Crustal structure of the Eurasia-Africa plate boundary across the Gloria Fault, North Atlantic Ocean
The oceanic crustal and uppermost lithospheric mantle structure across the Gloria Fault (GF) transcurrent plate boundary between Africa and Eurasia in the Northeast Atlantic is investigated based on seismic reflection, seismic refraction and wide-angle reflection data. This experiment used 18 ocean...
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Online Access: | http://hdl.handle.net/10400.21/9775 https://doi.org/10.1093/gji/ggx050 |
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ftinstplisboa:oai:repositorio.ipl.pt:10400.21/9775 2023-05-15T17:35:37+02:00 Crustal structure of the Eurasia-Africa plate boundary across the Gloria Fault, North Atlantic Ocean Batista, Luís Hubscher, Christian Terrinha, Pedro Matias, Luís Afilhado, Alexandra Ludmann, Thomas 2017-05 http://hdl.handle.net/10400.21/9775 https://doi.org/10.1093/gji/ggx050 eng eng Oxford University Press Hu698/19-1 - German Research Foundation (DFG) info:eu-repo/grantAgreement/FCT/SFRH/SFRH%2FBD%2F81351%2F2011/PT https://watermark.silverchair.com/ggx050.pdf?token=AQECAHi208BE49Ooan9kkhW_Ercy7Dm3ZL_9Cf3qfKAc485ysgAAAlMwggJPBgkqhkiG9w0BBwagggJAMIICPAIBADCCAjUGCSqGSIb3DQEHATAeBglghkgBZQMEAS4wEQQM8vJ1QLWybDuwxgPOAgEQgIICBrihZLhewTwd4q33ncit2CwkJt3hzE3xKRfLcUl6Vp9OCeZ-Xi1P3Dw_N-SS6b9gz9WVoWbSL4fQ8JAl3QAL-3N9gx3RhEbbXoXWid2fCz7SKUzkY_cftfMHbpGIjyZep1LjcC8oF1ZdT7LXAmQNJ1fX6Z1gYrOmPkhoarEX43E4ADb1Z0775KMPBPlPSlpp0t2mNSAZl_RWd2BOKNyq7IUR487odwAbQrdlIfKObk8J3r5q_mdLBYUIgZ4G2mTwnf7EQapLXlbXucXVO3z5d8FDujiX4aJbfsGyAeKg1T_jKZ5jJtbBm9r4CjaVv4ZiJaTH5VBtG-Y3St3rS7ALk-o3BwJk5VBOLbyn8U2jah8fA0d7vSjggMgRPcwzTU_bmeb4KtmH9O586Y5NAE0y2_H_IU4-0iPQo0v8g_juxxYp3vZ4mUH0Y3_9VzIeGQJD9qGspqTLvnsJJzZa-Fp3UpmVWMTl-486kSWOq7zYZ0tOsPJON4XuafhWYWb-kifU7h22PKg1GqwfXzPWoojHgSIPavzs5RkyMd6eGGmrU8F-Nyi5mNi9dN5kHd_VZNY9lpzULE3vdtFfI7CcpyZ-Hp40-McKCvZ6K4ZxumYIpFX_vOqHnRIy7-UAmA_ZsBwcYvxcEm76rwUGwsIVIwqqvveATO-Ojj0dWv0s9jGUntyc60B9pqOf BATISTA, Luís; [et al] – Crustal structure of the Eurasia-Africa plate boundary across the Gloria Fault, North Atlantic Ocean. Geophysical Journal International. ISSN 0956-540X. Vol. 209, N.º 2 (2017), pp. 713-729 0956-540X 1365-246X http://hdl.handle.net/10400.21/9775 doi:10.1093/gji/ggx050 closedAccess Composition of the oceanic crust Transform faults Oceanic transform and fracture zone processes Crustal structure Atlantic Ocean Composição da crosta oceânica Transformar falhas Estrutura crustal article 2017 ftinstplisboa https://doi.org/10.1093/gji/ggx050 2022-05-25T18:37:56Z The oceanic crustal and uppermost lithospheric mantle structure across the Gloria Fault (GF) transcurrent plate boundary between Africa and Eurasia in the Northeast Atlantic is investigated based on seismic reflection, seismic refraction and wide-angle reflection data. This experiment used 18 ocean bottom stations along an N-S 150 km long traverse together with acquisition of a multichannel seismic reflection profile. Modeling of P and S seismic waves and gravimetric anomalies allowed estimation of P- and S-wave velocities, density, Poisson's ratio and discussion of a compositional model. A five-layer model is proposed in which layers 1-3 correspond to normal sediments through typical