The Dynamics of Transformation of Lithospheric Mantle Rocks Beneath the Siberian Craton
The problem of heat–mass transfer in the permeable areas above the asthenosphere zones was numerically studied based on an examination of the inclusion content in the minerals (olivine and clinopyroxenes) of igneous and metamorphic rocks of the lithospheric mantle and the Earth’s crust; evaluations...
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| Format: | Article |
| Language: | English |
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MDPI AG
2023-03-01
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| Series: | Minerals |
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| Online Access: | https://www.mdpi.com/2075-163X/13/3/423 |
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| author | Yury Perepechko Victor Sharapov Anatoly Tomilenko Konstantin Chudnenko Konstantin Sorokin Igor Ashchepkov |
| author_facet | Yury Perepechko Victor Sharapov Anatoly Tomilenko Konstantin Chudnenko Konstantin Sorokin Igor Ashchepkov |
| author_sort | Yury Perepechko |
| collection | DOAJ |
| description | The problem of heat–mass transfer in the permeable areas above the asthenosphere zones was numerically studied based on an examination of the inclusion content in the minerals (olivine and clinopyroxenes) of igneous and metamorphic rocks of the lithospheric mantle and the Earth’s crust; evaluations of thermodynamic conditions of the inclusion formation; and experimental modeling of the influence of hot reduced gases on rocks in the mantle beneath the Siberian craton. The flow of fluids of a certain composition from the upper-mantle magma chambers leads to the formation of zonal metasomatic columns in the ultrabasic mantle lithosphere in the permeable zones of deep faults (starting from the lithosphere base at 6–7 GPa). When petrogenic components enter from the magma pocket, depleted ultrabasic lithospheric mantle rocks change to substrates, which can be considered as the deep counterparts of crustal rodingites. Other fluid compositions result in strong calcination and pronounced salinization of the metasomatized substrates or an increase in the garnet content of the primary ultrabasic matrix. A region of alkaline rocks forms above these areas, which changes to pyroxenes, amphiboles, and biotites. The heat–mass transfer modeling for the two-velocity hydrodynamic model shows that gas–fluid and melt percolation lead to an increase in the thermal front velocity under convective heating and a pressure drop in flow. It is also shown that grospidites are considered to be eclogites, are found in the permeable zones of the lithospheric mantle columns serving as conduits for the melt/fluids and represent the products of the carbonated metasomatic columns. The carbonization caused by proto-kimberlite melts may essentially decrease the diamond grade of kimberlites due to carbon oxidation. |
| first_indexed | 2024-03-11T06:08:01Z |
| format | Article |
| id | doaj.art-16431dcd6e0844a89925a4d30e2b3567 |
| institution | Directory Open Access Journal |
| issn | 2075-163X |
| language | English |
| last_indexed | 2024-03-11T06:08:01Z |
| publishDate | 2023-03-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Minerals |
| spelling | doaj.art-16431dcd6e0844a89925a4d30e2b35672023-11-17T12:48:23ZengMDPI AGMinerals2075-163X2023-03-0113342310.3390/min13030423The Dynamics of Transformation of Lithospheric Mantle Rocks Beneath the Siberian CratonYury Perepechko0Victor Sharapov1Anatoly Tomilenko2Konstantin Chudnenko3Konstantin Sorokin4Igor Ashchepkov5Sobolev Institute of Geology and Mineralogy, Siberian Branch of the Russian Academy of Sciences, 630090 Novosibirsk, RussiaSobolev Institute of Geology and Mineralogy, Siberian Branch of the Russian Academy of Sciences, 630090 Novosibirsk, RussiaSobolev Institute of Geology and Mineralogy, Siberian Branch of the Russian Academy of Sciences, 630090 Novosibirsk, RussiaVernadsky Institute of Geochemistry, Siberian Branch of the Russian Academy of Sciences, 664033 Irkutsk, RussiaSobolev Institute of Geology and Mineralogy, Siberian Branch of the Russian Academy of Sciences, 630090 Novosibirsk, RussiaSobolev Institute of Geology and Mineralogy, Siberian Branch of the Russian Academy of Sciences, 630090 Novosibirsk, RussiaThe problem of heat–mass transfer in the permeable areas above the asthenosphere zones was numerically studied based on an examination of the inclusion content in the minerals (olivine and clinopyroxenes) of igneous and metamorphic rocks of the lithospheric mantle and the Earth’s crust; evaluations of thermodynamic conditions of the inclusion formation; and experimental modeling of the influence of hot reduced gases on rocks in the mantle beneath the Siberian craton. The flow of fluids of a certain composition from the upper-mantle magma chambers leads to the formation of zonal metasomatic columns in the ultrabasic mantle lithosphere in the permeable zones of deep faults (starting from the lithosphere base at 6–7 GPa). When petrogenic components enter from the magma pocket, depleted ultrabasic lithospheric mantle rocks change to substrates, which can be considered as the deep counterparts of crustal rodingites. Other fluid compositions result in strong calcination and pronounced salinization of the metasomatized substrates or an increase in the garnet content of the primary ultrabasic matrix. A region of alkaline rocks forms above these areas, which changes to pyroxenes, amphiboles, and biotites. The heat–mass transfer modeling for the two-velocity hydrodynamic model shows that gas–fluid and melt percolation lead to an increase in the thermal front velocity under convective heating and a pressure drop in flow. It is also shown that grospidites are considered to be eclogites, are found in the permeable zones of the lithospheric mantle columns serving as conduits for the melt/fluids and represent the products of the carbonated metasomatic columns. The carbonization caused by proto-kimberlite melts may essentially decrease the diamond grade of kimberlites due to carbon oxidation.https://www.mdpi.com/2075-163X/13/3/423Siberian cratonpetrologymorphotectonicsheat–mass transfermathematical modeling |
| spellingShingle | Yury Perepechko Victor Sharapov Anatoly Tomilenko Konstantin Chudnenko Konstantin Sorokin Igor Ashchepkov The Dynamics of Transformation of Lithospheric Mantle Rocks Beneath the Siberian Craton Minerals Siberian craton petrology morphotectonics heat–mass transfer mathematical modeling |
| title | The Dynamics of Transformation of Lithospheric Mantle Rocks Beneath the Siberian Craton |
| title_full | The Dynamics of Transformation of Lithospheric Mantle Rocks Beneath the Siberian Craton |
| title_fullStr | The Dynamics of Transformation of Lithospheric Mantle Rocks Beneath the Siberian Craton |
| title_full_unstemmed | The Dynamics of Transformation of Lithospheric Mantle Rocks Beneath the Siberian Craton |
| title_short | The Dynamics of Transformation of Lithospheric Mantle Rocks Beneath the Siberian Craton |
| title_sort | dynamics of transformation of lithospheric mantle rocks beneath the siberian craton |
| topic | Siberian craton petrology morphotectonics heat–mass transfer mathematical modeling |
| url | https://www.mdpi.com/2075-163X/13/3/423 |
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