Chemical composition of melts of the Early Eocene volcanic center at Cape Khairyuzova, western Kamchatka: Evidence from inclusions in minerals
- Autores: Kovalenko D.1, Naumov V.2, Prokofiev V.1, Ageeva O.1, Andreeva O.1, Kovaltchuk E.1, Erofeeva K.1, Ugryumova N.1
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Afiliações:
- Institute of the Geology of Ore Deposits, Petrography, Mineralogy, and Geochemistry (IGEM)
- Vernadsky Institute of Geochemistry and Analytical Chemistry (GEOKhI)
- Edição: Volume 25, Nº 1 (2017)
- Páginas: 66-86
- Seção: Article
- URL: https://journals.rcsi.science/0869-5911/article/view/177496
- DOI: https://doi.org/10.1134/S0869591117010052
- ID: 177496
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Resumo
Original authors’ data on the mineralogy and composition of melt inclusions in two samples show that the Early Eocene magmatic rocks at Cape Khairyuzova were formed by mixing melts of mafic, intermediate, and acid composition, which were derived from different sources. The mafic melt was rich in MgO, and its temperature was 1100–1150°C. The temperature of the acid melt varied from 1070 to 1130°C. The melts are also different in concentrations of trace elements and in their ratios. All three melt types are enriched in LILE and LREE and depleted in HFSE and were likely derived in suprasubductional environments. The mafic and intermediate magmas were formed by melting a mantle wedge and subsequent fractionation of the melts. The acid melts could be formed by melting crustal rocks when they were overheated in the newly formed orogen of significant thickness. When ascending, the mantle melts could mix in variable proportions with acid melts in crustal chambers.
Sobre autores
D. Kovalenko
Institute of the Geology of Ore Deposits, Petrography, Mineralogy, and Geochemistry (IGEM)
Autor responsável pela correspondência
Email: dmitry@igem.ru
Rússia, Staromonetny per. 35, Moscow, 119017
V. Naumov
Vernadsky Institute of Geochemistry and Analytical Chemistry (GEOKhI)
Email: dmitry@igem.ru
Rússia, ul. Kosygina 19, Moscow, 119991
V. Prokofiev
Institute of the Geology of Ore Deposits, Petrography, Mineralogy, and Geochemistry (IGEM)
Email: dmitry@igem.ru
Rússia, Staromonetny per. 35, Moscow, 119017
O. Ageeva
Institute of the Geology of Ore Deposits, Petrography, Mineralogy, and Geochemistry (IGEM)
Email: dmitry@igem.ru
Rússia, Staromonetny per. 35, Moscow, 119017
O. Andreeva
Institute of the Geology of Ore Deposits, Petrography, Mineralogy, and Geochemistry (IGEM)
Email: dmitry@igem.ru
Rússia, Staromonetny per. 35, Moscow, 119017
E. Kovaltchuk
Institute of the Geology of Ore Deposits, Petrography, Mineralogy, and Geochemistry (IGEM)
Email: dmitry@igem.ru
Rússia, Staromonetny per. 35, Moscow, 119017
K. Erofeeva
Institute of the Geology of Ore Deposits, Petrography, Mineralogy, and Geochemistry (IGEM)
Email: dmitry@igem.ru
Rússia, Staromonetny per. 35, Moscow, 119017
N. Ugryumova
Institute of the Geology of Ore Deposits, Petrography, Mineralogy, and Geochemistry (IGEM)
Email: dmitry@igem.ru
Rússia, Staromonetny per. 35, Moscow, 119017