Table T2. Petrographic features of sediments from rift basin Sites 1108, 1110, 1111, and 1112. (See table notes. Continued on next page.)

Table T2. Petrographic features of sediments from rift basin Sites 1108, 1110, 1111, and 1112.

Age

Core, section, interval (cm)

Depth (mbsf)

Lithology

Matrix/Cement

Lithic fragments

Bioclasts

Organic carbon

180-1108B-

Pleistocene 1R-2, 57-63 1.57 Clay-bearing nannofossil ooze

3R-CC, 0-4 14.50 Medium- to coarse-grained sandstone Carbonatic cement Shards, andesites, felsites, serpentinites, granites, serpentine schists, talc schists, chlorite schists Foraminifers, bryozoans

3R-CC, 16-20 14.66 Sandy siltstone Cement Shards, andesites, serpentinites, serpentine schists, talc schists

5R-CC, 6-8 33.86 Fine-grained sandstone Carbonatic cement Shards, andesites, serpentinites, talc schists

10R-1, 84-86 82.74 Mixed lithic sand

14R-2, 2-4 121.38 Fine-grained sandstone Argillaceous matrix Volcanics Foraminifers

15R-1, 11-14 129.91 Fine-grained sandstone Carbonatic cement Shards, andesites, talc schists Bryozoans and benthic foraminifers

16R-CC, 1-2 142.05 Packstone

Planktonic foraminifers

16R-CC, 4-6 142.08 Calcareous sandstone

middle Pliocene 19R-3, 6-9 169.86 Foraminifer-rich clayey siltstone

20R-CC, 0-3 180.55 Medium-grained sandstone Matrix Shards, andesites, felsites, serpentinites, amphibole schists Bryozoans and benthic foraminifers

21R-CC, 1-3 189.08 Silty claystone
Andesites Planktonic and benthic foraminifers

22R-4, 61-64 202.31 Normal graded fine-grained sandstone Argillaceous/glassy matrix Shards, andesites Planktonic and benthic foraminifers, ostracodes

22R-6, 21-22 204.87 Fine-grained sandstone Carbonatic cement Andesites

23R-3, 34-36 210.15 Medium-grained sandstone Argillaceous matrix Andesites Benthic foraminifers

25R-1, 78.5-81.5 226.79 Interbedded fine-grained sandstone and siltstone Cement/matrix Shards, chlorite schists Benthic and planktonic foraminifers, bryozoans

26R-3, 17-21 238.77 Fine-grained sandstone
Serpentinites

26R-3, 39-41 238.99 Fine-grained sandstone
Serpentinites

27R-1, 29-33 245.19 Medium-grained sandstone
Andesites, basalts, dolerites, serpentinites (oxidized), granites, talc schists, amphibolites

27R-5, 60-62 251.51 Coarse-grained sandstone Matrix Andesites, felsites, basalts, volcanics, granites, gneissic rocks, epidosites, foliated metabasites

27R-5, 66-70 251.56 Sandstone

28R-3, 28-31 257.46 Fine-grained sandstone Glassy matrix Shards, volcanics Shell debris, ostracodes

28R-4, 68-70 258.77 Sandstone

29R-1, 54-58 264.64 Sandstone

30R-3, 44-46 276.39 Medium-grained sandstone
Andesites, talc schists Shell debris

31R-2, 20.5-23.5 284.68 Fine- to medium-grained sandstone Cement/argillaceous matrix Shards, talc schists, silty claystones Benthic foraminifers, red algae, shell debris

32R-3, 61-64 295.67 Medium-grained sandstone Cement/argillaceous matrix Andesites

33R-1, 41-44.5 302.71 Medium-grained sandstone
Andesites, serpentinites, amphibole schists, quartz schists, chlorite schists, talc schists

34R-2, 126-128 314.60 Coarse-grained sandstone
Shards, andesites, felsites

36R-1, 82-86 332.12 Fine- to medium-grained sandstone with granules and pebbles
Andesites, basalts, talc schists, limestones

36R-3, 0-4 333.42 Medium-grained sandstone
Andesites, serpentinites, talc schists

36R-3, 52-56 333.94 Medium-grained sandstone
Andesites, serpentinites, talc schists Shell debris

