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Table T12. Compilation of basement fluid chemistries, eastern Juan de Fuca Ridge and Site 504.

Sample
description		 Depth
(mbsf)		 Temperature
(°C)		 Salinity pH
(25°C)		 Alkalinity
(mM)		 Cl
(mM)		 SiO2
(µM)		 SO4
(mM)		 Ca
(mM)		 Na
(mM)		 K
(mM)		 Mg
(mM)		 Sr
(µM)		 Li
(µM)		 Comments
Eastern flank of the Juan de Fuca Ridge:
168–1023 basement fluid 192 16 34 7.8 2.89 542 600 24.2 11.5 465 10.1 47.2 90 24 All Juan de Fuca Ridge samples compiled from: Davis, Fisher, Firth et al., 1997; Elderfield et al., 1999; and Mottl et al., 2000
168–1024 basement fluid 167 23 34 7.8 1.83 540 508 24.3 16.7 463 9.6 42.5 92 28
168–1025 basement fluid 97 39 34.5 7.7 0.92 547 394 26.7 36.4 467 7.3 27.3 99 27
168–1030 basement fluid 42 40 35.5 7.9 0.46 559 221 26.7 57.1 473 5.2 5.7 109 23
168–1031 basement fluid 40 40 36 8.0 0.39 557 257 22.3 60.3 470 5.3 4.7 115 13
168–1028 basement fluid 131 51 34 8.1 0.38 549 131 23.4 40.4 462 4.3 16.0 138 70
168–1029 basement fluid 220 59 35 8.0 0.79 548 208 15.0 54.5 452 4.7 12.7 137 43
168–1032 basement fluid 285 57 35 8.2 0.27 555 155 17.7 61.4 458 3.0 2.8 156 28
168–1026 basement fluid 229 62 35 8.0 0.35 551 173 16.8 65.7 437 2.4 4.6 156 45
168–1026B WSTP basement fluid 256 62   7.3 0.63 551 ~700 16.7 56.1 461 6.6 2.2 110 10
168–1027 basement fluid 602 63 35 9.1 0.48 551 80 14.5 62.5 446 3.3 5.0 162 31
Site 504, Costa Rica Rift:
111–504 bottom seawater 0 2 34.8 7.6 2.50 554 165 28.6 10.5 475 10.4 53.4 90 26 Becker, Sakai, et al., 1988
69–504 uppermost basement fluid 274 57 34.7 6.9 0.63 546 750 21.4 32.6 461 6.0 27.7 437 23 Mottl et al., 1983
83–504B deepest borehole fluid 793 115 34.9 6.5 2.48 547 1881 17.6 40.1 439 7.2 28.8 86   Mottl et al., 1985
111–504B deepest borehole fluid 1236 146 32.0 6.6 1.34 541 1995 6.7 36.7 416 8.0 29.3   47 Becker, Sakai, et al., 1988
137–504B BS-8 (LANL) 1500 158 33.4 5.7 1.74 556 1802 6.1 43.0 409 8.4 26.9 66 53 Becker, Foss, et al., 1992

Note: WSTP = water-sampling temperature probe, LANL = Los Alamos National Laboratory.

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