MANTLE PLUMES AND THEIR GEOLOGIC MANIFESTATIONS
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dc.contributor.author | Dobretsov N.L. | |
dc.contributor.author | Vernikovsky V.A. | |
dc.date.accessioned | 2021-02-20T08:12:58Z | |
dc.date.available | 2021-02-20T08:12:58Z | |
dc.date.issued | 2001 | |
dc.identifier | https://elibrary.ru/item.asp?id=13376285 | |
dc.identifier.citation | International Geology Review, 2001, 43, 9, 771-787 | |
dc.identifier.issn | 0020-6814 | |
dc.identifier.uri | https://repository.geologyscience.ru/handle/123456789/25285 | |
dc.description.abstract | This paper interprets the conditions of plume formation with a focus on interpretations of origin at the core-mantle boundary. We also discuss important geological manifestations including formation of alkaline-basalt oceanic islands, kimberlite pipes, and plateau-basalt fields. The paper concentrates on the Siberian traps that formed between 249 and 245 Ma, one of the world's largest known plateau-basalt fields, and on the magmatic zonation and ore mineralization associated with the field and that are interpreted as forming from a Siberian mantle plume. One part of the field consists of undifferentiated low-K tholeiite basalts in the Tunguska syncline and contains only minor associated ore deposits. Major, unique Cu-Ni and PGE deposits are associated with differentiated alkaline basalt and with mafic-ultramafie intrusions in the northwestern Siberian platform. Angara-Ilim-type magnetite deposits occur in the southern part of the plateau-basalt province and are related to interaction of mafic magmas with overlying carbonate and evaporite sedimentary rocks. Permian and Triassic alkaline granitoid and bimodal magmatic rocks occur in fold-and-thrust belts that frame the southern, southwestern, and northwestern margins of the main trap area. The paper also presents new geochemical and geochronological data for A-granites for the Taymyr region that are synchronous with traps. For both the southern and northern framing areas, porphyry Cu deposits interpreted as derived from a mantle-crust system are associated with subalkaline and alkaline granitoids. | |
dc.subject | Triassic | en |
dc.subject | Permian | en |
dc.title | MANTLE PLUMES AND THEIR GEOLOGIC MANIFESTATIONS | |
dc.type | Статья | |
dc.subject.age | Mesozoic::Triassic | en |
dc.subject.age | Мезозой::Триасовая | ru |
dc.subject.age | Палеозой::Пермская | ru |
dc.subject.age | Paleozoic::Permian | en |
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