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Oxidation Conditions of Granitic Magmas Associated With Porphyry Copper Deposits in the Central Asian Orogenic Belt
Author(s) -
SHEN Ping,
HATTORI KeiKo,
PAN Hongdi,
JACKSON Simon,
SEITMURATOVA Eleonora,
SHEN Yuanchao
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 - 10.1111/1755-6724.12374_49
Subject(s) - chinese academy of sciences , beijing , china , geological survey , geology , library science , geochemistry , earth science , archaeology , geography , geophysics , computer science
Porphyry copper deposits are associated with oxidized felsic magmas (Sillitoe, 2010). Such oxidized magmas are considered to supply metals and S to ore deposits (Hedenquist and Lowenstern, 1994; Hattori and Keith, 2001; Cooke et al., 2005). Ce is 4+ in oxidized conditions and readily incorporated into zircon, which produces positive Ce anomalies. Previous studies show that the Ce/Ce ratios in zircon can be used as a proxy for oxygen fugacity of magmas (e.g., Trail et al., 2012). The ratios successfully discriminate fertile igneous rocks from barren rocks (Ballard et al. 2002; Liang et al., 2006; Qiu et al., 2013; Han et al., 2013). The Central Asian Orogenic Belt (CAOB) hosts porphyry-type deposits with significant range in size including largeand intermediatesize deposits (Figure 1). The CAOB, therefore, presents an opportunity to evaluate the relationship between the oxidation condition and metal-fertility of granitic magmas.