SITE 7 4 5 HOLE A CORE 1H CORED INTERVAL 0 . 5 - 9 . 5 mbsf 745A-1H
0 0
GRAPHICLITHOLOGY
LITHOLOGIC DESCRIPTION
DIATOM OOZE
Major lithology: Diatom ooze with minor silt, burrowed and mottled and with
(5G 5/2), uαm y •ciy V uiinαiucu I U I o/ i^, i ILJ 11 L LJI cay ^ ui n lαincu IU I D; I t
5GY 6/1), pale olive (5Y 6/3) and also brown ("unnamed" 2.5Y 5/3) in color. Grairsizes are estimated to be 1 % sand, 83% silt, 16% clay. The laminae haveslightly higher percentages of the terrigenous detritus (15-30%) (Section 1, 98;Section 2, 48, 67-68 cm; Section 3, 110, 122 cm). Also dark green (5G 4/2)glauconitic laminae (Section 1, 130 cm; Section 2, 80 cm; Section 6, 85, 90, 95,103 cm).
Drilling disturbance:Upper parts have soupy deformation, and throughout the core, the minorlaminae are bowed.
SMEAR SLIDE SUMMARY (%):
1,47 1,100 1,130 2,66
SandSiltClay
COMPOSITION:
ClayDiatomsFeldsparNannofossilsPyroxeneQuartzRadiolarians
4, 3M
oo SITE 745 HOLE B CORE 1H CORED INTERVAL 0.0-5.0 mbsfBIOSTRAT. ZONE/
UTHOLOGIC DESCRIPTION
DIATOM OOZE
Major lithology:Diatom ooze, homogeneous apart from occasional burrows, mottles andlaminae, in colors pale brown ("unnamed" 2.5Y 6/3, "unnamed" 2.5Y 4/3;Section 1), grayish brown (2.5Y 5/2), dark greenish gray (5G 4/1, 5G 3/1; Section2), dark gray ("unnamed" 10Y 4/1; Sections 3, 4, CC). Contains darker gray(5G 3/1) laminae (Section 2, 16, 120, 129 cm; Section 3, 40, 66, 96, 103, 120 cm)and also paler ("unnamed" 2.5Y 6/3) and darker ("unnamed" 2.5Y 4/3) mottles.Several open (void) burrows up to 1 cm diameter exist at Section 3, 10-100 cmand in Section 4.
Drilling disturbance:This shows as soupy deformation in Section 1, and bowed laminaethroughout.
SMEAR SLIDE SUMMARY (%):
2, 63 3, 67
TEXTURE:
SandSiltClay
COMPOSITION:
AmphiboleDiatomsFeldsparGlassQuartzRadiolariansSilicoflagellatesSpicules
1, 100D
18316
_807
—10TrTr—
SITE 7 4 5 HOLE B CORE 2H CORED INTERVAL 5 . 0 - 1 4 . 5 745B-2H
BIOSTRAT. ZONE/H FOSSIL CHARACTER
GRAPHICLITHOLOGY LITHOLOGIC DESCRIPTION
DIATOM OOZE
Major lithology:Diatom ooze, locally with minor radiolarians or clay. Colors rangetransitionally through light olive gray (5Y 6/2), pale olive (5Y 6/3), gray (5Y 5/1),dark gray ( 5Y 4/1), olive gray (5Y 4/2, 5Y 5/2) and olive (5Y 5/3). There is weakbioturbation in places and some mottling. Sharply and weakly definedgreenish ("unnamed" 10Y 4/2) and dark gray (5Y 4/1) layers a few mm to cmthick occur in Sections 3-7. A pale olive (5Y 6/3) diagenetic band occurs inSection 5, 64 cm.
Minor lithology:Radiolarian diatom ooze with i1, 0-40 cm.
linor clay, gray (5Y 5/1), homogeneous, Section
Minor silt grains of quartz and feldspar occur throughout.
SMEAR SLIDE SUMMARY (%):
TEXTURE:
SandSiltClay
COMPOSITION:
Access. MineralsAmphiboleClayDiatomsFeldsparForaminifersGlassOpaquesQuartzRadiolariansSilicoflagellatesSpicules
1, 20D
107515
TrTr15503
—Tr15
25Tr
—
1, 80D
50455
_Tr5
80Tr—TrTr571
Tr
2,80D
306010
TrTr3
80TrTr—13
102
Tr
7, 10D
107515
TrTr15704
——155
——
7,50M
_—-
TrTr10702
—_555TrTr
SITE 745 HOLE CORE 3H CORED INTERVAL 14.5-24.0 mbsfBIOSTRAT. ZONE/
GRAPHICLITHOLOGY
. r
i
LITHOLOGIC DESCRIPTION
DIATOM OOZE
Major lithology: Diatom ooze, locally with minor radiolarians (Sections 1 and 3)or quartz-feldspar silt (Section 2). Colors range transitionally through gray(5Y 5/1), dark gray (5Y 4/1) and olive gray (5Y 5/2). Sharp and weakly defineddark gray (5Y 4/1) and olive gray (5Y 5/2) layers and color bands in a mm- tocm-scale occur in Sections 1-6.
