SITE 780 HOLCOREE 1 AH CORED INTERVAL 3086.8-3090.3 mbsl:780A

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SITE 780 HOLE A CORE 1H CORED INTERVAL 3086.8-3090.3 mbsl: 0.0-3.5 mbsf 780A-1HJ 2]
LITHOLOGIC DESCRIPTION
SILT-SIZED SERPENTINE
Major lithology: SILT-SIZED SERPENTINE, gray (5B 5/1) with light gray blue (5BG 6/1)
laminations up to 1 cm thick.Green (5B 4/1) to dark green (5G 7/2) clasts of serpentine are
commonly subrounded to rounded and are locally pulverized. Clast size ranges from 1 to 5
SMEAR SLIDE SUMMARY (%):
1,5 1,28 1,73 1.126 2. 17 2.50 CC. 40
Sand 30
Silt 60
Clay 10
COMPOSITION:
Amphibole _
Aragonite —
Carbonate grains Tr
Chlorite 2
Clay — — — — 20
Dolomite —
Fish Tr — — —
Opaques 9
Organic matter 4 7 1 2 20
Serpentine 85
Thulite — 88 89 95 55
Zoisite —
SMEAR SLIDE SUMMARY (%):
CC.54
D
TEXTURE:
Sand 5
Silt 75
Clay 20
COMPOSITION:
Aragonite 5
Carbonate grains Tr
Chlorite Tr
Foraminifers Tr
Nannofossils Tr
Opaques 5
Organic matter 15
Radiolarians Tr
Serpentine 65
Zoisite 10
SITE 780 HOLE B CORE IR CORED INTERVAL 3094.0-3102.7 mbSl; 0.0-8.7 mbsf
BIOSTHAT. ZONE/
FOSSIL CHARACTER
LITHOLOGIC DESCRIPTION
SILTY SAND-SIZED SERPENTINE, ARAGONITE-BEARING SERPENTINE SAND, AND
ORGANIC REMAINS-RICH SILTY CLAY
Major lithology: SILTY SAND-SIZED SERPENTINE, dark blue gray (5B 4/1) with light blue
gray (5B 7/1) streaks and rare pockets and local layers of pale yellow (5Y 8/3) ARAGONITE-
BEARING SERPENTINE SAND. Includes black (7.5YR 2/0) clastε up to 2 cm in diameter
and rounded mm-size and smaller serpentine grains. Phacoidal flakes are present locally as
detrital grains. The intervals from 110 to 117 cm in Section 2 and from 0 to 19 cm in the core
itcher consist of ORGANIC-REMNANT-RICH SILTY CLAY, dark yellowish brown (10YR 3/6
to black (7.5YR 2/0) with subrounded grains of serpentine up to 3 mm in diameter and loc
:entrations of aragonite needles.
SMEAR SLIDE SUMMARY (%):
1, 8 1. 4 2, 42 2, 78
D D D M
TEXTURE:
Sand 10 15
Silt 30 25
Clay 60 60
COMPOSITION:
ACCCraahalrlcogbirotoietnneiatete 111 I I I I
36 — —
Garnet
otossils
Opaques 10
Organic matter 2
Radiolarians 1
Serpentine 78
Silicoflagellates 2
Spicules —
SMEAR SLIDE SUMMARY (%):
2,115 3,16 4,72
TEXTURE
Sand 33 12
Silt 33 2C
Clay 33 BE
COMPOSION:
Aragonite 15 _
Chlorite 1
Dolomite Tr —
Garnet 1
Nannofossils — —
Opaques — 4
Organic matter 35 2
Serpentine 50 Qi
Zoisite
SITE 780 HOLE B CORE 2R CORED INTERVAL 3102.7-3112.2 mbsl; 8.7-18.2 mbsf 780B-2R! 11 CC'
BIOSTRAT. ZONE/
FOSSIL CHARACTER
LITH0L0G1C DESCRIPTION
SILT-SIZED SERPENTINE
SMEAR SLIDE SUMMARY (%)
1,60 1, 125
M D
TEXTURE:
Sand 10 10
Silt 50 45
Clay 40 45
COMPOSITION:
Carbonate grains Tr Tr
Epidote Tr Tr
Opaques 30 10
Serpentine 65 BO
Zoisite 5 IC
s
SITE 780 HOLE C CORE 1R CORED INTERVAL 3083.4-3088.9 mbsl; 0.0-5.5 mbsf 780C-1
5
LITHOLOGIC DESCRIPTION
I0
15
CLAYEY SILT-SIZED SERPENTINE
20
Major lithology: CLAYEY SILT-SIZED SERPENTINE, light olive gray (5Y 5/2) to bluish gray
(5B 6/1). Core shows little stratigraphic integrity because of drilling disturbance. Contains
scattered green and black angular lithic fragments 1 to 5 cm in size and local layers and 25
patches of brown (10YR 5/3) to medium gray (N5) foraminifer-rich silty clay as.well as local
layers of brownish yellow (10YR 6/8) aragonite-rich material.
