SITE 745 HOLE A CORE 1H CORED INTERVA745A-1HL 0.5-9.5 … · ROC K UNI T TIME->-< cc ... DRILL S o o i 1 o FRUCTURE S 1 SED. S ... zones, but smear slides show little compositional

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.


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.


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


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.


TEXTURE:

SandSiltClay

COMPOSITION:

Access. MineralsAmphiboleClayDiatomsFeldsparGlassOpaquesQuartzRadiolariansSilicoflagellatesSpicules

355510

Tr15

80311331

Tr

1,80D

2,80 3,80 6,80

m

S I T E

RO

CK

U

NIT

TIM

E-

>-

<

cc1111—

<

z>σ

745

BIOSTRΔT.

NIF

ER

SF

OR

ΔM

I

TOg

Cb

X

•coCl.

c-• -

TO

•Q

oCΛ

o<u

5

OS

SIL

S

Z

α

1

RA

DIO

L

<N

o<

HOLE

ZONE/

DIA

TO

Mg

en

c

<o

oX

c

o

?ooQ.

à3to

O<n

C

òo

<

E

i

PA

LEO

M

#

O

•

•

•

*

*

*

*

3

PR

OP

ER

TIE

SP

HY

S,

14

8•

fi1%

>*

03

r>σ>

*H ^

> *

. 0 0

CO —

θ ^

^ • 00

> S

*3

TR

YC

HE

MIS

—.O

"in

oo

o

o

o

•

CORE

SE

CT

IO;

1

2

3

4

5

6

7

ME

TE

RS

0 ,5—

1 .0—

-

-

-

-

-

-

I

-—

I-

—

_

_—-

-—_

-:

-_-

—-

—

--

-

_

4H CORED INTERVAL 2 4 . 0 - 3 3 . 5 mDsf

GRAPHIC

LITHOLOGY

-×^r •^j- |

^~ ^ ^ '

-_

-Λ^~ ^r- µ~-

^ ^ v r--'^ ~ " ^ - ^ L~_•

^ '– -<^ iS~

- w - ^ ^ . • •

^ ^ ~ v ^ -

, . ' •

-^r- ^ y ^ • -

^ ~ ^ ^ r . .

•^s- ~^~ '• ' '

r _ - y '-

^ ^ "v~r"f-'"-"|.

^ ^ .-_-_

-^r- ^ ^ - ' - ~ - ~ - ' •

t•JT~i .

~v-/~ ~^j~t 1" '

^^ r-'-\"•v v t ; } .

- w - (•~-|• •

-~r ^r C-j'•-Λ^• , . - ^ . .

^ ^ ^ ^ L~J..

S\s• |•-'|

^ ^ L-J ;^ v ^ . ^ r~-|. -

-^ rli;;^ ^ "^^ ir_j..

^ ^ rlη• •

~^~ ^ ^ P-l

r-\• •

\- -|

^ ^ h~H••

JG

DIS

TU

RB

.D

RIL

LS

oo

i

1

o

FR

UC

TU

RE

S1

SE

D.

S•

o

=

SA

MP

LE

*

*

*

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.


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

> *

r KH•

L~J .p•-r.

" r l - f •

745B-5H


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.


TEXTURE:

SandSiltClay

COMPOSITION:

AmphiboleClayDiatomsFeldsparOpaquesQuartzRadiolariansSilicoflagellates

1, 107D

1085

5

Tr5

80Tr12

10Tr

3, 134M

—

Tr403532

125Tr

6,37D

105530

TrTr1550102

1552

SITE

!_

IOCK

UN

IIM

E-P

>-(Y< .

~z.Lü|—< t

z>σ

'4S

BIOSTRAT.

IIF

ER

SR

ΔM

IN" •

m

>S

SIL

S |

, NN

OFC

z

CC

RIA

NS

iDIO

LA

α

^ .

OCC

<

HOLE

ZONE/

5

S

C0)

c

Q .