Drilling disturbance:The upper part of the core is very disturbed and soupy, the minor laminae arebowed.
SMEAR SLIDE SUMMARY (%):
TEXTURE:
SandSiltClay
COMPOSITION:
Access. MineralsAmphiboleClayDiatomsFeldsparGlassOpaquesQuartzRadiolariansSilicoflagellatesSpicules
355510
Tr15
80311331
Tr
1,80D
2,80 3,80 6,80
m
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4H CORED INTERVAL 2 4 . 0 - 3 3 . 5 mDsf
GRAPHIC
LITHOLOGY
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LITH0L0GIC DESCRIPTION
DIATOM OOZE
Major lithology:Diatom ooze, varying in color through dark gray (5Y 4/1), gray (5Y 5/1) and olivegray (5Y 5/2). The sediment is characterized by smoother and rougher texturedzones, but smear slides show little compositional differences. Minor laminatedintervals, both diffusely and sharply defined, and partly diagenetic occurthroughout, some are inclined and resemble liesegang rings (e.g., Section 3,50 cm); they have diffuse tops and sharp bases. They are olive green (5Y 5/2)and dark gray (5Y 4/1). In Section 4, 103 cm is a thin layer of dark greenishgray (5GY 4/1) hard clay.
The sediment is homogeneous to weakly bioturbated. Open tube-like featuresoccur in Section 2, 85 cm and 121 cm, and Section 3, 40 cm, 71 cm and 77 cm.They are probably burrows. They are coated on the inside with soft gray mud,and are surrounded by a greenish halo.
Manganese oxide smears are developed in places.
Quartz and feldspar grains are disseminated throughout, and in Section 5,122 cm is an 8 mm diameter pebble of amphibolite.
SMEAR SLIDE SUMMARY (%):
1, 90 2, 100 2, 148 3, 25D D M D
TEXTURE:
Sand 10 10 — 10Silt 80 75 80 65Clay 10 15 20 25
COMPOSITION:
Clay 5 15 50 25Diatoms 84 73 30 50Feldspar — — — 5Glass — — — TrOpaques Tr Tr 10 2Quartz — 7 — 10Radiolarians 10 5 10 5Silicoflagellates 1 Tr Tr 1Spicules — — — Tr
SMTE
I
745 HOLE B CORE 5H CORED INTERVAL 33.5-43.0 mbSfBIOSTRAT. ZONE/FOSSIL CHARACTER
in to
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745B-5H
LITHOLOGIC DESCRIPTION
DIATOM OOZE
Major lithologies:a. Diatom ooze, varying in color through dark gray (5Y 4/1),and gray (5Y 5/1,
5Y 6/1).b. Diatom ooze with minor clay, quartz and feldspar silt, dark gray (5Y 4/1) and
grey (5Y 5/1), smoother textured than diatom ooze with which it alternates,reflecting higher clay content.
Minor laminated intervals, both diffusely and sharply defined, and partlydiagenetic occur throughout diatom ooze and diatom ooze withminor clay,quartz and feldspar. They are olive green (5Y 5/2), dark gray (5Y 4/1) and verydark gray (10YR 3/1).
Black (5Y 2.5/1) smears and mottles of various colors occur in many parts ofthe core. Minor bioturbation is also evident.
Minor lithology:Diatom clay with minor quartz, dark green and compacted, occurs as sub-cmthick layers in Section 3, 130-132 cm, Section 4, 120 cm and Section 5, 40 cm.
Disseminated silt occurs throughout.
Drilling disturbance:A 3 cm faulted offset in Section 2, 90-130 cm is a result of drilling disturbance,the fault plane being smeared with ooze from drilling.
