SITE 742 HOLE A CORE 1R CORED INTERVAL mdsf 742A 1R

Transcription

1 SITE 74 HOLE A CORE 1R CORE INTERVAL msf 74A 1R LITHOLOOIC ESCRIPTION IATOM OOZE and IAMICTON Majr lithlgies: a. iatm ze, live (Y 3), hmgeneus. b. iamictn (clayey silt with diatms and <10% gravel), dark greenish gray (G 41) t gray (Y 41). Rck clasts predminantly metamrphic and up t 40 mm in length (n the average mstly < 10 mm). rilling disturbance: Sediment highly disturbed and especially in Sectin 1 supy. 1, 1, 110, 1 M _ - Access, minerals Bitite iatms Framinifers Garnet Mica Plant Pyrxene Radilarians Silictlagellates Spicules Spinel Zircn _ _ _ 30 40

2 SITE I ROCK TIME- >- (Y< z a. Lü i < z> Lü z Lü LIOC a. cr Lü Q. Q. Z> 74 HOLE CO NIFEF FORAMI C c> NANNOF OSSII CO RAIOLAR^ C IATOM - L_ α. tr INO- FLAGEL LATE CO n Id ERTI PROP PHYS. TRY CHEMIS O -: 77 >* <J CORE 1SECTIO METERS R CORE INTERVAL mbsf m STUF Q RILLir 1 TRUC1 URE m σt SAMPLE IAMICTON and IAMICTITE Majr lithlgies: LITHOLOGIC ESCRIPTION a. iamictn (clayey silt with sand and minr gravel and sme diatms), dark gray (Y 41), hmgeneus, sft Sectin 1, 0-90 cm. Average gravel cntent is %. Mst f the clasts are <1 cm in diameter, the largest is 3 cm. The larger clasts are subrunded and include gneiss, granite, vein quartz and weathered sandstne. The clasts are randmly distributed thrughut the cre and have n preferred rientatin. b. iamictite, as abve, but much harder, very firm; Sectin 1, cm. rilling disturbance: The cre is very defrmed in the upper part, therwise it is mderately defrmed. 1, Access, minerals Amphible 3 1 iatms 10 Garnet Mica Pyrxene Radilarians 70* 0- ^ * HO US 10 I i30 I3 140!4 I0

3 SITE 74 HOLE A CORE 3R CORE INTERVAL mbsf ->s> I.O-KT :^j ^ ^ ^ ^ LITHOLOGIC ESCRIPTION Majr lithlgy: iamictite (sandy silt with minr gravel), very dark gray (Y 31), hmgeneus, massive, structureless. The diamictite is firm, cmpacted but friable. The average gravel cntent is arund 1% thrughut the cre. The clasts are mstly <1 cm, the largest being 7 cm. Clast rundness analysis indicates 1% angular, 36% subangular, 48% subrunded and 4% runded clasts (sample size 0). They include garnetiferus gneiss, quartz-feldspar gneiss, amphiblite, quartz, feldspar, granite, very minr sandstne. Access, minerals Amphible iatms Garnet Mica Pyrxene A-3R. 00 -J I00» !

4 Is) SITE 74 HOLE A CORE 4R CORE INTERVAL mbsf LITHOLOGIC ESCRIPTION Majr lithlgy: iamictite (sandsiltclay with minr gravel), black (Y.1), hmgeneus, massive, structureless. The diamictite is firm, cmpacted but triable. The clasts are mstly <1 cm, the largest being 6 cm acrss. Clast rundness analysis indicates 19% angular, 3% subangular, 38% subrundedand 8% runded clasts (sample size 6). They include quartz, feldspar, quartz-feldspargarnet gneiss, quartz-feldspar-garnet-bitite gneiss, granite. Average gravel cnt< ;πt: Sectin 1: 0-0 cm, i% 0-0 cm, 1% 0-83 cm, % rilling disturbance: The clast at tp f the cre is pssibly cave i 1, 40 Access, minerals Amphible Garnet Mica Pyrxene SITE 74 HOLE A CORE R CORE INTERVAL mbsf TIME-ROCK UNIT BIO FOS < STR SIL ione RAIOLARIANS. 1 > RAC t- < ER PHYS. PROPERTIES CHEMISTRY SECTION METERS RILLING ISTURB. SE. STRUCTURES SAMPLES LITHOLOGIC ESCRIPTION cc _ * IAMICTITE Recvery restricted t 1 cm in the cre catcher, cnsisting f tw pebbles f banded quartz-feldsparbititegarnet gneiss (6 cm and 4. cm) and sme highly disturbed relicts f black (Y.1), massive, hmgeneus diamictite (sand-silt-clay) which cntains abut 3% gravel <1 cm in diameter. CC, Access, minerals Amphible 1 3 Garnet Mica Pyrxene 0

