ocean drilling program initial reports volume 121 · site 754 holcoree 1 ah cored interval 0-6.1...

SITE 7 5 4 HOLE A CORE 1H CORED INTERVAL 0 - 6 . 1 mbsfBIOSTRAT. ZONE/

GRAPHICLITHOLOGY

LITHOLOGIC DESCRIPTION

FORAMINIFER NANNOFOSSIL OOZE

Section 1, 0-110 cm is soupy, 110-150 cm is moderately disturbed. Section 2, 0-80 cm ismoderately disturbed, 80-150 cm is slightly disturbed. Sections 3-4 are slightly disturbed.

Major lithology: FORAMINIFER NANNOFOSSIL OOZE, mottled and bioturbated, with colorranging from white (10YR 8/2) to light brownish gray (10YR 6/2).

Core catcher sample mean grain size is 51.2 µm.

SMEAR SLIDE SUMMARY (%):

2. 80 4, 80D D

TEXTURE:

SandSilt

COMPOSITION:

754A-1H

5I0152023035404550556065TO7500859

95too105MO

141

I

I "I

SITE 754 HOLE A CORE 2H CORED INTERVAL 6.1-15.7 mbSf

CC

GRAPHICLITHOLOGY LITHOLOGIC DESCRIPTION


Undisturbed.

Major lithology: FORAMINIFER NANNOFOSSIL OOZE, stark white {whiter than Munsellwhite, 10YR 8/1) to light gray (10YR 7/2), mottled and bioturbated.



2,85 4,85 6,85

SandSiltClay

COMPOSITION:

GlassNannofossils

754A-2H

152025H30

40-1455 0 -5 5 -

657075H808 5 -9 0 -9 5 -

100-105-110—115

120125-I30-;

140^I45H

µ

y ;•.,",'- •1 • ' I H

5 _

,1

) , -

I\ 4

;

SITE 754 HOLE A CORE 3H CORED INTERVAL 15.7-25.3 mbsf

BIOSTRAT. ZONE/

FOSSIL CHARACTER

Jπ

cc

GRAPHICLITHOLOGY

m



The top 30 cm in Sections 4 and 5 are slightly disturbed; i aiπder of core is undisturbed.

Major lithology; FORAMINIFER NANNOFOSSIL OOZE, ranging in color from stark white(whiter than white, 10YR 8/1) to white (10YR8/2), homogeneous, mottled, and bioturbated.

Section 7, 25 cm sample mean grain size is 64.4 µm.


2,85 4,85 6,85D D D

TEXTURE:

Sand 14 20 13Silt 85 80 87Clay 1 — —

COMPOSITION:

Gla

— — Tr

754A-3H X

löZ

, & cc

3035404550-556065-70-7580859095100

115--

120—125130-135-

t

f-:

H

—

SITE 754 HOLE A CORE 4H CORED INTERVAL 25.3-34.9 mbsf>IOSTRAT. ZONE/

GRAPHICLITHOLOGY

I



Section 1, 0-65 cm is soupy, 65-150 cm is moderately disturbed. Sections 2-3 are slightlydisturbed.

Major lithology: FORAMINIFER NANNOFOSSIL OOZE, bioturbated, stark white (whiter tharwhite. 10YR 8/1). with white (10YR 8/2) to very pale brown (10YR 8/3) horizontal laminaethroughout the core.

Core catcher sample mean grs

SMEAR SLIDE SUMMARY (%

TEXTURE:

SandSilt

COMPOSITION:

ForaminifersGlassMicrite

):

2,85D

4060

301

s 79.4

4, 85D

40

302j65

- • • *

u-

L-

S I T E

_

UN

I

oα:

2

LU

MIO

CE

erLU

αCL

BIC

<n

NI

FE

F

<bNO

εocoo

ilia

ro

ti

o

-

Glo

b

Q>•C

<bQ .<u

CCD

C

c<bCn

GIO

I

o

< t

754

STRAT.

<o

OS

SI

I

<vσ>

o

<

<n

AR

I A

h

J

Q

HOLE

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X

5

c<u

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ers

ed

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er

ma

lN

or

0)

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Y

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96

.3

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101

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2

3

4

5

6

7

CC

α

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0.5-

1 . 0 -

:

—

-

•

-

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•

—

-

-

-

—

-

-j

--

i

-

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\

-_

-_

-

5H CORED

GRAPHIC

LITHOLOGY

- ~ -~*~ t ~*~

- + - -*-~ 1 —

"+" ~*~

' -~^ -~-+- H-

" 1 ~ * ~ 1 ~

- - t -

— t — — t —

~ -~^~ -~- - t -

' 1

—(― -

" - l - ~ 1 " - ! - "

•-+-^-+-"

-1- -+-

~ 1 ~ * ~ 1 ~

- - f - -

1 1

" 1 ~ * ~ 1 ~

"•+-^-~

" -•^~ -

÷÷

÷ -

—( 1

" , ~ * ~ ,

-÷-+-÷-—1— —1—

- H -

ST

UR

IG

Dl

HU

•UR

E:

•RU

CI

0)

Q

=

,

=

—

if:—

II

IIu

IIIIIIIIIIIIIIIIIIIIIIIIIIIIU

(I

NTERVAL 3 4 . 9 - 4 4 . 5 mbsf

Jjα.2

s

*

*

*

LITH0L06IC DESCRIPTION


Undisturbed.

Major lithology: FORAMINIFER NANNOFOSSIL OOZE, stark white (whiter than white, 10YR8/1). White (10YR 8/2) horizontal laminshomogeneous and bioturbated.

Core catcher sample mean grain size is


2, 85D

TEXTURE:

Sand 40Silt 60

COMPOSITION:

Foraminifers 40Glass TrMicrite 10Nannofossils 50

e occur

61.3µπ

4, 85D

40

60

Tr

10

50

in Sections 1-3. The remainder of the core is

6, 85O

36

64

25

Tr

15

60

754A-5H

I0-

15-

2 0 -

2 5 -

30-^

4 0 -

4 5 ^

5 0 -

Hbü6 5 ~7 0 -7 5 J8 0 -8 5 -

9 0 -9 5 -

100-iO5-<

(I0-115™

120-125-130-135-140-145-

" I

•

1 , . • • •

, •

• .

