XENOLITHS OF POLYMICTIC BRECCIAS FROM KIMBERLITES OF THE YAKUTIAN DIAMONDIFEROUS PROVINCE
The polymictic breccias, extremely rare mantle conglomerates being the fragments of rocks and large mantle minerals cemented with fine-grained mass have been long provoking interest of petrologists worldwide. This work provides a comparative analysis of two xenoliths of polymictic rocks from kimberl...
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| Format: | Article |
| Language: | English |
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Russian Academy of Sciences, Siberian Branch, Institute of the Earth's crust
2022-10-01
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| Series: | Геодинамика и тектонофизика |
| Subjects: | |
| Online Access: | https://www.gt-crust.ru/jour/article/view/1555 |
| _version_ | 1826557554496372736 |
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| author | L. N. Pokhilenko N. P. Pokhilenko V. P. Afanasiev |
| author_facet | L. N. Pokhilenko N. P. Pokhilenko V. P. Afanasiev |
| author_sort | L. N. Pokhilenko |
| collection | DOAJ |
| description | The polymictic breccias, extremely rare mantle conglomerates being the fragments of rocks and large mantle minerals cemented with fine-grained mass have been long provoking interest of petrologists worldwide. This work provides a comparative analysis of two xenoliths of polymictic rocks from kimberlite pipes of different age and productivity occurring in the Siberian craton. The similarity of the chemical composition of some minerals of polymictic breccias from kimberlites within different parts of the Siberian craton assumes possible formation of these minerals caused by the same factors in the prekimberlite period of these parts of the lithospheric mantle. A wide range of compositions and chaotic zoning of minerals, the presence of exsolution textures in orthopyroxene, ilmenite, sulfide, and kelyphite rims on garnet suggest that the fragments of the studied xenoliths are unbalanced. Sample SH18/20 is the first polymictic breccia showing asthenospheric melt-fluids sampling shallow depths of the spinel facies. |
| first_indexed | 2024-04-09T20:28:13Z |
| format | Article |
| id | doaj.art-f10e6fa882d445aeb8f4c16220049033 |
| institution | Directory Open Access Journal |
| issn | 2078-502X |
| language | English |
| last_indexed | 2025-03-14T08:30:27Z |
| publishDate | 2022-10-01 |
| publisher | Russian Academy of Sciences, Siberian Branch, Institute of the Earth's crust |
| record_format | Article |
| series | Геодинамика и тектонофизика |
| spelling | doaj.art-f10e6fa882d445aeb8f4c162200490332025-03-02T13:02:51ZengRussian Academy of Sciences, Siberian Branch, Institute of the Earth's crustГеодинамика и тектонофизика2078-502X2022-10-0113410.5800/GT-2022-13-4-0660660XENOLITHS OF POLYMICTIC BRECCIAS FROM KIMBERLITES OF THE YAKUTIAN DIAMONDIFEROUS PROVINCEL. N. Pokhilenko0N. P. Pokhilenko1V. P. Afanasiev2Sobolev Institute of Geology and Mineralogy, Siberian Branch of the Russian Academy of SciencesSobolev Institute of Geology and Mineralogy, Siberian Branch of the Russian Academy of Sciences; Novosibirsk State UniversitySobolev Institute of Geology and Mineralogy, Siberian Branch of the Russian Academy of SciencesThe polymictic breccias, extremely rare mantle conglomerates being the fragments of rocks and large mantle minerals cemented with fine-grained mass have been long provoking interest of petrologists worldwide. This work provides a comparative analysis of two xenoliths of polymictic rocks from kimberlite pipes of different age and productivity occurring in the Siberian craton. The similarity of the chemical composition of some minerals of polymictic breccias from kimberlites within different parts of the Siberian craton assumes possible formation of these minerals caused by the same factors in the prekimberlite period of these parts of the lithospheric mantle. A wide range of compositions and chaotic zoning of minerals, the presence of exsolution textures in orthopyroxene, ilmenite, sulfide, and kelyphite rims on garnet suggest that the fragments of the studied xenoliths are unbalanced. Sample SH18/20 is the first polymictic breccia showing asthenospheric melt-fluids sampling shallow depths of the spinel facies.https://www.gt-crust.ru/jour/article/view/1555polymictic brecciakimberlitexenolithupper mantlenoyabrskaya pipeudachnaya pipe |
| spellingShingle | L. N. Pokhilenko N. P. Pokhilenko V. P. Afanasiev XENOLITHS OF POLYMICTIC BRECCIAS FROM KIMBERLITES OF THE YAKUTIAN DIAMONDIFEROUS PROVINCE Геодинамика и тектонофизика polymictic breccia kimberlite xenolith upper mantle noyabrskaya pipe udachnaya pipe |
| title | XENOLITHS OF POLYMICTIC BRECCIAS FROM KIMBERLITES OF THE YAKUTIAN DIAMONDIFEROUS PROVINCE |
| title_full | XENOLITHS OF POLYMICTIC BRECCIAS FROM KIMBERLITES OF THE YAKUTIAN DIAMONDIFEROUS PROVINCE |
| title_fullStr | XENOLITHS OF POLYMICTIC BRECCIAS FROM KIMBERLITES OF THE YAKUTIAN DIAMONDIFEROUS PROVINCE |
| title_full_unstemmed | XENOLITHS OF POLYMICTIC BRECCIAS FROM KIMBERLITES OF THE YAKUTIAN DIAMONDIFEROUS PROVINCE |
| title_short | XENOLITHS OF POLYMICTIC BRECCIAS FROM KIMBERLITES OF THE YAKUTIAN DIAMONDIFEROUS PROVINCE |
| title_sort | xenoliths of polymictic breccias from kimberlites of the yakutian diamondiferous province |
| topic | polymictic breccia kimberlite xenolith upper mantle noyabrskaya pipe udachnaya pipe |
| url | https://www.gt-crust.ru/jour/article/view/1555 |
| work_keys_str_mv | AT lnpokhilenko xenolithsofpolymicticbrecciasfromkimberlitesoftheyakutiandiamondiferousprovince AT nppokhilenko xenolithsofpolymicticbrecciasfromkimberlitesoftheyakutiandiamondiferousprovince AT vpafanasiev xenolithsofpolymicticbrecciasfromkimberlitesoftheyakutiandiamondiferousprovince |