5 SITE 74 HOLE A CORE 6R CORE INTERVAL mbsf t ME-ROCK U >- QUATERNAR FO RAMINIFERS NANNOFOSSILS RA IOLARIANS TOMS CL PA LEOMAGNETIC YS. PROPERT s O - > * CHEMISTRY 0.3 CTION M TERS Z 1 1 IRB.. STRUCTUR MPLES < LITHOLOGIC ESCRIPTION IAMICTITE, METAMORPHIC BOULERS and GRAVEL a. iamicti e, hmgeneus, black (Y.1) with abut 3% f gravel, b. Metam phic bulders and pebbles, up t 60 mm in size, cnsisting f higheiss and grade gn granulite. rilling dis urbance: The gneiss c clasts were cmpletely islated frm matrix. Lü z IOCE _i ü. cr UPPE SITE 74 HOLE A CORE 7R CORE INTERVAL mbsf TIME-ROCK UNIT FORAMINIFERS NANNOFOSSILS RAIOLARIANS IATOMS INO- FLAGELLATE rn C CO PALEOMAGNETICS PHYS. PROPERTIES CHEMISTRY SECTION cc METERS RILLING ISTURB. SE. STRUCTURES SAMPLES LITHOLOGIC ESCRIPTION METAMORPHIC PEBBLES and BOULERS Majr lithlgy: Metamrphic pebbles and bulders, pebbles and drilled prtins f high-grade metamrphic quartzites and gneisses. ^

6 SITE 74 HOLE A CORE 8R CORE INTERVAL.-6.1 mbsf 3IOSTRAT. ZONE 74A-8R 1 LITHOLOGIC ESCRIPTION IAMICTITE, METAMORPHIC BOULERS and PEBBLES Majr lithlgy: iamictite, hmgeneus, very dark grey (Y 31), with abut 3% Metamrphic bulders and pebbles (Sectin 1, 0-10 cm), f gneiss granulite, up t 60 mm in size. cc SITE 74 HOLE A CORE 9R CORE INTERVAL mbsf ME-ROCK U BIOSTRAT. FOSSIL RAMINIFERS " m NNOFOSSILS z 'ONE CHARACTER IOLARIANS α ATOMS C MO- AGELLATE QJL C LEOMAGNETIC YS. PROPERT - "- EMISTRY CTION w TERS s 0.- ILLING ISTs _l L m. STRUCTUR a, MPLES IAMICTITE LITHOLOGIC ESCRIPTION Majr lithlgy: iamictite, very dark grey (.G 30), cmpsed f 3% gravel and equal sand siltclay. Clasts are up t 4 mm size. >* r-

7 SITE 74 HOLE CORE IME-R!OCK Ul *~ IFERS < INNOFCISSILS IIOLA RIANS ATOMS VLEOMJGNETIC HYS. P ROPER! z α HEMIST Ad, :CTION CTERS 10 OR CORE INTERVAL mbsf LITH0L0GY IILLINI3 ISTl :. STIRUCTUR imples 10 LITHOLOGIC ESCRIPTION 74A-10R tr. C. altui, frmsus.^ <n <b <s t3 CC CL C (Z C ^ " >* Φ n act > * OC 0.3 icaco. TOCO.37 3= mm I IAMICTITE Majr lithlgy: iamictite, dark gray (Y.1) t very dark greenish gray (.G 30), relatively hmgeneus, with clasts up t 70 mm, predminantly f metamrphic rigin; gravel cntent estimates range frm t 10%. rilling disturbance: Sediment slightly t mderately disturbed.

8 SITE 74 HOLE A CORE 1 1R CORE INTERVAL mbsf,_ ROCK CO FORAM INIFEI CO USSOd ONN<TN 1 CL O CO w C t Q. <t> 0 L^ ò ε CC ufa 0 * CO RAIOL.ARIAr CO IΛTOI CO C c S3 PROP ERTI PHYS. in 01 c^ c-> >* CHEMI!3TRY O O jç IΛ z 1SECTI< O <J <J O CN CM >i 3 CC METER TIME- -* _ I - CO STUI NG l RILLI s sanj SE. ITRUCl CO SAMPL * OG IW IAMICTITE LITHOLOGIC ESCRIPTION Majr lithlgy: iamictite (sand-siltclay with minr gravel), black (Y.1), massive, structureless and hmgeneus, except fr slight fluctuatins in sand and gravel cntent. Cmpacted but friable. Clasts are mainly <1. cm in diameter, the largest reaching 8X4 cm. Clast rundness analysis indicates: 8% angular, 46% subangular, 40% subrunded,6% runded (samples size 0). The clasts include quartz-feldsparbitite gneiss, granite, vein quartz, granulite, amphiblite and minr black caly shale and cal. Average gravel cntent: Sectin 1: 7% Sectin : Sectin 3: 1-0% (shrt sectin) CC: 10%. 1,80, CC CC 0. 0 ^0 0 Access, minerals Amphible Garnet 1 Mica 1 Micrite 1 1 Pyrxene SITE 74 HOLE A CORE 1 R CORE INTERVAL mbsf TIME-ROCK UNIT BI0STRAT. ZONE FORAMINIFERS ü NANNOFOSSILS RAIOLARIANS IATOMS CO PHYS. PROPERTIES CHEMISTRY SECTION CC METERS RILLING ISTURB. SE. STRUCTURES SAMPLES IAMICTITE LITH0L0GIC ESCRIPTION Majr lithlgy: iamictite, black (Y.1), drilling breccia with clasts f granite and quartzite up t 4 cm.