• ^

= ;

<J

o

<

E

SG

NE

TIC

SL

EO

Mi

•

o

o

o

o

o

o

<o

'RO

PE

RT

IE

>-

<O•

54

%

> *

^Ifi

s>*

< ^ •

- X

— m

IEM

IST

u

O

Λo

J?

-:

*?o

i?

o

o

o

y

•

CORE

:CT

ION

m

1

2

3

4

5

6

7

CC

:TE

RS

2

-

0 . 5 -

-

1 .0—

\

-

-

-

_

-

_-

_

-—

-

--

-

-

-

-

-

-

6H CORED INTERVAL 4 3 . 0 - 5 2 . 3 mbsf

GRAPHICLITH0L0GY

•^• ,-:-:-; •

•^~ K>H ::• v C-I-3 •

~^J~ l-~-~-i~1- p——Z~i

^ ^ Hi-Hi • •

^– G O O : :

^ ^ t-Z-J'.'."^~ r r ..

c-:-n::•^ ^ I - _ - _ - J • • • •

^~ i- i- i- j:: • •

^L-~-~-O••:

C-I-I-4 :: •

^ " ^ l - - - - ~ 3 • •..r_-_-j • .

~v-/~ L~-""^j-----j ^ •

"^^ C-~-~-\ •. _-_-_ ..

-w- D00 •"

^_^ rl-I-j;;Kjod •::

^~ L"-_-_J . . •t_———_~1 • •

~w- r~-~-j "Ü----T; ;'.:

^~ r - - - -J •. • •

^ . µ - - - - T • : :^

- - - - - • . .

^ L-z-z-j'.:^ f _ - _ - j • •

^^ t-i-i-j..

^ ü-i-i-j::•^ rOOOj • •

^ •z-z ••

a D

IST

UR

ooOQ

RU

CT

UR

E!

D. S

T

»

t

,MP

LE!

CO

*

*

OG

IW

*


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.


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

3CK

U

NI

>-<Z

a:Lüi—<3

σ

745BIOSTRAT.

FE

RS

RA

MIN

I

" •

CO

3S

ILS

INN

OF

O!

z

CD

1

iDIO

LA

F

ocr

<

HOLE

ZONE/

15

c

c

"^

rçj

o

ò>

o<

SN

ET

ICS

*

#

o

o

o

o

o

3

! n -« i

T

"Ir>

> *

5"

IEM

IST

F

O

°

CORE

CT

ION

0,

2

3

4

5

6

7

:TE

RS

0.5—

1 . 0 -

-

j

-—

--_—----

—

-

-I

—

—

-I-

—

7H CORED

GRAPHIC

LITHOLOGY

A ^ ^ r L~J

^ ^ -Wt-J

I— H'" ^ ^ ^ T- l |

^ ^ – ^y~ | .^_l

^ ^ KJ-I-I-j •

I—~H

•Λ^ ^ ^ L-]•

^ ^ " ^ ~ r_η

^ ^ -^– l~- •_ lr_1 •

^ p-I-I-I-j•I .

-w- KI-I-Z~I"'^ j ~ - ~ - ~ - ~ - • ' i

-w- L~I~I~~~' •->-t-~-~-~-i •

^r- -~-~-~-~i

-J--yyy,'• w __-_-_- ]

^~^ ^ ^ f-~H

^ ^ • v i z - j •

^ ^ " L~_1.

^ ^ ^ ^ L~J

^ ^ L~~-1'

_^_ ^^_ j j -~•. •

- ^ •v -ü;

^ ^ ^ ^ - i •.

§|^ y - - w r l " , •

~ ~ ~ —J~ ^ ^ ^ ! - - , •

DIS

TU

RS

ILL

ING

oo

o

JCT

UR

ES

D.

ST

RI

w

1

I0

1

1

1

0

NTERVAL 5 2 . 5 - 6 2 . 0 mbsf

MP

LES

*

PP

*

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.


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.


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


BIOSTRAT. ZONE/

T

cc

r-


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.


