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《Earth Science》 2018-07
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Zircon U-Pb Chronology,Geochemistry of the Indonesian Granitic Rocks from Northern Yuechengling Batholith in Guangxi-Hunan Junction

Cheng Shunbo;Fu Jianming;Cui Sen;Lu Youyue;Ma Liyan;Liu A'sui;Wuhan Center of Chinese Geological Survey;Research Center of Granitic Diagenesis and Mineralization,Chinese Geological Survey;  
The temporal and spatial distribution of Indonesian granitoid in northern Yuechengling batholith is still uncertained.In this paper,a compilation of petrology,zircon U-Pb chronology,geochemistry and Nd-Hf isotopes was used on the granitoid to solve this uncertainty.The result shows Indonesian granitoid spreads in north area of the border with the age of 236-222 Ma,and mainly consists of medium to fine grained tourmaline-bearing monzogranites,with accessory minerals assemblage of zircon,zoisite(and/or clinozoisite),apatite and garnet.The granitic samples have characteristics of high SiO_2,alkaline,low CaO,MgO,P_2O_5 contents,and weak to strong peraluminous(A/CNK=1.07-1.17),with enrichment of Rb,Th,U and strong depletion of Ba,Sr,Eu,Nb,Ti elements.Source of early stage of Indonesian granitic rocks mainly consisting of metagreywackes,with small amount of new crustal component.Those of late stage are inhomogeneous mixing of metagreywackes and metapelites.Granitic rocks of both stage have stable high negativeε_(Nd)(t)(-9.3--10.6)andεHf(t)(-5.4--11.9)ratios with source's average crustal residence age of ca 1.8 Ga.Integrated with Indonesian tectonic involvement of South China,formation of granitic magma is perhaps due to dehydration melting of mica-riched metasediments during post-orogenic thickenedcrust environment,migration and emplacement of the magma is controlled by relaxation of deep fault adjacent to the batholith.
【Fund】: 中地质调查局项目(Nos.121201009000150002 121201009000150012)
【CateGory Index】: P588.121
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