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flood basalt |
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The geologic history of southwestern Idaho resembles that of eastern Washington with its flood basalts, northwest-trending structures, extensive loess blankets, and glacial outburst floods (Meinert and Busacca, 2000, 2002). Closer to the surface, the impacts may trigger the largest lava outpourings - known as flood basalt provinces - which form vast plateaus on land and under the sea. Like the famous Noril'sk mining camp in Russia, Canwell has numerous mineral occurrences with high grades of nickel, copper and PGE relative to the total amount of sulfide; it has sulfur-rich country rocks; it represents a regional magmatic centre; and it is comagmatic with a major Triassic flood basalt sequence characterized by extreme nickel and PGE depletion. |
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