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

Tr—

SITE

UN

z>

2

TIM

E-

Lü1—<Z>σ

Lü

LüOo_Jü.

CC

Q.Z>

74E HOLE8I0STRAT. ZONE/FOSSIL CHARACTER

INF

ER

SFO

RA

MI

OS

SIL

SN

AN

NO

FLXT'

RIA

NS

RA

OIO

L/

inCC

DIA

TO

M

-?

ens

erg

< •

Clv.

• O

CC

CD

E

<n

AG

NE

TIC

PA

LE

OM

O

O

O

o

o

o

o

o

•

o

IE!

R0P

ER

1P

HY

S.

f

•

>*

•>i

x "

> *

50

7

> *

T

>-

CH

EM

IS

o

<J

•

So

CORE

SE

CT

IOh

1

?

3

4

6

7

ME

TE

RS

-0 . 5 -

1 .0—

-

-

-

-

-

I

-_

--

--

__-

-

:

-

-

-_

_

-

\

,

10H CORED INTERVAL 81 .0 -90 .5 mbsf

GRAPHICLITHOLOGY

-w- L '-w- •VL" -_"".

v vL-.v.

•^^r ^ j

v K-----•

^^ jp•-~-~-~^ r •

• v f_-_-_•

-w r

-^>-• v 1

-v-r L~_ " I^/ ._

-v_r " ~ ,

~v_^ ~V-^L.

r•\j- \ — ~ - ~ - ~

-\^/- -v_/-' •1 '

~^^~ 1

M-x---:-:

T_Λ-vr r----.--•

-v•r r .

•w J"-~-~-

-i_r ;

~^~ "^"KI-I-I-

-v^ i-----~-Z-_jyi_-

-v n-~-~-~-~-~

t r

1

DR

ILL

IN

hi

RU

CT

UR

SE

D.

ST

O

. . .

0

- •

. — .

o

:::

. . .

SA

MP

LE

*

*


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.


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


•RO

CK

U

l

2

*~

11 |

LüO

o_ iα_

ccLüQ.Q.

BIOSTRAT. ZONε/

FOSSIL CHARACTER

INIF

ER

S1

RA

M

" •

CD

FO

SS

ILS

>N

NO

z

(X

.AR

IAN

S>

DIO

l

K

mCL•z.

o<

5

o1 ^TO

•O

<o

ct$oCO

oN

•C

O•V

CO

isc

u

T 3

cOCO

O

o

<

•

•

o

O

O

O

O

O

> *

^ 7

•

in inT *?> *^°

T

" > ?

into

> *

r- '

•

i

i5

=0.

1

r>oo

•

•

ooo

X

:CT

IC

CO

1

2

3

4

5

6

7

CC

;TE

R

0.5—

1 .0—

-

_--

-

-

-

"I--

---

_-

—

-_

\

-;-

I

-_-

GRAPHIC

LITHOLOGY

^S~^S^ i>I•

^ ^ • ^ ^ —

l-_-'

^ _ ^ ^ ^ r~~•

^ _ ^ ^ ^ |_^_

•^r- -Λ^- L~I"

"V- " ^ ^ |_~_"

^ ^ ^ ^ r-"•

^ ^ ^ L~-

-w- - \ j - T-~-^ ^ ^ ^ L~_"

^ v ^_^ r~-L~~_

~ ^ ^ ^ ^ µ~J

^ " ^ ^ " ^ i~_~.

~ ^ ^ ~ ~ ^ ^ ~ _ ~

^-^ -w- f_-.^ ^ ^ ^ ^ • - -

~ w ^ ^ ~ — •

^ ^^ c-z^ ^ ^ ^ C-I•

^^ ^^ r_-.

^ ^ ~^~ r-~•^ ^ - w - µ - _ •

^ ~ • ^ ^ • ^ 1 ;

^ ^ " ^ t - I •

T— -

^ ^ ^ µ i -

^ ^ ^ ^ L-_•

- v j - ^ ^ U~-"

^^ ^^ r-"

L-~—

-w- ^ ^ '~~

•Λ_T ^ Λ - r "

^ ^ "" h_~

-w- -w- L~-

IRB

1

IIL

LI

o

1

.-0

0

o0

•5

~ •

0

. _ .