9 SITE UNIT TIME-ROCK 74 HOLE CO FORAMINIFE 00 m NANNOFOSSI t eticula cc α. m RA10LARIAH IATOMS C PALEOMAGNE TICS A ERTIES PROP PHYS. Λ >* CHEMISTRY 0.41 CORE 1SECTION METERS 13R CORE INTERVAL mbsf RILLING l STURB. ms_l 0. URES SE. STRUC *SAMPLES IAMICTITE LITHOLOGIC ESCRIPTION Majr lithlgy: iamictite (sandsilt-clay with gravel), black (Y.1), massive, structureless and hmgeneus, except fr slight fluctuatins in sand and gravel cntent. Cmpacted but friable. Clasts are mainly <1 cm in diameter, the largest reaching 6X cm. Mst clasts are subangular t subrunded. The clasts include augengneiss, garnetiferus gneiss, quartz-feldspar-bitite gneiss, amphiblite, granite, quartz, feldspar, carbnate-cemented sandstne. The average gravel cntent is arund 1%. SMEAR SLIE SUMMARY <%): 1, Access, minerals Amphible 3 1 Garnet 1 Mica Micrite Pyrxene A-13R i_ IO<H I0 I I30 I4C 10

10 SITE 74 HOLE A CORE 14R CORE INTERVAL mbsf 74A-14R, 1 TIME-I*OCK UNIT FORAMII\IIFERS CO NANNOFlOSSILS RAIOL<IRIΛNS m I IATOM! RP \ PΔLEOM,AGNETIC S J <J * PHYS. FROPERT *X r- -17% * # r- r >- CHEMIS1 S i-oo. i "i >* z 3 T 1 SECT^ METERS _ - SSfl i T \\i RILLING ISTLIRS RUCTURa i SAMPLE PP * * IW * IAMICTITE LITHOLOGIC ESCRIPTION Majr lithlgies: a. iamictite (sand-silt-clay with gravel), black (Y.1) t unnamed gray (.G 30), massive, structureless and hmgeneus, except fr slight fluctuatins in sand and gravel cntent. Cmpacted but friable. Sectin 1 t Sectin, arund 40 cm. b. iamictite, as abve but unnamed gray (10Y 31), and weakly t mderately well stratified, Sectin, arund 40 cm t Sectin 3, 87 cm. The stratificatin is n a cm-decimeter scale, generally diffuse but with a few sharp, but slightly disturbed bundaries; gravel and sand cntent varies markedly. The stratificatin in places is inclined t the hrizntal, with a suggestin f slumping in Sectin 3, 14-0 cm. Minr lithlgy: ey silt, dark greenish gray (BG 41) t dark bluish gray (B 41), Sectin, cm with sharp bundaries; and als a few bands in Sectin 3, 4-46 cm with diffuse bundaries. In the frmer is a pyrite-enriched band -7 mm thick and a slump. Clast rundness analysis indicates: 1% angular, 40% subangular, 34% subrunded and 14% runded. Clasts include pegmatite with quart, feldspar, magnetite and amphible; quartzite with granule t small pebble-sized grains, bitite-amphible mafic gneiss (fine-grained), altered bitite-gamet gneiss, altered quartzite and pegmatite. One small runded bitite-feldspar pebble has a weathering rind. The largest clast measures 3X6 cm. Average gravel cntent: Sectin 1: 10% Sectin : 0-8 cm, 10% 60-9 cm, 1-3% 9-99 cm, < 1 % cm, 10% Sectin 3: 3-% I I <> ;cac,9,117 3,60 M Access, minerals Amphible Carbnate Garnet Mica Pyrxene

