Geology and S-, Pb-isotopic Geochemistry of the Jiashi Sandstone-type Copper Deposit, Xinjiang, China

Abstract

Abstract:

The Jiashi copper deposit, located in Cenozoic piedmont basin system of southwestern Tianshan in Xinjiang, is an important sandstone-type copper deposit which has been discovered and mined recently.The ore bodies are tabular or stratiform in shape and occur in Neogene lightgrey detritusbearing calc-sandstone.The sulfide minerals in the ores are mainly chalcocite, fewer pyrite and sphalerite.Bornites occur at the deep part of the ore bodies.The ore shows disseminated, lumpish and nodular structures, and the sulfide minerals replaced the cemented calcites in the sandstone and formed a cemented texture.The ore δ³⁴S_V-CDT varies from -33.4‰ to -24.6‰.The ²⁰⁶Pb/²⁰⁴Pb, ²⁰⁷Pb/²⁰4Pb and ²⁰⁸Pb/²⁰⁴Pb of ore sulfide vary from 18.376 to 18.607, 15.612 to 15.655 and 38.475 to 38.747, respectively.It is suggested that the Jiashi copper mineralization was a replacement of the sandstone by copperbearing basin fluid (underground water).The ore bodies formed during late diagenetic stage of the sandstone in Paleogene.The ore sulfur was derived from sulfate reduced by bacteria and the composition of the Pb isotope indicates that the metal were originated from the erosion source area around the sedimentary basin.

Key words: ore geology, S and Pb-isotopes, sandstone-type copper deposit, Jiashi copper deposit, Xinjiang

CLC Number:

P618.41
P597

WANG Si-Cheng,XUE Chun-Ji,LI Zhi-Dan. Geology and S-, Pb-isotopic Geochemistry of the Jiashi Sandstone-type Copper Deposit, Xinjiang, China[J]. Geoscience, 2011, 25(2): 219-227.

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Geology and S-, Pb-isotopic Geochemistry of the Jiashi Sandstone-type Copper Deposit, Xinjiang, China

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