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Key factors controlling the accumulation of the Fe–Ti oxides in the Hongge layered intrusion in the Emeishan Large Igneous Province, SW China
Yan Luan;  Xie-Yan Song;  Lie-Meng Chen;  Wen-Qin Zheng;  Xiao-Qi Zhang;  Song-Yue Yu;  Yu-Wei She;  Xiao-Lin Tian;  Qi-Yu Ran
2014
发表期刊Ore Geology Reviews
卷号57页码:518-538
摘要

The Hongge layered intrusion hosts the largest Fe–Ti–V oxide ore deposit in the central part of the Emeishan Large Igneous Province, SW China. It is divided into Lower Zone (LZ), Middle Zone (MZ) and Upper Zone (UZ) from the bottom to the top. For the LZ, relatively higher Cr (250–3000 ppm) and Ni (50–200 ppm) contents of clinopyroxene, lower εNd259Ma and higher (87Sr/86Sr)259Ma values (− 2.82 to − 0.07 and 0.7057–0.7076, respectively) and plenty of hornblende demonstrate a more primitive parental hydrous magma. In contrast, relatively low Cr (< 150 ppm) and Ni (< 100 ppm) of the clinopyroxene, high εNd259Ma and low (87Sr/86Sr)259Ma values (− 0.32 to 0.49 and 0.7058 to 0.7063, respectively) suggest that the MZ rocks were formed from more evolved, Fe–Ti enriched, and weakly contaminated magmas. MELTS calculation indicates that H2O played a key role in the early crystallization of magnetite and occurrence of abundance of hornblende in the LZ. Whereas, the critical factor for the formation of the massive Fe–Ti oxide layers at the bases of the cyclic units in the MZ is coupling of early crystallization of Fe–Ti oxides from the Fe–Ti highly enriched magma and gravitational resorting and settling of the Fe–Ti oxides. Such magmas were produced by fractional crystallization of olivine and pyroxene in deep-seated magma chamber, and compositional reversals of the cyclic units show repeatedly replenishment of such magmas from deep level. Extensively fractionation during the formation of the LZ and MZ resulted in phosphorus saturation and the formation of the apatite magnetite gabbros in the UZ.

关键词Hongge Layered Intrusion fractional Crystallization parental Magma magma Replenishment footwall Rock Assimilation introduction Of External H2o
收录类别SCI
语种英语
文献类型期刊论文
条目标识符http://ir.gyig.ac.cn/handle/42920512-1/9361
专题矿床地球化学国家重点实验室
作者单位1.State Key Laboratory of Ore Deposit Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550002, China
2.University of Chinese Academy of Sciences, Beijing 100049, China
3.106 Geological Unit, Sichuan Bureau of Geology and Mineral Resources, Sichuan 617000, China
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GB/T 7714
Yan Luan;Xie-Yan Song;Lie-Meng Chen;Wen-Qin Zheng;Xiao-Qi Zhang;Song-Yue Yu;Yu-Wei She;Xiao-Lin Tian;Qi-Yu Ran. Key factors controlling the accumulation of the Fe–Ti oxides in the Hongge layered intrusion in the Emeishan Large Igneous Province, SW China[J]. Ore Geology Reviews,2014,57:518-538.
APA Yan Luan;Xie-Yan Song;Lie-Meng Chen;Wen-Qin Zheng;Xiao-Qi Zhang;Song-Yue Yu;Yu-Wei She;Xiao-Lin Tian;Qi-Yu Ran.(2014).Key factors controlling the accumulation of the Fe–Ti oxides in the Hongge layered intrusion in the Emeishan Large Igneous Province, SW China.Ore Geology Reviews,57,518-538.
MLA Yan Luan;Xie-Yan Song;Lie-Meng Chen;Wen-Qin Zheng;Xiao-Qi Zhang;Song-Yue Yu;Yu-Wei She;Xiao-Lin Tian;Qi-Yu Ran."Key factors controlling the accumulation of the Fe–Ti oxides in the Hongge layered intrusion in the Emeishan Large Igneous Province, SW China".Ore Geology Reviews 57(2014):518-538.
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