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矿床地质  2011 

澜沧江铁矿带惠民式-疆峰式铁矿床特征与含铁建造

Keywords: 地质学,条带状含铁建造,澜沧江铁矿带,惠民式铁矿,疆锋式铁矿

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Abstract:

通过对惠民式和疆峰式铁矿的研究,认为它们都是受变质中基性火山岩建造控制的海相火山-沉积型铁矿床,前者兼有条带状含铁建造(BIF)和粒状含铁建造(GIF)的特征,而后者则为条带状含铁建造。它们均具备元古代条带状铁硅建造铁矿的特征,满足形成前寒武纪大型条带状含铁建造的“大型海洋热液供应系统、作为沉积仓储的大陆架体貌及有能力联系这两者的海洋层体”三要素,以及形成大型火山_喷流_沉积型铁矿的条件。赋存惠民式和疆峰式铁矿的元古代澜沧岩群及大勐龙岩群构成了澜沧江铁矿成矿带,其同生喷流沉积_内生蚀变改造-外生淋滤富集的演化特点清楚。澜沧岩群中的惠民式铁矿属火山-沉积苏必利尔湖型铁矿,与锰共生;大勐龙岩群中的疆峰式铁矿为火山-喷流阿尔果马型铁矿,以含少量硫为特征。这两类铁矿床从火山喷流沉积到变质改造等,均可在矿床成因模式中找到相应的位置。研究结果表明,在该区寻找条带状含铁建造铁矿的潜力巨大。

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