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Shahabi Far, Maryam, Samson, Iain M, Gagnon, Joel E, Good, David J, Linnen, Robert L, Ames, Doreen (2019) Evolution of a Conduit System at the Marathon PGE–Cu Deposit: Insights from Silicate Mineral Textures and Chemistry. Journal of Petrology, 60 (7) 1427-1460 doi:10.1093/petrology/egz035

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Reference TypeJournal (article/letter/editorial)
TitleEvolution of a Conduit System at the Marathon PGE–Cu Deposit: Insights from Silicate Mineral Textures and Chemistry
JournalJournal of Petrology
AuthorsShahabi Far, MaryamAuthor
Samson, Iain MAuthor
Gagnon, Joel EAuthor
Good, David JAuthor
Linnen, Robert LAuthor
Ames, DoreenAuthor
Year2019 (July 1)Volume60
Page(s)1427-1460Issue7
PublisherOxford University Press (OUP)
DOIdoi:10.1093/petrology/egz035Search in ResearchGate
Mindat Ref. ID176547Long-form Identifiermindat:1:5:176547:6
GUID226d93cb-2229-432b-af64-a0f4fed3926a
Full ReferenceShahabi Far, Maryam, Samson, Iain M, Gagnon, Joel E, Good, David J, Linnen, Robert L, Ames, Doreen (2019) Evolution of a Conduit System at the Marathon PGE–Cu Deposit: Insights from Silicate Mineral Textures and Chemistry. Journal of Petrology, 60 (7) 1427-1460 doi:10.1093/petrology/egz035
Plain TextShahabi Far, Maryam, Samson, Iain M, Gagnon, Joel E, Good, David J, Linnen, Robert L, Ames, Doreen (2019) Evolution of a Conduit System at the Marathon PGE–Cu Deposit: Insights from Silicate Mineral Textures and Chemistry. Journal of Petrology, 60 (7) 1427-1460 doi:10.1093/petrology/egz035
In(2019, July) Journal of Petrology Vol. 60 (7) Oxford University Press (OUP)
Abstract/NotesAbstract
The Marathon platinum group element (PGE)–Cu deposit is hosted by the Two Duck Lake Gabbro of the Mesoproterozoic Coldwell Complex, Canada, and comprises three zones of mineralization, which have different textural, mineralogical and geochemical characteristics. The Footwall Zone occurs at the base of the Two Duck Lake Gabbro, at the contact with the Archean country rocks. The Main Zone occurs within the Two Duck Lake Gabbro, above the Footwall Zone. The W Horizon is an extraordinarily PGE-enriched zone that is characterized by very low Cu/Pd values, less pyrrhotite, and appreciably more bornite than the Footwall and Main zones. It occurs above Main Zone-equivalent mineralization in the southern half of the Two Duck Lake intrusion. Silicate mineral textures and chemistry reveal that the Marathon deposit formed in a dynamic magma conduit system with a complex magma evolution history. The deposit developed into three zones as a result of the multiple pulses of compositionally different magmas. Plagioclase commonly shows resorption surfaces with overgrowths and the anorthite content and concentrations of trace elements such as Fe, Sr, Ba, and rare earth elements in plagioclase change significantly across these surfaces. In rocks that contain sulfide minerals, plagioclase crystals have been partly resorbed and the resorbed rims are Ca-enriched and intergrown with sulfide mineral inclusions. These rims contain higher base-metal and sulfur contents and are light rare earth element-enriched compared with the primary plagioclase. These characteristics indicate input of a separate sulfide-enriched melt with a different composition compared with that from which the primary plagioclase crystallized. Additional evidence for the involvement of slightly different magmas during evolution of the three mineralized zones is derived from variations in pyroxene chemistry (e.g. higher Fe, lower Mg, V, and Sc) between the Footwall Zone and the other two zones and the absence of inverted pigeonite from the W Horizon. The PGE enrichment occurred at depth prior to intrusion and late-stage PGE-rich sulfide-bearing magmas intruded and formed the W Horizon. Therefore, the W Horizon is a zone of mineralization that formed late in the evolution of the Two Duck Lake Gabbro.

References Listed

These are the references the publisher has listed as being connected to the article. Please check the article itself for the full list of references which may differ. Not all references are currently linkable within the Digital Library.

Ames (2016) , 52
Arndt (2003) Economic Geology Geochemistry and origin of the intrusive hosts of the Noril’sk–Talnakh Cu–Ni–PGE sulfide deposits 98, 495
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Not Yet Imported: - report : 10.4095/106630

If you would like this item imported into the Digital Library, please contact us quoting Journal ID
Good (2010) , 1
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