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Abstract

At the Black Mountain porphyry Cu-Au deposit in the Baguio district, Northern Luzon (Philippines), pre- and synmineralized rocks preserve magmatic and hydrothermal minerals (e.g., plagioclase, amphibole, titanite, and epidote) spanning the complete paragenesis of the deposit. Strontium isotope values in early crystallized plagioclase phenocrysts from all felsic porphyries can be divided into two types. The type-I plagioclase crystals show relatively homogeneous Sr isotope values (0.7035-0.7038, 1σ 87Sr/86Sr values in magmatic amphibole, plagioclase, and hydrothermal epidote in felsic and mafic rocks indicates the addition of mafic magma-derived fluid into the felsic magma-derived fluid. One extra source of fluid (probably derived from wall-rock limestone) was required to generate the highly radiogenic 87Sr/86Sr values of some epidote (0.7038-0.7053). Thus, in situ elemental and Sr isotope variation in minerals from different paragenetic stages can be used to interpret formation process and source for both magmas and hydrothermal fluids.

Item Type:	Article
Authors/Creators:	Cao, M and Hollings, P and Evans, NJ and Cooke, DR and McInnes, BIA and Zhao, K and Qin, K and Li, D and Sweet, G
Journal or Publication Title:	Economic Geology
Publisher:	Economic Geology Publ Co
ISSN:	0361-0128
DOI / ID Number:	https://doi.org/10.5382/econgeo.4701
Copyright Information:	Copyright 2020 Society of Economic Geologists, Inc.
Related URLs:	UTAS Profile: Cooke, DR
Item Statistics:	View statistics for this item

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