Sulfur, Lead Isotope Composition Characteristics and the Relevant Instructive Significance of the Lamuyouta Sb（Au） Deposit, South Tibet

Abstract

Abstract:

Lamuyouta Sb (Au) deposit is located in the eastern section of SbAu metallogenic belt, south Tibet The ore body mainly occurs at the contact between the strata of the Middle Jurassic Zhala Formation and diabase (allgovite) veins. Based on the analysis of geological and oreforming conditions, this paper systematically focuses on the composition characteristics of S, Pb isotopes in the sulfide ore minerals, as well as a comparison of S, Pb isotope composition among other typical ore deposits developed in the same regional metallogenic belt. In addition, it also discusses the sources of the oreforming materials. Studies have shown that the composition of S isotope in sulfide ore minerals has a narrow variation range and the δ³⁴SΣS in the oreforming hydrothermal system is about 0, which is similar to other typical ore deposits developed in regional metallogenic belt, south Tibet. It is estimated that the sulfur origin is closely related to the magmatic sulfur. The isotopic composition of ore lead is varied greatly and belongs to anomalous lead, which constitutes a secondary isochron of lead. And then, it is calculated that the age about the lead with radiogenic source is 1,638 Ma, which inverts twostage evolution process of ore lead. Therefore, it is speculated that they sourced from ancient crystalline basement of upper continental crust, in order to provide some help for the study of HimalayanTethyan antimonygold metallogenic belt in Tibet.

Key words: isotopic composition, source of oreforming materials, sb (Au) deposit, Lamuyouta, Tibet

DU Ze-Zhong, GU Xue-Xiang, LI Guan-Qing, ZHANG Yong-Mei, CHENG Wen-Bin, JING Liang-Bing, ZHANG Xin-Guo. Sulfur, Lead Isotope Composition Characteristics and the Relevant Instructive Significance of the Lamuyouta Sb（Au） Deposit, South Tibet[J]. Geoscience, 2011, 25(5): 853-860.

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