广西东平锰矿床地质地球化学特征及矿床成因
Geology, Geochemistry and Genesis of the Dongping Manganese Deposit, Guangxi Province, China
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三叠纪是中国南方一个最重要的成锰时代,在华南板块和周围赋存许多大中型的锰矿床. 东平锰矿位于中国广西桂西南成矿带. 以东平锰矿为研究对象,通过显微薄片观察、电子探针分析及全岩地球化学分析等方法,探讨了锰矿的物质来源和矿床成因. 通过矿相学的研究工作,我们发现东平锰矿里广泛赋存有黄铁矿、黄铜矿、闪锌矿、方铅矿、辉砷钴矿、硫镍钴矿等一些硫或砷化物. 锰矿石样品中Al/(Al+Fe+Mn)、Y/Ho比值和Fe-Mn-(Ni+Cu+Co)×10、lgU-lgTh投图等表明锰矿的成矿物质来源与热水活动有关;正Ce异常及V/(V+Ni)等指示锰最初是在氧化环境中富集. 综合以上研究,我们认为东平锰矿的锰质来源主要与热液活动有关;热液来源的锰最初以氧化物或者氢氧化物的方式沉淀,在成岩过程中转变为锰碳酸盐.
Dongping manganese deposit / geochemistry / source of ore-forming material / metallogenesis model
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国家自然科学基金项目(41972091)
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