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TitleControls on the ore fertility of arc magmas
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LicencePlease note the adoption of the Open Government Licence - Canada supersedes any previous licences.
AuthorGrondahl, C; Tsay, A; Zajacz, Z
SourceTargeted Geoscience Initiative 5, Grant Program interim reports 2018-2019; by Benn, D; Brenan, J M; Fuller, K; Grondahl, C; Layton-Matthews, D; Leybourne, M I; Linnen, R; Martins, T; Milidragovic, DORCID logo; Moynihan, D P; Mungall, J E; Nixon, G T; Padget, C D W; Pattison, D R M; Rempel, K U; Scanlan, E J; Scoates, J S; Tsay, A; Voinot, A; Van Wagoner, N A; Weston, R; Williams-Jones, A E; Woods, K; Zajacz, Z; Geological Survey of Canada, Open File 8620, 2019 p. 74-80, https://doi.org/10.4095/315007 Open Access logo Open Access
Year2019
PublisherNatural Resources Canada
Documentopen file
Lang.English
Mediaon-line; digital
RelatedThis publication is contained in Targeted Geoscience Initiative 5, Grant Program interim reports 2018-2019
File formatpdf (Adobe® Reader®)
AreaAndes; Chile; Argentina
Lat/Long WENS -73.0000 -69.0000 -33.0000 -40.0000
Subjectseconomic geology; Science and Technology; mineral deposits; porphyry deposits; copper; molybdenum; ore mineral genesis; mineralization; tectonic setting; magmatism; magmas; inclusions; olivine; sulphides; mass spectrometer analysis; sulphur; models; partial melting; mantle; Southern Volcanic Zone; San José Volcano; Maipo Volcano; Planchon Volcano; Los Hornitos Volcano; Antuco Volcano; Llaima Volcano; Villarrica Volcano; Los Bronces Deposit; El Teniente Deposit; Methodology
Illustrationslocation maps; plots
ProgramTargeted Geoscience Initiative (TGI-5) Knowledge Management Coordination
Released2019 08 29
AbstractContinental arc magmas represent the parental igneous systems of porphyry Cu-Mo deposits. Studies exploring the fertility of these arcs are often based on global data sets or imperfect analogue settings such as oceanic basalts. We seek to refi ne our understanding of continental arc magmatism in an economic context by sampling a suite of volcanoes in the Andean Southern Volcanic Zone (SVZ). Our sample suite extends from thick crust and the presence of world-class porphyry Cu deposits in the north to a barren south with thin crust. The most primitive olivine-hosted silicate melt inclusions from these samples were analyzed by laser ablation inductively coupled plasma mass spectrometry for major and trace elements including S, Cu, Mo, and Ag. The quantitative analysis of S in silicate melt inclusions by Laser Ablation Inductively Coupled Plasma Mass Spectrometry (LA-ICP-MS) required extensive analytical method development, which constitutes a significant part of this study. The application of non-modal batch melting models demonstrates that the partial melting of a sulfide-bearing primitive or depleted mantle source is capable of generating the observed ore metal concentrations in the SVZ magmas and that there is no significant difference in the metal endowment of the barren and fertile segments of the arc. On the other hand, magmas in the fertile north exhibit significantly higher S concentrations.
Summary(Plain Language Summary, not published)
The Targeted Geoscience Initiative (TGI) is a collaborative federal geoscience program that provides industry with the next generation of geoscience knowledge and innovative techniques, which will result in more effective targeting of buried mineral deposits. This compendium is the result of the Grant Recipients 2018-2019.
GEOSCAN ID315007

 
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