Progressive changes in magma transport at the active Serreta Ridge, Azores
Volcanism in the Eastern Azores Plateau occurs at large central volcanoes and along subaerial and submarine fissure zones, resulting from a mantle melting anomaly combined with transtensional stresses. Volcanic structures are aligned WNW-ESE and NW-SE, reflecting two tectonic stress fields that cont...
Published in: | Geochemistry, Geophysics, Geosystems |
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American Geophysical Union
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Online Access: | http://hdl.handle.net/10138/311681 |
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ftunivhelsihelda:oai:helda.helsinki.fi:10138/311681 2024-01-07T09:44:25+01:00 Progressive changes in magma transport at the active Serreta Ridge, Azores Romer, R.H.W. Beier, C. Haase, K.M. Klügel, A. Hamelin, C. Department of Geosciences and Geography 2020-02-14T12:55:05Z 21 application/pdf http://hdl.handle.net/10138/311681 eng eng American Geophysical Union 10.1029/2019GC008562 Romer , R H W , Beier , C , Haase , K M , Klügel , A & Hamelin , C 2019 , ' Progressive changes in magma transport at the active Serreta Ridge, Azores ' , Geochemistry, geophysics, geosystems G³. , vol. 20 , pp. 5394-5414 . https://doi.org/10.1029/2019GC008562 RIS: urn:FF7163ED9577FBDBFC0A20569E4E553D ORCID: /0000-0001-7014-7049/work/70951965 79777be9-4ac6-4ff8-a293-f028c6b67ca7 http://hdl.handle.net/10138/311681 000499031500001 cc_by_nc_nd openAccess info:eu-repo/semantics/openAccess 1171 Geosciences ocean island magmatic tectonic evolution melt transport Azores TERCEIRA ISLAND AZORES K-AR AGES ISOTOPE EVIDENCE JORGE ISLAND MANTLE HETEROGENEITY VOLCANIC ISLANDS SAO-MIGUEL PLATE BOUNDARY RIFT ZONES MID-ATLANTIC RIDGE Article publishedVersion 2020 ftunivhelsihelda 2023-12-14T00:12:51Z Volcanism in the Eastern Azores Plateau occurs at large central volcanoes and along subaerial and submarine fissure zones, resulting from a mantle melting anomaly combined with transtensional stresses. Volcanic structures are aligned WNW-ESE and NW-SE, reflecting two tectonic stress fields that control the direction of lateral melt transport. Terceira Island is influenced by both stress fields, dividing the island into an eastern and western part. Several submarine volcanic ridges with variable orientations are located west of Santa Barbara, the youngest central volcano on Terceira. Major, trace element and Sr-Nd-Pb-Hf isotope compositions from submarine lavas and glasses, in part associated with the 1998-2001 Serreta Ridge eruption, vary between different lava suites, suggesting a formation from different mantle sources. Submarine lavas are more primitive than those from Santa Barbara volcano, indicating that they are not laterally connected with the shallow magma reservoir located in 2- to 5-km depth beneath the central volcano. Mineral thermobarometric data suggest that the older Serreta magmas were laterally transported at depths >5 km from Santa Barbara predominantly in WNW direction. We propose that lithospheric extension controls magma transport from the central volcano to Serreta Ridge. The youngest Serreta lavas differ from Santa Barbara and other submarine ridges in having less radiogenic Pb and higher Hf isotope ratios representing a new magma pulse ascending from the mantle. We conclude that lateral magma transport and the morphology of volcanic ridges are controlled by tectonic stresses in the lithosphere, whereas vertical melt transport is initiated by processes in the mantle. Peer reviewed Article in Journal/Newspaper Jorge Island Ocean Island HELDA – University of Helsinki Open Repository Jorge Island ENVELOPE(-59.767,-59.767,-62.383,-62.383) Mid-Atlantic Ridge Geochemistry, Geophysics, Geosystems 20 11 5394 5414 |
institution |
Open Polar |
collection |
HELDA – University of Helsinki Open Repository |
op_collection_id |
ftunivhelsihelda |
language |
English |
topic |
1171 Geosciences ocean island magmatic tectonic evolution melt transport Azores TERCEIRA ISLAND AZORES K-AR AGES ISOTOPE EVIDENCE JORGE ISLAND MANTLE HETEROGENEITY VOLCANIC ISLANDS SAO-MIGUEL PLATE BOUNDARY RIFT ZONES MID-ATLANTIC RIDGE |
spellingShingle |