-

1ft

ri

W\

1

-

—

-

—

—

—

-

L

—

—

3

1•J

:

—J:

—

m

—

1

150^ 4 ,

-_

\

—

-

—

—

—

_

:

• —

—

i j •

—

1—IL

p-

L.

1

ill^

—

—

— .

1—

li

i

M M •

• M • M •

—

—

_ _

- jW••J

1

- j

—1——

i

7

V 0*

_

—

-

—

-

j??i ~

CC

-

—

-

—

-

-

-

SITE 754 HOLE A CORE 6H CORED INTERVAL 44.5-54.1 mbsfBIOSTRAT. ZONE/FOSSIL CHARACTER



Undisturbed.

Major lithology: FORAMINIFER NANNOFOSSIL OOZE, stark white (whiter than Munsellwhite, 10YR 8/1), homogeneous and heavily bioturbated.



4,85

D

TEXTURE:

Sand 35

Silt 65

COMPOSITION:

Foraminifers 25Micrite 9Nannofossils 65

5^J OH

20 -25-3 0 -35 -40 -4 5 -5 0 -5o60H65H70H75"380H85H90H95H

IOOH105- jMOH115-

120 -125 -130—135-140-145—1 5 0 -

I•

•

y••••

••

-

—

—

-

—

• w • •

j

1

— •

—jü

J- f1

0 . •

:

—

1

cc

SITE

!_

UN

Ii

TIM

E-I

LU

>C

EN

oS

LU

Q

Q

s

754

BIOSTRAT.

2

<•

IFE

FF

OR

AM

I 1

<O

ΛO

ΛO

<u•c

pe

ri

CO

acu

;h

ero

Q .

Q .

<O

TO

OJO

QO

,

<O

o

m

3S

SII

NA

NN

OF

<D

I

CN

5

<

w

IRIA

Nj

RA

DIO

L/

HOLE

ZONE/

j D

IAT

OM

!

Q_

er

A

TIC

S

<

1 P

AL

EO

M•σ

α>e

rsR

evm

al

oz

sed

eve

r

er

|

PH

YS

. f

<N

h

•

<or-

# ^

o

CH

EM

IS'

<D

CORE

1 S

EC

TIO

r

1

2

3

4

5

6

7

CC

ME

TE

RS

0.5-

1 .0-

—

:

i

i

-j

--

--

-

-

j:

;j

—

7H CORED

GRAPHICLITHOLOGY

- - -~*~ , ~*~-+- H-

— — 1 — —

-~+~- ~ -- H ~-t-~ l ~-

-^-÷-^-- -+- -

,

— 1 — -

-t- -+-— 1 —~ ~ ~1"~ -~^ -H-~^~-l-

I—•—ZTl~•~-

"÷÷^~

.^-÷-.

- ÷ ÷ ÷ -

~-f-~1"-!-'

"^-÷÷~"•+-^-+-~

- -•--+- H-

-^^~ -

3TU

RI

O

DR

ILL

IN

UR

ES

RU

CT

1 S

ED

. S

T

1111111111||1 1

| |

1111u\s111111111111111111111111111111111111

NTERVAL 5 4 . 1 - 6 3 . 8 mbsf

SA

MP

LE

:

*



Undisturbed.

Major lithoiogy: FORAMINIFER NANNOFOSSIL OOZE, stark white (whiter than Munsellwhite, 10YR 8/1), stiff, homogeneous and heavily bioturbated. Extremely faint mottles occursin Section 4, 103 cm. Three pale yellow spots occur at Section 5, 2 and 7 cm, and Section 6,87 cm.

Core catcher mean grain size is 24.7 µm.


4,85D

TEXTURE:

Sand 31Silt 69

COMPOSITION:

Foraminifers 25Glass TrNannofossils 75

754A-7H 1 1 3 4 5 β 7

SITE 754 HOLE A CORE 8H CORED INTERVAL 63.8-73.5 mbsf 754A-8H

UN

IR

OC

KM

E-

Lu

zIII

VII

CO

I

LUi

Q

—

BIC

<n

NIF

EF

IF

0a

lls

jn

ns

o

C9

<

STRAT. ZONE/

CO

OS

SIL

NN

OF

NA

in

zo

<

<n

AR

IAN

2

RA

ITO

H

o

CL

tx

TIC

SIA

GN

EL

EO

IP

A

0)

min

ai

ete

r

T3C

w

:RT

IEP

RO

PI

i

io<\

5».

b1

.69

*

TRY

3

CH

r•

<oo>

σ>

σ>

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#

zo

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1

2

3

4

5

6

7

CC

TE

R!

2

I0.5-

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:

1 .0-

I--I

-_--

•

_

- _

-

-

-

:

-

-

-

-

11

11

-

-

GRAPHIC

LITHOLOGY

V O I D

_ l _

"~ — ~

|

| |

1

1 1

_ _ l _

-L- -L-~

— 1 _

-L-_L_-J-

_ 1 _ _ i _

— L -

_ _ l1

"-i-^-J-•

-L- -L-

""L_L.-L•]

- , - 1 - "

-_J_-L_L_-

" _ L _ ~ L • _ 1 _ "

."^"JL."^.

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- L _ | _ - L

1 1

1

z>

MG

D

MLL

I!

αe

UR

ES

i-

cr

SE

I

IIIIIIIIIIIIIIIIIIIIIIIIIIIIII||IIIIIIIIIIIIIIIIIIIIIIIIII

<n

I4P

LES

AI

*

*

*

*


NANNOFOSSIL OOZE WITH FORAMINIFERS

Undisturbed.

Major lithology: NANNOFOSSIL OOZE with FORAMINIFERS. Homogeneous ooze. Starkwhite (whiter than Munsell white, 10YR 8/1). Completely bioturbated. Pale yellow (5Y 8/3)layer in Section 5, 130-144 cm, has sharp lower contact, gradational upper contact andcontains up to 2% ash.

Mean grain size of core catcher sample is 46.1 µm.


2,85 4,85 5,141 6,85D D M D

TEXTURE:

Sand 5 7 10 5Silt 90 88 83 85Clay 5 5 7 10

COMPOSITION:

Foraminifers 20 20 15 15Glass — Tr 2 TrMicrite 5 5 7 7Nannofossils 75 75 76 78Silicoflagellates Tr — — Tr

:: !

