Table 2. Modeled sulfate reduction rates.

	Site 998	Site 999	Site 1000	Site 1001
Depth to asymptotic SO42- concentration (mbsf):	Not achieved; "linear" decreaseto deepest sample (515.5 mbsf)	192.6	384.6	Not achieved; "linear" decrease to deepest sample (365.4 mbsf)
dC (in mM relative to 28.9 mM of overlying seawater):	(28.9-21.0)	(28.9-12.5)	(28.9-17.0)*	(28.9-23.5)**
			(17.0-1.29)†	(23.5-18.9)‡
Øo:	0.78	0.79	0.70*	0.67**
			0.60†	0.60‡
Øb:	0.51	0.60	0.60*	0.63**
			0.58†	0.40‡
Ø:	0.60	0.65	0.65*	0.63**
			0.59†	0.44‡
(m/m.y.):	16.1	27.5	33.4*	13.8**
			33.4†	16.7‡
Ds (cm2 s-1):	2.0 × 10-6	2.0 × 10-6	2.0 × 10-6	2.0 × 10-6
Depth-integrated sulfate reduction rate	2.5 × 10-5	7.7 × 10-5	13.1 × 10-5*	1.9 × 10-5**
(mmol cm-2 yr-1):			4.9 × 10-5†	1.7 × 10-5‡
Total:			18.0 × 10-5	3.6 × 10-5
Mean total organic carbon (wt%):	0.007	0.13	0.15	0.03**
				0.02‡
Mean total sulfur (wt%):	0.06	0.08	0.10	0.16**
				0.05‡

Notes: For nonasymptotic sites (Sites 998 and 1001), depth-integrated rates reflect sulfate reduction only within the interval analyzed and are therefore minimum estimates. The asymptotic sulfate trend at Site 999 was treated as a single linear decrease. The asymptotic decrease at Site 1000 was divided into two distinct linear trends; each was treated separately in the calculations: * = depths of 0-50 mbsf, † = depths of 50-384.6 mbsf. Site 1001 is characterized by a major unconformity at ~165 mbsf. Intervals above and below were treated separately: ** = depths of 0-165 mbsf, ‡ = depths of 165-365.4 mbsf. Complete data are available in Sigurdsson, Leckie, Acton, et al. (1997). See text for equation and full explanation of parameters.