Bowers Ridge (Bering Sea): An Oligocene-Early Miocene island arc
Bowers Ridge is an similar to 700 km long arcuate ridge behind the Central Aleutian Arc in the Bering Sea. The lack of age and geochemical data for the ridge has hampered the development of geodynamic models for the evolution of the North Pacific and the Aleutian-Bering Sea region. Here we present t...
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Language: | English |
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GSA, Geological Society of America
2012
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Online Access: | https://oceanrep.geomar.de/id/eprint/15300/ https://oceanrep.geomar.de/id/eprint/15300/1/G33058.1.full.pdf https://doi.org/10.1130/G33058.1 |
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ftoceanrep:oai:oceanrep.geomar.de:15300 2023-05-15T15:43:25+02:00 Bowers Ridge (Bering Sea): An Oligocene-Early Miocene island arc Wanke, Maren Portnyagin, Maxim V. Hoernle, Kaj A. Werner, Reinhard Hauff, Folkmar van den Bogaard, Paul Garbe-Schönberg, Dieter 2012 text https://oceanrep.geomar.de/id/eprint/15300/ https://oceanrep.geomar.de/id/eprint/15300/1/G33058.1.full.pdf https://doi.org/10.1130/G33058.1 en eng GSA, Geological Society of America https://oceanrep.geomar.de/id/eprint/15300/1/G33058.1.full.pdf Wanke, M., Portnyagin, M. V. , Hoernle, K. A. , Werner, R., Hauff, F. , van den Bogaard, P. and Garbe-Schönberg, D. (2012) Bowers Ridge (Bering Sea): An Oligocene-Early Miocene island arc. Geology, 40 (8). pp. 687-690. DOI 10.1130/G33058.1 <https://doi.org/10.1130/G33058.1>. doi:10.1130/G33058.1 info:eu-repo/semantics/restrictedAccess Article PeerReviewed 2012 ftoceanrep https://doi.org/10.1130/G33058.1 2023-04-07T15:05:11Z Bowers Ridge is an similar to 700 km long arcuate ridge behind the Central Aleutian Arc in the Bering Sea. The lack of age and geochemical data for the ridge has hampered the development of geodynamic models for the evolution of the North Pacific and the Aleutian-Bering Sea region. Here we present the first geochemical and Ar-40/Ar-39 age data for the volcanic basement of Bowers Ridge and a seamount from the western end of the ridge sampled during R/V Sonne cruise SO201-1b. The northern Bowers Ridge basement (26-32 Ma) consists of mafic to intermediate calc-alkaline rocks with adakite-like (Sr/Y = 33-53, La-N/Yb-N = 3.3-7.8), high field strength element (HFSE)-depleted (e.g., Nb-N/La-N = 0.07-0.31) trace element patterns and Sr-Nd-Pb isotope compositions within the Western Aleutian Arc array, implying magma generation above an obliquely subducting slab. The seamount samples (22-24 Ma) are HFSE-rich alkaline olivine basalts (La-N/Yb-N = 3.3-3.9, Nb-N/La-N = 1.0-1.4) with minor arc-type trace element signatures (Pb-N/Ce-N = 1.4-1.6, K-N/Nb-N = 1.7-1.9) but with Pacific mid-oceanic-ridge basalt (MORB)-like isotopic compositions, pointing to an origin by small-degree decompression melting from slightly subduction-modified mantle. The geochemistry of the recovered rocks can be explained by highly oblique subduction along the northern part of Bowers Ridge in its present-day configuration, consistent with an in-situ origin of Bowers Ridge as a Cenozoic island arc. Article in Journal/Newspaper Bering Sea OceanRep (GEOMAR Helmholtz Centre für Ocean Research Kiel) Bering Sea Bowers ENVELOPE(164.083,164.083,-85.000,-85.000) Pacific Geology 40 8 687 690 |
institution |
Open Polar |
collection |
OceanRep (GEOMAR Helmholtz Centre für Ocean Research Kiel) |
op_collection_id |
ftoceanrep |
language |
English |
description |
