New data on associations of platinum-group minerals in placer deposits of British Columbia, Canada
作者： A. Y. Barkov , R. F. Martin , M. E. Fleet , G. T. Nixon , V. M. Levson
DOI: 10.1007/S00710-007-0192-6
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摘要: We have conducted electron microprobe (EMP) analysis of 158 grains platinum-group minerals (PGM; 0.1–1 mm in size) from 11 placer samples collected Holocene fluvial placers and buried paleochannel at various localities British Columbia. These principally comprise Pt-Fe-(Cu) alloy minerals: Fe-rich platinum [ΣPGE:(Fe + Cu Ni) = 3.6–7.6], Pt3Fe-type (isoferroplatinum or platinum), subordinate “Pt2Fe”-type (probably, a compositional variant platinum) the tulameenite-tetraferroplatinum series. Less-abundant are iridium [Ir-dominant Ir-Os-(Pt) alloy] osmium [Os-dominant Os-Ir-(Pt) alloy]. Ruthenium [Ru-dominant Ru-Ir-Os occurs as single grain. One these Pt-Fe is unusually zoned; its core zone is: Pt74.0Fe20.4Cu1.9Ir1.5Rh1.1Pd1.0Os0.08Ru0.01Ni0.01 (in at%) 3.5], rim Pt78.5Fe15.5Cu1.7Ir1.5Rh1.4 Pd1.2Ni0.15Os0.06Ru<0.01 4.8]. This zoning indicates late-stage removal Fe corresponding addition Pt, probably result interaction with late fluid phase. Various combinations minor elements: Ir-Rh, Rh-Pd, Ir-Rh-Pd observed analysed Pt-Fe-Cu alloys. However, Ir-Pd pair appears to be prohibited because crystallochemical factors. Minute PGM inclusions grains, likely derived Tulameen complex, comprise: hongshiite (Pt1.04Pd0.02 Cu0.93), sperrylite (Pt0.93Ir0.03)Σ0.96(As2.02Sb0.01)Σ2.03, hollingworthite-platarsite (Rh0.74 Pt0.21Fe0.02Pd0.02Ir0.01)Σ1.00S0.91As1.10, cuprorhodsite-malanite (Cu0.91Fe0.03Ni<0.01)Σ0.95 (Rh1.06Pt0.89Ir<0.01)Σ1.95S4.10, rare Te-rich isomertieite (Pd10.96Fe0.03)Σ10.99(Sb1.13 Te0.94)Σ2.07As1.93, an unusual Pt-Pd-Rh antimonide [(Pt Pd Rh):(Sb As) 1.2–1.25], related genkinite. may exhibit solid solution extending genkinite toward stumpflite. In addition, 20 diopside [Ca46.4–49.1Mg42.8–48.2Fe3.1–8.1; ≤0.59 wt% Cr2O3] olivine [Fo86.8–91.5 Fa7.9–12.5], PGM-bearing located vicinity were analysed. The ranges silicates comparable those clinopyroxene clinopyroxenite dunite units complex. majority Alaskan-type source rocks, whereas ophiolitic source, associated Atlin ophiolite suggested for deposits area, northern
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