SMEAR SLIDE SUMMARY (%):
TEXTURE:
SandSiltClay
COMPOSITION:
AmphiboleClayDiatomsFeldsparOpaquesQuartzRadiolariansSilicoflagellates
1, 107D
1085
5
Tr5
80Tr12
10Tr
3, 134M
—
Tr403532
125Tr
6,37D
105530
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1552
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6H CORED INTERVAL 4 3 . 0 - 5 2 . 3 mbsf
GRAPHICLITH0L0GY
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LITH0L0GIC DESCRIPTION
DIATOMACEOUS SILTY CLAY and CLAY DIATOM OOZE
Major lithology: Variable from diatomaceous silty clay to clay diatom oozewith minor quartz-feldspar silt, dark gray (5Y 4/1) to gray (5Y 5/1). Thesediment is stiff and varies from homogeneous to stratified. Diffuse tosharply defined dark green (5G 4/1) laminae and cm-thick layers occur inplaces, as well as variable dark blotches.
SMEAR SLIDE SUMMARY (%):
1,85 2,100 4,60 6,120D D D D
TEXTURE:
Sand 10 15 10 10Silt 50 50 50 50Clay 40 35 40 40
COMPOSITION:
Access. Minerals Tr Tr Tr TrAmphibole Tr 1 1 1Clay 35 35 40 40Diatoms 40 30 35 45Feldspar 6 10 5 3Glass — 1 1 1Opaques 2 2 1 1Quartz 15 20 10 5Radiolarians — 1 7 1Silicoflagellates Tr — Tr —
8 SITE
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GRAPHIC
LITHOLOGY
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DIATOMACEOUS SILTY CLAY and CLAY DIATOM OOZE
Major lithology: Variable from diatomaceous silty clay to clay diatom ooze ,ooze with minor quartz-feldspar silt, dark gray (5Y 4/1) to gray (5Y5/1). The sediment is stiff and varies from homogeneous to stratified.Diffuse to sharply defined dark green (5G 4/1) laminae and cm-thick layersoccur in places, as well as variable dark blotches.
SMEAR SLIDE SUMMARY (%):
1, 70 2, 75 3, 85 5 115D D D M
TEXTURE:
Sand 30 35 5 35Silt 60 50 45 40Clay 10 15 50 25
COMPOSITION:
Access. Minerals 1 1 1 TrAmphibole 1 Tr — —Clay 10 15 50 20Diatoms 72 70 30 55Feldspar 3 2 3 5Glass 1 — — _Glauconite — — — —
Opaques 1 1 2 5
Quartz 7 8 12 15Radiolarians 3 1 1 —
Silicoflagellates Tr Tr 1 TrSpicules — 1 — —
SITE 745 HOLE B CORE 8H CORED INTERVAL 62.0-71.5 mbsf
B I O S T R Δ T . ZONE/
LITHOL0GIC DESCRIPTION
DIATOM OOZE and SILTY DIATOMACEOUS OOZE
Major lithologies:a. Diatom ooze with minor quartz-feldspar silt and clay; in Section 6 with
minor accessory mineral which may be glauconite. The color varies fromgreenish gray (5GY 5/1), dark gray (5Y 4/1), very dark gray (5Y 3/1), gray (N5/)to light gray (5Y 7/1).
b. Silty diatomaceous ooze with minor clay, greenish gray (5GY 5/1) to darkgreenish gray (5G 4/1).
Both lithologies are weakly bioturbated in places, with burrows, including onefilled with pyrite in Section 5, 33 cm. Color lamination and bedding aredeveloped in places, with thin horizons of dark green (5G 4/2) clay-richsediment, and also dark reddish gray (10R 4/1) laminae. Laminae often have asharp base and a gradational top.
Dispersed granules of quartz and feldspar are disseminated throughout thecore. A 6 mm diameter pebble occurs in Section 2, 68 mm.
SMEAR SLIDE SUMMARY (%):
TEXTURE:
SandSiltClay
COMPOSITION:
Access. MineralsAmphiboleClayDiatomsFeldsparGlassGlauconiteOpaquesQuartzRadiolariansSilicoflagellates
1, 65D
255025
_
Tr204510—
12
20—Tr
3, 69D
36037
_
Tr3065
1—Tr_
11
Tr
3, 69D
305515
_
Tr1070
211185
Tr
6, 61D
37522
_
Tr2570Tr—Tr_
112
6, ID
157015
10Tr8
656
TrTr16
—2
SITE 745 HOLE B CORE 9H CORED INTERVAL 71.5-81.0 mbsf
BIOSTRAT. ZONE/
T
cc
r-
LITHOLOGIC DESCRIPTION
DIATOM OOZE, CLAYEY DIATOM OOZE, DIATOMACEOUS CLAY
Major lithologies:a. Diatom ooze, mainly homogeneous, greenish gray (5GY 6/1, 5G 5/1) and
grayish green (5G 5/2), containing occasional granule and small pebbleloπestones, the larger of granite (Section 1, 134 cm). Also with rare laminaeof greyish green (5G 5/2, 5G 4/2) glauconitic clay (e.g., Section 3, 10-11 cm).
b. Clayey diatom ooze (Section 2, 2-11, 30-78 cm) homogeneous, greenish gray(5G 5/1), with occasional vague and slight color mottling. Also bearing rarelaminae of grayish green (5G 5/2) glauconitic clay (Section 2, 56 cm) anddarker ?Mn stains (Section 2, 56-78 cm).
c. Diatomaceous clay (Section 3, 142-150 cm; Section 4, 0-52, 60-77 cm;Section 5, 60-150 cm; Section 6, 0-10), mostly homogeneous, greenish gray(5GY 5/1, 5G 5/1), with occasional vague layering and mottling.
