ E 54/Al2/50

9.

RUN II •GALLOWAY 2238,2240,

22+2,2244

kn.Or.

l

/4330' 144• oo'17%30'

I 5 Km (approx.)

gALLOWAY(7662)

BMR Record 1977/4-4- - Compilation Sheet 1

INN^MI MI IMO MI OM MN MO NO MI^111111 MIS 111111^MI INN 11111

Mapped (1476) by B.S.Oversby (MR)Drawn by P.T. Torritsma and

I Mipud (BMR)

E54/Al2/39

MO SIMI MO INS MN MO MO MI MI MI IMO SW MS FM UM NMI MO a as ONO

/ 4)

N.^,^E^)^

7/4^C:\

Ls^E^ '^•^ !

y -7-- 5^\

)

(^ Pr-^%

' ''N^V 17

^

? '''^\• \ N

^

'—■ /\^ \

/^?'S\.(E^\ 4r,. /

^

/^----.----

^) —C.^--s-N.^i^...

1. : •^ .._.

I _) \

RUN 12GALLOWAY 2276.2278.1180

RUN 13GALLOWAY 2248,1250

18°00

14.8 . 30' 144. 001^17 . 30'

4ALLOWY(7662)

Mapped (1475, Ictu) by B.-S. Oversby (BMR)Drown by PI Torritsma and

7. MiCsud (BMR)

o 4^5 Km (approx.)^4

is•oot

BMR Record 1977/44- Compilation Sheet 2 E5 4/Al2/40

MI MI NM MN MI MIN INS INN NM MI MI INN MIN MI VIM MINI MI^INIII

1430 30 8^144. 001^ 11 • 30'30'

0^2^3^1-^p Km (approx.)• Mapped (1q76) by 5.5. OVersby (BMA)Drawn 616 P.S. Jorritsrna and

MiCsud (BMR)

^t8'00'LLOWAY(7662)

BMR Record 1977/44- Compilation Sheet 3E 54 /Al2 /41

1

143'30 °

5 Km (approx.)

BMR Record 1977/44 - Compilation SheeL 4

111111^IMI1^111111 MI UM MIS MIMI 11111 VIII INN 1111111^1111111 1111111 NM MI MB MI

Plopped (Pr) by B.S. Overs))4 (8MR)Drawn bi.j P.31 Torritsrria.o.nd

S. MiFsud (BMR)

E54/Al2/42

143.30'

4 ^5 Km (approx.)

11130'

GEOR4ETOWti(7661)

BMR Record 1977/44- Compilation Sheet 5

MS^1=1 1111111 MI III INS MN 1116 ND MI III Ell MI MN IMO NO ma No

Mapped (1974,1974) by B.S. Oversby (BMR)

Drawn by ?.L. Blythe (BYIR)

E 54/Al2 /43

144•00'^l4t°30 1nroo'

18 30'

o 2 1 Km (approx.)Mailed (4747 ) C175 11 B.S. Oversby (BrIR)

Drawn by P.I. Jorritsmo. andMiPsua (B1111)

MOUNTSURPAISE

(7760

MR Record I ci 77 / 44- Compilation Sheet. 6^

E5 4/M2/4 4

Sr ffirassnos itat.MIA WO

1 1.1W 11seessa now 1.1.1.•

C

' 'ret /17-

Ise ...Wel 046, WMWow rell■ P.

CM

t''''^..,

...-/Oa^r

'I a5.11 ()(Ca—‘LCat 3:47,44;&—"r\t\tleaa, Cil.

\I1^it'

)-^j

4."^e^■

s N.

Ohs

144° oo^144•30'10 00'

le3o 1

INS NMI NINII MS NM INN NM MN NMI VIII INN^ 1111111 MN FM/ NON NMI MINN

Cns.

Mapped (1,17s) hs B.S.Oversh3 (MIR)o^3^4^5 Km (approx.)^Drawn bs P.I.Jorritsma and

J. HIFSUd (BMR)

MOUNTSURPRISE

(776I)

BtIR Record 1977/44- - Compilation Sheet 7^

E54/Al2/45