oceanic crust layers 2 and 3. Layer 5 yielded mantle velocities above 7.9 km s(-1). Layer 4 with 4 km of thickness has Vp velocities between 7.1 and 7.4 km s(-1) and is clearly separated from typical oceanic crust and mantle layers. Comparison with natural analogues and published lab measurements suggest that layer 4 can be a mix of lithologies that comply with the estimated P and S velocities and computed Poisson's ratio and densities, such as, olivine cumulates, peridotite, gabbro and hydrated mantle. We favour the tectonic process that produces secondary porosity from which results serpentinization due to sea water circulation in fractures. Structural and seismic stratigraphic interpretation of the reflection profile shows that Neogene to recent tectonic deformation on this segment of the plate boundary concentrated on the southern side of the GF, that is, the Africa plate. info:eu-repo/semantics/publishedVersion Article in Journal/Newspaper North Atlantic Northeast Atlantic Instituto Politécnico de Lisboa: Repositório Científico do IPL Geophysical Journal International 209 2 713 729 |
institution |
Open Polar |
collection |
Instituto Politécnico de Lisboa: Repositório Científico do IPL |
op_collection_id |
ftinstplisboa |
language |
English |
topic |
Composition of the oceanic crust Transform faults Oceanic transform and fracture zone processes Crustal structure Atlantic Ocean Composição da crosta oceânica Transformar falhas Estrutura crustal |
spellingShingle |
Composition of the oceanic crust Transform faults Oceanic transform and fracture zone processes Crustal structure Atlantic Ocean Composição da crosta oceânica Transformar falhas Estrutura crustal Batista, Luís Hubscher, Christian Terrinha, Pedro Matias, Luís Afilhado, Alexandra Ludmann, Thomas Crustal structure of the Eurasia-Africa plate boundary across the Gloria Fault, North Atlantic Ocean |
topic_facet |
Composition of the oceanic crust Transform faults Oceanic transform and fracture zone processes Crustal structure Atlantic Ocean Composição da crosta oceânica Transformar falhas Estrutura crustal |
description |
The oceanic crustal and uppermost lithospheric mantle structure across the Gloria Fault (GF) transcurrent plate boundary between Africa and Eurasia in the Northeast Atlantic is investigated based on seismic reflection, seismic refraction and wide-angle reflection data. This experiment used 18 ocean bottom stations along an N-S 150 km long traverse together with acquisition of a multichannel seismic reflection profile. Modeling of P and S seismic waves and gravimetric anomalies allowed estimation of P- and S-wave velocities, density, Poisson's ratio and discussion of a compositional model. A five-layer model is proposed in which layers 1-3 correspond to normal sediments through typical oceanic crust layers 2 and 3. Layer 5 yielded mantle velocities above 7.9 km s(-1). Layer 4 with 4 km of thickness has Vp velocities between 7.1 and 7.4 km s(-1) and is clearly separated from typical oceanic crust and mantle layers. Comparison with natural analogues and published lab measurements suggest that layer 4 can be a mix of lithologies that comply with the estimated P and S velocities and computed Poisson's ratio and densities, such as, olivine cumulates, peridotite, gabbro and hydrated mantle. We favour the tectonic process that produces secondary porosity from which results serpentinization due to sea water circulation in fractures. Structural and seismic stratigraphic interpretation of the reflection profile shows that Neogene to recent tectonic deformation on this segment of the plate boundary concentrated on the southern side of the GF, that is, the Africa plate. info:eu-repo/semantics/publishedVersion |