Drilling disturbance:Some deformation noted in Sections 1 and CC.
SMEAR SLIDE SUMMARY (%):
TEXTURE:
SandSiltClay
COMPOSITION:
AmphiboleClayDiatomsFeldsparGlassGlauconiteOpaquesQuartzRadiolariansSilicoflagellatesSpicules
1,73D
58015
Tr2075
1Tr
—Tr2
—Tr
—
2,48M
28018
Tr2065
5Tr—
17
—Tr
—
2,61D
17722
Tr4052
1TrTrTr221
Tr
4, !M
37720
_
2070
1Tr_
512
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10H CORED INTERVAL 81 .0 -90 .5 mbsf
GRAPHICLITHOLOGY
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LITHOLOGIC DESCRIPTION
CLAYEY DIATOM OOZE, DIATOMACEOUS CLAY
Major lithologies:a. Clayey diatom ooze, mainly homogeneous, gray-green (5GY 5/1, 5GY 6/1),
with occasional laminae of greyish green (5G 5/2) glauconitic clay (Section3, 102 cm; Section 4, 93, 100 cm) and lonestones up to 1.5 cm size (Section1, 51, 119 cm; Section 6, 120 cm).
b. Diatomaceous clay (Section 2, 56-86, 128-137, 147-150 cm; Section 3, 0-97,140-150 cm; Section 4, 16-78, 131-150 cm; Section 5, 0-56, 89-150 cm;Section 6, 0-10, 33-105, 140-150 cm; Section 7, 27-70 cm, Section CC), mainlyhomogeneous, greenish gray (5G 5/1), with occasional lonestones up to
sometimes occurs as laminae within the clayey diatom ooze (Section 6,10-26).
Drilling disturbance:Small amount (2 cm) of soupy material at top of Section 1.
SMEAR SLIDE SUMMARY (%):
2,17 3,88 5,6D D D
TEXTURE:
Sand 2 1 1Silt 78 60 64Clay 20 39 35
COMPOSITION:
Amphibole Tr Tr TrClay 20 40 60Diatoms 65 50 35Feldspar 2 2 1Glass Tr — TrOpaques Tr — TrQuartz 4 3 3Radiolarians 5 3 1Silicoflagellates Tr 1 —Spicules — Tr Tr
7458-10H
SITE 745 HOLE B CORE 11H CORED INTERVAL 90.5-100.0 mbsf
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LITHOLOGY
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LITH0L0GIC DESCRIPTION
DIATOM OOZE
Major lithology:Diatom ooze with minor clay, mainly homogeneous, greenish gray (5GY 5/1,5GY 6/1, 5G 5/1, 5G 4/1) dark olive-gray (5Y 5/1, 5Y 6/1), composed of approx.1% sand, 84% silt, 15% clay. Lonestone pebbles occur in Section 1 (30-93 cm,118-123 cm), Section 2 (130 cm), Section 5 (43 and 97 cm) and Section 6 (50and 61 cm). Vague, slightly darker laminae occur in places (Section 1,121-132 cm; Section 2, 83-100 cm; Section 4, 37 and 82 cm).
Drilling disturbance:Soupy disturbance at the top 13 cm, moderate deformation through Section 1.