37R-1, 13-16 341.03 Medium-grained sandstone
Andesites, basalts

37R-4, 8-11 344.87 Fine- to coarse-grained sandstone
Andesites, basalts

39R-1, 94-96 361.02 Fine-grained sandstone
Quartz-arenites Planktonic foraminifers

41R-1, 64-68 380.04 Medium-grained sandstone
Andesites

41R-1, 75-78 380.15 Fine-grained sandstone Glassy matrix Shards, andesites Foraminifers

44R-1, 128-131 409.48 Calcareous sandy siltstone Carbonatic/argillaceous matrix

45R-CC, 8-10 419.64 Fine-grained sandstone Argillaceous matrix
Benthic foraminifers, shell debris

47R-1, 33-37.5 437.43 Fine-grained sandstone
Andesites, basalts, dolerites, gabbros, granites Shell debris

47R-CC, 5-7 437.82 Conglomerate Argillaceous matrix Altered shards, andesites, dolerites, metabasites

47R-CC, 25-29 438.01 Medium-grained sandstone Carbonatic cement, argillaceous matrix Altered shards, volcanics

48R-2, 86-89 448.16 Fine-grained sandstone Cement, argillaceous matrix Volcanics
X, as ribbons

49R-CC, 5-6 456.87 Medium-grained sandstone
Shards, volcanics

180-1110A-

Quaternary 1H-3, 52-54 3.52 Calcareous silty claystone

180-1111A-

Pleistocene 8R-2, 77-81 68.47 Silty clay

13R-2, 89-93 118.05 Calcareous clayey silt

180-1112A-

Pleistocene 1R-2, 20-23 1.70 Calcareous silty clay

X

3R-1, 2-5 20.52 Silty sandstone Matrix Shards
X, as ribbons

6R-1, 10-12 49.40 Fine-grained sandstone

9R-CC, 25-27 78.15 Medium-grained sandstone Matrix Andesites, felsites, basalts, volcanics, granites, gneissic rocks, epidosites, foliated metabasites