30
SMEAR SLIDE SUMMARY (%):
35
4,75 CC, 13
40-
TEXTURE:
Sand 40 60 6 45
Silt 30 30 3
Clay 30 10 1
50
COMPOSITION:
Aragonite _ 30 2 55-
Carbonate — — — — Tr
Chlorite — — T
Clay — — 60-
Diatoms — —
Epidote — 2 — — Tr 65
Foraminifers 5 — — — 10
Micrite 10 —
Nannofossils 2 — — — 10 70
Opaques 20 8 5
Organic matter — 40 2
Radiolarianε — — — — 10 75
Serpentine 63 20 5
Silicoflagellates — — — — Tr
Spicules — — 80
Zoisite T
85
90
95
100
105
0
15
120
25
30
135
140
45
50
SITE 780 HOLE C CORE 2R CORED INTERVAL 3088.9-3097.4 mbsli 5.5-14.0 mbsf 780C-2
BIOSTRAT. ZONE/
- FOSSIL CHARACTER ? I
TIME-I MIFEFFORAMIIw IISSO<zzn »R^RADIOL/M DIATOM! AGNEPALEOM- PHYS. 1B1CHEMIS' SECTIOI METERS LIGTRHAOPLHOICGY STIDRILLINa SED. S1 SAMPLE LITHOLOGIC DESCRIPTION
ENE ••1 -HUH! O ** SILTY SAND-SIZED SERPENTINE
o CC | Major lithology: SILTY SAND-SIZED SERPENTINE, dark blue gray (5B 5/1 and 5B 4/1) with
o CD LL CC streaks and mottles of lighter blue gray (5B 1/7 to N7) and light green (5G 7/2). Contains a
\— O<N tew subangular pebbles up to 5 cm in diameter and scattered sand- to small pebble-sized
co m "~° clasts of serpentine. An interval of faint laminations (primary?) occurs at 10 cm in Section 1
Lu and an interval of brown sandy laminae occurs at the base of the core.
.Q_]_ .Oo O fs SMEAR SLIDE SUMMARY (%):
tx •st
LU 1.9 1, 25 CC, 6 CC, 8 CC. 14
Q_ z * * D D D D D
α o
TEXTURE:
LU
Sand 20 50 60 60 30
o Silt 60 30 20 30 40
O Clay 20 20 20 10 30
CO COMPOSITION:
LU
_J Aragonite — — — — 1
Q. Carbonate grains — Tr — — —
LU Chlorite — Tr — — —
_l Diatoms — — — — 1
Q Epidote 5 — — — —
Q
i Opaques 10 5 10 5 7 DO
Organic matter 20 20 15 10 20
Serpentine 65 75 70 85 65 f U
SITE 780 HOLE C CORE 3R CORED INTERVAL 3097.4-3106.9 mbsl; 14.0-23.5 mbsf
BIOSTRAT. ZONE/ I OQ UΛ
TIME-ROCK UNIT FORAMINIFERS NANNOFOSSILS RADIOLARIANS DIATOMS PALEOMAGNETICS PHYS. PROPERTIES CHEMISTRY SECTION METERS LIGTHRΔOPLHOIGCY DRILLING DISTURB. SED. STRUCTURES SAMPLES LITH0LO0IC DESCRIPTION 9OOθ£
95-
No sedimentary material was recovered in this core.
C-
1 IM lOO-~
• 0.5-
OCM
I05-
IIO-
II5Z
125-
130-
140
145
150
SITE 780 HOLE C CORE 4R CORED INTERVAL 3106.9-3116.4 mbsl; 23.5-33.0 mbsf 780C-
BIOSTRAT. ZONE/
FOSSIL CHARACTER
LITHOLOGIC DESCRIPTION
SANDY SILT-SIZED SERPENTINE
Major lithology: SANDY SILT-SIZED SERPENTINE, bluish gray (5B 6/1) with serpentir
clasts from mm-size up to 1 cm. Core contains some aragonite.