0

o

_J

S

*

*


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.


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

i

SI IL

RO

CK

U

NIT

3

•"

Lü

~~

o—1

Lüa.Q_

7 4 5 HOLEBIOSTRAT. ZONE/FOSSIL CHARACTER

INIF

ER

SR

AM

o

CO

FO

SS

ILS

S

CO

.AR

IAN

SD

IO

<r

IDLTZ

o

01\

5

(n

*+-

C•>

CO

t-1oc( 1

Cos

L L

B

«

MA

GN

ETI

CLE

O

<

o

ü

o

o

o

n

PR

OP

ER

!

«=sp—.

Six

in

in to

> *

s.oo

*

n»-°

o

•

STR

YEM

I

X

o•

o

<N

o

πora

o

oo

r

CORE

CT

I

«

1

?

3

4

5

6

7

TER

2

0 5—

1 .0—

-

-

-

-

-

-

-

-

_--

_-

--

—

-

i

-

:

12H CORED INTERVAL 1 0 0 . 0 - 1 0 9 . 5 mbsf

GRAPHIC

LITH0L0GV

^r ^s• L-I-I•

-w i

r~_"-_-.~ ~ ~ ~^^~ i .

^ ^ ^ r-:-:-:

" l - r Lr_~"_"

^ ^ L::=::

i—^u- •v L-~-~

^ v L-:-:•

•^• •^• c-z-i

^ ^ r-—-"-

-wf-λ_/- L~ -_"_-_-

^ ^ ""_-.L .

r_ _ - - _•

~*-λ• - -

-v_r T- - " '-»_ .

-w-

~ * ^

^~^~ r - _ _ .

-Φ•:-:-:-:•

^ : - : - : - : - : •

^y-r_-_-_-_-_•

j - • - - • - .

•V4.-.-.VJ

'Λ-J~ L-_- -

-w V-"-:-:-

RB

NG

D

IST

LLL

§

TR

UC

TU

R

•

3S

O

O

— •

-

°

= :z :

- •

0

o

o

- .

o

oo

o

o

o

-

MP

L

vs

*

*

OG

IW

*

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.


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.


TEXTURE:

SandSiltClay

COMPOSITION:

AmphiboleClayDiatomsFeldsparOpaquesPalagoniteQuartzRadiolariansSilicoflagellatesSpicuies

1,66D

54550

_503531

_52

Tr1

3, 132M

2908

10_7732

65__1

5, 100D

34255

1453531

_83

Tr

SI Ib

UN

ITT

IME

-RO

CK

LU

Lü

_ l

Q.

_ l

7 4 5 HOLEBIOSTRAT. ZONE/

w

FO

RA

MIN

IFE

00

M

NA

NN

OF

OS

SI

rn

RA

DIO

LA

RIA

i n

e>

DIA

TO

MS

TO

TO1 ~ |

Ific

sch

U-

b

TIC

SP

AL

EO

MA

GN

E

•

•

•

o

o

•

•

o

ER

TIE

SP

HY

S.

PR

OP

7 7* * -

•

— in

> *

S *

7 ?>*

to π

> *

«s

CH

EM

IST

RY

-O

o

X

<?

o

8?

o

CaC

CORE

SE

CT

ION

1

3

4

5

6

/

CC

ME

TE

RS

:

•

0 . 5 --

1 .0—

-

-

-

-

-

-

-

1

-

_-

-

_

-

:

-

i

-

-

-

-

14H CORED INTERVAL 1 1 9 . 0 - 1 2 8 . 5 mbsf

GRAPHIC

LITHOLOGY

•^j y

-v^r •i.

