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Low concentrations of acid insoluble carbon (0.05-0.25%), nitrogen (C/N 1.5-5) and dispersed hydrocarbons (100-800) occur. Basement basalts have calcite veins with delta 13C values in the range of 0.2 to -3.5% and delta 18OSMOW of 28.5-30.6per mille. The O isotopic compensation of the calcite gives equilibrium fractionation T of 11o-24oC.-K.A.R.
Additional Publication Details
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.