SMEAR SLIDE SUMMARY (%):
TEXTURE:
Sand
Silt
Clay
COMPOSITION:
Carbonate
Opaques
Serpentine
SITE 780 HOLE C CORE 5R CORED INTERVAL 3116.4-3125.9 mbsl; 33.0-42.5 mDSf
BIOSTHAT. ZONE/
FOSSIL CH4RACTEB
GRAPHIC LITHOLOGIC DESCRIPTION
LITHOLOGY
CLAYEY SILT-SIZED SERPENTINE
Major lithology:
CLAYEY SILT-SIZED SERPENTINE, greenish gray (5B 5/1) with scattered dark, sand-to
granule-sized lithic (probably serpentine) and 2 large (3 to 4 cm) clasts of serpentinlzed
harzburgite. Aragonile needles are common throughout the core.
SMEAR SLIDE SUMMARY (%):
1.33 CC, 3
Sand
Silt
Clay
COMPOSITION:
Opaques
Serpentine
Thulite
SITE 78C HOLE c CORE 6R CORED INTERVAL 3125.9-3135.5 tnbSl; 42.5-52.1 mbSf 780C-6RI 780C-7RJ 1
BIOSTRAT. ZONE/ co It'
UNITIME- ROCK FORAMINIFEen NANNOFOSSIw RADIOLARIAIm DIATOMS TICSPALEOMAGNE PHYS. PROP CHEMISTRY SECTION METERS LIGTRHAOPLHOIGCY STURDRILLING Dl URESEO. STRUC SAMPLES LITHOLOGIC DESCRIPTION Ii 5o—-HJiwwt
V *
i Major lithology: CLAYEY SILT-SIZE SERPENTINE, greenish gray (5BG 5/1) with several 2 to
C- 0.5- IM 3 cm clasts of serpentinized ultramafic rocks.
o 1 : SMEAR SLIDE SUMMARY (%): 25—1?li
121 1D. 2 30- i η
TEXTURE: 35- i j
SSailtn d 6100 40- H
Clay 30
COMPOSITION:
j -i
Opaques 2 50-
Serpentine 98
i\
| ]
SITE 780 HOLE C CORE 7R CORED INTERVAL 3135.5-3144.9 mbsl; 52.1-61.5 mbSf
60-
BIOSTRAT. ZONE/
1 FOSSIL CHARACTER
65-
LIGTRHAOPLHOICGY LITHOLOGIC DESCRIPTION 70- J
75-
CLAYEY SILT-SIZED SERPENTINE 1
80- |
Major lithology: CLAYEY SILT-SIZED SERPENTINE, greenish gray (5G 6/1) with approxi-
mately 25% angular, small pebble-sized serpentine?) clasts and sand- to granule-sized
lasts. Lithics vary from light greenish gray (10YR 7/1) to dark greenish gray (10YR 4/1). The 85- j ._
basal portion of the core exhibits faint planar laminations (primary?) and the entire core
coarsens upward; the size of the lithics progresses from coarse sand-size at the base to
pebble-size at the top. 90- \ A
SMEAR SLIDE SUMMARY (%):
95-
100- -H
1 A
105-
Clay 110- J
COMPOSITION: J
115-
Opaques
Serpentine
120- \
125-
130-
135- -i
140-
145- —
I oO~~ _
SITE 780 HOLE c CORE 8R CORED INTERVAL 3144.9-3154.5 mbsl; 61.5-71.1 mbsf 780C-8W J]
TIME-tROCK BFNIFEI| FORAMI10OIOSSSNANNOFOSSIIoTIL>R ATCAR^RADIOLK.H AZRO1 DIATOMwANCET/ER PALEOKIAGNE- <PROPI1 PHYS.£o TRY| CHEMIS I SECTIO METER!- LIGTRHAOPLHOIGCY US| DRILLIIIG DlJRB. J! 1I SED. STRUC1»s *1 SAMPLEw CLAYEY SILT-SIZED SERPENLTITINHEOLOGIC DESCRIPTION
> Major lithology:: CLAYEY SILT-SIZED SERPENTINE, greenish gray (5B 6/1) with scattered
0.5— sand- to granular-sized dark lithics (serpentine?).
C- 1 : IM SMEAR SLIDE SUMMARY (%):
1 .0- 1, 8
- D
TEXTURE:
Sand 10
Silt 60
Clay 30
COMPOSITION:
Opaques 5
Serpentine 95
SITE 780 HOLE C CORE 9R CORED INTERVAL 3154.5-3164.2 mbsl; 71.1-80.8 mbsf
BIOSTRAT. ZONE/
TIME-ROCK UNIT FORAMINIFERS NANNOFOSSILS RADIOLARIANS DIATOMS PALEOMAGNETICS PHYS. PROPERTIES CHEMISTRY SECTION METERS LISTRHAOPLHOIGCY DRILLING OISTURB. SED. STRUCTURES SAMPLES LITHOLOGIC DESCRIPTION
I ü * CLAYEY SILT-SIZED SERPENTINE
inα> 1 IM Major lithology: Greenish gray (5B 5/1) with sand-sized clasts of serpentine and serpentinized
0.5- ultramafics.
