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Distribution and origin of brine-type li-rb mineralization in the Qaidam Basin,NW China

Science China Earth Sciences 2022年第3期65卷 477-489页

作者： Jiansen li Tingwei li Yunqi MA Fukun CHEN School of Earth and Space Sciences University of Science and Technology of ChinaHefei 230026China Key Laboratory of Comprehensive and Highly Efficient Utilization of Salt Lake resources Qinghai Institute of Salt LakesChinese Academy of SciencesXining 810008China Qinghai Provincial Key Laboratory of Geology and Environment of Salt Lakes Xining 810008China

The Qaidam Basin on the Qinghai-Tibet Plateau is well endowed with a variety of critical metals,such as li and ***,little is known about the distribution,source,and enrichment mechanisms of these *** this paper,we present results of systematic geochemical and H-O-B isotopic analyses of brines in the Tertiary and Quaternary sediments of the Qaidam *** results reveal that the paleobrines from oil-bearing anticlines at Dafengshan,Nanyishan,Youquanzi,Jiandingshan,and Jianshishan are significantly enriched in li and rb,whose contents are 81.1-128.9 mg L^(-1)and 4.5-29.2 mg L^(-1),respectively,reaching levels of economic *** rb contents(up to 12.5 mg L^(-1))and well-endowment of li also characterize the Dongtai,Xitai,Yiliping,and Senie salt lakes in the Qaidam *** Tertiary paleobrine average inδD andδ18O at-40.7‰and 2.84‰,*** paleobrine with the highest li and rb hasδD andδ^(18)O values close to magmatic ***δ^(11)B values are lower than those of river water but close to those of geothermal fluids,suggesting that replenishment by deep magmatic hydrothermal fluid is most likely the key mechanism for the anomalous enrichment of these elements in the paleobrines,though evaporation and water-rock reactions have contributed to the critical metal *** anomalous enrichment of li and rb in modern salt lake brines is closely related to the input of volcanic geothermal *** relatively high li and rb contents of intercrystalline brines in salt lakes of the western Qaidam Basin and the increase of li and rb contents with increasing depth were caused by upwelling of local paleobrines along the fault zones.

关键词： li and rb resources Paleobrine Salt lake brine Hydrogen H-O-B isotopes Qaidam Basin

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