Mobility of rare-earth elements and copper during shear-zone-related retrograde metamorphism |
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| Authors: | de Jong Geoffrey Rotherham Jackie Phillips G Neil Williams Patrick J |
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| Institution: | (1) Pottenbakkersdonk 9, 7326 PA Apeldoorn, the Netherlands;(2) Great Central Mines N.L., Melbourne, Australia;(3) National Key Centre in Economic Geology, Geology Department, James Cook University of North Queensland, Townsville, Q 4811, Australia |
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| Abstract: | In Mid Proterozoic crystalline rocks of the Mount Isa Inlier, around Cloncurry, Australia, 2000 km2 of alteration and brecciation are the product of high-temperature (> 450 °C) concentrated saline solution activity. During retrogression, this fluid was locally responsible for mobility of V, Y, Nb and light rare-earth elements (15 × enrichment). Copper and S were leached during alteration and this may have been a significant source of components in nearby Cu-Au deposits. Similar rare-earth-element behaviour has been observed in the hematite breccias which host Cu-sulfides at the giant Olympic Dam Cu-Au deposit. |
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| Keywords: | Australia metadolerites Mt Isa Inlier REE mobility sodic-calcic alteration |
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