SMEAR SLIDE SUMMARY (%):
1, 132 4, 68 7, 13M D D
TEXTURE:
Sand 2 3 7Silt 76 77 78Clay 22 20 15
COMPOSITION:
Amphibole 2 1 1Clay 20 15 10Diatoms 60 70 60Feldspar 3 1 5Glass Tr Tr TrGlauconite Tr — —Nannofossils — 5 —Opaques 1 Tr 1Quartz 7 1 10Radiolarians 4 5 7Silicoflagellates 1 Tr 1Spicules — Tr Tr
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L I T H 0 L 0 G I C DESCRIPTION
CLAYEY DIATOM O O Z E a n d D I A T O M A C E O U S CLAY
Major lithologies:a. Clayey diatom ooze (Section 1, 2), mainly homogeneous, greenish gray
(5G 6/1, 5GY 5/1, 5G 5/1) and grayish green (5G 5/2), with diffuse layeringexpressed in slight changes of color and clay/diatom content (e.g., Section1, 48-72 cm). Some of these are concentrations of glauconite (Section 1,119-130 cm). Grain size textures are approximately 1 % sand, 68% silt, 3 1 %clay,
b. Diatomaceous clay (Sections 3-7, CC), stiff, mainly homogeneous, greenishgray (5G 5/1); contains granules (Section 3, 6, 43-47 cm, 98 cm; Section 5,
Minor lithologies:a. Vitric ash-tuff (Section 2, 99-105 cm), extremely well-sorted, grayish brown
("unnamed" 2.5Y 4/1), with sharp top and base, friable.b. Silt (Section 7, 29-31 cm), gray (5Y 5/1), with sharp base.
SMEAR SLIDE SUMMARY (%):
1, 51 2, 102 7, 30M M M
TEXTURE:
Sand — 50 5Silt 30 50 90Clay 7 0 — 5
COMPOSITION:
Amphibole — — 10Clay 90 — TrDiatoms 5 — 3Feldspar 1 — 2Glass — 85 —Glauconite Tr — TrOpaques 2 1 2Palagonite — — 2Pyroxene — Tr —Quartz 1 10 80Radiolarians — Tr —Spicuies 1 — Tr
800
SITE 7 4 5 HOLE B CORE 13H CORED INTERVAL 1 0 9 . 5 - 1 1 9 . 0 mösf 745B-13H
DIATOMACEOUS CLAY
Major lithology:Diatomaceous clay with minor silt, mainly homogeneous, gray green (5G 6/1,5BG 5/1, 5GY 5/1) to gray (5Y 5/1), with occasional vague layers 1-20 cm thicklayers of varying color. Other layers show sharp upper and/or lowerboundaries. Black-green (5BG 4/1, 5B 4/1) intervals of Mn-micronoduleenrichment also occur in layers 3-10 cm thick (Section 1, 80-83 cm; Section 2,55-65 cm;); other occurrences as mottles (Section 3, 139-150 cm; Section 460-70 cm; Sections 5, 6). Glauconitic layers, <1 cm thick are present (Section1, 22-26 cm; Section 2, 25 and 30 cm; Section 4, 65 cm). A single lonestone ofgray metamorphic lithology occurs at Section 5, 96 cm.
Minor lithology:Silt (Section 119-745B-13H, 3, 133 cm) extremely well-sorted, composed ofquartz, feldspar, broken sponge spicuies and heavy minerals; in a bed 1 cmthick, which has sharp boundaries and internal laminae <0.5 mm thick. Colorsare white and gray-black (N 41).
Drilling disturbance:Suction occurs in Sections 7, CC. Deformed bedding at Section 1, 10-35 cmmay be due to the coring.
SMEAR SLIDE SUMMARY (%):
TEXTURE:
SandSiltClay
COMPOSITION:
AmphiboleClayDiatomsFeldsparOpaquesPalagoniteQuartzRadiolariansSilicoflagellatesSpicuies
1,66D
54550
_503531
_52
Tr1
3, 132M
2908
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34255
1453531
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GRAPHIC
LITHOLOGY
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LITH0L0GIC DESCRIPTION
DIATOMACEOUS CLAY
Major lithology:Diatomaceous clay with minor silt, mainly homogeneous, greenish gray (5G5/1, 5GY 6/1, 5GY 5/1) and olive-gray (5Y 5/1); with occasional laminae andlayers (to 5 cm thick) of glauconite, stiff, pure, deep green (5GY 5/1). Granulesand a 15 mm granite clast occur as lonestones (Sections 3, 4 and 5). Minorvague layering also occurs on a scale of 2-20 cm, expressed in subtle colorvariations and slight changes of clay content.
Minor lithology;
and composed of extremely well-sorted quartz, feldspar, heavy minerals,broken sponge spicules and diatoms; the upper and lower bed boundaries aresharp.
SMEAR SLIDE SUMMARY (%):
2, 36 2, 43 2, 54 3, 145D M M D
TEXTURE:
Sand 2 2 0 2Silt 43 40 90 38Clay 55 58 10 60
COMPOSITION:
Amphibole Tr 2 7 TrClay 55 65 2 60Diatoms 30 15 5 30Feldspar 5 3 10 2Glass Tr — 2 —Glauconite — 3 3 —Opaques 1 — 1 TrPalagonite — Tr — —Quartz 7 7 70 3Radiolarians Tr — — —Silicoflagellatβs Tr — — TrSpicules Tr — — Tr
745B-14H
tfl
SITE 745 HOLE B CORE 1 5H CORED INTERVAL 128.5-138.0 mbsf
BIOSTRAT. ZONE/
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745B-15H.