JH

i

h-

i

πhi

Hi I

J

; I

4

fi

-j

1j

1

H

r

S I T E

_

z>

iT

IME

-IC

EN

E

o5

ccLu

Oi

7 5 4

BIC

41 F

EI

FO

RA

MII

•o

sa

IθU

JOl

Cn

<o

öu

lin

s

<J

STRAT.

5

11z

<o1

i n

o

o

CO

o

<

<

RA

DIO

L/

HOLE

ZONE/

DIA

TO

M!

CU

TODU

A

Tic

:

5

I P

AL

EO

Mia

te

. _ε

de

tei

c

a

ER

T

|

PH

YS

. 1

" i θ

•

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*

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CH

EM

IS

σ>

•

q

•

96

.5

•

CORE

SE

CT

^

2

3

4

5

6

ME

TE

RS

0.5—

1 .0—

•

—

-

—

I-

i i

i

-

-

—

I

•

-

- m

_

-

-

-j

-—

9H CORED

GRAPHIC

LITHOLOGY

- - 1 - -

~*~ , ~ 1 "

- f - - t -— — 1 — —

—(― — H -

~ 1 ~*~ I ~

- Hh- -

— t — — 1 —

~ _ H ~ _ t _ ~

- 1 — -

H— —)—— 1 — -

~*~ | ""*"

— 1 — — I —

— 1 — —

— _ _ | _ _ — < — _ + _ J —

-~ -~>~-

~~ , ~*~

~ 1 ~*~ 1 ~

|

-\- -+-

- ÷ ^ - ÷ -

-•- ~ ~_(_ _H-— —(― —

B

ST

UI

°

j D

RIL

LIN

M

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RE

RU

C•

SE

D.

ST

1 1

tttttttt\\(t

"I t

tttttt

ttttSS

tttttttttttt

||

tt||"u

NTERVAL 73 . 5 - 8 3 .2 mbsf

j S

AM

PL

E:

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I W

*



Undisturbed.

Major lithology: FORAMINIFER NANNOFOSSIL OOZE, white (10YR 8/1). Slight mottlingwas noted in Section 2 and 4 through 6. Section 5 has a very slight gray color, but notenough to warrant a color change.

Mean grain size is 50.1 µm for Section 6, 105 cm (no core catcher).


2, 85 4, 85 6, 85D D D

TEXTURE:

Sand 35 40 38Silt 65 60 60Clay — — 2

COMPOSITION:

Foraminifers 35 40 35Glass — Tr —Micrite 5 10 5Nannofossils 60 50 60

754A-9p"—*P#β

5H

I0

I SH

20-

40™

45

50

55

6 0 -

65

TO

75

8 0 -

8 5 -

9 0 -

I00-

105-

115

120-125-

(30

140

145-

150-

HU—

R

H

~ j •

-i

j]

_..

SITE 754 HOLE A CORE 1 OH CORED INTERVAL 83.2-92.9 mbsfBIOSTRAT. ZONE/FOSSIL CHARACTER

GRAPHICLITHOLOGY


NANNOFOSSIL OOZE WITH FORAMINIFERS AND MICRITE

Slightly disturbed.

Major lithology: NANNOFOSSIL OOZE with FORAMINIFERS and MICRITE. Homogeneous,completely bioturbated, ooze with alternating colors of stark white (whiter than Munsellwhite,10YR 8/1) and white (10YR 8/2). Pale yellow (10YR 7/8) and gray (10YR 7/8) ashlayers in Section 1, 90 cm and Section 5,104 cm.

Mean grain size of core catcher sample is 47.2 µm.


2,80 4,80 5,100D D D

SandSiltClay

COMPOSITION:

ForaminifersGlassMicriteNannofossilsSilicious Sponge Spicules

157510

15Tr1570Tr

15805

13Tr1570—

10855

11Tr157C—

754A-10F

5 -!0152 0 -2 5 -303 5 -4 0 -4 5 -505 5 16 0 -6 5 -707 5 -80859 0 -95

100

110115—^120125130135140-1453150-

-: 1

r

H

—_.

™ " ••;:, • • " " " * "

H

- - - - j •

r-

••". I

SITE 754 HOLE A CORE 1 1H CORED INTERVAL 92.9-102.6 mbsf

TEXTURE:

SandSiltClay

COMPOSITION:

ForaminifersGlassMicriteNannofossils


NANNOFOSSIL OOZE WITH FORAMINIFERS AND MICRITE

Core is slightly disturbed.

Major lithology: NANNOFOSSIL OOZE with FORAMINIFERS and MICRITE. White (10YR 8/1) in Sections 1-4 grading into white (10YR 8/2) in Section 5. Homogeneous, bioturbated withfaint mottling throughout the core.

Mean grain size is 49.3 µm in Section 6, 80 cm.


2, 2,102 4,85M D

as

8

754A-11H

j " •

15-Z0Z

3 0 -

3 5 -

4 0 -

4 5 -5 0 -

6 0 ^

65-]7<H7 5 ^

8 0 ^85-]9 0 ^

95--100^

I 0 5 -

I I 0 -I I 5 -

I 2 0 -

I 2 5 -

I 3 0 -

! 3 5 -I40—

I45-I R ΛW U

1

••P>

j

—

—

—

—

—

2

I

:—

—>mmm

-

—

Jj —

-J—J

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If ' ;

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——

1

3•""• ' " " <

j •

1 ' ë

-

4

mmm

warn

-

-

-

—

IMM

{ M M

L? h

—

—

—

—

-

—

—

-

U—

1,. ,' ji

1

Li •

—

-

4

1 j

1

';

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—

-

—

—

-

—

-

—

—

5

1

Sy

i

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F

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-

-

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-

-

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—

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—

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6

:.

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?

j

i '•.~•j

: • . 4' • : • ; . !

' ' :

. . . . . . . ;

0_7

~~ r

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—

-

-

M M

—

—

—

—\

- !β

If-I*

—

L.

L •

L.

f—r_

r!f-

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754 HOLE A CORE 12H CORED INTERVAL 102.6-112.3 mbsf

BIOSTRAT. ZONE/

FOSSIL CHARACTER

GRAPHICLITHOLOGY


NANNOFOSSIL OOZE WITH FORAMINIFERS AND MICRITE.

The core is slightly disturbed.

