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Barrett, T J; Friedrichsen, Hans (1983): (Table 1) Sulfur isotopes, total sulfur, and degree of oxidation of basalt samples from DSDP Holes 69-504B and 70-504B. PANGAEA,, Supplement to: Barrett, TJ; Friedrichsen, H (1983): Oxygen- and hydrogen-isotope composition of some basalts from Deep Sea Drilling Project Hole 504B, Costa Rica Rift, Legs 69 and 70. In: Cann, JR; Langseth, MG; Honnorez, J; Von Herzen, RP; White, SM; et al. (eds.), Initial Reports of the Deep Sea Drilling Project (U.S. Govt. Printing Office), 69, 637-642,

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Whole-rock basalt samples from the upper half of Deep Sea Drilling Project Hole 504B have oxygen-isotope compositions typical of mid-ocean-ridge basalts which have experienced a moderate degree of low-temperature alteration by sea water. By contrast, d18O values in the lower half of the hole correspond to basalts which have experienced almost no detectable oxygen-isotope alteration. These observations suggest that the overall water/rock ratio was lower in the lower half of the drilled crust. A correlation between d18O values and 87Sr/86Sr ratios suggests that the water/rock ratio, rather than temperature variation, was the main factor determining basalt d18O values. Hydrogen-isotope data appear to be consistent with a low water/rock ratio in the lower part of the crust.
Median Latitude: 1.227100 * Median Longitude: -83.730100 * South-bound Latitude: 1.227000 * West-bound Longitude: -83.730200 * North-bound Latitude: 1.227200 * East-bound Longitude: -83.730000
Date/Time Start: 1979-10-07T00:00:00 * Date/Time End: 1979-12-04T00:00:00
Minimum Elevation: -3460.0 m * Maximum Elevation: -3460.0 m
69-504B * Latitude: 1.227200 * Longitude: -83.730200 * Date/Time: 1979-10-07T00:00:00 * Elevation: -3460.0 m * Penetration: 489 m * Recovery: 262 m * Campaign: Leg69 * Basis: Glomar Challenger * Device: Drilling/drill rig (DRILL)
70-504B * Latitude: 1.227000 * Longitude: -83.730000 * Date/Time: 1979-12-04T00:00:00 * Elevation: -3460.0 m * Penetration: 836.1 m * Recovery: 91.6 m * Campaign: Leg70 * Basis: Glomar Challenger * Device: Drilling/drill rig (DRILL) * Comment: 40 cores; 328.6 m cored; 18.5 m drilled; 27.9 % recovery
#NameShort NameUnitPrincipal InvestigatorMethodComment
1Event labelEvent
2Sample code/labelSample labelBarrett, T JODP sample designation
3Sample IDSample IDBarrett, T J
4PiecePieceBarrett, T J
5Lithology/composition/faciesLithologyBarrett, T J
6AlterationAlterationBarrett, T J#1
7AlterationAlterationBarrett, T J#2
8AlterationAlterationBarrett, T J#3
9δ18Oδ18OBarrett, T JMass spectrometrySMOW
10δ DeuteriumδD‰ SMOWBarrett, T JMass spectrometry
122 data points

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