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- W2028638309 abstract "The effects of regional metamorphism on mineral deposits, the massive ores in particular, have been the subject of renewed research in the last 25 years. Documentation of movement of ore materials and identification of the mechanisms of transport have proven easier for deposits metamorphosed at low and intermediate grades than for those metamorphosed at high grades. This paper focusses mainly on evidence for mobilization at high grades of metamorphism; genetic conclusions regarding the mechanisms of transport are offered somewhat more tentatively. Synmetamorphic brecciation, a consistent relationship of metal ratios to position in folds in deformed ores, and the occurrence of mineralization in tension gash veins and pressure shadows, indicate that ore materials can be redistributed within ore-masses. Mechanisms which may explain these observations are brittle behaviour in response to stress, ductile flow of sulfide minerals and pressure solution. Movement of material into or out of ore-masses is indicated by the gradients in fO2 and fS2 between ore and country rock which have been documented at a number of localities. Uranium can also be mobilized and transported over significant distances during high-grade metamorphism. The supporting evidence is, however, indirect in that high-grade rocks are consistently depleted in U relative to similar rocks metamorphosed to lower grades. The development and migration of a sulfide melt during metamorphism is a possible mechanism for moving materials into or out of ore-masses; however, there is no good evidence that this process occurs in nature. Finally, some ore-masses may have been displaced physically during high-grade metamorphism. There is some suggestion that massive sulfide and oxide ores in high-grade terranes occur preferentially in synformal structures. If this is the case, it may be due to a sinking process initiated by the large density contrast between massive ores and country rocks. A simple dynamic model for the Sterling Hill deposit, New Jersey is consistent with this hypothesis and gives a sinking rate of 102–104 cm Ma−." @default.
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- W2028638309 date "1987-05-01" @default.
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- W2028638309 title "Evidence for movement of ore materials during high-grade metamorphism" @default.
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- W2028638309 doi "https://doi.org/10.1016/0169-1368(87)90028-x" @default.
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