Premium
Geology, Fluid Inclusions, and Isotope Geochemistry of the Jinman Sediment‐hosted Copper Deposit in the Lanping Basin, China
Author(s) -
ZHANG Jinrang,
WEN Hanjie,
QIU Yuzhuo,
ZOU Zhichao
Publication year - 2014
Publication title -
acta geologica sinica ‐ english edition
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.444
H-Index - 61
eISSN - 1755-6724
pISSN - 1000-9515
DOI - 10.1111/1755-6724.12379_67
Subject(s) - chinese academy of sciences , china , geochemistry , geology , isotope geochemistry , geological survey , structural basin , archaeology , geography , geomorphology , isotope , paleontology , physics , quantum mechanics
The Jinman Cu polymetallic deposit (with a reserve of 7.75 million tons ore grading at 2.58 % Cu) is mainly hosted by sandstones and slates of the Jurassic Huakaizuo Formation in the Lanping basin, Southwest China (Li and Fu, 2000; Hou et al., 2008). The orebodies mainly occur as lenses and stratiform, and are hosted in Middle Jurassic Huakaizuo Formation mottled clastic rocks. No igneous rocks have been found nearby. The deposit is apparently different from the sedimenthosted base metal deposits in other parts of the world, and genetically it remain poorly understood (Li and Fu, 2000; He et al., 2009). Most of previous geochemical studies indicated that metallogenic materials and ore fluids were mainly derived from sedimentary rocks of the basin (Xiao et al., 1994; Li and Fu, 2000; Liu et al., 2000, 2001; Wu et al., 2003), whereas some studies argued that the oreforming components mainly derived from the mantle through deep structures (Ji and Li, 1998; Chi and Xue, 2011). In this paper, we present the results of the systematical investigation on the geology, fluid inclusion, and isotopic geochemistry of the Jinman deposit. Furthermore, we discussed the sources of the ore-forming fluids and materials, as well as the mechanism of ore precipitation. All these studies suggested new constraints on the ore genesis, for this deposit, as well as for most of the sediment-hosted Cu deposits in the western Lanping basin.