Sulfur isotopic characteristics of the Zhaxikang Sb–Pb–Zn–Ag deposit in southern Tibet

作者：Da Wang, Youye Zheng, Ryan Mathur, H. Ren · 发表于：Australian Journal of Earth Sciences · 年份：2020 · DOI：10.1080/08120099.2020.1762738 · 被引用次数：6 · 研究领域：Geological and Geochemical Analysis、earthquake and tectonic studies、Geochemistry and Geologic Mapping

The Zhaxikang Sb–Pb–Zn–Ag deposit is the only super-large deposit in the North Himalayan Metallogenic Belt, but its genesis is debated. Genetic models include hot springs, magmatic-hydrothermal fluids and sedimentary exhalative overprinted by hydrothermal fluids. Here, we present sulfur isotopic data to constrain the genetic models for this deposit. The δ34SV-CDT values of sulfides in the first pulse of mineralisation range from 7.8 to 12.2‰ (average = 10.7‰), and in the second pulse of mineralisation have lower δ34S values of 4.5–11.3‰ (average = 8.5‰), suggesting the sulfur source for the first pulse of mineralisation is mainly seawater sulfur mixed with some mantle-derived sulfur, whereas the second pulse of mineralisation originated from mantle-derived sulfur and sulfur from earlier formed sulfides and wall rocks. Together with previously published Fe–Zn–Cd isotope evidence for the Zhaxikang deposit and regional S isotopic and geochronological data, the new data suggest that the first pulse of mineralisation is related to multiple seafloor volcanic events during the synsedimentary period (220–130 Ma) with submarine hydrothermal sedimentation (metasomatism) genesis that is overprinted by the second pulse of mineralisation associated with the magmatic-hydrothermal activity during the post-collision period (25 Ma to now).KEY POINTSThe Zhaxikang Sb–Pb–Zn–Ag deposit, a super-large deposit in the North Himalayan Metallogenic Belt, is the product of overprinting hydrothermal eve...