Composition and Geochemical Specifics of Magmatic Melts in Kamchatka: Evidence from Melt Inclusions and Quenched Glasses of Rocks
| Autor: | V. B. Naumov, V. A. Dorofeeva, M. L. Tolstykh, Andrei V. Girnis, V. V. Yarmolyuk |
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| Rok vydání: | 2020 |
| Předmět: |
020209 energy
Geochemistry 02 engineering and technology 010502 geochemistry & geophysics 01 natural sciences Geophysics Continental margin Geochemistry and Petrology 0202 electrical engineering electronic engineering information engineering Island arc Composition (visual arts) Mafic Geology 0105 earth and related environmental sciences Melt inclusions |
| Zdroj: | Geochemistry International. 58:271-290 |
| ISSN: | 1556-1968 0016-7029 |
| Popis: | The mean concentrations of volatiles, major, and trace elements are estimated in the magmatic melts of Kamchatka based on an our database that includes analyses of melt inclusions and quenched glasses of rocks for 75 elements (the database comprised 1 900 000 analyses as of late 2018). The determined concentrations are compared with analogous characteristics of melts from island arcs and active continental margins. The distribution of SiO2 concentrations (more than 105 000 analyses) in natural magmatic melts from all geodynamic environments is obviously bimodal, with maxima at SiO2 = 50–52 and 72–76 wt %. The paper presents binary diagrams that show the concentrations of major, volatile, trace elements, and REE and diagrams of the normalized patterns average concentrations of elements in the magmatic melts. The diagrams show distinguishing features of the melts of Kamchatka, for example, the elevated Ba/Nb ratios of Kamchatka mafic melts compared to those of melts in other zones, which may reflect a high content of subduction-related material during the derivation of the Kamchatka melts, with their Th deficit controlled by specifics of the fluid regime. |
| Databáze: | OpenAIRE |
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