CHEN Xiao-cui1, ZHAO Cheng-hai2, ZHANG Min1, YANG Wu1
(1. Guizhou Institute of Technology, Guiyang 550003, China;
2. Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550081, China)
Abstract: Tengchong–Lianghe tin belt in western Yunnan Province is one of the most important tin mineralization belts in Sanjiang Tethyan metallogenic domain. There are two typical large-scale tin deposits in this belt: Early Teriary Lianghe Lailishan tin deposit and Late Cretaceous Tengchong Xiaolonghe tin deposit. In this study, pyrite samples from the main mineralization stage of the two deposits were selected to analyze S isotopes. The δ34SCDT values of Lailishan and Xiaolonghe tin deposit range from +4.9‰－+6.7‰ (average value at +5.5‰) and +5.0‰－+8.1‰ (average value of +6.3‰), respectively. These data imply that sulphur of the two deposits were mainly derived from magmatic hydrothermal fluids. Combined with previous available data, it’s suggested that the tin mineralization events in Tengchong-Lianghe tin belt are conspicuously contemporaneous with the emplacement of the granites. The granitic magmatism may partly provide ore-forming materials and fluids for tin mineralization of these tin deposits, strongly supporting granite-related origin of these tin deposits.
Keywords: S isotope; Tengchong－Lianghe tin belt; ore-forming fluid; granite
E-mail: cxchyh@163.com
ACTA MINERALOGICA SINICA Vol. 37, No. 6, 2017, Page 705-711
