Table 1.

Table 1. Summary of Leg 164 gas hydrate proxy measurements in sediment cores.

Hole Core Section Interval
(cm) Depth
(mbsf) Gas hydrate indicator

994C
4H
5-7*
90; 70*
29.8-32.9
S (core photo)

994C
22X
5
70-80
180.1
S (core photo)

994C
31X
7
10-50
260.1
Recovered hydrate 10-cm thick

994C
32X
1
0-25
261.1
S

994C
36P
1
0-23
300.0
S (core photo)

994D
8X
2
65-105
398.3
TA

994C
53P
1
0-5
434.1
S (core photo)

994C
63X
6
130-150
591.0
TA

995A
27P
1
0-100
225.5
PCS gas, S, Cl^-

995A
29X
1
60-70
233.7
TA

995A
29X
1
135-140
234.5
TA

995A
29X
2
13-17
234.7
TA

995A
30X
1
60-110
243.3
TA

995A
32X
1
133-150
263.3
TA (frozen sediment, S)

995A
36P
1
15-40
300.6
S (core photo), Cl^-

995B
10P
1
0-68
319.9
S (core photo), Cl^-

995A
45P
1
0-60
376.5
PCS gas

995B
11X
4
15
414.5
Small wafer of gas hydrate

995A
54X
CC
0-20
444.9
TA

997A
25P
1
0-78
202.9
S

997A
28X
CC
0-26
231.3
TA

997A
29X
2
0-10
234.3
TA

997A
32X
4
255-256.5
256.0
TA

997A
42X
3
330-331.1
330.6
Massive hydrate, S, TA, Cl^-

997A
49P
1
0-50
395.4
S

997A
51P
1
0-20
404.9
S

997B
6P
1
0-26
433.6
S (core photo)

997A
55P
1
0-40
433.8
S

997B
11X
1-5

463-472
TA (below BSR) attributed to gas expansion

997B
12X
1-4

472-482
TA (below BSR) attributed to gas expansion

997B
13X
1-4

482-491
TA (below BSR) attributed to gas expansion

997B
15P
1
0-10
501.0
S (core photo)

997B
16X
1-7

501-510
TA (below BSR) attributed to gas expansion

Hole	Core	Section	Interval (cm)	Depth (mbsf)	Gas hydrate indicator
994C	4H	5-7*	90; 70*	29.8-32.9	S (core photo)
994C	22X	5	70-80	180.1	S (core photo)
994C	31X	7	10-50	260.1	Recovered hydrate 10-cm thick
994C	32X	1	0-25	261.1	S
994C	36P	1	0-23	300.0	S (core photo)
994D	8X	2	65-105	398.3	TA
994C	53P	1	0-5	434.1	S (core photo)
994C	63X	6	130-150	591.0	TA
995A	27P	1	0-100	225.5	PCS gas, S, Cl^-
995A	29X	1	60-70	233.7	TA
995A	29X	1	135-140	234.5	TA
995A	29X	2	13-17	234.7	TA
995A	30X	1	60-110	243.3	TA
995A	32X	1	133-150	263.3	TA (frozen sediment, S)
995A	36P	1	15-40	300.6	S (core photo), Cl^-
995B	10P	1	0-68	319.9	S (core photo), Cl^-
995A	45P	1	0-60	376.5	PCS gas
995B	11X	4	15	414.5	Small wafer of gas hydrate
995A	54X	CC	0-20	444.9	TA
997A	25P	1	0-78	202.9	S
997A	28X	CC	0-26	231.3	TA
997A	29X	2	0-10	234.3	TA
997A	32X	4	255-256.5	256.0	TA
997A	42X	3	330-331.1	330.6	Massive hydrate, S, TA, Cl^-
997A	49P	1	0-50	395.4	S
997A	51P	1	0-20	404.9	S
997B	6P	1	0-26	433.6	S (core photo)
997A	55P	1	0-40	433.8	S
997B	11X	1-5		463-472	TA (below BSR) attributed to gas expansion
997B	12X	1-4		472-482	TA (below BSR) attributed to gas expansion
997B	13X	1-4		482-491	TA (below BSR) attributed to gas expansion
997B	15P	1	0-10	501.0	S (core photo)
997B	16X	1-7		501-510	TA (below BSR) attributed to gas expansion

Notes: Interval depths given at the interval start unless otherwise noted. * = for Core 4H, measurements were taken from Section 5, 90 cm, through Section 7, 70 cm. S = soupy sediments noted in notebooks or, where indicated, in core photos; TA = core temperature anomaly (much colder than surrounding sediment or frozen, as noted); PCS gas = pressure coring system methane saturation within gas hydrate-stability field; Cl^- = chlorinity anomaly; BSR = bottom-simulating reflection.