Major lithology: NANNOFOSSIL OOZE with FORAMINIFERS and MICRITE. White (10YR 8/2) homogeneous and bioturbated. Faint ash layers in Section 4, 15-25 cm. Section 5, 8-22cm, and Section 6, 9-23 cm.

Mean grain size is 63.5 µm in the base of the core catcher.


TEXTURE:

SandSiltClay

COMPOSITION:

ForaminifersGlassMicriteNannofossilsSilicious Sponge Spicules

754A-12H

5I0-15

20253 0 -3 5 -4 0 -45505 5 -6065H7075-8 0 -859 0 -

fOOH

I05

I•O—IH5

120

125-130135140

145-51504

t

H

H

H

π

j

I—IH

üL

j

LJU

I! Iπ

Q.

π

π

h

h

h

-

]

-

cc —

4

SITE 754 HOLE A CORE 13X CORED INTERVAL 112.3-122.0 mbSf 754A-13X

BIOSTRAT. ZONE/


NANNOFOSSIL OOZE WITH FORAMINIFERS AND MICRITE.

Core is moderately disturbed, and soupy near the top of Sections 1 and 2.

Major lithology: NANNOFOSSIL OOZE with FORAMINIFERS and micrite. White (10YR 8/2)grading into yellow (10Y 7/8) and brownish yellow (10YR 6/8). Homogeneous, stronglybioturbatθd throughout core.

Mθan grain size for core catcher is 87 µm.


TEXTURE:

SandSiltClay

COMPOSITION:

ForaminifersGlassMicrite

Spicules

1 30D

1.120 2,120 CC, 10D D D

— — 2

M5120

130 -

140 :•

14 D~

1 5 0 -

i-

1 j

oSITE 7 5 4 HOLE A CORE 14X CORED INTERVAL 1 2 2 . 0 - 1 3 1 . 7 mbSf

BIOSTRAT. ZONE/

1 FOSSIL CHARACTER

754A-14X 1

CC

2 3 4 CC


NANNOFOSSIL OOZE WITH MICRITE, FORAMINIFERS AND ASH


Major lithology: NANNOFOSSIL OOZE with MICRITE, FORAMINIFERS and ASH. Yellowishbrown (10YR 5/8). Homogeneous and bioturbated. Shell fragments (about 1 mm in size)scattered throughout.

Mean grain size for the core catcher i:


TEXTURE:

SandSiltClay

COMPOSITION:

ForaminifersGlassMicriteNannofossilsQuartz

2. 90D

108010

15201550Tr

; 33.9 µ

4, 2CD

108010

25101050

754A-15X No Recovery

754A-16X No Recovery

5 -

10-

15-2 0 -

2 5 -

3 0 -

3 5 -

4 0 -

4 5 -

5 5 ~6 0 -

6 5 -

7 0 -7 5 ~8 0 -oc

i

J1Ij

11I

Ij1

Hi90—p9 5

J r100 •J l~IO5j|•

iio-i 1-115 j 1120 J 1

I3θj| 1-135 J i-140 J B-145 J 1-150-91-

M\ iL

JBB

üf'rf

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•1

{• -

•

v

; úfl•i ii i

•PJ

i

:( !

1

I 'J

H-----i

1

—ll ,

-

-

—.

_ _

_; _

- * * — —

i — •—

: j , i

J _.. ;_

J | _ _

—1 —i Ml —

- .—| —

SITE 7 5 4 HOLE A CORE 17X CORED INTERVAL 1 5 1 . 0 - 1 5 6 . 7 mbsf 754A-17X

-

1úa•~

IAN

i—ioEtoLu<

orLU

O

BICF0

<IF

ER

S

3α:

°P

/Pro

en

2.ε

1

(0

αj

c>

STRAT. ZONE/

i S I L CHARACTER

3S

SIL

S

|

z

z

A/M

•<tCM

αo

1áO

2

C

CQ

CO

AG

NE

TI<

2

IE!

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PE

RI

s»LU

JOU

ow

cc

2

=

GRAPHICLITHOLOGY

1

G

DIS

T)

LIN

r

2

RU

CTU

R

w

«2


CHERTY GRAVEL

Core is heavily disturbed.

Major lithology: CHERTY GRAVEL. Variable colored pebbles and gravels over the first 17cm composed primarily of chert. Fragments are well sorted by the [drilling process], averagesize is 5 mm. Lower 5 cm of core is composed of a gravels and pebbles interspersed indisturbed gray (5Y 5/1) calcareous sediment.

S1 It

UN

IT

IME

-RO

CK

•IA

NM

AE

ST

RIC

H1

LO

WE

R

7 5 4BIO

m

FO

RA

MIN

IFE

Fno

dat

a

STRAT.

m

NA

NN

OF

OS

SI

e>

CC

24

c/>

RA

DIO

LA

RIA

N

HOLEZONE/

DIA

TO

MS

Ba

rre

n

A

TIC

SP

ALE

OM

AG

NE

en

RT

IEP

HY

S.

PR

OP

CH

EM

IST

RY

CORE

SE

CT

ION

CC

ME

TE

RS

-

18X CORED INTERVAL 1 5 6 . 7 - 1 5 9 . 8 mbsf

GRAPHICLITHOLOGY

JTU

RD

RIL

LIN

G

Dl

a

SE

O.

ST

RU

CT

J

SA

MP

LE

S

*


CALCAREOUS CHALK WITH NANNOFOSSILS.

The core is heavily disturbed by drilling.

Major lithology: CALCAREOUS CHALK with NANNOFOSSILS. Chalk biscuit is light greenishgray (5GY 7/1) with laminations partially obscured by mottling. Pebble and gravel size chertfragments (possibly the result of downhole contamination) surround the chalk biscuit.

SMEAR SLIDE SUMMARY {%):

CC, 10D

TEXTURE:

Sand 5Silt 90Clay 5

COMPOSITION:

Micrite 80Nannofossils 15Spicules Tr

754A-18X 754A-19N

SITE 754 HOLE A CORE 19N CORED INTERVAL 159.8-160.5 mbsf


CALCAREOUS CHALK WITH NANNOFOSSILS

The core is moderately to heavily disturbed.

Major lithology: CALCAREOUS CHALK with NANNOFOSSILS. Greenish gray (5GY 7/1)drilling biscuits with distinct grayish green (5G 5/2) laminations. Subtle cross-bedding occur-in the interval between 17 and 31 cm. Faint mottling throughout the core. A 5 mm bleb ofpyrite occurs at 26 cm. Upper 12 cm of core contains cherty pebbles and gravels from downhole contamination.


