Granulite Facies Metamorphic Age and Tectonic Implications of BIFs from the Kongling Group in the Northern Huangling Anticline

查看全文 作　　者：[1,2]岑洋;[1,3]彭松柏;Timothy M [3,2]Kusky;[1,2]蒋幸福;[3,2]王璐

机构地区：[1]Faculty of Earth Sciences,China University of Geosciences;[2]State Key Laboratory of Geological Processes and Mineral Resources,China University of Geosciences;[3]Three Gorges Research Center for Geo-hazard,Ministry of Education,China University of Geosciences

出　　处：《Journal of Earth Science》索引2012年第23卷第5期,共11页

基　　金：supported by the Postdoctoral Science Foundation (No. 20100471203);the Ministry of Land and Resources(No. 1212010670104);the National Natural Science Foundation of China (Nos. 91014002, 40821061, 41272242);Ministry of Education of China (Nos. B07039, TGRC201024) 摘　　要：We report preliminary results of a geochemical study on banded iron formations (BIFs) in the Zhaojiayangpo (赵家阳坡) area from the Kongling (崆岭) Group in the northern Huangling (黄陵) anticline, on the northern margin of the Yangtze craton. The CL (cathodoluminescence) images of zircons mostly have sector zoning, fir-tree zoning and patched zoning, and a few show core-rim tex tures with rims having patched zoning. The calculated formation temperatures using the Ti-in-zircon thermometer are 660-808 ℃ (714 ℃ in average), all indicating that the BIFs underwent granulite facies metamorphism. The age of zir-cons with granulite facies metamorphism is 1 990±14 Ma by LA-ICP-MS U-Pb dating, indicating that there was a significant granulite facies tectonothermal event in the northern Huangling anticline in the Paleoproterozoic, which may be related with tectonic thermal events of the metamorphism caused by the assembly of the Columbia supercontinent with South China. Moreover, the REE pattern is characterized by depletion in LREE while relatively flat in HREE, La N /Yb N =0.26, with a positive Eu anomaly (Eu/Eu*=1.59), which reveals its hydrothermal sedimentation origin and it may have formed in the environment of submarine exhalation. 关键词：黄陵背斜变质年龄麻粒岩相硅铁建造群构造 LA-ICP-MS 构造热事件条带状铁建造

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Granulite Facies Metamorphic Age and Tectonic Implications of BIFs from the Kongling Group in the Northern Huangling Anticline

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