New Data on the Rock and Mineral Composition of Kharchinsky and Zarechny Volcanoes, Central Kamchatka Depression: Heterogeneity of the Mantle Source and Peculiarities of Magma Evolution in the Crust
Kharchinsky and Zarechny volcanoes and the Kharchinsky Lake zone of monogenic cones are unique eruptive centers of magnesian lavas located above the northern margin of the Pacific plate subducting beneath Kamchatka. This paper presents new geochemical data on the composition of rocks (55 samples) an...
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2023
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ftoceanrep:oai:oceanrep.geomar.de:58845 2024-02-11T10:05:24+01:00 New Data on the Rock and Mineral Composition of Kharchinsky and Zarechny Volcanoes, Central Kamchatka Depression: Heterogeneity of the Mantle Source and Peculiarities of Magma Evolution in the Crust Gorbach, N. V. Nekrylov, N. A. Portnyagin, Maxim Hoernle, Kaj 2023-06-28 text https://oceanrep.geomar.de/id/eprint/58845/ https://oceanrep.geomar.de/id/eprint/58845/1/S0869591123030050.pdf https://oceanrep.geomar.de/id/eprint/58845/2/11495_2023_8164_MOESM1_ESM.xlsx https://doi.org/10.1134/S0869591123030050 en eng Springer Pleiades https://oceanrep.geomar.de/id/eprint/58845/1/S0869591123030050.pdf https://oceanrep.geomar.de/id/eprint/58845/2/11495_2023_8164_MOESM1_ESM.xlsx Gorbach, N. V., Nekrylov, N. A., Portnyagin, M. and Hoernle, K. (2023) New Data on the Rock and Mineral Composition of Kharchinsky and Zarechny Volcanoes, Central Kamchatka Depression: Heterogeneity of the Mantle Source and Peculiarities of Magma Evolution in the Crust. Petrology, 31 (3). pp. 320-337. DOI 10.1134/S0869591123030050 <https://doi.org/10.1134/S0869591123030050>. doi:10.1134/S0869591123030050 info:eu-repo/semantics/restrictedAccess Article PeerReviewed 2023 ftoceanrep https://doi.org/10.1134/S0869591123030050 2024-01-15T00:27:16Z Kharchinsky and Zarechny volcanoes and the Kharchinsky Lake zone of monogenic cones are unique eruptive centers of magnesian lavas located above the northern margin of the Pacific plate subducting beneath Kamchatka. This paper presents new geochemical data on the composition of rocks (55 samples) and minerals (over 900 analyses of olivine, pyroxenes, amphibole, and plagioclase) of these centers analyzed by XRF and LA-ICP-MS (rocks) and electron microprobe (minerals). Most of the studied rocks are magnesian (Mg# = 60–75 mol %) medium-K basalts and basaltic andesites. Moderate-magnesian (Mg# = 52–59 mol %) basaltic andesites are present among the monogenic cones of Kharchinsky Lake. The rare rock varieties include the high-K basalts–basaltic andesites of dikes in the center of Kharchinsky volcano and the magnesian andesites (Mg# = 58–61 mol %) of the extrusions of Zarechnу volcano. The distribution of trace-element contents in these samples demonstrates enrichment in large-ion lithophile elements and light REEs at depletion in high field strength elements and heavy REEs, as is typical of arc rocks. The high-K basalts and basaltic andesites show anomalous enrichment in Ba (>1000 ppm), Th (>3.8 ppm), U (>1.8 ppm), Sr (> 800 ppm, Sr/Y > 50), and light REE (La > 20 ppm), and their compositions are close to those of low-Si adakites. The basalts and basaltic andesites contain phenocrysts of high-Mg olivine (up to Fo92.6) and clinopyroxene (Mg # up to 91 mol %). The rocks show petrographic and geochemical evidence of fractional crystallization, along with the processes of mineral accumulation and magma mixing. Some of the olivine phenocrysts show high NiO contents (up to 5000 ppm) and an elevated Fe/Mn ratio (up to 80), which were interpreted as evidence of the participation of a pyroxenite source in the magma generation processes. The use of the Ca/Fe and Ni/Mg ratios allowed us to distinguish the composition fields and evolution trends of olivine associated with different sources: peridotite and ... Article in Journal/Newspaper Kamchatka OceanRep (GEOMAR Helmholtz Centre für Ocean Research Kiel) Pacific Petrology 31 3 320 337 |
institution |
Open Polar |
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OceanRep (GEOMAR Helmholtz Centre für Ocean Research Kiel) |
op_collection_id |
ftoceanrep |
language |
English |
description |