11 SITE 74 HOLE A CORE 1 R CORE INTERVAL mbsf - TIME-I Lü Z UJ PLK cc Lü BIOSTRΔT. ZONE MIFERS FORAMI C NANNOF OSSILS z < I RAIOU > itei iwinç -*> < y TO C tr I IATOM! α. cr I PALEOMAGNETIC c > * <N O s >ROPERT I PHYS. 1 g <ji i O >> «% TT X p* ( > <- CM V > >- 1 CHEMIS 0 O O.I 4 CaC 1SECTI<^ 3 4 cc METERS ö^ lipp RILLING ISTURB. X \ \ \ * v l >: ^»i \ \ \ Θ \ 1 _L L ~v^ ^< W - Θ \ \ _L _L m RUCTURl i- Θ Θ x Δ i α * IAMICTITE LITHOLOβlC ESCRIPTION Majr lithlgy: iamictite (clayey silt with minr gravel and sand-silt-clay with minr gravel), black (Y.1) t unnamed dark gray (10Y 31), hetergeneus, weakly stratified but ccasinally sharply-bunded beds. Rapid changes in size classes ccur between diffuse clayeyer and gravelier hrizns. Several beds cntain siltstneclaystne intraclasts frm rippedup clast pr intervals beneath. These clayey layers ccur in Sectin, 3 cm and 11 cm, and Sectin cm. Minr lithlgies: a. stne, black (Y.1) t dark gray (.Y 40), prly t slightly srted. Occurring in Sectin 4, 0-0 cm and cm, sandstne beds cntain up t 60% rip-up clasts f underlying siltstne. Size grading ccurs, with carsetail grading in the upper unit. Inverse grading ccurs in Sectin 4, 90 cm. Cntacts are sharp and laded. The sandstne als cntains granules and pebbles. b. iatmite (abut 70% diatms), greenish gray (G 1) t unnamed gray (10Y 1). with weak planar stratificatin and disseminated quartz grains and intraclasts f less diatm-rich siltstne; Sectin 4, 0-1 cm. A slickensided fault ccurs in Sectin 4, 97 cm. Clasts in the diamictite have the fllwing rundness classes: angular 6%, runded 38%. They include fliated amphiblite, bitite gneiss, pegmatite with large magnetite crystals, vein quartz and mylnitized gneiss. The largest clast is cm in diameter. Average gravel cntent: Sectin 1: 1% Sectin : 1% Sectin 3: 3% Sectin 4: <1% rilling disturbance: At the end f each cre piece there is always sft, sandysilty clayey breccia. Larger pieces appear intact, but may have refrmed during drilling. This cmplicates the recgnitin f riginal sedimentary features. The whle cre was als cated in drilling mud ,30 M Access, minerals Amphible iatms Garnet Mica 7 Pyrxene Radilariaπs Silicflagellates Spicules ππ

12 SITE 74 HOLE A CORE 1 6R CORE INTERVAL mbsf 74A-16R LITHOLOGIC ESCRIPTION Majr lithlgies: a. iamictite, black (Y.1), weakly stratified, with strngly fluctuating sand cntent; Sectin 1, 0-17 cm, and cm. b. iamictite (sand-silt-clay with minr gravel), black (Y.1), massive, relatively hmgeneus, cmpacted but friable; Sectin 1, cm, and Sectin and 3. Clasts reach up t 60 mm diameter. Clast rundness analysis indicates: 1% angular, 3% subangular, 40% subrunded, 13% runded (sample size ). They are predminantly f gneiss and granulite. Hwever, ne clast f carbnate-cemented sandstne with a weathered rim als ccurs in Sectin, 80 cm. Frm Sectin 1, 90 cm, t Sectin, 17 cm, alignment f clasts with arund cm diameter each, cnsisting f strngly flded garnetbititeamphible gneiss, with nly very minr diamictite matrix. These clasts were prbably parts f ne large bulder. In Sectin, cm, the diamictite cntains micrite but des nt shw ther characteristics than the adjacent sediment. Minr lithlgy: ey siltstne, dark gray (Y 41), with < <1% gravel; Sectin 1, cm. The siltstne has a laded r scured tp and an irregular transitinal base. Average gravel cntent: Sectin 1: 0-17 cm, >0% cm, 1% cm, 9% Sectin : 0-17 cm, 9% cm, % Sectin 3, 0-4 cm, 7% rilling disturbance: In Sectin 1, 0-14 cm, a carbnate-cemented sandstne clasts ( cm diameter) and a gneiss clast (7 cm diameter) may be cave in. 1, M, 100 M Access, minerals Amphible Mica Micrite Pyrxene

13 SITE 74 HOLE A CORE 1 7R CORE INTERVAL mbsf 74A-17 LITHOLOGIC ESCRIPTION Majr lithlgy: iamictite (sand-silt-clay with minr gravel), black (Y.1), massive, hmgeneus, structureless, cmpacted but friable. Clasts are up t 6 cm diameter. Clast rundness analysis indicates: 16% angular, 33% subangular, 36% subrunded, 1% runded (sample size 67). Clasts include varius gneisses, vein quartz, feldspar grains, carbnate-cemented sandstne, sandstne, granite, cal (striated, bullet-nsed) and quartzite. Average gravel cntent: Sectin 1: % Sectin : 7% Sectin 3: 6% Sectin 4: % Sectin : 1-80 cm, 1% cm, % Sectin 6: % Sectin 7: % Access. Minerals Amphible Garnet Mica Pyrxene C J

