Zr-Th-U MINERALS IN HIGH-MG DIORITE OF THE CHELYABINSK MASSIF (SOUTH URALS) – EVIDENCE FOR CRUST–MANTLE INTERACTION
Zr-Th-U minerals, namely baddeleyite, zircon and U-Th-oxide, were found in high-Mg diorite from the Late Devonian – Early Carboniferous synplutonic dyke in granodiorites of the Chelyabinsk massif, South Urals. Micron-sized minerals were investigated by electron microscopy and cathodoluminescence spe...
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Russian Academy of Sciences, Siberian Branch, Institute of the Earth's crust
2021-06-01
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| Series: | Геодинамика и тектонофизика |
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| Online Access: | https://www.gt-crust.ru/jour/article/view/1215 |
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| author | T. A. Osipova G. A. Kallistov D. A. Zamyatin V. A. Bulatov |
| author_facet | T. A. Osipova G. A. Kallistov D. A. Zamyatin V. A. Bulatov |
| author_sort | T. A. Osipova |
| collection | DOAJ |
| description | Zr-Th-U minerals, namely baddeleyite, zircon and U-Th-oxide, were found in high-Mg diorite from the Late Devonian – Early Carboniferous synplutonic dyke in granodiorites of the Chelyabinsk massif, South Urals. Micron-sized minerals were investigated by electron microscopy and cathodoluminescence spectroscopy. Their chemical compositions were determined by electron probe microanalysis that was optimized to ensure more precise measurements of the composition of minerals. Baddeleyite grains are found as inclusions in amphibole crystals and reside in intergranular areas. The former retain their composition and show no traces of corrosion or substitution. In the intergranular areas, baddeleyite grains were replaced by polycrystalline zircon due to the reaction with an acid melt, and the U-Th-oxide precipitated inside baddeleyite simultaneously, which suggests the restite origin of baddeleyite. The main features of the baddeleyite composition are extremely high concentrations of ThO2 and UO2 (to 0.03 wt. % and 1.0 wt. %, respectively), which may be due to the metasomatic interaction between the mantle peridotite and the crustal or carbonatite fluid or melt. |
| format | Article |
| id | doaj-art-4aad854693bf4ed69704c5b3fc246e27 |
| institution | Kabale University |
| issn | 2078-502X |
| language | English |
| publishDate | 2021-06-01 |
| publisher | Russian Academy of Sciences, Siberian Branch, Institute of the Earth's crust |
| record_format | Article |
| series | Геодинамика и тектонофизика |
| spelling | doaj-art-4aad854693bf4ed69704c5b3fc246e272025-08-20T03:37:06ZengRussian Academy of Sciences, Siberian Branch, Institute of the Earth's crustГеодинамика и тектонофизика2078-502X2021-06-0112235036410.5800/GT-2021-12-2-0528529Zr-Th-U MINERALS IN HIGH-MG DIORITE OF THE CHELYABINSK MASSIF (SOUTH URALS) – EVIDENCE FOR CRUST–MANTLE INTERACTIONT. A. Osipova0G. A. Kallistov1D. A. Zamyatin2V. A. Bulatov3Zavaritsky Institute of Geology and Geochemistry, Ural Branch of the Russian Academy of SciencesZavaritsky Institute of Geology and Geochemistry, Ural Branch of the Russian Academy of SciencesZavaritsky Institute of Geology and Geochemistry, Ural Branch of the Russian Academy of SciencesZavaritsky Institute of Geology and Geochemistry, Ural Branch of the Russian Academy of SciencesZr-Th-U minerals, namely baddeleyite, zircon and U-Th-oxide, were found in high-Mg diorite from the Late Devonian – Early Carboniferous synplutonic dyke in granodiorites of the Chelyabinsk massif, South Urals. Micron-sized minerals were investigated by electron microscopy and cathodoluminescence spectroscopy. Their chemical compositions were determined by electron probe microanalysis that was optimized to ensure more precise measurements of the composition of minerals. Baddeleyite grains are found as inclusions in amphibole crystals and reside in intergranular areas. The former retain their composition and show no traces of corrosion or substitution. In the intergranular areas, baddeleyite grains were replaced by polycrystalline zircon due to the reaction with an acid melt, and the U-Th-oxide precipitated inside baddeleyite simultaneously, which suggests the restite origin of baddeleyite. The main features of the baddeleyite composition are extremely high concentrations of ThO2 and UO2 (to 0.03 wt. % and 1.0 wt. %, respectively), which may be due to the metasomatic interaction between the mantle peridotite and the crustal or carbonatite fluid or melt.https://www.gt-crust.ru/jour/article/view/1215high-mg dioritebaddeleyiteuranotorianitezirconpetrogenesiscrust–mantle interactionsouth uralscathodoluminescenceelectron probe microanalysis |
| spellingShingle | T. A. Osipova G. A. Kallistov D. A. Zamyatin V. A. Bulatov Zr-Th-U MINERALS IN HIGH-MG DIORITE OF THE CHELYABINSK MASSIF (SOUTH URALS) – EVIDENCE FOR CRUST–MANTLE INTERACTION Геодинамика и тектонофизика high-mg diorite baddeleyite uranotorianite zircon petrogenesis crust–mantle interaction south urals cathodoluminescence electron probe microanalysis |
| title | Zr-Th-U MINERALS IN HIGH-MG DIORITE OF THE CHELYABINSK MASSIF (SOUTH URALS) – EVIDENCE FOR CRUST–MANTLE INTERACTION |
| title_full | Zr-Th-U MINERALS IN HIGH-MG DIORITE OF THE CHELYABINSK MASSIF (SOUTH URALS) – EVIDENCE FOR CRUST–MANTLE INTERACTION |
| title_fullStr | Zr-Th-U MINERALS IN HIGH-MG DIORITE OF THE CHELYABINSK MASSIF (SOUTH URALS) – EVIDENCE FOR CRUST–MANTLE INTERACTION |
| title_full_unstemmed | Zr-Th-U MINERALS IN HIGH-MG DIORITE OF THE CHELYABINSK MASSIF (SOUTH URALS) – EVIDENCE FOR CRUST–MANTLE INTERACTION |
| title_short | Zr-Th-U MINERALS IN HIGH-MG DIORITE OF THE CHELYABINSK MASSIF (SOUTH URALS) – EVIDENCE FOR CRUST–MANTLE INTERACTION |
| title_sort | zr th u minerals in high mg diorite of the chelyabinsk massif south urals evidence for crust mantle interaction |
| topic | high-mg diorite baddeleyite uranotorianite zircon petrogenesis crust–mantle interaction south urals cathodoluminescence electron probe microanalysis |
| url | https://www.gt-crust.ru/jour/article/view/1215 |
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