format |
Article in Journal/Newspaper |
author |
Batista, Luís Hubscher, Christian Terrinha, Pedro Matias, Luís Afilhado, Alexandra Ludmann, Thomas |
author_facet |
Batista, Luís Hubscher, Christian Terrinha, Pedro Matias, Luís Afilhado, Alexandra Ludmann, Thomas |
author_sort |
Batista, Luís |
title |
Crustal structure of the Eurasia-Africa plate boundary across the Gloria Fault, North Atlantic Ocean |
title_short |
Crustal structure of the Eurasia-Africa plate boundary across the Gloria Fault, North Atlantic Ocean |
title_full |
Crustal structure of the Eurasia-Africa plate boundary across the Gloria Fault, North Atlantic Ocean |
title_fullStr |
Crustal structure of the Eurasia-Africa plate boundary across the Gloria Fault, North Atlantic Ocean |
title_full_unstemmed |
Crustal structure of the Eurasia-Africa plate boundary across the Gloria Fault, North Atlantic Ocean |
title_sort |
crustal structure of the eurasia-africa plate boundary across the gloria fault, north atlantic ocean |
publisher |
Oxford University Press |
publishDate |
2017 |
url |
http://hdl.handle.net/10400.21/9775 https://doi.org/10.1093/gji/ggx050 |
genre |
North Atlantic Northeast Atlantic |
genre_facet |
North Atlantic Northeast Atlantic |
op_relation |
Hu698/19-1 - German Research Foundation (DFG) info:eu-repo/grantAgreement/FCT/SFRH/SFRH%2FBD%2F81351%2F2011/PT https://watermark.silverchair.com/ggx050.pdf?token=AQECAHi208BE49Ooan9kkhW_Ercy7Dm3ZL_9Cf3qfKAc485ysgAAAlMwggJPBgkqhkiG9w0BBwagggJAMIICPAIBADCCAjUGCSqGSIb3DQEHATAeBglghkgBZQMEAS4wEQQM8vJ1QLWybDuwxgPOAgEQgIICBrihZLhewTwd4q33ncit2CwkJt3hzE3xKRfLcUl6Vp9OCeZ-Xi1P3Dw_N-SS6b9gz9WVoWbSL4fQ8JAl3QAL-3N9gx3RhEbbXoXWid2fCz7SKUzkY_cftfMHbpGIjyZep1LjcC8oF1ZdT7LXAmQNJ1fX6Z1gYrOmPkhoarEX43E4ADb1Z0775KMPBPlPSlpp0t2mNSAZl_RWd2BOKNyq7IUR487odwAbQrdlIfKObk8J3r5q_mdLBYUIgZ4G2mTwnf7EQapLXlbXucXVO3z5d8FDujiX4aJbfsGyAeKg1T_jKZ5jJtbBm9r4CjaVv4ZiJaTH5VBtG-Y3St3rS7ALk-o3BwJk5VBOLbyn8U2jah8fA0d7vSjggMgRPcwzTU_bmeb4KtmH9O586Y5NAE0y2_H_IU4-0iPQo0v8g_juxxYp3vZ4mUH0Y3_9VzIeGQJD9qGspqTLvnsJJzZa-Fp3UpmVWMTl-486kSWOq7zYZ0tOsPJON4XuafhWYWb-kifU7h22PKg1GqwfXzPWoojHgSIPavzs5RkyMd6eGGmrU8F-Nyi5mNi9dN5kHd_VZNY9lpzULE3vdtFfI7CcpyZ-Hp40-McKCvZ6K4ZxumYIpFX_vOqHnRIy7-UAmA_ZsBwcYvxcEm76rwUGwsIVIwqqvveATO-Ojj0dWv0s9jGUntyc60B9pqOf BATISTA, Luís; [et al] – Crustal structure of the Eurasia-Africa plate boundary across the Gloria Fault, North Atlantic Ocean. Geophysical Journal International. ISSN 0956-540X. Vol. 209, N.º 2 (2017), pp. 713-729 0956-540X 1365-246X http://hdl.handle.net/10400.21/9775 doi:10.1093/gji/ggx050 |
op_rights |
closedAccess |
op_doi |
https://doi.org/10.1093/gji/ggx050 |
container_title |
Geophysical Journal International |
container_volume |
209 |
container_issue |
2 |
container_start_page |
713 |
op_container_end_page |
729 |
_version_ |
1766134831404548096 |