14 SITE 74 HOLE A CORE 1 8R CORE INTERVAL mbsf LITHOL0GY LITH0L0GIC ESCRIPTION Majr lithlgy: iamictite (clayey silt with sand and minr gravel, sand-silt-clay with minr gravel), black (Y.1), massive, hmgeneus, structureless, cmpacted but friable. Tw znes with an bvius (acid test) micrite cntent ccur in Sectin, -7 cm, and Sectin 6, 9-11 cm. Clasts are mstly <1 cm in diameter, the largest is 3 cm in diameter. Clast rundness analysis indicates: 10% angular, 34% subangular, 40% subrunded, 16% runded (sample size 8). Clasts include quartz, feldspar, varius gneisses, vein quartz, sandstne, granite, and cal. Average gravel c intent: Sect n 1: % Sect n : 7% Sect n 3: 3-% Sect n 4: % Sect n : 3-% Sect n 6: 3% CC: 1-3% SMEAR SLIE SUMMARY (%) 3, Access, minerals Amphible Mica pyrxene

15 SITE 74 HOLE A CORE 19R CORE INTERVAL mbsf LITHOLOGIC ESCRIPTION Majr lithlgy: iamictite (sand-silt-clay with minr gravel), black (Y.1) and very dark gray (Y 31), massive, hmgeneus, structureless, cmpacted but friable. A zne with an bvius (acid test) micrite cntent ccur in Sectin 3, 7-87 cm. Clasts are mstly <1 cm in diameter, the largest is 3 cm in diameter. Clast rundness analyses in Sectins 1-3 and 4 indicate: 18 and 1% angular, 3 and 34% subangular, 3 and 4% subrunded, 1 and 9% runded, respectively (sample size 86 and 3). Clasts include quartz, feldspar, varius gneisses, vein quartz, sandstne, quartzite, granite, and cal. Average Sectin 1 Sectin Sectin 3 Sectin 4 Sectin Sectin 6 Sectin 7 ravel cntent: 3% 1-3% 1-3% 0-0 cm, -3% 0-40 cm, 3-% cm, -3 <% % % Access, minerals Amphibie Mica Micrite Pyrxene e^

16 è SITE 74 HOLE A CORE 0R CORE INTERVAL mbsf LITHOLOGIC ESCRIPTION Majr lithlgy: iamictite (sand-silt clay with minr gravel), black (Y.1), very dark gray (Y 31), grayish green (unnamed clrs 10GY 41, 10GY 10), dusky yellwish green (unnamed clr 10GY 31), very dark grayish brwn (Y 3), hmgeneus, massive, structureless. The diamictite is firm, cmpacted but friable. Gravel cntent is abut 3% thrughut the cre; clasts are mstly < 1 cm in diameter with the largest clast 3. cm in diameter. The clasts are predminantly subangular t subrunded and cmpsed f granite, varius f gneiss, quartz, feldspar, quartzite, diamictite, cal,and black amphiblite. Wisps f gray (Y 1) diamictite ccur in Sectin 1, 10 cm, 1-17 cm. A vague hrizntal clast fabric is discernable between cm, and a pyrite cncretinary structure in Sectin 3, 61-6 cm. Minr lithlgy: y clay, greenish gray (unnamed clr, 10GY 1), sft, prly cmpacted with ccasinal large sand grains, but n discernable grain size differentiatin. The lwer bundary is angular and sharp, whereas the upper ne is planar but mre diffuse. Sectin, 1-16 cm, 4-7 cm; Sectin 3, cm. rilling disturbance: Sectin 3, cm, mderately fractured. 1,70 1,140,8,0 3,0 3,60 M Mica Micrite Organic matter Pyrxene

17 SITE 74 HOLE A CORE 1R CORE INTERVAL mbsf U LITHOLOGIC ESCRIPTION Majr lithlgy: iamictite, (sand-silt-clay with minr grabel), dark gray (10Y 41), hmgeneus, massive, structureless. The diamictite is firm, cmpacted but friable. The gravel cntent ranges frm 1-3%, but is nly 1% in Sectin 3. Mst clasts are <4 mm in diameter with a maximum diameter f 6 mm. The majrity if clasts are subrunded t subangular and cmpsed predminantly f quartz, quartzite, granite, gneiss, amphible and cal. A greenish-black layer abut 1cm thick ccurs in Sectin 1, 7-76 cm; its clr is due t a green clay mineral (-10%) wich may be glaucnite. A small sandy patch is present in Sectin, 49-0 cm. rilling disturbance: Sectin 1 is slightly fractured and lcally brecciated (16-3 cm); Sectin 3, is slightly fractured thrughut. 1, 7 Glaucnite Mica Pyrxene I I

