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《Geoscience》 2016-03
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Geochronology and Geochemistry of the Wurinitu Granites in Inner Mongolia and Their Geological Implications

YANG Zenghai;WANG Jianping;LIU Jiajun;WANG Shouguang;WANG Qingyi;KANG Shuguang;ZHANG Jiexian;ZHAO Yun;China National Gold Group Corporation;School of Earth Sciences and Resources,China University of Geosciences;Geological Survey Institute of Inner Mongolia;Inner Mongolia Ninth Geological Mineral Exploration Institute;  
The Wurinitu granitoid pluton,located in the northwestern of the Wurinitu Village,Chagan'aobao town,Sunidzuoqi County,Inner Mongolia,is a concealed rock mass and mainly composed of fine to middlefine grained granite and adamellite. Petrography and geochemical characteristics indicate that it belongs to high-K calc-alkaline series. Its SiO_2 contents range from 74. 85 % to 78. 10 %,while K_2O / Na_2O ratios and A / CNK values vary from 1. 45 to 3. 08 and 1. 00 to 1. 21,supposed to a suite of peraluminous rock. Rb,Th and U elements are enriched in the intrusion while Ba,Nb,Sr,P and Ti depleted. REEs show characteristics of obvious negative Eu anomalies( δEu = 0. 22-0. 39) and right-dipping"V"patterns with LREE enrichment.On the basis of LA-ICP-MS U-Pb chronological study of zircons,the U-Pb dating results from the granites are139 Ma implying that they formed in Early Cretaceous,Late Yanshanian stage. Chemically,the granitoidsbelong to A-type,implying that they formed under an extensional tectonic setting. The source compositions of the granites are different,and they are mainly derived from clay-rich pelite with a spot of arenite,resulted from metamorphism.
【Fund】: 中国地质调查局矿产资源调查评价专项“重要示范区带区域成矿系统研究”(1212011085471)
【CateGory Index】: P588.121;P597.3
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