Murzinka massive at the middle urals as an example of the interformational granite pluton: magmatic sources, geochemical zonality, peculiarities of formation
Murzinka massif is a sheet-like interformational body steeply deeping to the East with length about 6 km. Proterozoic metamorphic rocks of the predominantly granulite facies ( P = 5-6 kbar, T = 750-800°C) occur at the base of massif, and volcanic-sedimentary Silurian-Devonian rocks metamorphosed in...
| Main Authors: | , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
A.N. Zavaritsky Institute of Geology and Geochemistry
2018-10-01
|
| Series: | Литосфера |
| Subjects: | |
| Online Access: | https://www.lithosphere.ru/jour/article/view/247 |
| _version_ | 1831680388073783296 |
|---|---|
| author | German B. Fershtater Nadezhda S. Borodina |
| author_facet | German B. Fershtater Nadezhda S. Borodina |
| author_sort | German B. Fershtater |
| collection | DOAJ |
| description | Murzinka massif is a sheet-like interformational body steeply deeping to the East with length about 6 km. Proterozoic metamorphic rocks of the predominantly granulite facies ( P = 5-6 kbar, T = 750-800°C) occur at the base of massif, and volcanic-sedimentary Silurian-Devonian rocks metamorphosed in the epidote-amphibolite facies - in the roof of it. Analyzes of rocks are made in the Institute of Geology and Geochemistry. A.N. Zavaritsky (Ekaterinburg, Russia) by standard methods. Petrogen elements were determined on the X-ray fluorescence spectrometers CPM-18, CPM-25, VRA-30 and the rare elements - on the ICP-MS mass spectrometer ELAN-9000 company Perkin Elmer. In the eastern direction the rocks lying in the base of the massif change their composition from predominantly basic to granitic. The gneisses of granitoid composition underwent a high degree of melting, and theirs anatectic melt formed the western part of Murzinka massif. The granites form three complexes: yuzhakovsk - vein of biotite orthoclase antiperthite granites, varying in K2O content, in the metamorphic rocks of the base of the massif, the vatikha - biotite orthoclase antiperthite granites in western part of the murzinka massif, and the murzinka s.s. - two-mica predominantly microcline granites in the eastern part of the massif. Vatikha and murzinka granites have the same isotopic age (about 255 Ma). A clear geochemical zonation is revealed in the massif: from the west to the east (from the base to the roof), the contents of Rb, Li, Nb, Ta grow in the granites of the vatikha and murzinka complexes. In the same direction, the ratios K/Rb, Zr/Hf, Nb/Ta decrease, as well as the content of Ba and Sr. Accordingly, the compositions of such rock-forming minerals as plagioclase and biotite also change. The isotope characteristics of the granites of the vatikha (Sri = 0.70868-0.70923 and εNd255 from -8.9 to -11.9) and murzinka (Sri = 0.70419-0.70549, εNd255 from -2.6 to +2.3) complexes suggest that the substratum of the former was the Proterozoic granite-gneisses, and of the second - the rocks of the newly formed crust, possibly similar to the Silurian-Devonian volcanogenic-sedimentary rocks, which contact with the murzinka granites at the west. |
| first_indexed | 2024-12-20T05:37:35Z |
| format | Article |
| id | doaj.art-810aa5db3ac54f47967f7ee130a06670 |
| institution | Directory Open Access Journal |
| issn | 1681-9004 2500-302X |
| language | English |
| last_indexed | 2024-12-20T05:37:35Z |
| publishDate | 2018-10-01 |
| publisher | A.N. Zavaritsky Institute of Geology and Geochemistry |
| record_format | Article |
| series | Литосфера |
| spelling | doaj.art-810aa5db3ac54f47967f7ee130a066702022-12-21T19:51:34ZengA.N. Zavaritsky Institute of Geology and GeochemistryЛитосфера1681-90042500-302X2018-10-010567269110.24930/1681-9004-2018-18-5-672-691247Murzinka massive at the middle urals as an example of the interformational granite pluton: magmatic sources, geochemical zonality, peculiarities of formationGerman B. Fershtater0Nadezhda S. Borodina1A.N. Zavaritsky Institute of Geology and Geochemistry, Urals Branch of RASA.N. Zavaritsky Institute of Geology and Geochemistry, Urals Branch of RASMurzinka massif is a sheet-like interformational body steeply deeping to the East with length about 6 km. Proterozoic metamorphic rocks of the predominantly granulite facies ( P = 5-6 kbar, T = 750-800°C) occur at the base of massif, and