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Carbon and oxygen isotope constraints on mantle fluidinvolvement in the mineralization of the Huize super-large Pb-Zn deposits, Yunnan Province, China

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  • Chemistry
  • Earth Science

Abstract

PII: S0375-6742(03)00149-3 ELSEVIER Available online at www.sciencedirect.com SCI I=NC E[ ~_~DI FI ECT e Journal of Geochemical Exploration 78-79 (2003) 637-642 JOURNAL OF GEOCHEMICAL EXPLORATION www.elsevier.com/locate/j geoexp Abstract Carbon and oxygen isotope constraints on mantle fluid involvement in the mineralization of the Huize super-large Pb-Zn deposits, Yunnan Province, China Z.L. Huang a'b'*, W.B. Li a'c, J. Chen d, R.S. Han a, C.Q. Liu a, C. "~ a,c AU , T. Guan a aInstitute of Geochemistry, Chinese Academy of Sciences, Guanshui Road 73, Guiyang 550002, China b The School of Earth Sciences, University of Leeds, Leeds LS2 9JT, UK °Graduate School, Chinese Academy of Sciences, Be~/ing 100039, China dHuize Pb-Zn Mine, Yunnan 654211, China Abstract The Huize super-large Pb-Zn deposits of Yunnan Province, China are characterized by high Pb-Zn grade (Pb + Zn mostly higher than 25-35%) and the abundance of associated useful elements (Ag, Ge, Cd, In, and Ga, etc.). Calcite is the only vein mineral in primary ores in the orefield. This paper analyzes the carbon and oxygen isotopic compositions of 21 calcites and 4 ore-hosting strata (Clb). The g13CpDB and 61SOsMow of calcites are --2.1-3.5 %0 and 16.7-18.6 %0, respectively and fall within a narrow range between primary carbonatite and marine carbonate (or Clb) in the diagram of Sl3CpDB VS. 81SOsMow . In combination with other geological and geochemical data, we suggest that the ore-forming fluids represent crustal-mantle fluid mixing. We believe that fluids formed from degassing of magma, accompanying magmatism of the Permian Emeishan basalts, were involved in the mineralization of the Huize super-large Pb-Zn deposits. © 2003 Elsevier Science B.V. All rights reserved. Keywords: The Huize Pb-Zn deposits; C and O isotope; Ore-forming fluids; Permian Emeishan basalts 1. Introduction More than 400 Pb-Zn- (Ag) ore deposits and ore spots have been found in the S ichuan-Yunnan- G

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