U-Pb Zircon Geochronology of the San Rafael Sn(-Cu) Deposit San Rafael (Peru): Sources of Magmas and Magmatic Evolution
Abstract
The steadily rising demand for Sn metal imposes a need to better understand the factors controlling the distribution and size of granite-related Sn deposits. In this contribution, we employ in situ and high-precision U-Pb zircon geochronology, tools commonly applied to porphyry systems, to study the evolution of the magmatic system associated with the San Rafael Sn(Cu) deposit in southern Peru. The intrusive complex at San Rafael comprises a suite of roughly coeval, reduced peraluminous (S-type) granitic intrusions, and subordinate lamprophyres. The age-spectra of xenocrystic zircon suggest that the oxidized redbeds of the Middle Triassic Mitu Group may had potentially represented the predominant source for the reduced Sn-mineralizing granitic magmas at San Rafael, a hypothesis that is challenged by the very contrasting oxidation states of the two rock units. Our preliminary dataset of high-precision U-Pb zircon dates for three intrusions suggests that the intrusive complex at San Rafael was constructed over timescales of similar to 400 kyr, between similar to 24.41-24.02 Ma. Show more
Publication status
publishedBook title
Proceedings of the 17th SGA Biennial Meeting. Volume 1Pages / Article No.
Publisher
Society for Geology Applied to Mineral DepositsEvent
Organisational unit
09656 - Chelle-Michou, Cyril / Chelle-Michou, Cyril
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