volcanic-sedimentary Silurian-Devonian rocks metamorphosed in the epidote-amphibolite facies - in the roof of it. Analyzes of rocks are made in the Institute of Geology and Geochemistry. A.N. Zavaritsky (Ekaterinburg, Russia) by standard methods. Petrogen elements were determined on the X-ray fluorescence spectrometers CPM-18, CPM-25, VRA-30 and the rare elements - on the ICP-MS mass spectrometer ELAN-9000 company Perkin Elmer. In the eastern direction the rocks lying in the base of the massif change their composition from predominantly basic to granitic. The gneisses of granitoid composition underwent a high degree of melting, and theirs anatectic melt formed the western part of Murzinka massif. The granites form three complexes: yuzhakovsk - vein of biotite orthoclase antiperthite granites, varying in K2O content, in the metamorphic rocks of the base of the massif, the vatikha - biotite orthoclase antiperthite granites in western part of the murzinka massif, and the murzinka s.s. - two-mica predominantly microcline granites in the eastern part of the massif. Vatikha and murzinka granites have the same isotopic age (about 255 Ma). A clear geochemical zonation is revealed in the massif: from the west to the east (from the base to the roof), the contents of Rb, Li, Nb, Ta grow in the granites of the vatikha and murzinka complexes. In the same direction, the ratios K/Rb, Zr/Hf, Nb/Ta decrease, as well as the content of Ba and Sr. Accordingly, the compositions of such rock-forming minerals as plagioclase and biotite also change. The isotope characteristics of the granites of the vatikha (Sri = 0.70868-0.70923 and εNd255 from -8.9 to -11.9) and murzinka (Sri = 0.70419-0.70549, εNd255 from -2.6 to +2.3) complexes suggest that the substratum of the former was the Proterozoic granite-gneisses, and of the second - the rocks of the newly formed crust, possibly similar to the Silurian-Devonian volcanogenic-sedimentary rocks, which contact with the murzinka granites at the west.https://www.lithosphere.ru/jour/article/view/247гранитыметаморфитыгеохимическая зональностьизотопные характеристики гранитовp-t параметры гранитного магматизмаgranitesgeochemical zonationisotopic characteristic of granitesp-t parameters of granite magmatism |
| spellingShingle | German B. Fershtater Nadezhda S. Borodina Murzinka massive at the middle urals as an example of the interformational granite pluton: magmatic sources, geochemical zonality, peculiarities of formation Литосфера граниты метаморфиты геохимическая зональность изотопные характеристики гранитов p-t параметры гранитного магматизма granites geochemical zonation isotopic characteristic of granites p-t parameters of granite magmatism |
| title | Murzinka massive at the middle urals as an example of the interformational granite pluton: magmatic sources, geochemical zonality, peculiarities of formation |
| title_full | Murzinka massive at the middle urals as an example of the interformational granite pluton: magmatic sources, geochemical zonality, peculiarities of formation |
| title_fullStr | Murzinka massive at the middle urals as an example of the interformational granite pluton: magmatic sources, geochemical zonality, peculiarities of formation |
| title_full_unstemmed | Murzinka massive at the middle urals as an example of the interformational granite pluton: magmatic sources, geochemical zonality, peculiarities of formation |
| title_short | Murzinka massive at the middle urals as an example of the interformational granite pluton: magmatic sources, geochemical zonality, peculiarities of formation |
| title_sort | murzinka massive at the middle urals as an example of the interformational granite pluton magmatic sources geochemical zonality peculiarities of formation |
| topic | граниты метаморфиты геохимическая зональность изотопные характеристики гранитов p-t параметры гранитного магматизма granites geochemical zonation isotopic characteristic of granites p-t parameters of granite magmatism |
| url | https://www.lithosphere.ru/jour/article/view/247 |
| work_keys_str_mv | AT germanbfershtater murzinkamassiveatthemiddleuralsasanexampleoftheinterformationalgraniteplutonmagmaticsourcesgeochemicalzonalitypeculiaritiesofformation AT nadezhdasborodina murzinkamassiveatthemiddleuralsasanexampleoftheinterformationalgraniteplutonmagmaticsourcesgeochemicalzonalitypeculiaritiesofformation |