西北地质2016，Vol.49Issue(4)：136-145,10.
印度达尔瓦尔克拉通绿岩带BIF型铁矿地质特征及成因分析
Geological Characters and Genesis Analysis of Greenstone-type BIF Iron Deposits in Dharwar Craton,India
摘要
Abstract
India takes up about 7% of iron ore reserves in the world,which is dominated by Pre-cambrian BIF iron.In which,the BIF iron ores occurred within greenstone belt or green schist serve as the most important type of iron deposits in India.The greenstone belts were well devel-oped in Dharwar Craton and South India Shield,where a lots of BIF iron deposits were developed in different strata sequences and rock association.The geochemical characters of BIF deposits in Chitradurga and Kushtagi greenstone belts have been analyzed and discussed in this paper.The results show that these BIFs can be classified into shaleand quartz BIFs by using the limit of 2%Al2 O3 content.And these BIFs show three lithofacies,such as quartzoxide,carbonate or sulfides phases.The maj or and trace elements geochemistry show that these BIFs were formed by the j oint action of terrigenous clastic and volcanic clastic sedimentary.The rare earth elements geo-chemistry shows that these BIFs have negative Ceanomalies and positive Eu anomalies.The dat-ing data of Dharwarcraton suggest that two maj or volcanisms occurred in 2.7~2.6 5 Ga and 2.58~2.54 Ga,and two stages continental accretions happened in 2.7~2.6 Ga and 2.58~2.52 Ga,which caused the formation of Dharwarcraton and related greenstone belts.As for the ore-forming materials source of these BIFs deposits,the Feand SiO2 were came from the high-temper-ature hydrothermal of AMOR,the O2 was sourced from marine biological photosynthesis,and these BIF deposits were formed by the combined action of chemical and clastic sediments under this environment.关键词
达尔瓦尔克拉通/绿岩带/BIF/地球化学/成因Key words
Dharwar/greenstone belt/BIF/geochemistry/genesis分类
天文与地球科学引用本文复制引用
成功,孙卫宾,李尚林,罗彦军,李丹..印度达尔瓦尔克拉通绿岩带BIF型铁矿地质特征及成因分析[J].西北地质,2016,49(4):136-145,10.基金项目
澳洲印度克拉通重要矿床地质背景与成矿规律研究(1212011120325),南亚地区基础地质图件编制与成矿地质背景研究(1212011120333) （1212011120325）