SMEAR SLIDE SUMMARY (%):
1,2
D
TEXTURE:
Sand 10
Silt 60
Clay 30
COMPOSITION:
Opaques 1
Serpentine 99
SITE 780 HOLE C CORE 1 OR CORED INTERVAL 3164.2-3173.9 mbsl; 80.8-90.5 mbsf 780C-12RI 1
TIME-ROCK UNIT FORAMINIFERSBIOSNANNOFOSSILSTRARADIOLARIANST. ZODIATOMSNE/ PALEOMAGNETICS PHYS. PROPERTIES CHEMISTRY j SECTION METERS LIGTRHAOPLHOIGCY DRILLING DISTURB. <>SAMPLES 1 LITHOLOGIC DESCRIPTION
CD C- IM This core contained no sedimentary material.
>
SITE 780 HOLE C CORE 1 1 R CORED INTERVAL 3173.9-3183.6 mbsl; 90.5-100.2 mbsf
BIOSTRAT. ZONE/
TIME-ROCK UNIT FORAMINIFERSFOSSNANNOFOSSILSIL CRADIOLARIANSHARDIATOMSACTER PALEOMAGNETICS PHYS. PROPERTIES CHEMISTRY SECTION METERS LIGTRHAOPLHOIGCY DRILLING DISTURB. SED. STRUCTURES SAMPLES LITHOLOGIC DESCRIPTION
1 I M This core contained no sedimentary material.
SITE 780 HOLE C CORE 1 2R CORED INTERVAL 3183.6-3189.9 mbsl; 100.2-106.5 mbsf
75-
BIOSTRAT. ZONE/ I
TIME-ROCK UNIT FORAMINIFERSFOSSNANNOFOSSILSIL CRADIOLARIANSHARDIATOMSACTER PALEOMAGNETICS -L CHEMISTRY SECTION METERS LIGTRHAOPLHOIGCY DRILLING DISTURB. SED. STRUCTURES SAMPLES LITHOLOGIC DESCRIPTION
SANDY SILT-SIZED SERPENTINE
• 1
: IM Major lithology: SANDY SILT-SIZED SERPENTINE, dark greenish gray (5B 5/1) with pebble-
OCM sized clasts. One clast is pale green (5G 7/2), the other is dark blue gray (5B 4/1). Both clasts
are serpentinized ultramafics rocks.
SMEAR SLIDE SUMMARY (%):
1,6
D
TEXTURE:
Sand 40
Silt 40
Clay 20
COMPOSITION:
Chlorite 5
Clay 10
Micrite Tr
Opaques 5
Serpentine 75
Zoisite 5
SITE 780 HOLE C CORE 1 3R CORED INTERVAL 3189.9-3199.4 mbsl; 106.5-116.0 mbsf 780C-13R; 1
TIME-ROCK UNIT FORAMINIFERS 1 3 - NANNOFOSSILS j µ Jj 1RADIOLARIANS I •~ROACN1EER PALEOMÀGNETICS PHYS. PROPERTIES CHEMISTRY SECTION METERS GRAPHIC DRILLING DISTURB. SED. STRUCTURES SAMPLES LITHOLOGIC DESCRIPTION
. i . IM SILTY SAND-SIZED SERPENTINE
1 , Major lithology: SILTY SAND-SIZED SERPENTINE, bluish gray (5B 6/1 V Occurs as soft
,T IM matrix material between two large pieces of ultramafic rock.
OCN SMEAR SLIDE SUMMARY (%):
θCL.
1,53
D
TEXTURE:
Sand 55
Silt 35
Clay 10
COMPOSITION:
Chlorite 5
Clay 10
Micrite Tr
Opaques 10
Serpentine 70
Zoisite 5
SITE 780 HOLE C CORE 1 4R CORED INTERVAL 3199.4-3208.9 mbsl; 116.0-125.5 mbsf
TIME-ROCK UNIT FORAMINIFERSBFOI0SSSNANNOFOSSILSTILR ACTRADIOLARIANS.H AZRODIATOMSANCET/ER PALEOMÀGNETICS PHYS. PROPERTIES CHEMISTRY SECTION METERS LITGHROALOPGHYIC DRILLING DISTURB. SED. STRUCTURES SAMPLES LITHOLOGIC DESCRIPTION
IM This core contained no sedimentary material.
r