18 00 *>. t SITE 74 HOLE CORE R CORE INTERVAL mbsf 74A-- 1 LITHOLOGIC ESCRIPTION Majr lithlgy: iamictite (sand-silt clay with minr gravel), dark gray (Y 41), hmgeneus, massive, structureless. The diamictite is firm, cmpacted but friable. The gravel cmpnent varies frm 1-% thrughut the cre. The clasts are mainly <1 cm in diameter, with the largest recrded clast up t 3 cm in diameter; they are mstly subrunded t subangular and cm,psed predminantly f quartz, quartzite, granite and gneiss. The sand cntent and hence the grain size vary thrughut the cre. A fine-grained greenish-black layer with sharp upper bundary and gradatinal lwer bundary ccurs in Sectin 1, cm. rilling disturbance: Sectins 1, and 3 are slightly fractured. Sectins and 3 shw bwed clr banding due t disturbance during drilling Glaucnite Mica Pyrxene 0 17 _ 1 4

19 SITE 74 HOLE A CORE 3R CORE INTERVAL mbsf 74A-3R LITHOLOGIC ESCRIPTION Minr lithlgy: Calcareus diamictite, light gray (Y 61), hard, well lithified and cemented by carbnate; cntacts sharp r gradatinal. Sectin, 14-0 cm; Sectin 4, cm. 4,70 Organic matter Pyrxene

20 SITE 74 HOLE A CORE 4R CORE INTERVAL mbsf LITHOLOGIC ESCRIPTION Majr lithlgy: iamictite (sand-silt clay with minr gravel), dark gray (Y 41), hmgeneus, massive, structureless. The diamictite is firm, cmpact and friable, but with a variable sand cntent. The gravel cmpnent ranges frm 1-3% thrughut the cre; clast size is generally <1 cm with the largest being 4. cm in diameter. Mst clasts are metamrphic and cmprise 36% subangular, 9% subrunded, 7% runded and 7% angular types (sample size 44). rilling disturbance: Sectin, cm shws bwed clr banding due t disturbance during drilling., 0 3, 3 Glaucnite Mica Organic matter 74AR NO RECOVERY

21 SITE 74 HOLE A CORE 6R CORE INTERVAL mbsf 74A-6R LITHOLOGIC ESCRIPTION :üui Majr lithlgy: iamictite (sand-silt clay with minr gravel), dark gray (Y 41), hmgeneus, massive, structureless. The diamictite is firm, cmpact but friable; the sand cntent is variable. The gravel cmpnent varies frm 1-%; clasts are generally < 1 cm in diameter with a maximum diameter f cm. Mst clasts are subangular t subrunded and f metamrphic rigin, with a large prprtin (0-30%) f small (<1. cm diameter), black elngate amphiblite clasts. A greenish layer ccurs in Sectin 1, cm, and a light grayish green layer in the same sectin between cm. rilling disturbance: Sectin shws bwed clr banding due t disturbance during drilling , M Mica Micrite Organic Matter Pyrxene

22 SITE 74 HOLE A CORE 7R CORE INTERVAL mbsf 74A-7R LITHOLOGIC ESCRIPTION iüs Majr lithlgy: iamictite (sand-silt clay and clay-silt sand with minr gravel), dark gray (Y 41), hmgeneus, massive, structureless. The diamictite is firm, cmpact, but slightly friable. The gravel cmpnent varies frm 1-% thrughut the cre. The clasts are generally <1 cm in diameter with a maximum diameter f 3 cm. The clasts are cmpsed mainly f igneus and metamrphic rcks and cmprise 40% subrunded, 33% runded and 6% subangular types (sample size 1). Several clast cavities are lined with fine pyrite: sand cntent and grain size vary thrughut the cre. The grains are cmpsed mainly f quartz, gneiss, pyrxene, igneus and metamrphic material. Shells ccur in Sectin 3, 6 cm; Sectin,1 cm. Faint blthes f paler gray material ccur near the base f Sectin 4. Light gray patches cemented by carbnate are present in the cre catcher, 7-13 cm. rilling disturbance: Sectin 6, 0-0 cm, slightly fractured, 0-4 cm, mderately fractured., Glaucnite Organic matter ^

