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各种天然介质中形成的碳酸盐矿物具有一定的氧和碳同位素组成。影响其同位素变化的原因有:形成该矿物的流体的同位素组成,矿物的形成温度,有机作用,以及变质作用过程中、迁移和沉淀过程中脱碳酸气作用。后两种作用中氧和碳同位素组成应该“变轻”;若为热水溶液中沉淀的碳酸盐矿物,因铁的迁移形式的差别,如重碳酸盐或卤化物络合物的不同将会影响同位素组成,即碳和氧的来源不同,将出现复杂的情况,这有待于进一步研究。 近年来,应用氧同位素组成测定地质温度和推断流体的性质、物质来源等日益广泛。但
Carbonates formed in various natural media have certain oxygen and carbon isotopic compositions. The reasons that influence the change of isotope are the isotopic compositions of the fluids forming the mineral, the temperature of mineral formation, the organic effect, and the decarbonation during the process of metamorphism and migration. Oxygen and carbon isotope composition should be “light” in the latter two effects; if carbonate minerals are precipitated in hot aqueous solution, due to differences in the migration patterns of iron, such as bicarbonate or halide complex, Will affect the isotopic composition, that is, different sources of carbon and oxygen, there will be complex situations, which needs further study. In recent years, the application of oxygen isotope composition determination of geological temperature and inferred fluid properties, sources of material is increasingly widespread. but