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云南景谷半坡含钛磁铁矿成矿地质条件 被引量:1
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作者 于斌 吴夏涛 +2 位作者 王崇军 朱赵勇 彭忠强 《云南地质》 2013年第2期241-243,共3页
半坡磁铁矿位于澜沧江深断裂成矿带,于辉长岩冷凝晚期因重力分异作用而结晶析出,且硅酸盐矿物比磁铁矿晶出更早。
关键词 含钛磁铁矿 岩浆晚期 结晶分异型 辉长岩内部 云南景谷半坡
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Origin and chronology for hornblende gabbroic intrusions in Urad Zhongqi of western Inner Mongolia and their tectonic implications
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作者 WANG Yingde SUN Fengyue +3 位作者 WANG Li ZHANG Gengxin LIU Jinlong Huo Liang 《Global Geology》 2015年第2期88-97,共10页
The Urad Zhongqi mafic intrusions crop out in western Inner Mongolia and are dominated by hornblende gabbro.Zircon LA-ICP-MS U-Pb dating indicates that the mafic pluton was emplaced in the Early Permian(272 ± 3Ma... The Urad Zhongqi mafic intrusions crop out in western Inner Mongolia and are dominated by hornblende gabbro.Zircon LA-ICP-MS U-Pb dating indicates that the mafic pluton was emplaced in the Early Permian(272 ± 3Ma).The hornblende gabbro rocks have low concentrations of Si O2,high total Fe2O3,Mg O,Ni,Co,Sc and Cr.The rocks are characterized by selective enrichment of large ion lithophile elements(LILE) and light rare earth elements(LREE),and depletion in high field strength elements(HFSE)(e.g.Nb,Ta,Zr,Hf,P and Ti).It suggests that they formed from a primary magma generated by the partial melting of lithospheric mantle material had been previously modified by subduction-related fluids.According to the geochemical data and the geology of the region,the authors found that the Early Permian hornblende gabbroic in western Inner Mongolia formed in a post-collisional extensional setting. 展开更多
关键词 Hornblende gabbro western Inner Mongolia Paleo-Asian Ocean post-collisional extensional setting
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