Age	Core, section, interval (cm)	Depth (mbsf)	Lithology	Matrix/Cement	Lithic fragments	Bioclasts	Organic carbon
	180-1108B-
Pleistocene	1R-2, 57-63	1.57	Clay-bearing nannofossil ooze
	3R-CC, 0-4	14.50	Medium- to coarse-grained sandstone	Carbonatic cement	Shards, andesites, felsites, serpentinites, granites, serpentine schists, talc schists, chlorite schists	Foraminifers, bryozoans
	3R-CC, 16-20	14.66	Sandy siltstone	Cement	Shards, andesites, serpentinites, serpentine schists, talc schists
	5R-CC, 6-8	33.86	Fine-grained sandstone	Carbonatic cement	Shards, andesites, serpentinites, talc schists
	10R-1, 84-86	82.74	Mixed lithic sand
	14R-2, 2-4	121.38	Fine-grained sandstone	Argillaceous matrix	Volcanics	Foraminifers
	15R-1, 11-14	129.91	Fine-grained sandstone	Carbonatic cement	Shards, andesites, talc schists	Bryozoans and benthic foraminifers
	16R-CC, 1-2	142.05	Packstone			Planktonic foraminifers
	16R-CC, 4-6	142.08	Calcareous sandstone
middle Pliocene	19R-3, 6-9	169.86	Foraminifer-rich clayey siltstone
20R-CC, 0-3	180.55	Medium-grained sandstone	Matrix	Shards, andesites, felsites, serpentinites, amphibole schists	Bryozoans and benthic foraminifers
	21R-CC, 1-3	189.08	Silty claystone		Andesites	Planktonic and benthic foraminifers
	22R-4, 61-64	202.31	Normal graded fine-grained sandstone	Argillaceous/glassy matrix	Shards, andesites	Planktonic and benthic foraminifers, ostracodes
	22R-6, 21-22	204.87	Fine-grained sandstone	Carbonatic cement	Andesites
	23R-3, 34-36	210.15	Medium-grained sandstone	Argillaceous matrix	Andesites	Benthic foraminifers
	25R-1, 78.5-81.5	226.79	Interbedded fine-grained sandstone and siltstone	Cement/matrix	Shards, chlorite schists	Benthic and planktonic foraminifers, bryozoans
	26R-3, 17-21	238.77	Fine-grained sandstone		Serpentinites
	26R-3, 39-41	238.99	Fine-grained sandstone		Serpentinites
	27R-1, 29-33	245.19	Medium-grained sandstone		Andesites, basalts, dolerites, serpentinites (oxidized), granites, talc schists, amphibolites
	27R-5, 60-62	251.51	Coarse-grained sandstone	Matrix	Andesites, felsites, basalts, volcanics, granites, gneissic rocks, epidosites, foliated metabasites
	27R-5, 66-70	251.56	Sandstone
	28R-3, 28-31	257.46	Fine-grained sandstone	Glassy matrix	Shards, volcanics	Shell debris, ostracodes
	28R-4, 68-70	258.77	Sandstone
	29R-1, 54-58	264.64	Sandstone
	30R-3, 44-46	276.39	Medium-grained sandstone		Andesites, talc schists	Shell debris
	31R-2, 20.5-23.5	284.68	Fine- to medium-grained sandstone	Cement/argillaceous matrix	Shards, talc schists, silty claystones	Benthic foraminifers, red algae, shell debris
	32R-3, 61-64	295.67	Medium-grained sandstone	Cement/argillaceous matrix	Andesites
	33R-1, 41-44.5	302.71	Medium-grained sandstone		Andesites, serpentinites, amphibole schists, quartz schists, chlorite schists, talc schists
	34R-2, 126-128	314.60	Coarse-grained sandstone		Shards, andesites, felsites
	36R-1, 82-86	332.12	Fine- to medium-grained sandstone with granules and pebbles		Andesites, basalts, talc schists, limestones
	36R-3, 0-4	333.42	Medium-grained sandstone		Andesites, serpentinites, talc schists
	36R-3, 52-56	333.94	Medium-grained sandstone		Andesites, serpentinites, talc schists	Shell debris
	37R-1, 13-16	341.03	Medium-grained sandstone		Andesites, basalts
	37R-4, 8-11	344.87	Fine- to coarse-grained sandstone		Andesites, basalts
	39R-1, 94-96	361.02	Fine-grained sandstone		Quartz-arenites	Planktonic foraminifers
	41R-1, 64-68	380.04	Medium-grained sandstone		Andesites
	41R-1, 75-78	380.15	Fine-grained sandstone	Glassy matrix	Shards, andesites	Foraminifers
	44R-1, 128-131	409.48	Calcareous sandy siltstone	Carbonatic/argillaceous matrix
	45R-CC, 8-10	419.64	Fine-grained sandstone	Argillaceous matrix		Benthic foraminifers, shell debris
	47R-1, 33-37.5	437.43	Fine-grained sandstone		Andesites, basalts, dolerites, gabbros, granites	Shell debris
	47R-CC, 5-7	437.82	Conglomerate	Argillaceous matrix	Altered shards, andesites, dolerites, metabasites
	47R-CC, 25-29	438.01	Medium-grained sandstone	Carbonatic cement, argillaceous matrix	Altered shards, volcanics
	48R-2, 86-89	448.16	Fine-grained sandstone	Cement, argillaceous matrix	Volcanics		X, as ribbons
	49R-CC, 5-6	456.87	Medium-grained sandstone		Shards, volcanics

	180-1110A-
Quaternary	1H-3, 52-54	3.52	Calcareous silty claystone

	180-1111A-
Pleistocene	8R-2, 77-81	68.47	Silty clay
	13R-2, 89-93	118.05	Calcareous clayey silt

	180-1112A-
Pleistocene	1R-2, 20-23	1.70	Calcareous silty clay				X
	3R-1, 2-5	20.52	Silty sandstone	Matrix	Shards		X, as ribbons
	6R-1, 10-12	49.40	Fine-grained sandstone
	9R-CC, 25-27	78.15	Medium-grained sandstone	Matrix	Andesites, felsites, basalts, volcanics, granites, gneissic rocks, epidosites, foliated metabasites

Notes: Lithic fragments: gabbro includes olivine gabbro, oxide gabbro, and diorite compositions; basalt and dolerite refer to tholeiitic serial affinity; andesite includes calc-alkaline basalt andesite and andesite to quartz andesite; felsite refers to dacite and rhyolite compositions; trachyte includes lava clasts and glass with K-feldspar microliths; granophyre indicates fine-grained eutectic quartz-feldspar intergrowth; shards include ash fall tephra or prevalent glassy matrix in turbidites; volcanics include fragments of uncertain definition. Prh = prehnite, Pmp = pumpellyite, X = present.