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Comparison of the Dahongshan Cu‐Fe Deposit with Typical IOCG Deposits Worldwide
Author(s) -
YANG Guangshu,
ZHANG Junwei,
WEN Hanjie,
YAN Yongfeng,
FENG Pengyu
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 - 10.1111/1755-6724.12372_26
Subject(s) - chinese academy of sciences , china , library science , engineering , geography , archaeology , computer science
The iron oxide copper-gold (IOCG) deposits are coppergold (-silver-niobium-platinum group element-rare earth element-uranium) deposits that contain iron oxides (magnetite and/or hematite) more than 20%. Generally, these deposits have the following characteristics: (1) abundant low Ti Fe-oxides; (2) hydrothermal characteristics and structural controls, commonly with breccias; (3) Cu + Au as economic metals; (4) lack of abundant syn-sulfide quartz veins; (5) LREE enrichment and low S sulfides; and (6) a temporal relationship with magmatism, yet no close spatial association with causative intrusions (Groves et al., 2010). Because of their polymetallic nature and the potential of large tonnage at moderate to high grades, the geological features, metallogenic mechanism and prospecting models of the IOCG deposits have attracted much attention (Zhao et al., 2011). The Dahongshan Cu-Fe deposit is an important Fe and Cu resource base in China; it contains about 450 million tonnes (Mt) of Fe (metal) and more than 1.5 Mt of Cu (metal) (grade:0.3-1.2wt.%) (Fig.1), and associated with considerable amounts of Au, Ag, and Co. In recent research, this deposit was suggested to be an important part of the IOCG metallogenic province in the Kangdian region, SW China (Nie et al., 2008; Zhao et al., 2011). Although it was previously considered to be volcanogenic in origin, a model similar to VMS deposits (Qian and Shen, 1990). This paper represents the geological features of the Dahongshan deposit, and points out its similarities and differences to typical IOCG deposits by comparison. 2 Geology of the Dahongshan Deposit