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TitleConvergent margin Ni-Cu-PGE-Cr ore systems: temporal and magmatic evolution
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AuthorNixon, G T; Milidragovic, D; Scoates, J S
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, D; 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. 49-61, https://doi.org/10.4095/315001 (Open Access)
Year2019
PublisherNatural Resources Canada
Documentopen file
Lang.English
Mediaon-line; digital
RelatedThis publication is contained in Benn, D; Brenan, J M; Fuller, K; Grondahl, C; Layton-Matthews, D; Leybourne, M I; Linnen, R; Martins, T; Milidragovic, D; 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; (2019). Targeted Geoscience Initiative 5, Grant Program interim reports 2018-2019, Geological Survey of Canada, Open File 8620
File formatpdf (Adobe® Reader®)
ProvinceBritish Columbia
NTS82E; 82F; 82K; 82L; 82M; 82N; 83D; 83E; 92; 93; 94; 103; 104; 114
Lat/Long WENS-142.0000 -116.0000 60.0000 49.0000
Subjectseconomic geology; geochronology; tectonics; Science and Technology; mineral deposits; sulphide deposits; nickel; copper; chromium; cobalt; mineral exploration; exploration guidelines; ore mineral genesis; mineralization; modelling; tectonic evolution; tectonic setting; plate margins; magmatism; intrusions; emplacement; accretion; terranes; continental margins; radiometric dating; uranium lead dating; argon argon dating; palladium; iron; bedrock geology; lithology; structural features; faults; Canadian Cordillera; Tulameen Intrusion; Polaris Intrusion; Turnagain Intrusion; Quesnellia Terrane; Yukon-Tanana Terrane; Methow Terrane; Cache Creek Terrane; Ancestral North America; Cassiar Terrane; Cassiar Platform; Lay Range Assemblage; Big Creek Group; Ingenika Group; ore systems approach; platinum group elements; convergent margins; Alaskan-type intrusions; Phanerozoic; Mesozoic; Cretaceous; Jurassic; Triassic; Paleozoic; Permian; Carboniferous; Devonian; Silurian; Ordovician; Cambrian; Precambrian; Proterozoic
Illustrationsgeoscientific sketch maps; photomicrographs
ProgramKnowledge Management Coordination, Targeted Geoscience Initiative (TGI-5)
Released2019 08 29
AbstractUltramafic-mafic intrusions at convergent margins contain some of the world's significant Ni-Cu-PGE sulphide deposits and are becoming an increasingly important exploration target. This class of intrusions is well-represented in the accreted arc terranes of the northern Cordillera, particularly the Alaskan-type subclass. In this report, we describe current research on three Alaskan-type intrusions in British Columbia that are variably endowed in magmatic Ni-Cu-PGE mineralization. The goal of this project is to determine the timing of mineralization in relation to the temporal and magmatic evolution of the intrusion and to develop new mineral deposit models as guides for exploration. U-Pb and 40Ar/39Ar geochronological results for the Turnagain intrusion indicate multi-stage assembly of a composite body in the Early Jurassic (ca. 189-185 Ma) during initial accretion of arc terranes to the ancient North American continental margin. Ni(-Co) and Cu-PGE sulphide mineralization is partitioned within separate sub-intrusions that were emplaced during active accretion. A newly investigated zone of Cu-Pd-Pt sulphide mineralization in the Tulameen intrusion bears a strong resemblance to certain 'reef-style' deposits in layered intrusions. Preliminary geochronology results indicate emplacement of the Tulameen intrusive suite in the latest Triassic (ca. 204-206 Ma), coincident with the most prolific Cu-Au porphyry epoch in British Columbia. Investigation of magmatic sulphide occurrences at the Polaris Alaskan-type intrusion was initiated last summer and samples collected during the field season are currently being processed and examined.
GEOSCAN ID315001