The Role of the Pyroxenite Mantle in the Magma Genesis of the Oligocene Basalts from the Northern Part of East Sikhote Alin.
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| Title: | The Role of the Pyroxenite Mantle in the Magma Genesis of the Oligocene Basalts from the Northern Part of East Sikhote Alin. |
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| Authors: | Martynov, A. Yu.1 (AUTHOR) martvnov@fegi.ru, Martynov, Yu. A.1 (AUTHOR), Malinovskii, A. I.1 (AUTHOR) |
| Source: | Russian Journal of Pacific Geology. 2020, Vol. 14 Issue 6, p557-570. 14p. |
| Subject Terms: | *Pyroxenite, *Basalt, *Transition metals, *Amphiboles |
| Geographic Terms: | East Asia |
| Abstract: | Identification of magma sources and their role in the origination of basaltic magmas still remains one of the fundamental petrological problems. Based on new comprehensive isotope–geochemical and mineralogical data, the contribution of a pyroxenite mantle source was recognized for the first time for Oligocene basalts in the northern part of the East Sikhote Alin volcanic belt. The most important indicators of this source are significant variations in the first-row transition elements ratios (Zn/Fe = 11–17 and Zn/Mn = 6–10), Cr/Ni (1.8–6) and the Ni concentration (2000–3600 ppm) in olivine. The behavior of LIL elements suggests the presence of amphibole in a pyroxenite protolith. The obtained data can be used for the correct reconstruction of the magma generation and geodynamic environment in this territory in the Late Cenozoic. [ABSTRACT FROM AUTHOR] |
| Database: | Energy & Power Source |
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| Abstract: | Identification of magma sources and their role in the origination of basaltic magmas still remains one of the fundamental petrological problems. Based on new comprehensive isotope–geochemical and mineralogical data, the contribution of a pyroxenite mantle source was recognized for the first time for Oligocene basalts in the northern part of the East Sikhote Alin volcanic belt. The most important indicators of this source are significant variations in the first-row transition elements ratios (Zn/Fe = 11–17 and Zn/Mn = 6–10), Cr/Ni (1.8–6) and the Ni concentration (2000–3600 ppm) in olivine. The behavior of LIL elements suggests the presence of amphibole in a pyroxenite protolith. The obtained data can be used for the correct reconstruction of the magma generation and geodynamic environment in this territory in the Late Cenozoic. [ABSTRACT FROM AUTHOR] |
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| ISSN: | 18197140 |
| DOI: | 10.1134/S1819714020060056 |
