Sources and Fluids in the Mantle Wedge below Kamchatka, Evidence from Across-arc Geochemical Variation
Major and trace element and Sr–Nd–Pb isotopic variations in mafic volcanic rocks hve been studied in a 220 km transect across the Kamchatka arc from the Eastern Volcanic Front, over the Central Kamchatka Depression to the Sredinny Ridge in the back-arc. Thirteen volcanoes and lava fields, from 110 t...
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ftinstvs:oai:repo.kscnet.ru:4308 2023-05-15T16:58:33+02:00 Sources and Fluids in the Mantle Wedge below Kamchatka, Evidence from Across-arc Geochemical Variation Churikova T. Dorendorf F. Wörner G. 2001 text http://repo.kscnet.ru/4308/ http://repo.kscnet.ru/4308/1/Churikova_et_al-2001.pdf https://doi.org/10.1093/petrology/42.8.1567 en eng http://repo.kscnet.ru/4308/1/Churikova_et_al-2001.pdf Churikova T. <http://repo.kscnet.ru/view/creators/Churikova=3AT=2E=3A=3A.html>, Dorendorf F. <http://repo.kscnet.ru/view/creators/Dorendorf=3AF=2E=3A=3A.html>, Wörner G. <http://repo.kscnet.ru/view/creators/W=F6rner=3AG=2E=3A=3A.html> (2001) Sources and Fluids in the Mantle Wedge below Kamchatka, Evidence from Across-arc Geochemical Variation // Journal of Petrology. Vol. 42, No. 8. pp. 1567-1593. doi:10.1093/petrology/42.8.1567 <http://doi.org/10.1093/petrology/42.8.1567>. 38.37.25 Вулканология Ахтанг Гамчен Ичинский Камень Харчинский Кизимен Комарова Николка Плоский Толбачик Шмидта Шивелуч Ушковский Ключевской Заречный Статья PeerReviewed 2001 ftinstvs https://doi.org/10.1093/petrology/42.8.1567 2022-08-09T17:07:01Z Major and trace element and Sr–Nd–Pb isotopic variations in mafic volcanic rocks hve been studied in a 220 km transect across the Kamchatka arc from the Eastern Volcanic Front, over the Central Kamchatka Depression to the Sredinny Ridge in the back-arc. Thirteen volcanoes and lava fields, from 110 to 400 km above the subducted slab, were sampled. This allows us to characterize spatial variations and the relative amount and composition of the slab fluid involved in magma genesis. Typical Kamchatka arc basalts, normalized for fractionation to 6% MgO, display a strong increase in large ion lithophile, light rare earth and high field strength elements from the arc front to the back-arc. Ba/Zr and Ce/Pb ratios, however, are nearly constant across the arc, which suggests a similar fluid input for Ba and Pb. La/Yb and Nb/Zr increase from the arc front to the back-arc. Rocks from the Central Kamchatka Depression range in 87Sr/86Sr from 0·70334 to 0·70366, but have almost constant Nd isotopic compositions (143Nd/144Nd 0·51307–0·51312). This correlates with the highest U/Th ratios in these rocks. Pb-isotopic ratios are mid-ocean ridge basalt (MORB)-like but decrease slightly from the volcanic front to the back-arc. The initial mantle source ranged from N-MORB-like in the volcanic front and Central Kamchatka Depression to more enriched in the back-arc. This enriched component is similar to an ocean-island basalt (OIB) source. Variations in (CaO)6·0–(Na2O)6·0 show that degree of melting decreases from the arc front to the Central Kamchatka Depression and remains constant from there to the Sredinny Ridge. Calculated fluid compositions have a similar trace element pattern across the arc, although minor differences are implied. A model is presented that quantifies the various mantle components (variably depleted N-MORB-mantle and enriched OIB-mantle) and the fluid compositions added to this mantle wedge. The amount of fluid added ranges from 0·7 to 2·1%. The degree of melting changes from ∼20% at the arc front to <10% below ... Text Kamchatka Ocean Island Institute of Volcanology and Seismology, Petropavlovsk-Kamchatsky: IVS FEB RAS Repository Journal of Petrology 42 8 1567 1593 |
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Open Polar |
collection |
Institute of Volcanology and Seismology, Petropavlovsk-Kamchatsky: IVS FEB RAS Repository |
op_collection_id |
ftinstvs |
language |
English |
topic |
38.37.25 Вулканология Ахтанг Гамчен Ичинский Камень Харчинский Кизимен Комарова Николка Плоский Толбачик Шмидта Шивелуч Ушковский Ключевской Заречный |
spellingShingle |
