The influence of rheologic crustal properties of the crust on the location of ore-forming hydrothermal magmatic systems |
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| Authors: | N S Zhatnuev S N Rychagov V I Vasil’ev E V Vasil’eva |
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| Institution: | 1. a Geological Institute, Siberian Branch, Russian Academy of Sciences, 6a ul. Sakh??yanovoi, Ulan-Ude, Russia, 670047
2. Institute of Volcanology and Seismology, Far East Branch, Russian Academy of Sciences, Petropavlovsk-Kamchatskii, Russia, 683006
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| Abstract: | Based on a comprehensive study of hydrothermal magmatic systems at island arcs and a review of available mechanisms that cause elasto-plastic deformation in rocks, we considered the conditions for interaction between a convective magmatic cell and a convective hydrothermal cell in different rheologic zones of the crust. Three models have been developed to describe the generation of hydrothermal circulation systems: (1) the magma chamber is localized in a plastic zone, (2) partial and (3) complete penetration of the chamber into a brittle crust. It is shown that the last of these models is highly consistent with the structure of presentday high-temperature hydrothermal magmatic systems at depths greater than 1.0?C1.5 km and with the structure of Miocene to Pliocene ore-bearing volcano-plutonic complexes that are eroded to different depths in different geologic blocks within these complexes. |
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