PARTIAL MELTING AND ASSIMILATION OF DOLOMITIC XENOLITHS BY MAFIC MAGMA: THE IOKO-DOVYREN INTRUSION (NORTH BAIKAL REGION, RUSSIA)
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dc.contributor.author | Wenzel T. | |
dc.contributor.author | Baumgartner L.P. | |
dc.contributor.author | Brügmann G.E. | |
dc.contributor.author | Konnikov E.G. | |
dc.contributor.author | Kislov E.V. | |
dc.date.accessioned | 2021-05-22T12:11:19Z | |
dc.date.available | 2021-05-22T12:11:19Z | |
dc.date.issued | 2002 | |
dc.identifier | https://www.elibrary.ru/item.asp?id=13402218 | |
dc.identifier.citation | Journal of Petrology, 2002, 43, 11, 2049 | |
dc.identifier.issn | 0022-3530 | |
dc.identifier.uri | https://repository.geologyscience.ru/handle/123456789/28573 | |
dc.description.abstract | A petrological study was carried out on Mg-skarn-bearing dunite cumulates that are part of the Neo-Proterozoic Ioko-Dovyren intrusion (North Baikal region, Russia). Skarn xenoliths contain brucite pseudomorphs after periclase, forsterite and Cr-poor spinel. Fine-grained forsterite-spinel skarns occur with the brucite skarns or as isolated schlieren. Field relationships reveal that the Mg-skarns formed from silica-poor dolomitic xenoliths by interaction with the mafic magma of the Ioko-Dovyren intrusion. Rapid heating of dolomitic xenoliths by the mafic magma caused the decomposition of dolomite into calcite + periclase, releasing much CO2. Further heating quantitatively melted the calcite. A periclase-rich restite was left behind after extraction of the low-density, low-viscosity calcite melt. The extracted calcite melt mixed with the surrounding mafic melt. This resulted in crystallization of olivine with CaO contents up to 1.67 wt %. A local decrease in the silica concentration stabilized CaAl2SiO6-rich clinopyroxene. Brucite/periclase-free forsterite-spinel skarns probably originated by crystallization from the mafic melt close to the xenoliths at elevated fO(2). The high fO(2) was caused by CO2-rich fluids released during the decomposition of the xenoliths. The above case study provides the first evidence for partial melting of dolomite xenoliths during incorporation by a mafic magma. | |
dc.subject | dunite | |
dc.subject | dolomite assimilation | |
dc.subject | partial melting | |
dc.title | PARTIAL MELTING AND ASSIMILATION OF DOLOMITIC XENOLITHS BY MAFIC MAGMA: THE IOKO-DOVYREN INTRUSION (NORTH BAIKAL REGION, RUSSIA) | |
dc.type | Статья |
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