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《Journal of Chengdu University of Technology(Science & Technology Edition)》 2011-01
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Geochemical characteristics and their implications of peraluminous granite in the Jiama deposit,Tibet

QIN Zhi-peng1,WANG Xiong-wu1,TANG Ju-Xing1,2,TANG Xiao-qian1,ZHOU Yun1,PENG Hui-juan1 1.College of Earth Sciences,Chengdu University of Technology,Chengdu 610059,China;2.Institute of Mineral Resources,Chinese Academy of Geological Sciences,Beijing 100037,China  
This paper studies the geochemical characteristics and their implications of the Miocene granite porphyry in the Jiama deposit,Tibet.The results are obtained by means of field geological investigations,petrographic study,bulk rock analysis and isotopic analysis.These results indicate that the Jiama granite porphyry has the characteristics of peraluminous granite.Na2O/K2O is less than 1 and A/CNK is more than 1.1.Corundum standard molecule(w(C-norm)) is more than 1%.Light REE are rich,while heavy REE are scarce.Negative Eu and Ce are extremely inconspicuous.Sr is high,Y and Yb are low,and Sr/Y value is relatively low.It doesnot possess the geochemical characteristics of adakite rock.It is rich in LILE,especially Rb,Cs,Th,U and K,while its HFSE are scarce,especially Sc and Ti.The Pb-Sr-Nd isotopes reveal about the source of materials from the lower crust,which is mixed with the mantle materials(EMⅡ).It is concluded that the Jiama peraluminous granite porphyry is a product of tectonic movements in the early period of the "post-collision" orogenesis of Asia-India Continent.
【Fund】: 国土资源部科学基地协作研究项目(BH0908-3);; 地质调查项目(N0807);; 青藏专项项目(1212010818089);; 西藏华泰龙矿业开发有限公司勘探项目;; 技术开发项目(E0804)”;; 教育部岩石学矿床学国家重点(培育)学科建设项目(SZD0407)共同资助项目
【CateGory Index】: P588.121
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