1171 Geosciences ocean island magmatic tectonic evolution melt transport Azores TERCEIRA ISLAND AZORES K-AR AGES ISOTOPE EVIDENCE JORGE ISLAND MANTLE HETEROGENEITY VOLCANIC ISLANDS SAO-MIGUEL PLATE BOUNDARY RIFT ZONES MID-ATLANTIC RIDGE Romer, R.H.W. Beier, C. Haase, K.M. Klügel, A. Hamelin, C. Progressive changes in magma transport at the active Serreta Ridge, Azores |
topic_facet |
1171 Geosciences ocean island magmatic tectonic evolution melt transport Azores TERCEIRA ISLAND AZORES K-AR AGES ISOTOPE EVIDENCE JORGE ISLAND MANTLE HETEROGENEITY VOLCANIC ISLANDS SAO-MIGUEL PLATE BOUNDARY RIFT ZONES MID-ATLANTIC RIDGE |
description |
Volcanism in the Eastern Azores Plateau occurs at large central volcanoes and along subaerial and submarine fissure zones, resulting from a mantle melting anomaly combined with transtensional stresses. Volcanic structures are aligned WNW-ESE and NW-SE, reflecting two tectonic stress fields that control the direction of lateral melt transport. Terceira Island is influenced by both stress fields, dividing the island into an eastern and western part. Several submarine volcanic ridges with variable orientations are located west of Santa Barbara, the youngest central volcano on Terceira. Major, trace element and Sr-Nd-Pb-Hf isotope compositions from submarine lavas and glasses, in part associated with the 1998-2001 Serreta Ridge eruption, vary between different lava suites, suggesting a formation from different mantle sources. Submarine lavas are more primitive than those from Santa Barbara volcano, indicating that they are not laterally connected with the shallow magma reservoir located in 2- to 5-km depth beneath the central volcano. Mineral thermobarometric data suggest that the older Serreta magmas were laterally transported at depths >5 km from Santa Barbara predominantly in WNW direction. We propose that lithospheric extension controls magma transport from the central volcano to Serreta Ridge. The youngest Serreta lavas differ from Santa Barbara and other submarine ridges in having less radiogenic Pb and higher Hf isotope ratios representing a new magma pulse ascending from the mantle. We conclude that lateral magma transport and the morphology of volcanic ridges are controlled by tectonic stresses in the lithosphere, whereas vertical melt transport is initiated by processes in the mantle. Peer reviewed |
author2 |
Department of Geosciences and Geography |
format |
Article in Journal/Newspaper |
author |
Romer, R.H.W. Beier, C. Haase, K.M. Klügel, A. Hamelin, C. |
author_facet |
Romer, R.H.W. Beier, C. Haase, K.M. Klügel, A. Hamelin, C. |
author_sort |
Romer, R.H.W. |
title |
Progressive changes in magma transport at the active Serreta Ridge, Azores |
title_short |
Progressive changes in magma transport at the active Serreta Ridge, Azores |
title_full |
Progressive changes in magma transport at the active Serreta Ridge, Azores |
title_fullStr |
Progressive changes in magma transport at the active Serreta Ridge, Azores |
title_full_unstemmed |
Progressive changes in magma transport at the active Serreta Ridge, Azores |
title_sort |
progressive changes in magma transport at the active serreta ridge, azores |
publisher |
American Geophysical Union |
publishDate |
2020 |
url |
http://hdl.handle.net/10138/311681 |
long_lat |
ENVELOPE(-59.767,-59.767,-62.383,-62.383) |
geographic |
Jorge Island Mid-Atlantic Ridge |
geographic_facet |
Jorge Island Mid-Atlantic Ridge |
genre |
Jorge Island Ocean Island |
genre_facet |
Jorge Island Ocean Island |
op_relation |
10.1029/2019GC008562 Romer , R H W , Beier , C , Haase , K M , Klügel , A & Hamelin , C 2019 , ' Progressive changes in magma transport at the active Serreta Ridge, Azores ' , Geochemistry, geophysics, geosystems G³. , vol. 20 , pp. 5394-5414 . https://doi.org/10.1029/2019GC008562 RIS: urn:FF7163ED9577FBDBFC0A20569E4E553D ORCID: /0000-0001-7014-7049/work/70951965 79777be9-4ac6-4ff8-a293-f028c6b67ca7 http://hdl.handle.net/10138/311681 000499031500001 |
op_rights |
cc_by_nc_nd openAccess info:eu-repo/semantics/openAccess |
container_title |
Geochemistry, Geophysics, Geosystems |
container_volume |
20 |
container_issue |
11 |
container_start_page |
5394 |
op_container_end_page |
5414 |
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1787425815565172736 |