Kharchinsky and Zarechny volcanoes and the Kharchinsky Lake zone of monogenic cones are unique eruptive centers of magnesian lavas located above the northern margin of the Pacific plate subducting beneath Kamchatka. This paper presents new geochemical data on the composition of rocks (55 samples) and minerals (over 900 analyses of olivine, pyroxenes, amphibole, and plagioclase) of these centers analyzed by XRF and LA-ICP-MS (rocks) and electron microprobe (minerals). Most of the studied rocks are magnesian (Mg# = 60–75 mol %) medium-K basalts and basaltic andesites. Moderate-magnesian (Mg# = 52–59 mol %) basaltic andesites are present among the monogenic cones of Kharchinsky Lake. The rare rock varieties include the high-K basalts–basaltic andesites of dikes in the center of Kharchinsky volcano and the magnesian andesites (Mg# = 58–61 mol %) of the extrusions of Zarechnу volcano. The distribution of trace-element contents in these samples demonstrates enrichment in large-ion lithophile elements and light REEs at depletion in high field strength elements and heavy REEs, as is typical of arc rocks. The high-K basalts and basaltic andesites show anomalous enrichment in Ba (>1000 ppm), Th (>3.8 ppm), U (>1.8 ppm), Sr (> 800 ppm, Sr/Y > 50), and light REE (La > 20 ppm), and their compositions are close to those of low-Si adakites. The basalts and basaltic andesites contain phenocrysts of high-Mg olivine (up to Fo92.6) and clinopyroxene (Mg # up to 91 mol %). The rocks show petrographic and geochemical evidence of fractional crystallization, along with the processes of mineral accumulation and magma mixing. Some of the olivine phenocrysts show high NiO contents (up to 5000 ppm) and an elevated Fe/Mn ratio (up to 80), which were interpreted as evidence of the participation of a pyroxenite source in the magma generation processes. The use of the Ca/Fe and Ni/Mg ratios allowed us to distinguish the composition fields and evolution trends of olivine associated with different sources: peridotite and ... |
format |
Article in Journal/Newspaper |
author |
Gorbach, N. V. Nekrylov, N. A. Portnyagin, Maxim Hoernle, Kaj |
spellingShingle |
Gorbach, N. V. Nekrylov, N. A. Portnyagin, Maxim Hoernle, Kaj New Data on the Rock and Mineral Composition of Kharchinsky and Zarechny Volcanoes, Central Kamchatka Depression: Heterogeneity of the Mantle Source and Peculiarities of Magma Evolution in the Crust |
author_facet |
Gorbach, N. V. Nekrylov, N. A. Portnyagin, Maxim Hoernle, Kaj |
author_sort |
Gorbach, N. V. |
title |
New Data on the Rock and Mineral Composition of Kharchinsky and Zarechny Volcanoes, Central Kamchatka Depression: Heterogeneity of the Mantle Source and Peculiarities of Magma Evolution in the Crust |
title_short |
New Data on the Rock and Mineral Composition of Kharchinsky and Zarechny Volcanoes, Central Kamchatka Depression: Heterogeneity of the Mantle Source and Peculiarities of Magma Evolution in the Crust |
title_full |
New Data on the Rock and Mineral Composition of Kharchinsky and Zarechny Volcanoes, Central Kamchatka Depression: Heterogeneity of the Mantle Source and Peculiarities of Magma Evolution in the Crust |
title_fullStr |
New Data on the Rock and Mineral Composition of Kharchinsky and Zarechny Volcanoes, Central Kamchatka Depression: Heterogeneity of the Mantle Source and Peculiarities of Magma Evolution in the Crust |
title_full_unstemmed |
New Data on the Rock and Mineral Composition of Kharchinsky and Zarechny Volcanoes, Central Kamchatka Depression: Heterogeneity of the Mantle Source and Peculiarities of Magma Evolution in the Crust |
title_sort |
new data on the rock and mineral composition of kharchinsky and zarechny volcanoes, central kamchatka depression: heterogeneity of the mantle source and peculiarities of magma evolution in the crust |
publisher |
Springer |
publishDate |
2023 |
url |
https://oceanrep.geomar.de/id/eprint/58845/ https://oceanrep.geomar.de/id/eprint/58845/1/S0869591123030050.pdf https://oceanrep.geomar.de/id/eprint/58845/2/11495_2023_8164_MOESM1_ESM.xlsx https://doi.org/10.1134/S0869591123030050 |
geographic |
Pacific |
geographic_facet |
Pacific |
genre |
Kamchatka |
genre_facet |
Kamchatka |
op_relation |
https://oceanrep.geomar.de/id/eprint/58845/1/S0869591123030050.pdf https://oceanrep.geomar.de/id/eprint/58845/2/11495_2023_8164_MOESM1_ESM.xlsx Gorbach, N. V., Nekrylov, N. A., Portnyagin, M. and Hoernle, K. (2023) New Data on the Rock and Mineral Composition of Kharchinsky and Zarechny Volcanoes, Central Kamchatka Depression: Heterogeneity of the Mantle Source and Peculiarities of Magma Evolution in the Crust. Petrology, 31 (3). pp. 320-337. DOI 10.1134/S0869591123030050 <https://doi.org/10.1134/S0869591123030050>. doi:10.1134/S0869591123030050 |
op_rights |
info:eu-repo/semantics/restrictedAccess |
op_doi |
https://doi.org/10.1134/S0869591123030050 |
container_title |
Petrology |
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31 |
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3 |
container_start_page |
320 |
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337 |
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1790602433536196608 |