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LITHOLOGIC DESCRIPTION
DIATOMACEOUS CLAY and CLAYEY DIATOM OOZE
Major lithologies:a. Diatomaceous clay, mainly homogeneous, greenish gray (5G 5/1, 5GY 5/1) or
olive gray (5Y 5/1), stiff, with vague mottles in places (Section 1, 103-113 cm;Section 3, 105-120 cm) and scattered granule lonestones.
b. Clayey diatom ooze, mainly homogeneous, olive-gray (5Y 6/1, 5Y 6/2) orreddish gray (5GY 6/1), weak red (2.5YR 5/2), pale red (2.5YR 6/2), withoccasional mottling (e.g., Section 2, 100 cm) and scattered granulelonestones. A minor variation occurs as a 1 cm thick pale green (5GY 7/1)layer in Section 5 (102-103 cm).
745A16H NO RECOVERY
SITE 741 HOLE CORE 1 7H CORED INTERVAL 139.0-148.5 mbsf
BIOSTRΔT. ZONE/
FOSSIL CHARACTER
cc
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745B-17H 1
LITHOLOGIC DESCRIPTION
CLAYEY DIATOM OOZE and DIATOMACEOUS CLAY
Major lithologies:a. Clayey diatom ooze, gray (5Y 5/1), and minor greenish gray (5G 5/1), brown
(10YR 5/3), weak red (2.5Y 5/2).b. Diatomaceous clay, same colors as clayey diatom ooze. Both the above are
stiff, sticky sediments, interbedded with each other. Minor bioturbationoccurs throughout much of Sections 2, 3, 7 and the lower part of Section 6.Section 2 shows many darker and lighter mottling features and one halostructure. Quartz and feldspar are disseminated throughout most of thecore. Granules occur around every 10 cm. The largest is 5 mm in diameter.
Drilling disturbance:In Section 1 the upper 130 cm are extremely disturbed and soupy. Thesediment shows intensive mottles and different colors. A smaller amount ofdiatom ooze and larger quantities of clay are mixed together.
SMEAR SLIDE SUMMARY (%):
2, 70 4, 100 5, 100
TEXTURE:
SandSiltClay
COMPOSITION:
Access, mineralsAmphiboleClayDiatomsFeldsparGlauconiteOpaquesPalagoniteQuartzRadiolariansSilicoflagellatesSpicules
57025
TrTr
2570
1TrTr—
31
Tr—
53560
Tr—6025
121
Tr351
Tr
26830
Tr—3050
211
Tr10
32
—
SITE 745 HOLE B CORE 1 8H CORED INTERVAL 148.5-158.0 mbsf
H>>I-I-IC-I-I-I-I-r-l-l-l-l
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hi-]'-C-I•i•
LITHOLOGIC DESCRIPTION
CLAYEY DIATOM OOZE and DIATOMACEOUS CLAY
Major lithologies:a. Clayey diatom ooze, gray (5Y 5/1).b. Diatomaceous clay, gray (5Y 5/1, 5Y 6/1).
Both the above are stiff, sticky sediments, interbedded with each other. InSection 5, 100-150 cm the alternations are on a cm-scale. Minor bioturbationoccurs throughout much of the core. Quartz and feldspar are disseminatedthroughout most of the core, including some of granule size. A 3 cm longsubrounded clast of amphibolite occurs in Section 1, 45 cm.
Minor lithology:A quartz-feldspar silt occurs in Section 5, 31-32 cm.
SMEAR SLIDE SUMMARY (%):
6, 80D
TEXTURE:
SandSiltClay
COMPOSITION:
Access. MineralsAmphiboleClayDiatomsFeldsparGlassGlauconiteOpaquesPalagoniteQuartzRadiolariansSilicoflagellates
1, 100D
105040
Tr1
35453Tr121
10i1
5, 31M
10855
Tr72Tr30
1225
50__
SITE 745 HOLE B CORE 19H CORED INTERVAL 1 5 8 . 0 - 1 6 7 . 5 mbsf 745B-19HBIOSTRAT. ZONE/
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LITH0L0GIC DESCRIPTION
DIATOMACEOUS SILTY CLAY, CLAYEY DIATOM OOZE and DIATOMACEOUS CLAY
Major lithologies:a. Diatomaceous silty clay, mainly gray (5Y 5/1) and unnamed ("dark green",
5G 5/8); also greenish gray (5GY 5/1).b. Clayey diatom ooze with minor quartz-feldspar silt, mainly dark gray (5Y 4/1
and gray (5Y 5/1); also greenish gray (5GY 5/1).c. Diatomaceous clay with minor quartz-feldspar silt, gray (5Y 5/1) but with a
slight reddish tinge.