Bowers Ridge is an similar to 700 km long arcuate ridge behind the Central Aleutian Arc in the Bering Sea. The lack of age and geochemical data for the ridge has hampered the development of geodynamic models for the evolution of the North Pacific and the Aleutian-Bering Sea region. Here we present the first geochemical and Ar-40/Ar-39 age data for the volcanic basement of Bowers Ridge and a seamount from the western end of the ridge sampled during R/V Sonne cruise SO201-1b. The northern Bowers Ridge basement (26-32 Ma) consists of mafic to intermediate calc-alkaline rocks with adakite-like (Sr/Y = 33-53, La-N/Yb-N = 3.3-7.8), high field strength element (HFSE)-depleted (e.g., Nb-N/La-N = 0.07-0.31) trace element patterns and Sr-Nd-Pb isotope compositions within the Western Aleutian Arc array, implying magma generation above an obliquely subducting slab. The seamount samples (22-24 Ma) are HFSE-rich alkaline olivine basalts (La-N/Yb-N = 3.3-3.9, Nb-N/La-N = 1.0-1.4) with minor arc-type trace element signatures (Pb-N/Ce-N = 1.4-1.6, K-N/Nb-N = 1.7-1.9) but with Pacific mid-oceanic-ridge basalt (MORB)-like isotopic compositions, pointing to an origin by small-degree decompression melting from slightly subduction-modified mantle. The geochemistry of the recovered rocks can be explained by highly oblique subduction along the northern part of Bowers Ridge in its present-day configuration, consistent with an in-situ origin of Bowers Ridge as a Cenozoic island arc. |
format |
Article in Journal/Newspaper |
author |
Wanke, Maren Portnyagin, Maxim V. Hoernle, Kaj A. Werner, Reinhard Hauff, Folkmar van den Bogaard, Paul Garbe-Schönberg, Dieter |
spellingShingle |
Wanke, Maren Portnyagin, Maxim V. Hoernle, Kaj A. Werner, Reinhard Hauff, Folkmar van den Bogaard, Paul Garbe-Schönberg, Dieter Bowers Ridge (Bering Sea): An Oligocene-Early Miocene island arc |
author_facet |
Wanke, Maren Portnyagin, Maxim V. Hoernle, Kaj A. Werner, Reinhard Hauff, Folkmar van den Bogaard, Paul Garbe-Schönberg, Dieter |
author_sort |
Wanke, Maren |
title |
Bowers Ridge (Bering Sea): An Oligocene-Early Miocene island arc |
title_short |
Bowers Ridge (Bering Sea): An Oligocene-Early Miocene island arc |
title_full |
Bowers Ridge (Bering Sea): An Oligocene-Early Miocene island arc |
title_fullStr |
Bowers Ridge (Bering Sea): An Oligocene-Early Miocene island arc |
title_full_unstemmed |
Bowers Ridge (Bering Sea): An Oligocene-Early Miocene island arc |
title_sort |
bowers ridge (bering sea): an oligocene-early miocene island arc |
publisher |
GSA, Geological Society of America |
publishDate |
2012 |
url |
https://oceanrep.geomar.de/id/eprint/15300/ https://oceanrep.geomar.de/id/eprint/15300/1/G33058.1.full.pdf https://doi.org/10.1130/G33058.1 |
long_lat |
ENVELOPE(164.083,164.083,-85.000,-85.000) |
geographic |
Bering Sea Bowers Pacific |
geographic_facet |
Bering Sea Bowers Pacific |
genre |
Bering Sea |
genre_facet |
Bering Sea |
op_relation |
https://oceanrep.geomar.de/id/eprint/15300/1/G33058.1.full.pdf Wanke, M., Portnyagin, M. V. , Hoernle, K. A. , Werner, R., Hauff, F. , van den Bogaard, P. and Garbe-Schönberg, D. (2012) Bowers Ridge (Bering Sea): An Oligocene-Early Miocene island arc. Geology, 40 (8). pp. 687-690. DOI 10.1130/G33058.1 <https://doi.org/10.1130/G33058.1>. doi:10.1130/G33058.1 |
op_rights |
info:eu-repo/semantics/restrictedAccess |
op_doi |
https://doi.org/10.1130/G33058.1 |
container_title |
Geology |
container_volume |
40 |
container_issue |
8 |
container_start_page |
687 |
op_container_end_page |
690 |
_version_ |
1766377543015858176 |