TEXTURE:

SandSiltClay

COMPOSITION:

ForaminifersMicriteNannofossilsSpicules

I20-I25—

I30-

!40-I45-I50-

SITE 754 HOLE A CORE 2ON CORED INTERVAL 162.6-167.1 mDSf :


CALCAREOUS CHALK WITH NANNOFOSSILS.

The core is undisturbed.

Major lithology: CALCAREOUS CHALK with NANNOFOSSILS. Light gray (5GY 7/1) chalkid bluish gray (5B 5/1) and grayish green (5G 5/2) laminations that are frequently

disturbed by mottling. Cross-bedding and ibearing laminations occur through out the


in many places. Dark ash-

1, 85 2. 76 2,90 2, 120

TEXTURE:

COMPOSITION:

Clay

Micrite

SITE 754 HOLE A CORE 21N CORED INTERVAL 167.1-170.1 mbsfB I 0 S T R 4 T .FOSSIL CH


ndisturbed from 12 to 150 (

CALCAREOUS CHALK

The core is severely disturbed in the first 12 cm of Setin Section 2 the core is moderately disturbed.

Major lithology: CALCAREOUS CHALK, greenish gray (5GY 6/1) to light greenish gray (5GY7/1) in color. Laminae occur throughout, grayish green (5G 5/2, 5G 4/2) with extremes of

mish gray (5BG 5/1) in Section 1, 39, and 79 cm, as well as dark bluish gray (5B 4/1) inSection 1, 83 cm. These darker la

Minor lithology: Chert layer in Section 2, 7-10 err


1,24 1, 44D D

TEXTURE:

Sand 1 30Silt 84 10Clay 15 60

COMPOSITION:

Clay — 10Foraminifers 1 30Glass 1 TrGlauconite — TrMicrite 90 59Nannofossils 8 —

ased amounts of volcanic glass,

black (5Y 2.5/1) in

'• • • i " " "

i -

SITE 754 HOLE A CORE 22N CORED INTERVAL 170.1-171.1 mbsf

βlOSTRAT. ZONE/


CALCAREOUS CHALK

The entire core is severely disturbed.

Major lithology: CALCAREOUS CHALK, predominantly stark white (whiter than 10YR 8/1)with a very slight greenish tinge.

Minor lithology: Chert layer from 5-19 cm, black (5YR 2.5/1) in color.

754A-22J' 3N 1

SITE

I

754 HOLE A CORE 23N CORED INTERVAL 171.1-172.1 mbsf

BIOSTRAT. ZONE/

FOSSIL CHARACTER


CALCAREOUS CHALK

Undisturbed.

Major lithology: CALCAREOUS CHALK, predominantly light gray (5Y 7/1) laminated andmottled with dark greenish gray (5BG 4/1) laminae. Ash layers were noted at 17-26 cm, andat 65-75 cm. The ash layers have sharp basal contacts and grade upward.


Clay

COMPOSITION:

Dolomite

ForaminifersGlassMicriteNa ofossils

5Hio-jI5H

20-12 5 -

3 0 -

3 5 -

40-;

45~j

50-1

Of\

6 5 ^

7 0 -

75™

8 0 -

85™

9 5 -

100—

105™

U 0 •

i l f t

if a

J 2 0 -

]

135—

I4θ£145-

150-

SITE 754 HOLE B CORE 2R CORED INTERVAL 122.7-132.3 754B-2R 754B-5R

TIM

E-R

OC

K

UN

ITU

PP

ER

E

OC

EN

E

BIOSTRAT. ZONE/

FO

RA

MIN

IFE

RS

PI

5

C/

P

NA

NN

OF

OS

SIL

SC

P1

5b

A

/M

RA

DIO

LA

RIA

NS

DIA

TO

MS

Ba

rre

n

PA

LE

OM

AG

NE

TIC

SI

Ind

eter

min

ate

PH

YS

. P

RO

PE

RT

IES

CH

EM

IST

RY

SE

CT

ION

1

ME

TE

RS

GRAPHICLITHOLOGY

DR

ILL

ING

O

IST

UR

B.

i

SE

O.

ST

RU

CT

UR

ES

j

»F•i

SA

MP

LE

S


CHERTY SAND AND GRAVEL

Core is moderately disturbed

Major lithology: CHERTY SAND and GRAVEL. Upper 20 cm of core consists of a (10YR 6/8) brownish yellow sand which fines upward from very coarse sand to very fine sand. Thelower 15 cm consists of yellowish brown (10YR 5/4) pebbles and cobbles composed of chert,limestone and shell fragments. Although graded bedding appears continuous over the wholecore it should be noted that the sand unit and the pebbles and cobbles were separated byseveral meters in the original liner. "The Weissel Beach section, NJ."

srrε

I

7 5 4 HOLE B CORE 5R CORED INTERVAL 1 5 1 . 7 - 1 6 1 . 3 mbsf

ON

BIOSTRAT. ZONE/


CALCAREOUS CHALK


Major lithology: CALCAREOUS CHALK. Drilling biscuits of hard greenish gray (5G 6/1,7/1)chalk containing mm-scale planar and cross-bedded light gray (5G 7/1) to dark greenish gray(5G 4/1) laminae. Several dark bluish gray (5B 4/1) ash-bearing layers 2-4 cm thick occur inSections 1 -3. Core is slightly bioturbated and mottled. Many mottles contain pyrite.

= 1 SMEAR SLIDE SUMMARY (%):

Clay

COMPOSITION:

GlassMicriteNannofossilsSpicules

5

10

1 5 A2 OH

30- j35H

4 0 -

4 5 -

5 5 -

60 :

z

DO

7 0 ^

7 5 -

8 0 -

O v)

90™

9 5 -100-

105-I I ΛH U ]

115-

120-

1 2 5 -

130—

135—

1 4 0 :

145-

150-—

I

j

iMiii•m

_

—

—

_

I _—

—

j —

—i

—

15-2 0 -

3 0 -

3 5 -

40 :

4 5 -

556 0 -ß t;

7 0 -7 5 -8 0 -8 5 -

90 :-9 5 -100-105-110-

——

_

115-

120-

125 -

130-

135-

140—

1 4 5 -

150^

ON

SITE 7 5 4 HOLE B CORE 6R CORED INTERVAL 1 6 1 . 3 - 1 7 1 . 0 mbsfBIOSTRΛT. ZONE/

754B-6R 1 2 3 CC


CALCAREOUS CHALK


Major lithology: CALCAREOUS CHALK. Drilling biscuits of hard greenish gray (5GY 5/1) andwhite (1OYR 8/1) chalk containing mm-scale planar and cross-bedded light gray (5G 7/1) I.dark bluish gray (5BG 4/1) laminae. Core is slightly bioturbated and mottled. Some of themottles contain pyrite. The darker intervals contain up to 7% ash Chert fraαment at 15 cmthe CC.