23 SITE 74 HOLE A CORE 8R CORE INTERVAL mbsf!8r 1 LITHOLOGIC ESCRIPTION Majr lithlgy: iamictite (sand-silt-clay with minr gravel), very dark gray (Y 31) and unnamed gray (.G 30), massive, hmgeneus, structureless, cmpacted but friable. Clasts are mstly <1 cm in diameter, the largest is cm in diameter. Clast rundness analysis indicates: 10% angular, 46% subangular, 36% subrunded, 8% runded (sample size 0). Clasts include quartz, feldspar, vein quartz, unfliated amphiblitic rcks, amphiblitic gneiss, quartz-feldspar-bitite gneiss, sme weathered gneiss. The grain rientatin n visual inspectin appears t be randm. Average gravel cntent: Sectin 1:1% Sectin -7: 1-3%, 90, 100 isfel Access, minerals Amphible Micrite

24 00 cβ SITE 74 HOLE A CORE 9R CORE INTERVAL mbsf 74A-9R LITHOLOGIC ESCRIPTION Majr lithlgy: iamictite (sand-silt-clay with minr gravel), very dark gray (Y 31), massive, hmgeneus, structureless, cmpacted but friable. Clasts are mstly granule size, the largest is cm in diameter. Clast rundness analyses in Sectins 1-6 indicate: 6% angular, 4% subangular, 40% subrunded, 1% runded (sample size 0). Clasts include quartz, feldspar, vein quartz, amphiblite, varius gneisses, but n bvius sedimentary rcks. mm Average gravel cntent Sectin 1 1-3% Sectin % Sectin 3 1% Sectin 4 % Sectin 1% Sectin 1% Sectin 6 1% -rj-sfi Access. Minerals Amphible Micrite 0 0

25 SITE 74 HOLE A CORE 3OR CORE INTERVAL mbsf 74A-30R LITHOLOGIC ESCRIPTION Majr lithlgy: iamictite (sandsilt-clay with minr gravel), very dark gray (Y 31), in Sectin, cm, black (Y.1), massive, hmgeneus, structureless, cmpacted but friable. A zne with an bvius (acid test) micrite cntent ccur in.sectin 6, cm. Clasts are mstly < mm in diameter, the largest is 4x cm. Clast rundness analyses in Sectins 1-4 indicate: 1% angular, 41% subangular, 39% subrunded, 8% runded (sample size 64). Clasts include quartz, feldspar, varius gneisses, amphiblite, vein quartz, sandstne, quartzite, granite, and traces f weathered sandstne. Average gravel cntent: Sectin 1: 1-3% Sectin : 1-3% Sectin 3: -3% Sectin 4: 3-% Sectin : % Sectin 6: % CC: % rilling disturbance: In Sectins 3-6 several intervals with slightly darker, black (Y.1) bands ccur. The bands mainly are - mm thick and tend t be cnvexup t varius degrees. They typically have a spacing f -4 cm. These bands are assumed t have generated during drilling. Access, mineral! Amphible Micrite

26 SITE 74 HOLE A CORE 31R CORE INTERVAL mbsf LITH0L0GY LITH0L0GIC ESCRIPTION Majr lithlgy: iamictite (sandsiltclay with minr gravel), very dark gray (Y 31) and dark gray (Y 41), massive, hmgeneus, structureless, cmpacted but friable. A zne with an bvius (acid test) micrite cntent ccur in Sectin, cm. Within this zne, there is a distinct interval ( cm) where the diamictite is carbnate-cemented, hard and black (Y.1). Clasts are mstly < mm in diameter, the largest is 1 cm dwncre. Clast rundness analyses in Sectins 1-4 indicate: 10% angular, 3% subangular, 46% subrunded, 1% runded (sample size 0). Clasts include quartz, feldspar, varius fresh and weathered gneisses, amphiblite, vein quartz, quartzite. The large clast in Sectin 3, cm, is and quartz-feldspar-amphiblegarnet-pyrxene gneiss. -*m Access, minerals Amphible Micrite

27 SITE 74 HOLE A CORE 3R CORE INTERVAL mbsf TIME-I BIOSTRΔT. ZONE FOSSIL FORAMIIMIFERS NΔNNOF OSSILS CHARACTER RΔIOL1RIANS IATOM: x 3 (N<N II II ^ ~ ^ C N <J >* N<N ^ ~ > * CHEMIS TRY TO ii <J <-> 1SECTIOr METERS 0. 1.O~~ - - LITH0L0GY WßiM ë RILLINiG ISH UJ RUCTUR S) SAMPLE * IAMICTITE LITHOLOGIC ESCRIPTION Majr lithlgy: iamictite (sand-silt-clay with minr gravel), very dark gray (Y 31) and dark gray (Y 41), massive, hmgeneus, structureless, cmpacted but friable. Clasts are mstly < mm in diameter, the largest is. X 4 cm. Clast rundness analyses in Sectins 1-3 indicate: 1% angular, 37% subangular, 37% subrunded, 11% runded (sample size 4). Clasts include quartz, feldspar, pyrite, varius gneisses, amphiblite, vein quartz, sandstne, carbnate-cemented sandstne and quartzite. Average gravel cntent: Sectin 1-4: arund % 3, Access, minerals Amphible Mica 3 Micrite 0 74A-3R 4 - -

