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A New Tectonic Model Between the Madagascar Ridge and Del Cano Rise in the Indian Ocean
The southern Indian Ocean has several prominent aseismic ridges recognized as oceanic large igneous provinces (i.e., the Madagascar Ridge, Del Cano Rise, Crozet Plateau, and Conrad Rise) in the off‐axis areas of the Southwest Indian Ridge (SWIR). However, previously obtained magnetic survey lines ar...
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Published in: | Journal of geophysical research. Solid earth 2022-01, Vol.127 (1), p.n/a |
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description | The southern Indian Ocean has several prominent aseismic ridges recognized as oceanic large igneous provinces (i.e., the Madagascar Ridge, Del Cano Rise, Crozet Plateau, and Conrad Rise) in the off‐axis areas of the Southwest Indian Ridge (SWIR). However, previously obtained magnetic survey lines are sparse and not correctly aligned with the seafloor spreading direction; thus, the detailed spreading history, including the formation of these aseismic ridges, remains an open question. We reconstructed the tectonic history of two segments between the Discovery II and Gallieni fracture zones in the SWIR using newly obtained magnetic data (total and vector magnetic field) and an open‐source magnetic data set. We revealed that the southern Madagascar Ridge and the Del Cano Rise once formed a single bathymetric high and separated by at least Chron 30y, which is quite different from the global age model. In addition, the rises may have formed before Chron 34y, assuming an extinct ridge south of the Del Cano Rise. The two rises have been recognized as having formed by Marion hotspot plume‐induced excess volcanism around the active spreading ridge of the SWIR, which can explain locally isostatically compensated thicker‐than‐normal crust. However, linear magnetic anomalies have not been observed across the main part of these rises, suggesting that magmatic activity controlled by seafloor spreading is unlikely. Like other aseismic ridges in the southern Indian Ocean, these two rises may possibly have been formed partly by continental fragments rather than plume‐induced excess volcanism.
Plain Language Summary
The southern Indian Ocean contains several bathymetric high regions previously interpreted as oceanic large igneous provinces. Hotspot‐ridge interaction is considered as the key factor in the formation of such large volcanic structures. However, the detailed seafloor spreading history and origin of these large volcanic structures are not understood as well as those in other oceans because of the vast and remote Indian Ocean. We conducted magnetic surveys and reconstructed a new tectonic history of two segments along the Southwest Indian Ridge (SWIR). We found that the southern Madagascar Ridge and the Del Cano Rise once formed a single bathymetric high and that they separated by at least 66 million years ago. Moreover, the rises may have formed before 84 million years ago, assuming an extinct ridge south of the Del Cano Rise. The two rises might have formed by in |
doi_str_mv | 10.1029/2021JB021743 |
format | article |
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Plain Language Summary
The southern Indian Ocean contains several bathymetric high regions previously interpreted as oceanic large igneous provinces. Hotspot‐ridge interaction is considered as the key factor in the formation of such large volcanic structures. However, the detailed seafloor spreading history and origin of these large volcanic structures are not understood as well as those in other oceans because of the vast and remote Indian Ocean. We conducted magnetic surveys and reconstructed a new tectonic history of two segments along the Southwest Indian Ridge (SWIR). We found that the southern Madagascar Ridge and the Del Cano Rise once formed a single bathymetric high and that they separated by at least 66 million years ago. Moreover, the rises may have formed before 84 million years ago, assuming an extinct ridge south of the Del Cano Rise. The two rises might have formed by interaction between the Marion hotspot and SWIR; however, linear magnetic anomalies implying seafloor spreading are not observed in the main parts of these rises. This absence suggests that hotspot‐ridge interaction cannot fully explain the origin of these rises. We cannot exclude the possibility that the two rises are partly continental fragments rather than products of hotspot‐induced excess volcanism.
Key Points
Revised seafloor ages up to Chron 31 in the Indian Ocean are obtained by new total and vector magnetic data
Our new tectonic scenario indicates that the Madagascar Plateau and Del Cano Rise once formed a single bathymetric high
The tectonics of oceanic plateaus in the Indian Ocean need to be reexamined, including continental fragment origin</description><identifier>ISSN: 2169-9313</identifier><identifier>EISSN: 2169-9356</identifier><identifier>DOI: 10.1029/2021JB021743</identifier><language>eng</language><publisher>Washington: Blackwell Publishing Ltd</publisher><subject>Aseismic ridges ; Bathymetry ; breakup ; Del Cano Rise ; Fracture zones ; Fragments ; Geophysics ; Hot spots ; Hot spots (geology) ; large igneous provinces ; Lava ; Madagascar Ridge ; Magnetic anomalies ; magnetic anomaly ; Magnetic data ; Magnetic field ; Magnetic fields ; Magnetic surveys ; Marion hotspot ; Ocean floor ; Oceanic crust ; oceanic plateaus ; Oceans ; Ridges ; Sea floor spreading ; Seafloor spreading ; Segments ; Southwest Indian Ridge ; Spreading ; Surveying ; Surveys ; Tectonics ; Volcanic activity ; Volcanic ash ; Volcanism</subject><ispartof>Journal of geophysical research. Solid earth, 2022-01, Vol.127 (1), p.n/a</ispartof><rights>2022. The Authors.