Clay

COMPOSITION:

QuartzSpicules

SITE 754 HOLE B CORE 7R CORED INTERVAL 171.0-180.6 mbSf

BIOSTRAT. ZONE/

GRAPHICLITHOLOGY

= # ,


CALCAREOUS CHALK

Core is slightly disturbed

Major lithology: CALCAREOUS CHALK. Alternating sequences of light intervals, generallylight gray (5Y 7/1) and white (1OYR 8/2), with darker intervals, generally greenish gray (5GY6/1, 5G 4/1). Laminae (mm-scale) are common throughout the core. Darker intervals contairup to 8% ash and have more undisturbed laminae. Lighter intervals exhibit more mottling.Burrows are often filled with pyritβ or chert. Microfaults occur in Sections 3 and 6.

Minor lithology:

a. Volcanic ash with micrite. Section 1, 73-84 cm. Dark greenish gray (5GY 4/1) and feature-

b. Chert. Thin 1 cm layer of dark gray (2.5YR 4/1) chert in Section 6 19-20 cm.


1,15 1, 77

TEXTURE:

SiltClay

COMPOSITION:

ApatiteFeldsparGlassGlaucoπiteMicrite

OpaquesQuartzRock Fragment

D M M3, 30D

— 60 - —

5

I0

5

20

25

30

35

40-

45

50

55

60

65

70

75

80

85

90

95

100

105

110

115120

125

130

135

140

145

150

ooSITE 754 HOLE B CORE 8R CORED INTERVAL 180.6-190.3 mbsf

BIOSTRAT. ZONE/FOSSIL CHARACTER

754B-8F

L1TH0L0SIC DESCRIPTION

CALCAREOUS CHALK

Material recovered above the chert layer is undisturbed to slightly disturbed, incompleterecovery below the layer.

Major lithology: CALCAREOUS CHALK. Alternating shades of white and light gray (5Y 8/1, N71, 5Y 7/1, 5GY 7/1) with light greenish gray and greenish gray (5G 7/1, 5G 4/2). Darkerintervals have higher ash content; up to 5% at Section 1, 136 cm. Horizontal and wavygreenish laminae are occasionally cross-bedded. Microfaults and de-watering structures aalso observed. The core catcher contains Inoceramus fragments.

Minor lithology: Chert, Section 2, 30-35 cm, light gray (5Y 7/1) and dark gray (N4) in colorcontaining foraminifer ghosts.


Clay

COMPOSITION:

SITE 754 HOLE B CORE 9R CORED INTERVAL 190.3-200.0 mbsf

LIMESTONE

Undisturbed.

Major lithology±IMESTONE, light greenish gray (5G 7/1) to dark greenish gray (5G 4/1) withmottles, bioturbation, and laminations throughout core. Shell fragments in Sections 1-2.Microfracture in Section 2, 95 cm. Incipient stylolite seams, traces of pyrite, and ash occurthroughout core. Chert, olive gray (5Y 4/2), in Section 6, 92-95 cm, with foraminifer ghosts.

Minor lithology: Volcanic ash in Section 6, 103-106 cm.


2,82 6,107D M

TEXTURE:

Silt 80 85

Clay 20 15

COMPOSITION:

Apatite Tr —Calcite Tr —Glass 3 94Micrite 90 3Nannofossils 5 2Opaques Tr 1Plagioclase — TrPyroxene — TrQuartz 1 Tr

SITE 754 HOLE B

BIOSTRAT. ZONE

CORE 1 OR CORED INTERVAL 2 0 0 - 2 0 9 . 6 mbsf

IItoIImtoIItoII

754B-10R 1


LIMESTONE

Undisturbed.

Major lithology:LIMESTONE, dark greenish gray (5G 4/1) to light greenish gimottled and bioturbated.Laminae range from inclined.to wavy to horizontal.Ircross-bedding occurs at 42 cm, and a micro-fault is centered at 100 cm. She(Iπocθrsmus?) occur throughout th© core.


COMPOSITION:

ay (5G 7/1),i Section 2,

SITE 754 HOLE B CORE 11R CORED INTERVAL 209.6-219.2 mbsf 754B-11R 1BIOSTRAT. ZONE/

1 FOSSIL CHARACTER

GRAPHICLITHOLOGY


LIMESTONE

Undisturbed.

Major lithology: LIMESTONE, dark greenish gray (5G 4/1) to light greenish gray, moderatelyto heavily mottled and bioturbated. Wavy to sub-horizontal laminae. Thick (3-4) mm-sized(Inoceramus?) shell fragments, often recrystallized, occur throughout the core, concentratedin discrete beds. The darker layers have higher ash concentrations. Gray (N4/) chertpebbles, occur in the core catcher.


2, 85 CC, 1

Clay

COMPOSITION:

SITE 7 5 4 HOLE B CORE 1 2R CORED INTERVAL 2 1 9 . 2 - 2 2 8 . 9 mbsf

CC

LITHOL00IC DESCRIPTION

Undisturbed.

Major lithology: LIMESTONE, dark greenish gray (5G 4/1) to light greenish gray, moderatelyto heavily mottled and bioturbated. Wavy to subhorizontal laminae. Thick (3-4) mm-sized(Inoceramus) shell fragments, often recrystallized, occur throughout the core concentrated indiscrete beds. The dark layers have higher ash concentrations.


COMPOSITION:

Calcareous FragmentsForaminifers

CC

754B-12R

SITE 754 HOLE B CORE 13R CORED INTERVAL 228.9 - 238.5 mbsfBIOSTRAT. ZONE/

FOSSIL CHARACTER

GRAPHIC

LITHOLOGYLITHOLOGIC DESCRIPTION

The core is undisturbed.

