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Twenty-three samples of Site 374 (Ionian Sea) Miocene to Quaternary carbonates were analyzed to determine their stable oxygen and carbon isotopes and mineralogical contents. In addition, the isotopic ratios of organic carbon were determined in eight samples of sapropel. Different depositional environments provided different mechanisms of carbonate formation and deposition as suggested by characteristic isotopic and mineralogical compositions. The extremely low δC 1 3 values of organic carbon in sapropels may be attributed to fractionation processes which are not completely understood at present.

Stable Isotopes of Oxygen and Carbon in Carbonates and Organic Material from Pleistocene to Upper Miocene Sediments at Site 374 (DSDP Leg 42A)