鄂西泥盆纪沉积铁矿成矿岩相古地理条件分析
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摘要
鄂西泥盆系33个沉积相柱状剖面的地层层序、岩石组合、沉积构造、生物化石、自生矿物和微量元素研究结果表明:该区泥盆纪沉积铁矿形成于海洋远滨环境,铁矿主要沉积在远滨坡地,赋存于灰岩夹页岩砂岩微相。矿石的品位和酸碱性主要与Fe3成矿期的沉积微相有关:酸性矿石产于铁质岩页岩夹砂岩微相;自熔性和碱性矿石产于铁质岩页岩夹灰岩微相。矿石品位以产于铁质岩页岩夹砂岩微相中的最高。
The study of stratigraphic sequence,rock assemblage,sedimentary structure,biological fossil,authigenic minerals and trace elements of 33 columnar sections of sedimentary facies in this area were suggested. Devonian sedimentary iron ores of west Hubei occurred in marine offshore,and ore tended to deposit in slope zone of the offshore,main ores placed in microfacies of limestone interbeding shale,sand stone. The tenor and acid-alkali properties of ore related to the microfacies of Fe3 bed forming stage: acid ores existed in the microfaies of chalybeate-shale interbeding sandstone,but self-melting and alkali ores in the microfaies of chalybeate-shale interbeding limestone.
The study of stratigraphic sequence,rock assemblage,sedimentary structure,biological fossil,authigenic minerals and trace elements of 33 columnar sections of sedimentary facies in this area were suggested. Devonian sedimentary iron ores of west Hubei occurred in marine offshore,and ore tended to deposit in slope zone of the offshore,main ores placed in microfacies of limestone interbeding shale,sand stone. The tenor and acid-alkali properties of ore related to the microfacies of Fe3 bed forming stage: acid ores existed in the microfaies of chalybeate-shale interbeding sandstone,but self-melting and alkali ores in the microfaies of chalybeate-shale interbeding limestone.
引文
[1]廖士范.中国宁乡式铁矿的岩相古地理条件及其成矿规律的探讨[J].地质学报,1964,44(1):68-80.
[2]傅家谟.鄂西宁乡式铁矿的相与成因[J].地质学报,1961,41(2):110-118.
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[4]曾允孚,张锦泉,刘文均,等.中国南方泥盆纪岩相古地理与成矿作用[M].北京:地质出版社,1993:1-6.
[5]胡宁,徐安武.鄂西宁乡式铁矿分布层位岩相特征与成因探讨[J].地质找矿论丛,1998,13(1):40-47.
[6]刘宝珺,许效松,潘杏南,等.中国南方古大陆沉积地壳演化与成矿[M].北京:科学出版社,1993:121-124.
[2]傅家谟.鄂西宁乡式铁矿的相与成因[J].地质学报,1961,41(2):110-118.
[3]徐安武,胡宁,曾波夫.岩相古地理文集[M].北京:地质出版社,1992:127-172.
[4]曾允孚,张锦泉,刘文均,等.中国南方泥盆纪岩相古地理与成矿作用[M].北京:地质出版社,1993:1-6.
[5]胡宁,徐安武.鄂西宁乡式铁矿分布层位岩相特征与成因探讨[J].地质找矿论丛,1998,13(1):40-47.
[6]刘宝珺,许效松,潘杏南,等.中国南方古大陆沉积地壳演化与成矿[M].北京:科学出版社,1993:121-124.