Major lithology: LIMESTONE, dark greenish gray (5BG 4/1) to light greenish gray (5G 7/1),moderately to heavily mottled and bioturbated. Wavy, sub-horizontal or horizontal laminaeare 1 mm thick and usually darker than the surrounding mottled matrix. Pyrite blebs and shellfragments, (Inoceramus ?) occur throughout the section.

Minor lithology: Volcanic ash, occasionally present in significant amounts, enough to darkenthe sediment to dark blue gray (5B 4/1).

754B-13R

ISH

I OH

!5H

2 OH

25H

35H

4 0 J45H

5 5 -

e o : :

6 5 -

7 0 -

7 5 -QΛ

ÖU

8 5 -9 0 -

I00-IΛClUv

n o -ijg

I20-

• L v

130-

135-

• 0 :

. 4 5 -

150-

1mm

i

i

cc

:

SITE 754 HOLE B CORE 14R CORED INTERVAL 2 3 8 . 5 - 2 4 8 . 2 mDsf 754B-14RBIOSTRAT. ZONE/FOSSIL CHARACTER

CC

GRAPHICLITHOLOGY


LIMESTONE

The core is moderately to ; erely fractured.

Major lithology: LIMESTONE, dark greenish gray (5BG 4/1) to light greenish gray (5G 7/1),moderately to heavily mottled and bioturbated. Wavy, sub-horizontal or horizontal laminaeare 1 mm thick and usually darker than the surrounding mottled matrix. Pyrite blebs and shelfragments [Inoceramus?) occur throughout the section.

Minor lithology: Volcanic ash, occasionally present in significant amounts, enough to darkenthe sediment to dark blue gray (5B 4/1).


3,80 3,147 3,148

SandSiltClay

COMPOSITION:

BioclastClayFeldsparForaminifersGlassMicriteNannofossils

— — 10

— 10 —

SITE 754 HOLE B CORE 15R CORED INTERVAL 248.2-257.9 mbsf I5R 1

BIOSTRAT. ZONE/

FOSSIL CHARACTER

q -

GRAPHICLITHOLOGY


Moderately disturbed.

Major lithology: LIMESTONE, dark greenish gray (5BG 4/1) to light greenish gray (5G 7/1)moderately to heavily mottled and bioturbated. Wavy, subhorizoπtal or horizontal laminae are1 mm thick and usually darker than the surrounding mottled matrix. Pyrite blebs and shellfragments occur throughout the section.

Minor lithology: Volcanic ash, present in amounts sufficient to darken the sediment to bluishgray (5B 5/1) in some intervals.


Clay

COMPOSITION:

ApatiteGlassMicriteQuartz

70 —25 95

5H

I50

SITE 754 HOLE B CORE 1 6R CORED INTERVAL 257.9-267.6 mbsf 754B-16R CC

S.


Moderately disturbed.

Major lithology: LIMESTONE, predominantly light gray (5Y 7/1, 6/1) and white (2.5Y 8/0).Faint laminae appear in some of the darker sections but are generally overprinted bymottling. The lighter zones are heavily bioturbated.

Minor lithology: Chert. Very dark greenish gray (10Y 3/1) to gray (5G N/6). When notfragmented the chert exhibits sharp and wavy contacts with the limestone. Distinct layersoccur in Section 2, 10-20 cm, 91-94 cm, and 100-104 cm; in Section 3, 40-47 cm, 72-90 en106-115 cm and 120-130 cm.


COMPOSITION

CementQuartz

8 m

NJO

SITE 7 5 4 HOLE B CORE 1 7R CORED INTERVAL 2 6 7 . 6 - 2 7 7 . 3 mbSf 754B-17R

TIM

E-R

OC

K

UN

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PP

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AM

PA

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MA

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TR

ICH

TA

IN

BIOSTRAT. ZONE/

FO

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MIN

IFE

RS

C/P

G

t.

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-

G.

ga

nss

eri

NA

NN

OF

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SF

/P

CC

23

-22

1 R

AD

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AR

IAN

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LIMESTONE

The core is moderately disturbed and highly fractured in the core catcher.

Major lithology: LIMESTONE, predominantly light gray (5Y 7/1, 6/1) and dark greenish gray(5GY 5/1). The darker zones are the most pronounced in Section 1, 46-60 cm, and Section2, 13-92 and 139-150 cm. Very faint mottling is present and the core is slightly to moderatelybioturbated.

SITE 754 HOLE B CORE 18R CORED INTERVAL 277.3-287.0 mbsf

BIOSTRAT. ZONE/

FOSSIL CHARACTER

cc

I


LIMESTONE

The core is undisturbed and highly fractured in the core catcher.

Major lithology: LIMESTONE, gray (5Y 6/1) with gray {GLEY N6, N5) mottles. Greenish graylaminae (5G 6/1) are observed in Section 1. 89-95 cm. Shell fragments of Inoceramus werenoted in Section 1, 63, 95, 110 and 120 cm, and in Section 2 from 15-16 cm. The core ismoderately bioturbated.

Minor lithology: Chert layers of very dark gray (2.5Y N3) dark greenish gray (5GY 4/1) occurin Section 1, 75 and 145 cm, and in Section 2 from 8-10 cm. respectively. Black (7.5YR N2)chert pebbles occur in the core catcher.


SandSiltClay

COMPOSITION:

ForaminiferMicriteNannofossilsQuartz

SITE 754 HOLE B CORE 1 9R CORED INTERVAL 287.0-296.7 mbsf

TIM

E-R

OC

K

UN

IT

BI0STRAT. ZONE/

FO

RA

MIN

IFE

RS

NA

NN

OF

OS

SIL

S

RA

DIO

LA

RIA

NS

DIA

TO

MS

Ba

rre

n

PA

LE

OM

AG

NE

TIC

S

<D (

<O '

Ė >03

•σc

CH

EM

IST

RY

•

58.7

SE

CT

ION

1

2

ME

TE

RS

0.5-

1 .0-

GRAPHICLITHOLOGY

HH

HH

HH

H

k A A A

A A A A

k A A A

A A A A

A A A A

A A A A

k A A A

VOID

DR

ILL

ING

D

IST

UR

B.

SE

D.

ST

RU

CT

UR

ES

®

SA

MP

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#

#


CHERT

The core is highly fractured.