The sediments are stiff and sticky, and much of the core is mottled andbioturbated. Diffuse layers of various colors occur in parts of the core,irrespective of llthological type: black (5Y 2.5/1), grayish green (5G 5/2, 5G 4/2),unnamed ("very dark green", 5G 3/1 and dark greenish gray, (5G 4/1).
Granules and pebbles, mainly of angular and subangular quartz aredisseminated throughout most of core their distribution being independent oflithology.
SMEAR SLIDE SUMMARY (%):
2, 64 4, 66 7, 57
SandSiltClay
COMPOSITION:
Access, mineralsAmphiboleClayDiatomsFeldsparGlassGlaucoπiteOpaquesPalagoniteQuartzRadiolariansSilicoflagellatβsSpicules
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LITHOLOGY
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SA
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LITH0L0GIC DESCRIPTION
DIATOMACEOUS CLAY and CLAYEY DIATOM OOZE
a. Diatomaceous clay, mainly gray (5Y 5/1), greenish gray (5GY 5/1), darkgreenish gray (5G 4/1) and (in Section 3 only) dark greenish gray (10YR 4/2).
b. Clayey diatom ooze, mainly dark greenish gray (5GY 4/1) and gray (5Y 5/1).
The sediments are stiff and sticky, and much of the core is mottled andweakly bioturbated. Diffuse grayish green (5G 4/2, 5G 5/2) laminations occur inboth lithologies in Section 4.
Disseminated granules and small pebbles occur throughout the core,including a 5 cm diameter gneiss in Section 1, 10 cm, and a 3 cm diameterpelite in Section 5, 30 cm.
Minor lithologies:a. Quartz-feldspar silt with minor diatoms, Section 4, 102-103 cm. The silt
grains are angular to subangular, but a few subrounded dirty (altered)twinned feldspar grains also occur.
b. Ash (mainly glass) with diatoms, clay and quartz-feldspar silt, gray (5Y 5/1)in Section 5, 14-16.
SMEAR SLIDE SUMMARY (%):
1, 70 2, 125 4, 102 5, 14 7, 50D D M M D
TEXTURE:
Sand 10 5 10 10 5Silt 70 55 85 70 40Clay 20 40 5 20 55
COMPOSITION:
Access, minerals Tr Tr Tr Tr TrAmphibole — — 2 Tr 1Clay 20 40 5 20 52Diatoms 65 40 10 23 38Feldspar 3 3 20 10 TrGlass — — 1 30 1Glauconite 1 1 3 1 1Opaques 1 1 1 1 1Palagonite — 1 5 1 1Quartz 5 7 50 10 3Radiolariaπs 2 5 1 3 1S i l i c o f l a g e l l a t e s 2 2 — 1 1
SITE 745 HOLE CORE 21 H CORED INTERVAL 177.0-186.5 mbsfBIOSTRAT. ZONE/
--------•i;;
: - : - : - i - 3 • •
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I-I-I-I-J '.'.
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DIATOMACEOUS CLAY and CLAYEY DIATOM OOZE
Major lithologies:a. Diatomaceous clay with minor quartz-feldspar silt, varying from gray
(5Y 5/1), greenish gray, (5G 5/1, 5BG 5/1), greenish gray (5GY 5/1) to darkgreenish gray. The proportions of the individual sediment components areslightly fluctuating.
b. Clayey diatom ooze, varying from greenish gray (5G 5/1, 5G 6/1, 5BG 5/1,5GY 5/1), light brownish gray (10YR 6/2) to dark gray (5Y 4/1). Theproportions of the individual sediment components are slightly fluctuating.
The sediments are stiff and sticky, and are partly homogeneous, structureless,and partly mottled and/or bioturbated. In parts it is difficult to distinguishbetween the two lithologies as the clay content is fluctuating. Dark gray (N4,5B 4/1) and greenish gray (5BG 5/1) bands occur in several parts of Sections5-7. They are sometimes diffuse, sometimes sharp. Granules are disseminatedthroughout the core but seem more frequent in the clayey diatom ooze.
Drilling disturbance:Section 1, 0-110 cm, is totally disturbed and soupy. No structures arepreserved. In Section 3, around 50-95 cm, the boundary between diatomaceousclay and clayey diatom ooze is displaced and smeared downwards in themiddle of the core.
