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TitleMantle metal mobility: preliminary gold and platinum group element geochemical results
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AuthorLawley, C J M; Jackson, S E; Petts, D C; Savard, D; Pearson, D G; Zhang, S; Zagorevski, A; Kjarsgaard, B A
SourceTargeted Geoscience Initiative: 2018 report of activities; by Rogers, N (ed.); Geological Survey of Canada, Open File 8549, 2019 p. 43-48, (Open Access)
PublisherNatural Resources Canada
Documentopen file
Mediaon-line; digital
RelatedThis publication is contained in Rogers, N; (2019). Targeted Geoscience Initiative: 2018 report of activities, Geological Survey of Canada, Open File 8549
File formatpdf
ProvinceBritish Columbia
NTS104J/12; 104J/13; 104K/09; 104K/10; 104K/11; 104K/12; 104K/13; 104K/14; 104K/15; 104K/16; 104N; 104O/04; 104O/05; 104O/12; 104O/13
Lat/Long WENS-133.7667 -131.7167 59.8167 58.6833
Lat/Long WENS -80.0000 -80.0000 48.5000 48.0000
Subjectseconomic geology; igneous and metamorphic petrology; geochemistry; mineralogy; mineral deposits; sulphide deposits; gold; nickel; mineral potential; mineral exploration; ore mineral genesis; mineralization; ore controls; petrogenesis; mantle; ophiolites; alteration; serpentinization; whole rock analyses; mass spectrometer analysis; scanning electron microscope analyses; isotopic studies; petrographic analyses; ultramafic rocks; chondrites; Canadian Cordillera; Cache Creek Terrane; ore systems approach; metal mobility; platinum group elements (PGE); ultratrace element analyses; Phanerozoic; Mesozoic; Triassic; Paleozoic; Permian; Precambrian; Proterozoic
Illustrationslocation maps; geoscientific sketch maps; photomicrographs; geochemical plots
ProgramKnowledge Management Coordination, Targeted Geoscience Initiative (TGI-5)
ProgramGold ore systems - System Controls - Time and Space, Targeted Geoscience Initiative (TGI-5)
Released2019 03 01
AbstractMantle sulphides are rare but relatively important mineral phases that dominate the chalcophile and/or siderophile element budget of the silicate Earth. The macro- to micro-scale distribution of mantle sulphides and their trace chalcophile and siderophile elements, however, remains poorly understood. Herein we present new laser ablation inductively coupled plasma mass spectrometry (LA-ICPMS) spot and element mapping results for an assemblage of naturally occurring sulphide, alloy, and native metal minerals recovered from ophiolitic mantle peridotite and pyroxenite (Atlin, British Columbia). Sulphide (pentlandite, pyrrhotite, chalcopyrite), alloy (awaruite) and native metal (copper and iron) phases are interstitial to variably serpentinized olivine and pyroxene relicts at the micro-scale. Pentlandite (±pyrrhotite) occurs with magmatic clinopyroxene and is typically replaced by awaruite and native iron, suggesting super-reduced conditions during serpentinization and desulphidation of the low-temperature equilibrated mantle sulphide assemblage rather than the late addition of sulphide minerals during and/or after ophiolite emplacement. Element mapping results further suggest that gold, platinum and other metals were remobilized during serpentinization. New whole-rock nickel sulphide fire-assay (NiS-FA) platinum group element (PGE) results for the same Atlin ultramafic suite, however, yield flat chondrite-normalized profiles that scatter around the composition of the primitive mantle, suggesting that precious metal remobilization was limited to the micro-scale. Future work will focus on the paragenetic history of this ultramafic suite using a combination of whole-rock ultratrace geochemistry and isotopic studies.