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《Geological Survey and Research》 2004-02
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Magma Mixing Feature of Jizhong Granite in Lushan Mts,Henan Province

LIU Zhen-hong~(1,2), ZHANG Liang~1, YANG Chang-xiu~(1,2), WU Tai-an~(1,2), CUI Xiao-feng~(1,2),REN Jian-de~(1,2), YANG Chang-qing~(1,2) (1. Henan Institute of Geological Servey, Zhengzhou 4500072; 2. Geological Servey, Henan Bureau of Geology and Mineral Resources, Pingdingshan 467021)  
Jizhong granite rock is a compound body forming by two-times magma puls inventions. The chemical compositin is poor in SiO_2, MgO and rich in CaO, Na_2O. It belongs to magmatic granite of high-potassium calc-alkalic rock series. The granite and the dark-coloured micro-grain enclaves in it have the same features of the REE partitioning model, micro-elments. There are good linearity relationship between SiO_2 and Al_2O_3,K_2O,CaO,MgO,FeO~*,TiO_2, and between La-Ce, Nd-Sm, La-Ba, Th/Yb-Ta/Yb. Based on the study of the δ~(18)O, it is suggested that there is a lot of mantle materials dopping into the granite, which means the granite is from mingling of magma. Its formation is related to the intracontinental subduction orogenic movement in the north margin of the North China block.
【Fund】: 中国地质调查局国土资源大调查项目《河南1∶25万平顶山市幅区域地质调查》(200113000013)
【CateGory Index】: P588.1
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