Major lithology: CHERT, black (2.5Y 2/0, or N2) with some gray to light gray (2.5Y 6/0. and 7/0, or N6 and N7) chalcedony veins about 2 mm thick. Rare vugs are lined with white or blackquartz microcrystals. Chert piece at Section 2, 25 cm has an exposed vein surface coveredwith chalcopyrite.

Minor lithology: Limestone, light gray (5Y 6/1) in color. Horizontal streaks are secondarydissolution seams, not primary laminae.


1,16 2,12D D

COMPOSITION:

Cement — 1Micrite 5 —Quartz 95 99

754B-18R J

5™

iö

zoz

-J

30™

35-

40-

45

50

55

60

65

70-

75

80

85

90

95-

100-

105

no115

120125130

135—140145150

754B-19R

X

S I T E

éM

E-

RO

CK

•~

l _Xo

:ST

RI

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ce

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7 5 4

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STRAT.

HOLE

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SIL CHARAC

0)

NN

OF

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(N

C">(NOO

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LL

w

DIO

LA

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B

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7.51

b

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°

• 3

2.0

CORE

CT

ION

<"

1

TE

RS

2

-

0.5-

-

:

-

20R CORED INTERVAL 296.7-306.3 mDsf

GRAPHIC

LITHOLOGY

1 ' i ' L-1-

VOID

A A

A A A

A A

A A A

ST

UIL

LIN

G

Dl

Q

\

/

\

i

0.

ST

RU

C1

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m

m

a


LIMESTONE AND CHERT

The core is highly fractured.

Major lithologies:a. LIMESTONE, light greenish gray (5GY 7/1) and gray (N6) in color. Fragments of darkerchips, greenish gray (5GY 5/1) occur in Section 1, 73-75 cm. Inoceramus fragments occur ir,

and mottles are seen in Section 2. Microfaults contain sub-millimeter calcite veins. A lime-stone pebble in Section 2, 17 cm shows sharp sedimentary contact.b. CHERT: black (N2 or 2.5Y 2/0) with thin light gray (N7) chalcedony veinlets to 1 mmthickness. A piece in Section 1 has gray "tree ring" like laminations.

754B-20R

si rε

UN

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K

3

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Z

Hü

TR

1A

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ex.

LO

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<—

D-

CCLU0 .

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7 5 4 HOLEBIOSTRAT. ZONE/

MIN

IFE

Rs

sser

gan

<t>

m

<bQ>

Q_

O

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SIL

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-22

CO

<_>

CL

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m

3L

AR

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<

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u<ooü

B

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s

12

et.

ind

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71

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25

.0

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CORE

ON

u

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1

2

o>

2

I

0.5-

-

2 1 R CORED

GRAPHIC

LITHOLOGY

i •: • : ' :

ü i i i ü1 1 ' i ' i '

1 1 •

—i—'—r

A A A

A A A

A A A

A A A

A A A

D

.IN

G

Dl

IL

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</

}

<;

>

INTERVAL 3 0 6 . 3 - 3 1 6 . 0 mbsf

>

$

•

Φ

LES

2

*


LIMESTONE AND CHERT

The core is highly fragmented.

Major lithologies:a. LIMESTONE, gray (5Y 5/1) to olive (5Y 4/3) in color. The limestone is weakly laminatedand mottled. Microfaults, fractures, and calcite and silica-filled fractures are common inSection 1.b. CHERT, black (5Y 2.5/1, 5Y 2.5/2) is present in discrete layers. In Section 1 chert ispresent at 10-15, 65, and 128 cm. It appears as a biscuit, often with a limestone rind on oneside. In Section 2 chert is present from 0-3, 20-60, and 83-88 cm. Light gray (N7) chalcedonyveinlets are observed.


2, 19 2,47D D

TEXTURE:

Sand 5 —Silt 85 —Clay 10 —

COMPOSITION:

Accessory Minerals Tr —Dolomite 15 —Foraminifers Tr —Glass Tr —Micrite 80 —Nannofossils Tr —Quartz Tr 95Spicules — 5

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LIMESTONE, CHERT AND DOLOMITE

The core is highly fragmented.

Major lithology: LIMESTONE, olive gray (5Y 5/2), very faint wavy laminations.

Minor lithology:a. Chert, black (N2), veinlets and coatings of chalcedony, rare vugs. Occasional shell

b. Dolomite, olive gray (5Y 5/2), large rhombs replacing limestone. Pieces show "sugary"surface texture. Rhombs are 50 to 90% of the rock.


1. 41M

COMPOSITION:

Glass 10Micrite 40Quartz 50

754B-22R 1

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*LITHOLOGIC DESCRIPTION

CHERT

The core is highly disturbed.

Major lithology: CHERT. Pebbles and cobbles 3-7 cm in diameter ranging in color from black(N2) to dark bluish gray (5B 4/1). Carbonate coatings occur on many of the pebbles. Twolight gray pebbles (5Y 7/1) at 10-11 cm.


1, 15D

TEXTURE:

Sand 15Silt 85

COMPOSITION:

Chert 100Micrite Tr

754B-23R

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LIMESTONE AND CHERT.

The core highly disturbed.

Major lithology: LIMESTONE and CHERT. Layers of olive gray (5Y 5/2) limestone pebblesand cobbles (2-8 cm in diameter) containing faint laminae and shell fragments (Inoceramus)interbedded with black (N2, and dark bluish gray (5B 4/1) chert pebbles and cobbles 3-7 cmin diameter. Limestone faintly mottled.


1.47D

COMPOSITION:

Quartz 95Radiolarians 4Spicules 1

754B-24R

SITE 754 HOLE B CORE 25R CORED INTERVAL 3 4 5 . 0 - 3 5 4 . 7 mbsf 754B-25R

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LIMESTONE AND CHERT

The core is highly disturbed.

Major lithology: Limestone and chert.Layers of olive gray (5Y 5/2) limestone pebbles andcobbles (2-8 cm in diameter) containing faint laminae and shell fragments (Iπocβramus)interbedded with black (N2) and dark bluish gray (5B 4/1) chert pebbles and cobbles 3-7 cmin diameter. The limestone is faintly mottled.


1, 55D

COMPOSITION:

Calcite 5Quartz 90Radiolarians 5

ocean drilling program initial reports volume 121 · site 754 holcoree 1 ah cored interval 0-6.1...

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