The Overmaraat-Gol alkaline pluton in Northern Mongolia: U-Pb age and preliminary implications for magma sources and tectonic setting
| Autor: | Andrey E. Izokh, Richard E. Ernst, Andrey V. Vishnevskii, I. F. Gertner, V. V. Vrublevskii |
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| Jazyk: | angličtina |
| Rok vydání: | 2019 |
| Předmět: |
lcsh:QE351-399.2
010504 meteorology & atmospheric sciences Pluton Geochemistry geology Northern Mongolia изотопная геохронология plume–lithosphere interaction 010502 geochemistry & geophysics 01 natural sciences Mantle plume Mantle (geology) Central Asian Orogenic Belt Continental margin щелочной магматизм плюмовый магматизм 0105 earth and related environmental sciences geochemistry U–Pb isotope geochronology геохимия lcsh:Mineralogy biology alkaline magmatism geology.rock_type Geology Geotechnical Engineering and Engineering Geology biology.organism_classification Северная Монголия Magmatism Nepheline syenite Lile Zircon |
| Zdroj: | Minerals. 2019. Vol. 9, № 3. P. 170 (1-13) Minerals Volume 9 Issue 3 Minerals, Vol 9, Iss 3, p 170 (2019) |
| Popis: | A new Wenlockian zircon U&ndash Pb age (~426 Ma) of the Overmaraat-Gol nepheline syenite (foyaite, juvite) pluton in the SW Lake Hovsgol area (Northern Mongolia) prompts a long history of alkaline magmatism in the western Central Asian Orogenic Belt, exceeding the duration of the Devonian and Permian&ndash Triassic events. The LILE and HFSE patterns of pluton samples analyzed by X-ray fluorescence (XRF) and inductively coupled plasma (ICP-MS) methods indicate intrusion in a complex tectonic setting during interaction of a mantle plume with accretionary-collisional complexes that previously formed on the active continental margin. As a result, the parent magma had a heterogeneous source with mixed mantle (PREMA and EM) and crustal components. This source composition is consistent with Nd&ndash Sr isotope ratios of the Overmaraat-Gol alkaline rocks, from &minus 0.1 to &minus 1.2 &epsilon Nd(t) and from ~0.706 to 0.707 87Sr/86Sr(t). |
| Databáze: | OpenAIRE |
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