L J•

. _ - _ - _ - _ . •

^ ^ L~_~_~_~_~Jt 1 '

^ ^ r•~-~-~-~-~T

- w - l 1

..••.A.~.."..".."..^..-

^ y j .

I- J

111

•u-µ 1.

^ ^ r_- η •

L~_- I

|__ j.

r~ i

i• 1 .

~ v ~'~ r 1 •

I. 1-v -|. 1

! i J i

^^~i _ J•

-w- 1"- 1I . - " - l •

-^-fl-I-I-I-Iη•

^n-:-:-:-n.vc-:-:-:-n:

i 1 •

-w-L 1

~*^" L 1 •

L 1.~^L-_-_-_-_-J

r j •~^~ r- 1'

-w-r_-_-----j.

r j

-w-L 1•

-w- f '

v r _ : _ : - : - = J ;

ST

UR

B.

DR

ILL

ING

D

l

UR

ES

SE

O.

ST

RU

CO

O

0

o

o

o

-

o

o

o

_

=

o

SA

MP

LE

S

**

*


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.


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/

T

cc

745B-15H.

r-z-z-z-Z-Z-

-L-I-Z-I-I-I-t-I-I-I-I-I-

- r-z-Z-Z-Z-Z-C-Z-I-I-I-It-z-z-z-z-•

~t-~-z-z-z-z-- t-Z-Z-Z-Z-~[-Z-Z-Z-Z-Z-

"G-Z-Z-Z-Z-I

- i-z-z-z-z-z-- L-_-_-_-_-_

[-Z-Z-Z-Z-Z-hZ-Z-~-Z-Z-

- Ir-~~-~~-----~

- F-Z~Z-Z-Z-r-z-Z-Z-Z-I

-C-Z-Z-Z-Z-IėZ-Z-Z-Z-Z-

-i-Z-Z-Z-Z-Z-L-Z-Z-Z-Z-I

^

HI-Z-


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

[-1-

r--r-~-•

o

o

o

o

c-:-]

745B-17H 1


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.


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

HI-I-I-I-Ic-i-i-z-i-

L-I-I-Tf->"-~-i.

r_"-~-1 •

hi-]'-C-I•i•



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.


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/

[-Z-Z-Zπ;

rz-z-z-j.

>Z-Z-ZH"rZ=Z :Z-]•

"L-_-_-J•

r Z-Z-Z-ü •r"r---"-"j

f>_-_-Zη

E-I-I-I-]r----_-j

L-_-_-_i

h_-_-_-_Hf_-_-_-_-l

[-Z-Z-Z-]


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.


2, 64 4, 66 7, 57

SandSiltClay

COMPOSITION:

Access, mineralsAmphiboleClayDiatomsFeldsparGlassGlaucoπiteOpaquesPalagoniteQuartzRadiolariansSilicoflagellatβsSpicules

S I T E

UNIT

IME

-RO

CK

LüZLüUo

Q_

:E-o

74eBIOSTRAT .

FOSSIL CHΔ

m

FO

RΔ

MIN

IFE

CD

</>

NA

NN

OF

OS

SI

CD

CO

RA

DIO

LA

RIA

r~•

rr

—

CO

t r

<

HOLE

ZONE/

DIA

TO

MS

T i

O

C

•

<

B

TIC

SP

ΔL

EO

MΔ

GN

E

0

o

o

o

o

HI

156

47 /

- > *

M n

T

oo

H"

CORE

SE

CT

ION

1

3

4

5

6

7

CC

0 . 5 —j

_

1 .0—

-

-

-

-

-

_

-

I

_-

_

:-

-

-

-

_-

-

-—

-

-

-

_-

-

2 0 H C O R E D

GRAPHIC

LITHOLOGY

" ^ '-I-I-J• •

V O I D

•‰r -~-~-~f

•w 1 1i i

-w , ,

"V f-"-"4 'i- — > ' .

r •

^s• K>I-D•.

l-t —_=_ :L

^ ^

— r•:-:-:-:-:

^^r-i-i-i-i•

^ '^-r C-I-I-I-Z

-w+~-•~-~-~--V 1 .

