The Geology, Formation Conditions, and Ore Potential of the Turgoyak Granite Pluton and Carbonaceous Rocks of its Western Frame (Southern Urals)

摘要

The Early-Middle Carboniferous Turgoyak granite pluton and Middle Riphean Urenga and Upper Riphean Uitash formations are described. In the Late Vendian, both formations underwent regional metamorphism of the cummingtonite-amphibolite facies at 550-595 degrees C and 250-440 MPa and, locally, diaphthoresis at 520-530 degrees C and 130-170 MPa. During origination of the Turgoyak pluton at 770-810 degrees C and 210-250 MPa, the country rocks were subjected to contact metamorphism leading to the removal of gold from black shales of the amphibole-hornfel facies zone and its redeposition within the albite-epidote-hornfel facies zone.