Volume 10 Issue 2
Jan.  2021
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Zhen Zheng, Yanjing Chen, Xiaohua Deng, Suwei Yue, Hongjin Chen, Qingfei Wang. Tourmaline geochemistry and boron isotopic variations as a guide to fluid evolution in the Qiman Tagh W-Sn belt, East Kunlun, China[J]. Geoscience Frontiers, 2019, 10(2): 569-580. doi: 10.1016/j.gsf.2018.04.007
Citation: Zhen Zheng, Yanjing Chen, Xiaohua Deng, Suwei Yue, Hongjin Chen, Qingfei Wang. Tourmaline geochemistry and boron isotopic variations as a guide to fluid evolution in the Qiman Tagh W-Sn belt, East Kunlun, China[J]. Geoscience Frontiers, 2019, 10(2): 569-580. doi: 10.1016/j.gsf.2018.04.007

Tourmaline geochemistry and boron isotopic variations as a guide to fluid evolution in the Qiman Tagh W-Sn belt, East Kunlun, China

doi: 10.1016/j.gsf.2018.04.007
Funds:

This is a contribution from the Working Group on Mineral Deposits in Collisional Orogens (IAGOD) and has been financially supported by the National Basic Research Program of China (No. 2014CB440800), China Geological Survey Bureau (No. 1212011140056).

  • Received Date: 2017-06-01
  • Rev Recd Date: 2018-03-10
  • Publish Date: 2021-01-07
  • The Qiman Tagh W-Sn belt lies in the westernmost section of the East Kunlun Orogen, NW China, and is associated with early Paleozoic monzogranites, tourmaline is present throughout this belt. In this paper we report chemical and boron isotopic compositions of tourmaline from wall rocks, monzogranites, and quartz veins within the belt, for studying the evolution of ore-forming fluids. Tourmaline crystals hosted in the monzogranite and wall rocks belong to the alkali group, while those hosted in quartz veins belong to both the alkali and X-site vacancy groups. Tourmaline in the walk rocks lies within the schorl-dravite series and becomes increasingly schorlitic in the monzogranite and quartz veins. Detrital tourmaline in the wall rocks is commonly both optically and chemically zoned, with cores being enriched in Mg compared with the rims. In the Al-Fe-Mg and Ca-Fe-Mg diagrams, tourmaline from the wall rocks plots in the fields of Al-saturated and Ca-poor metapelite, and extends into the field of Li-poor granites, while those from the monzogranite and quartz veins lie within the field of Li-poor granites. Compositional substitution is best represented by the MgFe-1, Al(NaR)-1, and AlO(Fe(OH))-1 exchange vectors. A wider range of δ11B values from -11.1‰ to -7.1‰ is observed in the wall-rock tourmaline crystals, the B isotopic values combining with elemental diagrams indicate a source of metasediments without marine evaporates for the wall rocks in the Qiman Tagh belt. The δ11B values of monzogranite-hosted tourmaline range from -10.7‰ and -9.2‰, corresponding to the continental crust sediments, and indicate a possible connection between the wall rocks and the monzogranite. The overlap in δ11B values between wall rocks and monzogranite implies that a transfer of δ11B values by anataxis with little isotopic fractionation between tourmaline and melts. Tourmaline crystals from quartz veins have δ11B values between -11.0‰ and -9.6‰, combining with the elemental diagrams and geological features, thus indicating a common granite-derived source for the quartz veins and little B isotopic fractionation occurred. Tourmalinite in the wall rocks was formed by metasomatism by a granite-derived hydrothermal fluid, as confirmed by the compositional and geological features. Therefore, we propose a single B-rich sedimentary source in the Qiman Tagh belt, and little boron isotopic fractionation occurred during systematic fluid evolution from the wall rocks, through monzogranite, to quartz veins and tourmalinite.
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