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A New Idea of Alteration‐Mineraliazation Zoning in Tongchang Copper Deposit in Yimen, Yunnan Province and its Genesis
Author(s) -
XIAO Shu'an,
LI Feng,
ZHANG Zhifa,
Junnan LÜ
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 - 10.1111/1755-6724.12380_41
Subject(s) - zoning , china , library science , science and engineering , engineering , geography , archaeology , civil engineering , computer science , engineering ethics
Yimen mining is located in the southwest side of southnorth direction tectonic system of the Sichuan Yunnan, the south of Yinmin-Yimen Trough, being close to the Kunyang archi-continent in the east and the YuanmouXinping island arc in the west, which is an important copper resource region. Previous studies are few and old on this mine and are restricted to some brief studies, such as geological features, a small amount of ore bodies, structure, ore-rich stratum and the origin of deposit (Sun, 1995; Wu, 1989; Han et al., 2003; Ran et al., 1993; Sun, 1988; Shi et al., 1988; Ren et al., 1984). Base on careful and detailed field geological research and laboratory analysis, the authors gained new insights into mineralization zoning and the origin of deposit. The authors believe this understanding will be favorable for further prospecting. Yimen copper belt located in E’lachangShizisan gripped between SN Yimen faults and Lvzhijiang faults in the ssouthern section of Kangdian axis. There are Lvzhijiang enormous faults, Tanglang faults and Yimen faults produced in this area, the tectonic belt consist of which. Lots of folds are developed in the region. The main folds include Wanbaochang syncline, Qibulang anticline, Tongchang syncline etc. from east to west. The revealing layers mainly contain Dalongkou Group (Pt2d), Meidang Group (Pt2m), Yinmin Group (Pt2y), Luoxue Group (Pt2l) and E’touchang Group (Pt2e). In particular the Luoxue Group (Pt2l) is the primary ore bed (Fig. 1). Lamprophyre, diabase etc. intrude as dikes and stocks, and constitute the igneous rock in the mining area. The wall rock alteration includes silicification, dolomitization, barytization, as well as albitization, sericitization, choritization etc. near the igneous rock.