Transition from arc to oceanic magmatism at the Kamchatka-Aleutian junction
Spatial geochemical variations of Quaternary lavas erupted along the northern segment of the Kamchatka arc are used to trace changes in magma generation across the subducting Pacific slab edge. The late Pleistocene–Holocene lavas of the northern end of the Central Kamchatka depression north of the P...
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GSA (Geological Society of America)
2005
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Online Access: | https://oceanrep.geomar.de/id/eprint/1891/ https://oceanrep.geomar.de/id/eprint/1891/1/Portnyagin.pdf http://geology.geoscienceworld.org/cgi/content/abstract/33/1/25 https://doi.org/10.1130/G20853.1 |
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ftoceanrep:oai:oceanrep.geomar.de:1891 2023-05-15T16:58:10+02:00 Transition from arc to oceanic magmatism at the Kamchatka-Aleutian junction Portnyagin, Maxim Hoernle, Kaj Avdeiko, G.P. Hauff, Folkmar Werner, Reinhard Bindeman, I. Uspensky, V.S. Garbe-Schönberg, C.-Dieter 2005 text https://oceanrep.geomar.de/id/eprint/1891/ https://oceanrep.geomar.de/id/eprint/1891/1/Portnyagin.pdf http://geology.geoscienceworld.org/cgi/content/abstract/33/1/25 https://doi.org/10.1130/G20853.1 en eng GSA (Geological Society of America) https://oceanrep.geomar.de/id/eprint/1891/1/Portnyagin.pdf Portnyagin, M. , Hoernle, K. , Avdeiko, G. P., Hauff, F. , Werner, R., Bindeman, I., Uspensky, V. S. and Garbe-Schönberg, C. D. (2005) Transition from arc to oceanic magmatism at the Kamchatka-Aleutian junction. Geology, 33 (1). pp. 25-28. DOI 10.1130/G20853.1 <https://doi.org/10.1130/G20853.1>. doi:10.1130/G20853.1 info:eu-repo/semantics/restrictedAccess Article PeerReviewed 2005 ftoceanrep https://doi.org/10.1130/G20853.1 2023-04-07T14:44:51Z Spatial geochemical variations of Quaternary lavas erupted along the northern segment of the Kamchatka arc are used to trace changes in magma generation across the subducting Pacific slab edge. The late Pleistocene–Holocene lavas of the northern end of the Central Kamchatka depression north of the Pacific slab edge show strong enrichment in high field strength elements and light rare earth elements, relatively unradiogenic strontium and lead but radiogenic neodymium isotope ratios, and oxygen isotope compositions similar to those of mid-oceanic-ridge basalts. These geochemical characteristics are distinct from the southern Central Kamchatka depression volcanoes located above the subducting Pacific slab. Extensive fluid-triggered mantle melting dominates magma genesis beneath the largest Kamchatka volcanoes in the south, whereas low-degree decompression melting of the Pacific asthenospheric mantle is the major magma generation process north of the Pacific slab edge. Quaternary detachment of the subducted Pacific plate fragment resulted in the influx of fertile mantle beneath Kamchatka. We propose that upwelling and southward flow of this hotter, more fertile mantle is the main reason for recent magmatism in northern Kamchatka and for the exceptional productivity of the Central Kamchatka depression volcanoes (Klyuchevskoy and Sheveluch), the most active arc volcanoes on Earth. Article in Journal/Newspaper Kamchatka OceanRep (GEOMAR Helmholtz Centre für Ocean Research Kiel) Pacific Geology 33 1 25 |
institution |
Open Polar |
collection |
OceanRep (GEOMAR Helmholtz Centre für Ocean Research Kiel) |
op_collection_id |
ftoceanrep |
language |
English |
description |
Spatial geochemical variations of Quaternary lavas erupted along the northern segment of the Kamchatka arc are used to trace changes in magma generation across the subducting Pacific slab edge. The late Pleistocene–Holocene lavas of the northern end of the Central Kamchatka depression north of the Pacific slab edge show strong enrichment in high field strength elements and light rare earth elements, relatively unradiogenic strontium and lead but radiogenic neodymium isotope ratios, and oxygen isotope compositions similar to those of mid-oceanic-ridge basalts. These geochemical characteristics are distinct from the southern Central Kamchatka depression volcanoes located above the subducting Pacific slab. Extensive fluid-triggered mantle melting dominates magma genesis beneath the largest Kamchatka volcanoes in the south, whereas low-degree decompression melting of the Pacific asthenospheric mantle is the major magma generation process north of the Pacific slab edge. Quaternary detachment of the subducted Pacific plate fragment resulted in the influx of fertile mantle beneath Kamchatka. We propose that upwelling and southward flow of this hotter, more fertile mantle is the main reason for recent magmatism in northern Kamchatka and for the exceptional productivity of the Central Kamchatka depression volcanoes (Klyuchevskoy and Sheveluch), the most active arc volcanoes on Earth. |
format |
Article in Journal/Newspaper |
author |
Portnyagin, Maxim Hoernle, Kaj Avdeiko, G.P. Hauff, Folkmar Werner, Reinhard Bindeman, I. Uspensky, V.S. Garbe-Schönberg, C.-Dieter |
spellingShingle |
Portnyagin, Maxim Hoernle, Kaj Avdeiko, G.P. Hauff, Folkmar Werner, Reinhard Bindeman, I. Uspensky, V.S. Garbe-Schönberg, C.-Dieter Transition from arc to oceanic magmatism at the Kamchatka-Aleutian junction |
author_facet |
Portnyagin, Maxim Hoernle, Kaj Avdeiko, G.P. Hauff, Folkmar Werner, Reinhard Bindeman, I. Uspensky, V.S. Garbe-Schönberg, C.-Dieter |
author_sort |
Portnyagin, Maxim |
title |
Transition from arc to oceanic magmatism at the Kamchatka-Aleutian junction |
title_short |
Transition from arc to oceanic magmatism at the Kamchatka-Aleutian junction |
title_full |
Transition from arc to oceanic magmatism at the Kamchatka-Aleutian junction |
title_fullStr |
Transition from arc to oceanic magmatism at the Kamchatka-Aleutian junction |
title_full_unstemmed |
Transition from arc to oceanic magmatism at the Kamchatka-Aleutian junction |
title_sort |
transition from arc to oceanic magmatism at the kamchatka-aleutian junction |
publisher |
GSA (Geological Society of America) |
publishDate |
2005 |
url |
https://oceanrep.geomar.de/id/eprint/1891/ https://oceanrep.geomar.de/id/eprint/1891/1/Portnyagin.pdf http://geology.geoscienceworld.org/cgi/content/abstract/33/1/25 https://doi.org/10.1130/G20853.1 |
geographic |
Pacific |
geographic_facet |
Pacific |
genre |
Kamchatka |
genre_facet |
Kamchatka |
op_relation |
https://oceanrep.geomar.de/id/eprint/1891/1/Portnyagin.pdf Portnyagin, M. , Hoernle, K. , Avdeiko, G. P., Hauff, F. , Werner, R., Bindeman, I., Uspensky, V. S. and Garbe-Schönberg, C. D. (2005) Transition from arc to oceanic magmatism at the Kamchatka-Aleutian junction. Geology, 33 (1). pp. 25-28. DOI 10.1130/G20853.1 <https://doi.org/10.1130/G20853.1>. doi:10.1130/G20853.1 |
op_rights |
info:eu-repo/semantics/restrictedAccess |
op_doi |
https://doi.org/10.1130/G20853.1 |
container_title |
Geology |
container_volume |
33 |
container_issue |
1 |
container_start_page |
25 |
_version_ |
1766049980587442176 |