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《Earth Science》 2017-12
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Petrogenesis and Geological Significance of the North Liuhuangkuang Granodiorite in the West Sement of the Qilian Terrane:Evidences from Geochronology,Geochemistry,and Hf Isotopes

Tao Gang;Zhu Lidong;Li Zhiwu;Ouyang Huizi;Xie Long;Yang Wenguang;Yang Zhen;Institute of Sedimentary Geology,Chengdu University of Technology;State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation,Chengdu University of Technology;  
More geological researchers are focusing on the Neoproterozoic magmatic activities of Qilian Terrane and little chronological and geochemical materials are about the North Liuhuangkuang Granodiorites(NLG)in the western segment of Qilian Terrane.The zircons of rock samples which havedistinct rhythmic growth zoning are long cylindrical and euhedral well,implying the features of magmatic origin.The resultsof dating indicate that the rocks were formed in the Early Neoproterozoic(926±4 Ma).11 samples'new whole-rock geochemical analysis results have SiO_2 content of 59.47%~62.96%,P2 O5 content of0.12%~0.14% with A/CNK values of 1.01~1.15,which showed that the NLG were high-K calc-alkaline with characteristics of I-type.The∑REE content was between 118.80×10-6 and 253.07×10-6,with(La/Yb)Nratio of 7.87~16.17 andδEu(0.89~1.03).The REE diagram showed rightward incline and mid-negative weekly negative Eu abnormity.The NLG were en-riched in large-ion lithophile elements:Rb,Th,U,LREE and depleted in high field strength elements:Nb,Ta,Ti,P.The ratios of Nb/Ta,La/Nb,Nb/U and Sm/Nd show crustal characteristics.The Hf isotopes showed that theεHf(t)of NLG mainly ranged from 0 to 7 and its crustal model ages were between 1 247 Ma and 1 801 Ma.With the regional magmatic activities,the NLG probably were formed in a subduction tectonic environment of continental margin arc and it suggested that the primary magma was derived from the remelting of juvenile crustal materials in Mesoproterozic,experiencinga certain extent of fractional crystallization.Otherwise,the melting of the ancient crust also probably participated the formation of the NLG.The NLG magma activities may the response of the converge of the Rodinia Supercontinental,during the Neoproterozoic,which provided the attribute of the Qilian Terrane with credible research materials.
【Fund】: 冈底斯-喜马拉雅铜矿资源基地调查项目(No.DD20160015);; 中国地质调查项目(No.12120113033004);; 高等学校博士学科点专项科研基金资助项目(No.20125122110010)
【CateGory Index】: P588.12
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