SMEAR SLIDE SUMMARY (%):
TEXTURE:
SandSiltClay
COMPOSITION:
Access, mineralsAmphiboleClayDiatomsFeldsparGlassOpaquesQuartzRadiolariansSilicoflagellates
2, 35D
203050
Tr—4530
5—
215
3Tr
3, 110D
155035
TrTr
3050
5Tr1752
SITE 745 HOLE B CORE 22H CORED INTERVAL 186.5-196.0 mbsf
BIOSTRΔT. ZONE/
FOSSIL CHARACTER
T
745B-22H 1
L-_-_
l•~-~-I-1 •
t-z-‰
L-_-_-J
^ :-:-:-d•
LITHOLOGIC DESCRIPTION
DIATOMACEOUS CLAY and CLAYEY DIATOM OOZE
Major lithologies:a. Diatomaceous clay with minor quartz-feldspar silt, varying from gray (5Y5/1, 10YR 5/1), greenish gray, (5G 5/1) to dark greenish gray (5G 4/1).b. Clayey diatom ooze, varying from gray (5Y 5/1, 10YR 5/1), greenish gray (5GY5/1) to dark greenish gray (5GY 4/1). Grayish green (5G 5/2) layers occurwithin this lithology in Section 2, 60 cm and 86 cm.
The sediments are stiff and sticky, and are partly homogeneous and partlymottled and boiturbated. Diffuse grayish green (5G 5/2) laminations occurin several parts of the core. The two lithologies are patchily mixed inSection 6, although diatomaceous clay is dominant.
Disseminated quartz and feldspar granules and small pebbles occurthroughout.
Minor lothology:A white silt layer with green clay occurs in Section 6, 9-10 cm.
SMEAR SLIDE SUMMARY (%)
3,82 4,110 6,130
TEXTURE:
SandSiltClay
COMPOSITION:
Access. MineralsAmphiboleClayDiatomsFeldsparGlassGlauconiteOpaquesPalagoniteQuartzRadiolariansSilicoflagellat.es
155530
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SITE 7 4 5 HOLE B CORE 2 3 H CORED INTERVAL 1 9 6 . 0 - 2 0 5 . 5 mbsf
BIOSTRAT. ZONE/FOSSIL CHARACTER
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GRAPHICLITHOL0GY
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LITHOLOβlC DESCRIPTION
DIATOM OOZE and DIATOMACEOUS CLAY
Major lithologies:a. Diatom ooze with minor clay, homogeneous, gray-green (5Y 5/1, 5GY 6/1),
with occasional color bands and mottles. Scattered small pebble andgranule lonestones occur, composed of lithics and quartz.
b. Diatomaceous clay, mainly homogeneous, greenish gray (5G 5/1) andreddish brown (10R 5/1), with rare granule lonestones. Texture estimated tobe 5% sand, 45% silt, 50% clay on the basis of smear slides.
Minor lithology:Silt (Section 4, 115, 120 cm), olive-gray (5Y 6/1), as 0.5 cm thick laminae, wellsorted, quartz-feldspar and heavy minerals. Texture estimate: 3% sand, 92%silt, 5% clay.
SMEAR SLIDE SUMMARY (%):
SandSiltClay
COMPOSITION:
AmphiboleClayDiatomsFeldsparGlassGlauconiteOpaquesQuartzRadiolariansSilicoflagellates
1, 47 3, 77 4, 116 7, 31M
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GRAPHICLITHOLOGY
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LITHOLOGIC DESCRIPTION
CLAYEY DIATOM OOZE and DIATOMACEOUS CLAY
Major lithologies:a. Clayey diatom ooze, mainly homogeneous, gray-green (5Y 5/1, 5GY 5/1) or
olive-gray (5Y 5/1), with occasional mottling (e.g., Section 4, 80-85 cm; palered, 2.5YR 6/2) and vague color-layering (e.g., Section 1, 50, 138 cm; Section2, 62, 131, 145 cm; Section 5, 43-55, sharp base). Also with scatteredgranule and small pebble lonestone clasts.
b. Diatomaceous clay, mainly homogeneous, greenish gray (5GY 5/1, 5BG 5/1,5G 5/1) to olive gray (5Y 5/1) and pale red (2.5YR 6/2), with occasional vaguecolor-layering (e.g., Section 5, 66-73 cm) and a small number of granule and
fraction.
SMEAR SLIDE SUMMARY (%):
4, 60 5, 55M M
TEXTURE:
Sand 3 5Silt 42 70Clay 55 25
COMPOSITION:
Amphibole Tr —Clay 60 35Diatoms 25 60Feldspar 2 —Glauconite Tr —Opaques 2 TrQuartz 5 1Radiolarians 3 —Silicoflagellates — 1Spicules Tr —
745B-24H
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