Abstract:Based on about 300 lead and over 500 sulfur isotopic data from more than 30 deposits, this paper describes the distribution characteristics of lead and sulfur isotopes in stratabound ore deposits in China with an approach to such problems as metallogenic epochs, ore genesis, ore sources, ore-forming processes, ore prospecting and ore assessment. Lead isotopic compositions of the investigated deposits can be grouped into three types, ordinary type, anomalous type and mixed type. In all deposits except those of the second type, isotopic ratios of the ordinary lead or the least radiogenic lead decreases as the age of country rock increases. Calculated model age of the least radiogenic lead in most cases is consistent with or close to geological time of the country rock. ln a few deposits it represents the age of source material. In a small number of deposits, δ34S values, like those of troilite, vray within a very narrow range, mostly distributed near the zero line of the histogram, whereas in most stratabound deposits, δ34S values are scattered considerably and can also be classified into three types: light sulfur type-δ34S values fall on the left of the zero line; heavy sulfur type-δ34S values fall on the right of the zero line; and mixed type-δ34S values are highly variable, bearing the characteristics of a mixture of the first two types. In certain deposits, evident correlation exists between the variation of lead isotopes and that of sulfur isotopes. This usually finds expression in the augmentation of lead isotope ratios with the increase ofδ34S values. These two isotopic compositions in most deposits seem to be distributed with regularity. The above mentioned isotopic characteristics are of great significance in identifying slightly transformed sedimentary deposits, strongly transformed sedimentary deposits and epigenetic deposits among the stratabound ore deposits in China.
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陈好寿.1983.我国层控多金属矿床的铅、硫同位素研究[J].矿床地质,2(3):79~87.1983.Lead and sulfur isotope studies of the stratabound polymetallic deposits in China EAD AND[J].Mineral Deposits2(3):79~87
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