Isotopic (Sr, Nd, and Os) compositions of Zhaxikang diabases, southern Tibet: Records of mantle‐plume activity and implications for Zhaxikang Sb–Pb–Zn–Ag mineralization,Geological Journal

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Isotopic (Sr, Nd, and Os) compositions of Zhaxikang diabases, southern Tibet: Records of mantle‐plume activity and implications for Zhaxikang Sb–Pb–Zn–Ag mineralization
Geological Journal ( IF 1.4 ) Pub Date : 2020-04-16 , DOI: 10.1002/gj.3843
Ruyue Li ₁ , Xiang Sun ₁ , Nini Mou ₁ , Chao Li ₂ , Xiuquan Wan ₁ , Miao Yu ₃

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Diabases from the Zhaxikang Sb–Pb–Zn–Ag deposit in southeastern Tibet provide an opportunity to reveal the tempo‐spatial distribution of the recently identified Comei large igneous province and understand the association with Zhaxikang mineralization. Here we present whole‐rock geochemical and Sr–Nd–Re–Os isotopic data on the Zhaxikang diabases. The Zhaxikang diabases have a Re–Os isochron age of 136.1 ± 3.1 Ma. These rocks are characterized by high TiO₂ content (3.0–4.2 wt%) and have alkaline ocean island basalt‐like trace element patterns with initial ⁸⁷Sr/⁸⁶Sr ratios of 0.7060–0.7069, ε_Nd(t) values of 1.3–3.3, and ¹⁸⁷Os/¹⁸⁸Os(t) ratios of 0.12–0.13. The Zhaxikang diabases are part of the Comei large igneous province and were derived from partial melting of enriched garnet‐bearing mantle source and related to interaction of plume melts with subcontinental lithospheric mantle. Our new data provided additional evidence that Zhaxikang Pb–Zn(Ag)‐bearing Mn–Fe carbonate veins were not produced by a sedimentary exhalative event in Triassic–Jurassic rift environment.

更新日期：2020-04-16

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