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Genesis of the Jiajika superlarge lithium deposit,Sichuan,China:constraints from He–Ar–H–O isotopes

Acta Geochimica 2023年第3期42卷 517-534页

作者： Tao Liu Hai Wang Shihong Tian Denghong Wang Xianfang Li Xiaofang Fu Xuefeng Hao Yujie Zhang Kejun Hou State Key Laboratory of Nuclear Resources and Environment East China University of TechnologyNanchang 330013China Changsha Uranium Geology Research Institute CNNCChangsha 410007China Hunan Engineering Technology Research Center for Evaluation and Comprehensive Utilization of Associated Radioactive Mineral Resources Changsha 410007China MNR Key Laboratory of Metallogeny and Mineral Assessment Institute of Mineral ResourcesChinese Academy of Geological SciencesBeijing 100037China Geological Survey of Sichuan Province Chengdu 610081China School of Earth Science and Mineral Resources China University of GeosciencesBeijing 10083China

The Jiajika granitic-and pegmatite-type lithium deposit,which is in the Songpan-Garze Orogenic Belt in western Sichuan Province,China,is the largest in *** studies have examined the geochemistry and mineralogy of pegmatites and their parental source rocks to determine the genesis of the ***,the evolution of magmatic-hydrothermal fluids has received limited *** analyzed He–Ar–H–O isotopes to decipher the ore-fluid nature and identify the contribution of fluids to mineralization in the late stage of crystallization *** the Jiajika ore field,two-mica granites,pegmatites(including common pegmatites and spodumene pegmatites),metasandstones,and schists are the dominant rock types *** pegmatites derived from early differentiation of the two-mica granitic magmas before they evolved into spodumene pegmatites during the late stage of the magmatic *** pegmatites have~3He/~4He ratios that vary from 0.18 to 4.68 Ra(mean1.62 Ra),and their~(40)Ar/~(36)Ar ratios range from 426.70 to 1408.06(mean 761.81);spodumene pegmatites have~3He/~4He ratios that vary from 0.18 to 2.66 Ra(mean 0.87Ra)and their~(40)Ar/~(36)Ar ratios range from 402.13 to 1907.34(mean 801.65).These data indicate that the hydrothermal fluids were shown a mixture of crust-and mantle-derived materials,and the proportion of crustderived materials in spodumene pegmatites increases significantly in the late stage of the magmatic ***δ~(18)OH_(2)O–VSMOWvalues of common pegmatites range from 6.2‰to 10.9‰,with a mean value of 8.6‰,andδDV–SMOWvalues vary from-110‰to-72‰,with a mean o f-85‰.Theδ~(18)OH_(2)O–VSMOWvalues of spodumene pegmatites range from 5.3‰to 13.2‰,with a mean of 9.1‰,andδDV–SMOWvalues vary from-115‰to-77‰,with a mean of-91‰.These data suggest that the ore-forming fluids came from primary magmatic water gradually mixing with more meteoric water in the late stage of the magmatic *** on the He–Ar–H–O and other existing d

关键词： He–Ar–H–O isotopes Magmatic-hydrothermal fluids Common pegmatites spodumene pegmatites Jiajika superlarge lithium deposit Sichuan

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