^-^1

[_ •~^-y~ .

•r — - T .-

^ ^ 1 1•

-^S~^ L-I-H •

!~v-/" I

|- r.~ r.~

^ : - : - : - : - :

, - ~^j - - --

[-:-:-:-:

•^j- .

S^~ L-~-~-~-

r~-~-~-~-

~^~ r_-_-j

•v L-_-_-_-

^ ^ L-_-_-_-_

- ^ _-_-

ST

UR

ED

RIL

LIN

G

Dl

UR

ES

SE

D.

ST

RU

C

0

o

Λ

0

O

0

o

—

o

o

o

0

0

0

0

NTERVAL 1 6 7 . 5 - 1 7 7 . 0 mbsf

SA

MP

LE

S

*

*

*



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.


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 • •

-_-_-_-I•i..'-y~-y j . • •

I-I-I-I-J '.'.

r M - M - i • •

r--------i •

ooooo

hl-j;

v©


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.


TEXTURE:

SandSiltClay

COMPOSITION:

Access, mineralsAmphiboleClayDiatomsFeldsparGlassOpaquesQuartzRadiolariansSilicoflagellates

2, 35D

203050

Tr—4530

5—

215

3Tr

3, 110D

155035

TrTr

3050

5Tr1752


BIOSTRΔT. ZONE/

FOSSIL CHARACTER

T

745B-22H 1

L-_-_

l•~-~-I-1 •

t-z-‰

L-_-_-J

^ :-:-:-d•



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

TrTr3055Tr—11—535

— — Tr

— Tr — —

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

CC

GRAPHICLITHOL0GY

- C-I4'

^ ~ — I—~-r

^ ~ h-~J~^rZy•

<Z - 1 _ -|

• - w - i _ - _ H "

K:>:::-:

L--1•

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.


SandSiltClay

COMPOSITION:

AmphiboleClayDiatomsFeldsparGlassGlauconiteOpaquesQuartzRadiolariansSilicoflagellates

1, 47 3, 77 4, 116 7, 31M

SI IL

10CK

U

NIT

i

Xh-

Lü

DIIΛ

I

Lü

<_l

7 4 5 HOLEBIOSTRAT. ZONE/FOSSIL CHARACTER

1IF

ER

SR

Au

CD

OS

SIL

S

Iz

rn

RIA

NS

-1

öα

σ>cc

2

L L

2

a

. ^

OQ

>in

h

>-

>

<

b

w

AG

NE

TK

s°•

•

•

IE!

=R

OP

ER

I

>-

Q.

V < O

D ".

II II

« * -

#

inr>n n

> *

r I O

^ • *

S j > l

m o

> *

o "^

T

s

°

CORE

o

<o

1

2

3

4

5

6

7

CC

2

1

0 , 5 -

1 .0—

-

-

-

-

-

_

-

--

:

--

-

_

-

-

-

-

:

—

-

:

:

—

—

2 4 H CORED INTERVAL 2 0 5 . 5 - 2 1 5 . 0 mbSf

GRAPHICLITHOLOGY

-vy- f~-~-j

-w- - -L~_~J

-\_r t_ '. J •

- i _ r ^j"_~_""_~_1 'f j •

^ _ i .

-v_y- •_-_-J '

^'^z-<á:[ |

VL"-:-:-:-:Tv

rv

": J

• •

^^ r_-_i'

^ ^ ~ ~v"'~t" _-_•) -

1

r- - - - -

RB

1

ILL

Lü

RU

CTU

R

»

<o

o

Λ

o

- -

o'

- •

0

t00

i

II l

l 1

o

= :

._.

"1

MP

*

*



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.


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

m

Documents

SITE 745 HOLE A CORE 1H CORED INTERVA745A-1HL 0.5-9.5 … · ROC K UNI T TIME->-< cc ... DRILL S o o i 1 o FRUCTURE S 1 SED. S ... zones, but smear slides show little compositional