38.37.25 Вулканология Ахтанг Гамчен Ичинский Камень Харчинский Кизимен Комарова Николка Плоский Толбачик Шмидта Шивелуч Ушковский Ключевской Заречный Churikova T. Dorendorf F. Wörner G. Sources and Fluids in the Mantle Wedge below Kamchatka, Evidence from Across-arc Geochemical Variation |
topic_facet |
38.37.25 Вулканология Ахтанг Гамчен Ичинский Камень Харчинский Кизимен Комарова Николка Плоский Толбачик Шмидта Шивелуч Ушковский Ключевской Заречный |
description |
Major and trace element and Sr–Nd–Pb isotopic variations in mafic volcanic rocks hve been studied in a 220 km transect across the Kamchatka arc from the Eastern Volcanic Front, over the Central Kamchatka Depression to the Sredinny Ridge in the back-arc. Thirteen volcanoes and lava fields, from 110 to 400 km above the subducted slab, were sampled. This allows us to characterize spatial variations and the relative amount and composition of the slab fluid involved in magma genesis. Typical Kamchatka arc basalts, normalized for fractionation to 6% MgO, display a strong increase in large ion lithophile, light rare earth and high field strength elements from the arc front to the back-arc. Ba/Zr and Ce/Pb ratios, however, are nearly constant across the arc, which suggests a similar fluid input for Ba and Pb. La/Yb and Nb/Zr increase from the arc front to the back-arc. Rocks from the Central Kamchatka Depression range in 87Sr/86Sr from 0·70334 to 0·70366, but have almost constant Nd isotopic compositions (143Nd/144Nd 0·51307–0·51312). This correlates with the highest U/Th ratios in these rocks. Pb-isotopic ratios are mid-ocean ridge basalt (MORB)-like but decrease slightly from the volcanic front to the back-arc. The initial mantle source ranged from N-MORB-like in the volcanic front and Central Kamchatka Depression to more enriched in the back-arc. This enriched component is similar to an ocean-island basalt (OIB) source. Variations in (CaO)6·0–(Na2O)6·0 show that degree of melting decreases from the arc front to the Central Kamchatka Depression and remains constant from there to the Sredinny Ridge. Calculated fluid compositions have a similar trace element pattern across the arc, although minor differences are implied. A model is presented that quantifies the various mantle components (variably depleted N-MORB-mantle and enriched OIB-mantle) and the fluid compositions added to this mantle wedge. The amount of fluid added ranges from 0·7 to 2·1%. The degree of melting changes from ∼20% at the arc front to <10% below ... |
format |
Text |
author |
Churikova T. Dorendorf F. Wörner G. |
author_facet |
Churikova T. Dorendorf F. Wörner G. |
author_sort |
Churikova T. |
title |
Sources and Fluids in the Mantle Wedge below Kamchatka, Evidence from Across-arc Geochemical Variation |
title_short |
Sources and Fluids in the Mantle Wedge below Kamchatka, Evidence from Across-arc Geochemical Variation |
title_full |
Sources and Fluids in the Mantle Wedge below Kamchatka, Evidence from Across-arc Geochemical Variation |
title_fullStr |
Sources and Fluids in the Mantle Wedge below Kamchatka, Evidence from Across-arc Geochemical Variation |
title_full_unstemmed |
Sources and Fluids in the Mantle Wedge below Kamchatka, Evidence from Across-arc Geochemical Variation |
title_sort |
sources and fluids in the mantle wedge below kamchatka, evidence from across-arc geochemical variation |
publishDate |
2001 |
url |
http://repo.kscnet.ru/4308/ http://repo.kscnet.ru/4308/1/Churikova_et_al-2001.pdf https://doi.org/10.1093/petrology/42.8.1567 |
genre |
Kamchatka Ocean Island |
genre_facet |
Kamchatka Ocean Island |
op_relation |
http://repo.kscnet.ru/4308/1/Churikova_et_al-2001.pdf Churikova T. <http://repo.kscnet.ru/view/creators/Churikova=3AT=2E=3A=3A.html>, Dorendorf F. <http://repo.kscnet.ru/view/creators/Dorendorf=3AF=2E=3A=3A.html>, Wörner G. <http://repo.kscnet.ru/view/creators/W=F6rner=3AG=2E=3A=3A.html> (2001) Sources and Fluids in the Mantle Wedge below Kamchatka, Evidence from Across-arc Geochemical Variation // Journal of Petrology. Vol. 42, No. 8. pp. 1567-1593. doi:10.1093/petrology/42.8.1567 <http://doi.org/10.1093/petrology/42.8.1567>. |
op_doi |
https://doi.org/10.1093/petrology/42.8.1567 |
container_title |
Journal of Petrology |
container_volume |
42 |
container_issue |
8 |
container_start_page |
1567 |
op_container_end_page |
1593 |
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1766050586503938048 |