Table T21. Compressional wave velocity data, Site 1188.

Table T21. Compressional wave velocity data, Site 1188.

Core, section, interval (cm)

Piece

Depth
(mbsf)

Velocity (km/s)

Sil/Qtz

Anh

Cl

Py

Plag

Mt

Vesicles

Alteration

Comments

193-1188A-

7R-2, 77.5 6 50.48 3.5 30 15 45 10 0 0 0 Vh Clastic rock with 2-cm clasts with flow-banded texture.

10R-2, 61.5 10 79.40 4.7 35 7 23 3 31 0 Tr Hi Aphyric sparsely vesicular. Small vein completely filled with quartz-pyrite.

12R-2, 44 4 98.70 3.6 65 Tr 30 2 0 0 0 Cm Spectacular folded flow banding: chlorite bands with isolated spherulites + light gray clay-rich bands; band thickness = 1-5 mm.

16R-1, 63 9 136.03 4.6 80 1 10 7 2 0 3 Vh Dark gray, light gray; round vesicles 1-2 mm. Traces of a chlorite.

16R-2, 46 7 137.32 3.9 42 0 15 5 37 0 Tr Hi Fine volcanic rock with obvious lamination.

17R-2, 30 6 146.90 4.4 55 20 20 Tr 0 5 0 Cm Jigsaw breccia, possibly after perlitic texture.

19R-1, 86 16 165.16 3.8 35 1 10 Tr 35 3 5 Hi Flattened ovoid vesicles, only partly filled by anhydrite. Vesicles mostly <1 mm, varying up to 1 cm (long dimension).

193-1188F-

13Z-1, 35 2 241.75 4.5 40 1 56 2 1 0 0 Cm Autoclastic breccia with quartz-filled vesicles.

14Z-1, 61 3 246.51 5.8 45 Tr 42 1 12 Tr 0 Vh Silicified volcanic rock with quartz-filled, flattened vesicles.

19Z-1, 14 1B 261.54 4.8 26 2 67 5 0 Tr 0 Cm Silicified volcanic rock with quartz-filled, flattened vesicles.

26Z-1, 21 2 300.31 3.8 65 2 28 Tr 5 Tr 3 Cm Silicified porphyritic volcanic rock with relict plagioclase phenocrysts.

34Z-1, 46 9A 336.86 5.3 57 0 40 1 0 2 2 Cm Aphyric volcanic rock with magnetite.

37Z-2, 19 2 346.01 6.3 45 Tr 30 5 20 Tr 0 Hi Aphyric, sparsely vesicular volcanic rock.

38Z-2, 89 4 351.18 6.2 30 2 35 1 32 Tr 1 Hi Sparsely plagioclase-phyric volcanic rock.

39Z-1, 42 6 353.92 4.0 60 1 39 Tr 0 Tr 3 Cm Sparsely plagioclase-phyric volcanic rock.

Core, section, interval (cm)	Piece	Depth (mbsf)	Velocity (km/s)	Sil/Qtz	Anh	Cl	Py	Plag	Mt	Vesicles	Alteration	Comments
193-1188A-
7R-2, 77.5	6	50.48	3.5	30	15	45	10	0	0	0	Vh	Clastic rock with 2-cm clasts with flow-banded texture.
10R-2, 61.5	10	79.40	4.7	35	7	23	3	31	0	Tr	Hi	Aphyric sparsely vesicular. Small vein completely filled with quartz-pyrite.
12R-2, 44	4	98.70	3.6	65	Tr	30	2	0	0	0	Cm	Spectacular folded flow banding: chlorite bands with isolated spherulites + light gray clay-rich bands; band thickness = 1-5 mm.
16R-1, 63	9	136.03	4.6	80	1	10	7	2	0	3	Vh	Dark gray, light gray; round vesicles 1-2 mm. Traces of a chlorite.
16R-2, 46	7	137.32	3.9	42	0	15	5	37	0	Tr	Hi	Fine volcanic rock with obvious lamination.
17R-2, 30	6	146.90	4.4	55	20	20	Tr	0	5	0	Cm	Jigsaw breccia, possibly after perlitic texture.
19R-1, 86	16	165.16	3.8	35	1	10	Tr	35	3	5	Hi	Flattened ovoid vesicles, only partly filled by anhydrite. Vesicles mostly <1 mm, varying up to 1 cm (long dimension).

193-1188F-
13Z-1, 35	2	241.75	4.5	40	1	56	2	1	0	0	Cm	Autoclastic breccia with quartz-filled vesicles.
14Z-1, 61	3	246.51	5.8	45	Tr	42	1	12	Tr	0	Vh	Silicified volcanic rock with quartz-filled, flattened vesicles.
19Z-1, 14	1B	261.54	4.8	26	2	67	5	0	Tr	0	Cm	Silicified volcanic rock with quartz-filled, flattened vesicles.
26Z-1, 21	2	300.31	3.8	65	2	28	Tr	5	Tr	3	Cm	Silicified porphyritic volcanic rock with relict plagioclase phenocrysts.
34Z-1, 46	9A	336.86	5.3	57	0	40	1	0	2	2	Cm	Aphyric volcanic rock with magnetite.
37Z-2, 19	2	346.01	6.3	45	Tr	30	5	20	Tr	0	Hi	Aphyric, sparsely vesicular volcanic rock.
38Z-2, 89	4	351.18	6.2	30	2	35	1	32	Tr	1	Hi	Sparsely plagioclase-phyric volcanic rock.
39Z-1, 42	6	353.92	4.0	60	1	39	Tr	0	Tr	3	Cm	Sparsely plagioclase-phyric volcanic rock.

Notes: Sil/Qtz = silica/quartz, Anh = anhydrite, Cl = clay, Py = pyrite, Plag = plagioclase, Mt = magnetite. Tr = trace. Cm = complete, Vh = very high, Hi = high.