Table T1. Pore water chemical and sulfate oxygen isotope data, Site 1231.

Depth (mbsf)	SO4 (mM)	H2S (mM)	Alkalinity (mM)	NH4 (µM)	18O-SO4 ( V-SMOW)
1.4	28.7		3.0	7.6
2.9	28.5		3.2	17.0
4.8	29.0		3.1
6.3			3.1	30.5
7.8	28.2		3.1	34.8
9.3			3.1	32.7
10.8	29.0	<0.2	3.2		10.5
12.3
14.3	29.2		3.4	34.2
17.3	29.2	<0.2	3.4		10.3
20.3	28.9		3.4	35.9
23.8	28.6		3.4	32.6
26.8	28.1	<0.2	3.6	29.8	10.2
29.8			3.4	33.4
33.3	28.5		3.5	30.9
36.3	28.5	<0.2	3.5	30.5	10.5
39.3	28.3		2.3	31.3
42.8	28.6		3.5	29.4
48.8	28.4		3.6	28.4
52.3	27.8			30.2
55.3	27.0	<0.2	4.0	27.8	10.2
58.3	27.9		3.6	23.8
61.8	27.6		3.6	22.7
64.8	27.5	<0.2	3.5	19.5
67.8			3.6	21.8	10.2
71.3	27.4		3.5
74.3	26.9	<0.2	3.7	9.0	10.0
77.3	26.9		3.6	10.0
80.8	26.9		3.4	11.5
83.8	27.2	<0.2	3.4	13.2	10.0
86.8	26.9		3.4	9.4
90.3	27.6		3.4	10.5
93.3	27.6	<0.2	3.4		9.9
96.3	27.5		3.4	5.3
99.8	27.5		3.2	2.0
102.8	27.1	<0.2	3.8	1.4	9.7
105.8	27.3		3.2	0.1
107.3	27.0		3.1	4.1
110.8	25.9			0.1
112.3	26.6	<0.2	3.0	1.6	9.7
113.8	26.8		3.1	1.2

Note: V-SMOW = Vienna-standard mean ocean water.