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This paper reports the isotope effects in an open-system Fischer–Tropsch type (FTT) synthesis, with implications for the origin of natural abiogenic hydrocarbons. The starting form of carbon was CO 2 , with carbon and hydrogen isotopic compositions measured for products of catalytic hydrogenation of CO 2 on iron and cobalt catalysts (FTCO 2 -Fe and FTCO 2 -Co) at 350...