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《Journal of Jilin University(Earth Science Edition)》 2007-01
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Geochemistry and Tectonic Setting of Miocene Granitoids Near Gulou Area,Gangdise Belt

HE Zhong-hua,YANG De-ming,WANG Tian-wuCollege of Earth Sciences,Jilin University,Changchun 130061,China  
Located at both sides of the large,NNE trending Damxung-Lhasa extension fault,the Gulou granitoids belong to part of the Nyainqentanglha granites in the Gangdise tectonic belt.The main rock types include porphyritic granodiorite,porphyritic granite,biotite adamellite and garnet-granitite.Their KAr dating age are about 11 Ma,revealing that the Gulou granitoids were formed in the Miocene epoch.The Gulou granitoids are high in SiO2,Al2O3 and K2O+Na2O,and are low in FeO+Fe2O3,MgO and CaO,showing the features of metaluminous high-K calc-alkaline granites.They are also LREE-rich,HREE-depletion,have obvious Eu negative anomaly;LILE-rich and HFSE-depletion.In the curves of the trace element distribution patterns normalized by the primitive mantle,they are Rb,Th-rich and Nb,Ta,Ba,Sr,Ti-depletion.These Miocene granitoids were interpreted to be formed in a post-collisional tectonic setting and to have a close relationship with the E-W crustal extension.They were resulted from the crustal partial melting related to crustal extension and plateau uplifting post the collisional orogeny.
【Fund】: 国土资源部地质调查项目(200213000013);; 吉林大学“985”工程项目
【CateGory Index】: P588.1
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