Mantle-originated hydrothermal-sedimentary dolostone in the Middle Permian in eastern Junggar Basin,China
Zhang Shuai1,2,3, Liu Yi-Qun1, Li Hong1, Jiao Xin1, Zhou Ding-Wu1
1 State Key Laboratory of Continental Dynamics,Northwest University,Department of Geology, Northwest University,Xi'an 710069,China; 2 Key Laboratory of Alpine Ecology(LAE),Institute of Tibetan Plateau Research,Chinese Academy of Sciences(CAS),Beijing 100101,China; 3 University of Chinese Academy of Sciences,Beijing 100049,China
Abstract：The Middle Permian Lucaogou Formation in Jimusar sag,eastern Junggar Basin,China,deposited in a salt-lake within an intracontinental rift basin,in which magmatic-hydrothermal activities were intensive. Mantle-originated hydrothermal-sedimentary dolostone in lake bottom are discovered. Three types of dolostones are found,including analcime-albite dolostone,silicic dolostone and buddingtonite-albite dolostone. The ore-forming fluid characteristics and detailed formation mechanism are discussed based on micrometer-scale petrographical and isotopic geochemical research. Both petrographic feature and syndepositional deformation have indicated these dolostones are formed in a depositional stage. The dolomites are relatively poor-ordered proto-dolomites,with micron-sized spherical or aciniform morphology,and coexist with hydrothermal minerals that include analcime,buddingtonite,albite and chalcedony. Albite clasts were replaced by dolomites under high temperatures. The remarkably low strontium isotopic composition of the dolostones(av. 0.705687)suggests abundant mantle-originated material in the ore-forming fluid. The dolostones have positive δ13 CPDB values(av. 6.94‰)and negative δ18 OPDB (av.-8.12‰). The calculated formation temperature of the dolomites by using δ18 OPDB is about 25-50 ℃ higher than that of the dolomitic rocks in Lucaogou Formation,based on the assumption that the fluid is the mixture of lake water and mantle-originated hydrothermal fluid. We conclude a possible genetic model that the dolomites precipitated directly from the mantle-originated hydrothermal fluid once it erupted to the lake bottom. We argue that the hydrothermal-sedimentary dolomite is an indispensable genetic type and this study is of great significance for both deciphering the formation rules of dolomite and supplementing the theory of petrogenesis.
Zhang Shuai,Liu Yi-Qun,Li Hong et al. Mantle-originated hydrothermal-sedimentary dolostone in the Middle Permian in eastern Junggar Basin,China[J]. JOPC, 2020, 22(1): 111-128.
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