28 SITE 74 HOLE Δ CORE 33R CORE INTERVAL mbsf 74A-33R 1 Majr lithlgy: iamictite (sand-siltclay with minr gravel), very dark gray (Y 31) and dark gray (Y 41), massive, hmgeneus, structureless, cmpacted but friable. Clasts are mstly < mm in diameter, the largest is 1 X 1. cm. Minr lithlgies: a. iamictite, black (Y.1), hard, carbnate-cemented with diffuse bundaries; Sectin 4, 9-11 cm. b. Siitstne and sandstne with gravel, gray (Y 61), rhythmically interlaminated n a mm-cm scale, Sectin 6, 9-9 cm. This variable lithlgy cnsists f (1) mm-laminated siitstne, () weakly stratified clayey siltsne and (3) finely bedded layers f silty claystne with a few large clasts, and carse sand and gravel. Sme layers are cuplets, each with a carse lwer part with lwer ersinal and laded cntact, and an upper fine part. Larger clasts are dispersed pebbles, and include an intraclast f silt and a drpstne structure in Sectin 6, 84 cm. All laminae are flat-lying. A shell fragment f clay-alteratin material ccurs at 0 cm. a ró^ç^ Isr 0^-; Average gravel cm:ent: Sectin 1, 3-% Sectin, 3-% Sectin 3, 1-3% Sectin 4, 3-% Sectin, 3% Sectin 6, 0-9 cm, 3% 9-49 cm, % (laminated) 6-9 cm 7% (laminated) 6, 18 6, 0 M 6, 0 M IrJß Mica Organic matter

29 SITE 74 HOLE A CORE 34R CORE INTERVAL mbsf 74A-34R 1 <r -1 z in ü < LITHOLOGIC ESCRIPTION SILTY CLAYSTONE and SAN-SILT-CLAYSTONE, IAMICTITE, CARBONACEOUS SILTSTONE and SANSTONE Majr lithlgies: a. y claystπe interbedded with sandsiltclaystne n a scale f 1-3 cm, and with clrs dark gray (.Y 41) and gray (10YR 1) respectively (Sectin 1, cm). Mst cntacts are ill-defined, thugh sme silty claystnes have a sharp base. Small (<1 mm) drpstnes f metamrphic lithlgy ccur (Sectin 1, and 4 cm); als rare, well-runded intraclasts f the sft silty claystne (e.g., Sectin 1, 1 cm). y cmpnents ccur as trains f apparently drpped-in detritus, and are cmpsed f quartz, feldspar and lithic materials. A vague laminatin is encuntered in bth lithlgical phases. b. iamictite (sand-silt-clay with minr gravel), medium gray (.YR 41, Y 1 t Y 41; Sectin 1, 1-130, cm; Sectins, 3, 4; Sectin 6, 0-17 cm, 8-1 cm; CC). Hmgeneus except fr defrmatin structures (r defrmed laminae) at Sectin, 46-6 cm, 74-9 cm. Gravel cntents: % Sectin, -3% Sectin 3, % Sectin 4, 3% Sectin. N imbricatin, sme clasts stand upright; clast sizes <1 mm, almst all subrunded t subangular, mst cmpsed f quartz-feldspar, metamrphic lithics r cal. c. Carbnaceus siltstnes with interbedded sandstnes, bth cntaining cnspicuus amunts f mica and lignite gravel and sand (Sectin, 9-10 cm; Sectin 6, 0-80 cm). The black (10YR 31), carbnaceus siltstnes frequently have sharp but irregular bases and frequently shw n internal laminatin r textural grading. They cntain 3-1% f paque t light brwn lignite and plant fragments (sand-silt). The sandstnes are very well-srted, ff-white (.Y 7, 10Y 71) and exhibit n textural grading r laminatin. Partly runded clasts f dark brwn (YR 31) lignite in Sectin 6 (3 cm, cm) were apparently emplaced as pebbles, nt wd. Small (<1 cm) pebbles f metamrphic lithlgy ccur in a darker sandstne (Sectin, cm). efrmatin structures in the carbnaceus siltstnes and sandstnes extend int the assciated diamictites. Small, tight (-7 cm) fld hinges are recgnized (Sectin, 130, 140 cm), tgether with mre pen warping (e.g., Sectin, cm; Sectin 6, -47 cm) and sandy plumes (Sectin 6, cm). The defrmatin was sft-sediment (nn-brittle); hwever micrfaults in sme sands lie bth vertically and hrizntally. rilling isturbance: isturbance is limited t breaks f the cre at sme weak layers, fr instance unlithified sands. 1,34 1,40,34,9,116,16 T Organic matter