【摘要】 <正> 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。但更多还原

【Abstract】 Oxygen and carbon isotopes of 117 samples collected from 7 districts of siderite ore deposit are studied. They all occur in the carbonate rocks of marine stratigraphy. The data obtained seems to provide comparative base to distinguish the oxygen and carbon isotope characteristics of different genesis of siderite. However, these are only preliminary results and we consider that these comparisons must be treated with care. Informations of defferent genesis of siderite ore diposits can be gathered on the base connected closely with their geological Occurrences. The results of our investigation shows that it may be profitable and necessary to study the correlation of composition of oxygen and carbon isotopes between siderite ore deposit and its wall rocks.更多还原