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Sediments of the Barbados Ridge complex, cored on DSDP Leg 78A, contain low concentrations of acid-insoluble carbon (0.05-0.25%) and nitrogen (C/N 1.5-5) and dispersed Cj-C6 hydrocarbons (100-800 ppb). The concentrations of organic carbon and C in organic carbon decrease with depth, whereas the concentration of dispersed hydrocarbons increases slightly with depth. These trends may reflect the slow oxidation of organic matter, with selective removal of C and slow conversion of the residual organic matter to hydrocarbons. Very minor indications of nitrogen gas were observed at about 250 meters sub-bottom at two of the drilling sites. Basement basalts have calcite veins with δC values in the range of 2.0 to 3.2‰ and δ 1 8 O S M O W values ranging from 28.5 to + 30.6‰. Interstitial waters have δ 1 8 O S M O W of 0.2 to 3.5‰ and δD S M cW of 2 to 15‰. The oxygen isotopic composition of the calcite veins in the basement basalts gives estimated equilibrium fractionation temperatures in the range of 11 to 24°C, assuming precipitation from water with δ 1 8 O S M O W in the range of +0.1 to l.O‰. This suggests that basalt alteration and precipitation of vein calcite occurred in contact either with warmer Campanian seawater or, later, with pore water, after burial to depths of 200300 meters. Pore waters from all three sites are depleted in deuterium and O, and dissolved sulfate is enriched in S at Sites 541 and 542, but not at Site 543.

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Diagenesis of Organic Matter, Isotopic Composition of Calcite Veins in Basement Basalt and Pore Water in SedimentBarbados Ridge Complex, Deep Sea Drilling Project Leg 78A

Diagenesis of Organic Matter, Isotopic Composition of Calcite Veins in Basement Basalt and Pore Water in SedimentBarbados Ridge Complex, Deep Sea Drilling Project Leg 78A

Diagenesis of Organic Matter, Isotopic Composition of Calcite Veins in Basement Basalt and Pore Water in SedimentBarbados Ridge Complex, Deep Sea Drilling Project Leg 78A