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Discriminating ore fertile and barren granites using zircon Ce and Eu anomalies – Perspective from late Mesozoic (Yanshanian) granites in South China

Published on Oct 1, 2019in Ore Geology Reviews3.387
· DOI :10.1016/J.OREGEOREV.2019.103105
Xingyuan Li2
Estimated H-index: 2
(SYSU: Sun Yat-sen University),
Quanzhou Gao1
Estimated H-index: 1
(SYSU: Sun Yat-sen University)
+ 2 AuthorsChun-Kit Lai12
Estimated H-index: 12
(UTAS: University of Tasmania)
Abstract
Abstract Redox conditions are widely considered to be important to magma fertility, and have been estimated using different proxies, notably the biotite Fe3+/Fe2+ ratios and zircon Ce and Eu anomalies. In this research, we compiled a large number of zircon REE data from both the fertile (Cu–(Au)–Mo, Cu–Pb–Zn, W–Sn, W and Sn) and barren Yanshanian (Jurassic-Cretaceous) granites from South China to test whether zircon REE compositional differences can differentiate various deposit types and discriminate fertile intrusions from barren ones. We propose a modified method to calculate Ce anomalies (CeN/CeN*, chondrite-normalized) using all MREEs and HREEs (except Eu) to calculate CeN*. The zircon Ce anomalies calculated by this method, together with the Eu anomalies (EuN/EuN*) of the Yanshanian granites suggest that those related to Cu–(Au)–Mo mineralization have the highest oxygen fugacity (fO2) (proxied by CeN/CeN* and EuN/EuN*), followed by those related to Cu–Pb–Zn mineralization, and finally by those related to W–Sn, W and Sn mineralization. Furthermore, within a particular Cu–(Au)–Mo mineral district, the ore-related granites have higher fO2 (CeN/CeN*) than the barren ones. Besides, although reducing magmas generally favor Sn mineralization, some of the most-reduced granites in the Sn mineral districts are actually barren, which indicates that an extreme drop of fO2 could inhibit Sn mineralization.
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