Paleozoic tholeiitic magmatism of the Kola province: Spatial distribution, age, and relation to alkaline magmatism
- Autores: Arzamastsev A.1,2, Vesolovskiy R.3,4, Travin A.5,6, Yudin D.5,7, Belyatsky B.8
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Afiliações:
- Institute of Precambrian Geology and Geochronology
- Institute of Geosciences
- Faculty of Geology
- Shmidt Institute of the Physics of the Earth
- Sobolev Institute of Geology and Mineralogy, Siberian Branch
- Tomsk State University
- Novosibirsk State University
- Karpinskii All-Russia Research Institute of Geology
- Edição: Volume 25, Nº 1 (2017)
- Páginas: 42-65
- Seção: Article
- URL: https://journals.rcsi.science/0869-5911/article/view/177494
- DOI: https://doi.org/10.1134/S0869591116060023
- ID: 177494
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Resumo
This paper focuses on the occurrences of tholeiitic magmatism in the northeastern Fennoscandian shield. It was found that numerous dolerite dikes of the Pechenga, Barents Sea, and Eastern Kola swarms were formed 380–390 Ma ago, i.e., directly before the main stage of the Paleozoic alkaline magmatism of the Kola province. The isotope geochemical characteristics of the dolerites suggest that their primary melts were derived from the mantle under the conditions of the spinel lherzolite facies. The depleted mantle material from which the tholeiites were derived shows no evidence for metasomatism and enrichment in high fieldstrength and rare earth elements, whereas melanephelinite melts postdating the tholeiites were generated in an enriched source. It was shown that the relatively short stage of mantle metasomatism directly after the emplacement of tholeiitic magmas was accompanied by significant mantle fertilization. In contrast to other large igneous provinces, where pulsed intrusion of large volumes of tholeiitic magmas coinciding or alternating with phases of alkaline magmatism was documented, the Kola province is characterized by systematic evolution of the Paleozoic plume–lithosphere process with monotonous deepening of the level of magma generation, development of mantle metasomatism and accompanying fertilization of mantle materials, and systematic changes in the composition of melts reaching the surface.
Sobre autores
A. Arzamastsev
Institute of Precambrian Geology and Geochronology; Institute of Geosciences
Autor responsável pela correspondência
Email: arzamas@ipgg.ru
Rússia, nab. Makarova 2, St. Petersburg, 199034; Universitetskaya nab. 7/9, St. Petersburg, 199034
R. Vesolovskiy
Faculty of Geology; Shmidt Institute of the Physics of the Earth
Email: arzamas@ipgg.ru
Rússia, Moscow, 119991; Bol’shaya Gruzinskaya ul. 10 (1), Moscow, 123242
A. Travin
Sobolev Institute of Geology and Mineralogy, Siberian Branch; Tomsk State University
Email: arzamas@ipgg.ru
Rússia, pr. Akademika Koptyuga 3, Novosibirsk, 630090; pr. Lenina 36, Tomsk, 634050
D. Yudin
Sobolev Institute of Geology and Mineralogy, Siberian Branch; Novosibirsk State University
Email: arzamas@ipgg.ru
Rússia, pr. Akademika Koptyuga 3, Novosibirsk, 630090; ul. Pirogova 2, Novosibirsk, 630090
B. Belyatsky
Karpinskii All-Russia Research Institute of Geology
Email: arzamas@ipgg.ru
Rússia, Srednii pr. 74, St. Petersburg, 199106