Syngenetic sulphide minerals in a copper-rich bog |
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| Authors: | R E W Lett W K Fletcher |
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| Institution: | (1) Department of Geological Sciences, University of British Columbia, Vancouver, B. C., Canada;(2) Barringer Research Ltd., Toronto, Ontario, Canada |
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| Abstract: | Heavy mineral separates of peat from a mineralotrophic bog contain sulphide minerals with distinctive textures. Pyrite framboids, consisting of spherical aggregates of subhedral pyrite crystals, are surrounded by a thin rim of chalcopyrite or a layer of massive marcasite. Clusters of framboids are cemented by covellite which also occurs as small idiomorphic grains, with rectangular or hexagonal outlines, surrounded by chalcopyrite. The sulphides appear to have resulted from discharge of groundwaters, enriched in copper from weathering of primary sulphides in bedrock and in iron by reduction of the till underlying the peat, into the hydrogen sulphide charged bog. |
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