| Инд. авторы: | Izokh A.E., Vishnevskii A.V, Polyakov G.V., Kalugin V.M., Oyunchimeg T., Shelepaev R.A., Egorova V.V. |
| Заглавие: | The Ureg Nuur Pt-bearing volcanoplutonic picrite-basalt association in the Mongolian Altay as evidence for a Cambrian-Ordovician Large Igneous Province |
| Библ. ссылка: | Izokh A.E., Vishnevskii A.V, Polyakov G.V., Kalugin V.M., Oyunchimeg T., Shelepaev R.A., Egorova V.V. The Ureg Nuur Pt-bearing volcanoplutonic picrite-basalt association in the Mongolian Altay as evidence for a Cambrian-Ordovician Large Igneous Province // Russian Geology and Geophysics. - 2010. - Vol.51. - Iss. 5. - P.521-533. - ISSN 1068-7971. - EISSN 1878-030X. |
| Внешние системы: | DOI: 10.1016/j.rgg.2010.04.003; SCOPUS: 2-s2.0-77951213793; |
| Реферат: | eng: The paper discusses geological, mineralogical, petrographic, and geochemical data on the Ureg Nuur volcanoplutonic association of high-Mg volcanic and subvolcanic rocks located among Vendian-Cambrian accretionary structures in the Mongolian Altay. These rocks have a high potassium alkalinity (K2O/Na2O up to 1.2), are enriched in LILE and Sr, and have negative Zr-Hf and Nb anomalies in multielement spectra; this confirms the suprasubduction type of the source of melts. The geological setting and established age (512.4 ± 6.1 Ma, 39Ar-40Ar dating of biotite phenocrysts) evidence picritic magmatism at the accretionary stage of the development of the Altay fragment of the Paleoasian ocean. This indicates a large igneous province related to a mantle plume. © 2010.
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| Ключевые слова: | geochemistry; large igneous provinces; picrite; plume; Ural-Alaskan-type Pt-bearing intrusions; western Mongolia; Mongolia; subduction; picrite; petrography; Ordovician; mantle plume; magmatism; large igneous province; igneous intrusion; geochemistry; Cambrian; basalt; basalt; accretion; |
| Издано: | 2010 |
| Физ. характеристика: | с.521-533 |