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《Acta Petrologica Et Mineralogica》 2017-03
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Mineral chemistry of biotites from the granodiorite porphyry around the Jinjiwo copper deposit in the Jiurui ore district: Implications for petrogenesis and mineralization

DU Hou-fa;LAI Tian-gong;JIANG Yuan-yuan;FAN Peng-fei;GONG Wei-qiang;State Key Laboratory Breeding Base of Nuclear Resources and Environment, East China Institute of Technology;Faculty of Earth Sciences, China University of Geosciences;No.240 Research Institute,CNNC;No.267 Geological Party,Bureau of Geology;No.230 Research Institute,CNNC;Chengmenshan Copper Mine of Jiangxi Copper Corporation;  
Based on detailed petrographical and mineralogical compositional features of biotite from the granodiorite porphyry around the Jinjiwo deposit in the Jiurui ore district,the authors not only established the physicochemical conditions of the mineral formation but also explored its significance for rock and ore formation.Major element composition of the biotite phenocrysts of the samples was measured by the electron probe micro-analyzer(EPMA).The Ti content and the Mg/(Mg + Fe) ratios of the biotite fromthe Jinjiwo granodiorite porphyry are0.44 ~0.47 apf u(atoms per formula unit) and 0.58 ~0.62,respectively,and the compositions of these biotite are plotted in both the domain of the primary magmatic biotite and that of the Mg-rich biotite.These features suggest that the biotite phenocrysts of the samples are all eastonite,and that these analyzed biotites display the Mg-rich and Fe-poor characteristics.The oxidation coefficient and the MF values of biotites are 0.31 ~0.67 and 0.38 ~0.41,respectively.Biotite has 13.27%~ 14.28%MgO,3.59%~ 8.93%K_2O,0.26%~ 3.28%Na_2O,15.74%~17.30%FeO,3.93%~4.19%TiO_2,and 13.52%~ 14.19%Al_2O_3,respectively.It contains about 2 00 ~2.24 apfu of tetrahedral Al~(Ⅳ) and 0.15 ~0.41 apfu of octahedral Al~(Ⅵ).The T Al content of biotite can be used to figure out the solidification pressure of the granitoid.Considering the composition of biotites together with experi mental results of the former research,whichfalls on or above Fe_2O_3-Fe_3O_4 buffer in the Fe~(3+)-Fe~(2+)-Mg diagram,the authors consider that the biotites from granodiorite porphyry in the study region were crystallized under the condition of temperatures 734~748℃ and pressures 71 ~89 MPa,corresponding to solidification depth 2 7 ~3.3 km The above characteristics suggest that the Jinjiwo granodiorite porphyry belongs to high potassium Ca-alkaline series,showing the typical syntexis type(or Ⅰ+ype) granitoid derived from a crust-mantle mixing source,and that the pluton was formed in a relatively high oxygen fugacity environment,which was beneficial to copper mineralization.
【Fund】: 核资源与环境重点实验室开放基金项目(NRE1309);; 中国地质调查局研究项目(ZR2013000018);; 创新创业项目(2310400136)~~
【CateGory Index】: P578.959;;P588.13
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