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dc.contributor.authorGilmer, A.
dc.contributor.authorSparks, R.
dc.contributor.authorBlundy, J.
dc.contributor.authorRust, A.
dc.contributor.authorHauff, F.
dc.contributor.authorHoernle, K.
dc.contributor.authorSpencer, Christopher
dc.contributor.authorTapster, S.
dc.date.accessioned2018-12-13T09:12:26Z
dc.date.available2018-12-13T09:12:26Z
dc.date.created2018-12-12T02:46:43Z
dc.date.issued2018
dc.identifier.citationGilmer, A. and Sparks, R. and Blundy, J. and Rust, A. and Hauff, F. and Hoernle, K. and Spencer, C. et al. 2018. Petrogenesis and assembly of the Don Manuel igneous complex, miocene-pliocene porphyry copper belt, Central Chile. Journal of Petrology. 59 (6): pp. 1067-1108.
dc.identifier.urihttp://hdl.handle.net/20.500.11937/72136
dc.identifier.doi10.1093/petrology/egy055
dc.description.abstract

© The Author(s) 2018. The 4.0-3.6Ma Don Manuel igneous complex (DMIC), central Chile, provides a window into igneous processes involved in magma genesis associated with porphyry-style copper mineralization. This study uses petrographic, petrological, geochemical and isotopic data to examine the evolution of magmas fromthemid- to lower-crustal source region to shallow emplacement. The data provide evidence for progressive oxidation of magma during differentiation and ascent, fractionation of Cl from S through degassing, and the late-stage, near-solidus removal of Cl from the system. Magmas of basaltic andesite to rhyolite composition were produced by polybaric differentiation of hydrous parental mafic magmas. Variations in crustal differentiation depths led to variable suppression of plagioclase saturation that is recorded in distinctive strontium versus anorthite evolution patterns. Hydrous, derivative magmas generated over a wide range of pressures were episodically emplaced into the shallow crust at depths between 3.5 and 5 km. Intermediate porphyry dikes closely associated with copper mineralization contain diverse crystal cargoes indicating significant magma mixing. These crystal cargoes represent samples of crystal mush entrained from different depths, as well as crystals originating in different magmas and crystals grown in situ from hybridized magmas. Mafic enclaves containing plagioclase and amphibole compositions that match those of the basaltic andesites occur within biotite tonalite, testifying to magmamingling during ascent. Sulfur and chlorine contents of apatite within the different DMIC units record variable degassing and decoupling of volatile components with sulfur showing variations of three orders of magnitude compared with one order of magnitude for chlorine. The hypabyssal nature of the DMIC affords a detailed, integrated record of magmatic differentiation processes occurring within trans-crustal magmatic systems of the sort thought to characterize many crustal arc settings and play a fundamental role in driving porphyry-style copper mineralization.

dc.publisherOxford University Press
dc.titlePetrogenesis and assembly of the Don Manuel igneous complex, miocene-pliocene porphyry copper belt, Central Chile
dc.typeJournal Article
dcterms.source.volume59
dcterms.source.number6
dcterms.source.startPage1067
dcterms.source.endPage1108
dcterms.source.issn0022-3530
dcterms.source.titleJournal of Petrology
curtin.departmentSchool of Earth and Planetary Sciences (EPS)
curtin.accessStatusFulltext not available


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