MLA-SEM Characterization of Sulphide Weathering, Erosion, and Transport at the Voisey’s Bay Orthomagmatic Ni-Cu-Co Sulphide Mineralization, Labrador, Canada
نویسندگان
چکیده
The Voisey’s Bay nickel-copper-cobalt (Ni-Cu-Co) sulphide deposits constitute a significant resource of orthomagmatic mineralization. are not exposed at the surface except for in small ferruginous gossan (Discovery Hill). subsequent geophysical surveys and diamond drilling led to discovery Ovoid ore body, buried beneath 20 m till, other deeper bedrock. This study was initiated characterize mineralogy these through various stages weathering, erosion, transport. Because samples ranged from bedrock variety surficial sediment types, automated SEM-based identification provided by MLA-SEM system ideal technique quantitatively evaluate mineral distributions different media. derived data indicate that, aside Discovery Hill gossan, mineralization weathered pre-glaciation regolith Mini-Ovoid deposit and, on deposit, massive unoxidized due thin calcite-cemented clay cover. Pentlandite is very preferentially oxidized compared sulphides ore, depths up 10 Conversely, within coarse reject crushed drill cores stored sealed plastic bags, pyrrhotite altered, whereas pentlandite chalcopyrite stable, presumably anaerobic reactions. detected trace amounts minute grains sediments, but their contents abruptly decreased with distance Microtextures such as troilite exsolution or twinning pyrrhotite, however, could be observed fine suggesting derivation material,
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ژورنال
عنوان ژورنال: Minerals
سال: 2021
ISSN: ['2075-163X']
DOI: https://doi.org/10.3390/min11111224