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《Geology in China》 2017-01
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Genesis and geological implications of the Neoproterozoic A-type granite from the Lugu area, western Yangtze block

YAN Shengwu;BAI Xianzhou;WU Wenxiang;ZHU Bing;ZHAN Qiongyao;WEN Long;YANG Hui;WANG Yuting;Sichuan Institute of Geological Survey;Faculty of Earth Sciences,China University of Geosciences;  
Previous studies have deeply examined the Neoproterozoic I-type and S-type granites on the western margin of theYangtze Plate, whereas very insufficient attention has been paid to A-type granites, and hence their petrogenetic nature and tectonic implications are still controversial. In this paper, the authors report the results of a detailed study of the newly discovered Lugu Atype granites in the Yangtze Plate, using LA-ICP-MS zircon U-Pb geochronology, petrology, and whole-rock geochemistry, with emphasis placed on the petrogenesis and tectonic setting of the A-type granites. The Lugu granitoid consists of alkali feldspar granite and monzonitic granite that yielded zircon U-Pb ages of(806±5) Ma and(815±5) Ma by LA-ICP-MS, respectively. The Lugu granitoid is deduced as the Neoproterozoic magmatic product. The Lugu granitoid is characterized by high SiO_2(71.2%-76.1%), high total alkali values(K_2O + Na_2O values from 6.73% to 8.95%), high K_2O/Na_2O ratios(1.89-3.60)and peraluminous features(A/CNK=1.07-1.49). Both [Fe OT/(Fe OT+Mg O)] versus Si O2 and [(Na_2O+K_2O)-Ca O] versus SiO_2 plots indicate ferroan and alkali-calcic signatures typical of A-type granitoids. The content of rare earth elements of alkali feldspar granite and monzonitic granite is high(∑REE=221×10-6-387×10-6), and both rocks show enrichment of LREE rather than HREE with a right-inclined REE patterns for(La/Yb)Nratios from 3.42 to 9.69. Both type rocks have obvious negative Eu anomaly(δEu=0.10-0.34). Meanwhile, the Lugu granitoid has relative high content of Zr, Nb, Ce and Y with high ratios of Ga/Al, Y/Nb, Yb/Ta and Ce/Nb, showing that it is a typical A_2-type granite. Combined with the data on geochemistry and regional geology, the authors hold that the Lugu Neoproterozoic A_2-type granite was derived from the partial melting of pelitic rock in early Neoproterozoic subduction orogeny.
【Fund】: 中国地质调查局项目“龙门山—滇中成矿带通安和宁蒗地区地质矿产调查”(121201010000150016)资助~~
【CateGory Index】: P588.121
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