</rights><rights>2022. This article is published under http://creativecommons.org/licenses/by/4.0/ (the “License”). Notwithstanding the ProQuest Terms and Conditions, you may use this content in accordance with the terms of the License.</rights><lds50>peer_reviewed</lds50><oa>free_for_read</oa><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-a4342-499fc1974b2b5a9f9ad27dfc480b3d9cb5d0bed9ee188d4f3ddbc90bdc926a333</citedby><cites>FETCH-LOGICAL-a4342-499fc1974b2b5a9f9ad27dfc480b3d9cb5d0bed9ee188d4f3ddbc90bdc926a333</cites><orcidid>0000-0003-1132-9795 ; 0000-0001-8457-4244 ; 0000-0003-0527-1742 ; 0000-0002-2158-3730</orcidid></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><link.rule.ids>314,780,784,27924,27925</link.rule.ids></links><search><creatorcontrib>Sato, Taichi</creatorcontrib><creatorcontrib>Nogi, Yoshifumi</creatorcontrib><creatorcontrib>Sato, Hiroshi</creatorcontrib><creatorcontrib>Fujii, Masakazu</creatorcontrib><title>A New Tectonic Model Between the Madagascar Ridge and Del Cano Rise in the Indian Ocean</title><title>Journal of geophysical research. Solid earth</title><description>The southern Indian Ocean has several prominent aseismic ridges recognized as oceanic large igneous provinces (i.e., the Madagascar Ridge, Del Cano Rise, Crozet Plateau, and Conrad Rise) in the off‐axis areas of the Southwest Indian Ridge (SWIR). However, previously obtained magnetic survey lines are sparse and not correctly aligned with the seafloor spreading direction; thus, the detailed spreading history, including the formation of these aseismic ridges, remains an open question. We reconstructed the tectonic history of two segments between the Discovery II and Gallieni fracture zones in the SWIR using newly obtained magnetic data (total and vector magnetic field) and an open‐source magnetic data set. We revealed that the southern Madagascar Ridge and the Del Cano Rise once formed a single bathymetric high and separated by at least Chron 30y, which is quite different from the global age model. In addition, the rises may have formed before Chron 34y, assuming an extinct ridge south of the Del Cano Rise. The two rises have been recognized as having formed by Marion hotspot plume‐induced excess volcanism around the active spreading ridge of the SWIR, which can explain locally isostatically compensated thicker‐than‐normal crust. However, linear magnetic anomalies have not been observed across the main part of these rises, suggesting that magmatic activity controlled by seafloor spreading is unlikely. Like other aseismic ridges in the southern Indian Ocean, these two rises may possibly have been formed partly by continental fragments rather than plume‐induced excess volcanism.
Plain Language Summary
The southern Indian Ocean contains several bathymetric high regions previously interpreted as oceanic large igneous provinces. Hotspot‐ridge interaction is considered as the key factor in the formation of such large volcanic structures. However, the detailed seafloor spreading history and origin of these large volcanic structures are not understood as well as those in other oceans because of the vast and remote Indian Ocean. We conducted magnetic surveys and reconstructed a new tectonic history of two segments along the Southwest Indian Ridge (SWIR). We found that the southern Madagascar Ridge and the Del Cano Rise once formed a single bathymetric high and that they separated by at least 66 million years ago. Moreover, the rises may have formed before 84 million years ago, assuming an extinct ridge south of the Del Cano Rise. The two rises might have formed by interaction between the Marion hotspot and SWIR; however, linear magnetic anomalies implying seafloor spreading are not observed in the main parts of these rises. This absence suggests that hotspot‐ridge interaction cannot fully explain the origin of these rises. We cannot exclude the possibility that the two rises are partly continental fragments rather than products of hotspot‐induced excess volcanism.
Key Points
Revised seafloor ages up to Chron 31 in the Indian Ocean are obtained by new total and vector magnetic data
Our new tectonic scenario indicates that the Madagascar Plateau and Del Cano Rise once formed a single bathymetric high
The tectonics of oceanic plateaus in the Indian Ocean need to be reexamined, including continental fragment origin</description><subject>Aseismic ridges</subject><subject>Bathymetry</subject><subject>breakup</subject><subject>Del Cano Rise</subject><subject>Fracture zones</subject><subject>Fragments</subject><subject>Geophysics</subject><subject>Hot spots</subject><subject>Hot spots (geology)</subject><subject>large igneous provinces</subject><subject>Lava</subject><subject>Madagascar Ridge</subject><subject>Magnetic anomalies</subject><subject>magnetic anomaly</subject><subject>Magnetic data</subject><subject>Magnetic field</subject><subject>Magnetic fields</subject><subject>Magnetic surveys</subject><subject>Marion hotspot</subject><subject>Ocean floor</subject><subject>Oceanic crust</subject><subject>oceanic plateaus</subject><subject>Oceans</subject><subject>Ridges</subject><subject>Sea floor spreading</subject><subject>Seafloor spreading</subject><subject>Segments</subject><subject>Southwest Indian Ridge</subject><subject>Spreading</subject><subject>Surveying</subject><subject>Surveys</subject><subject>Tectonics</subject><subject>Volcanic activity</subject><subject>Volcanic ash</subject><subject>Volcanism</subject><issn>2169-9313</issn><issn>2169-9356</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2022</creationdate><recordtype>article</recordtype><sourceid>24P</sourceid><recordid>eNp90EtLAzEQAOAgCpbamz8g4NXVvPaRY1u1trQWSsVjyGO2bqnZutlS-u-NrIgn5zAzDB8zMAhdU3JHCZP3jDA6G8WUC36GeoxmMpE8zc5_e8ov0SCELYlRxBEVPfQ2xC9wxGuwbe0rixe1gx0eQXsE8Lh9B7zQTm90sLrBq8ptAGvv8ENEY-3rOAqAq05Ovau0x0sL2l-hi1LvAgx-ah-9Pj2ux8_JfDmZjofzRAsuWCKkLC2VuTDMpFqWUjuWu9KKghjupDWpIwacBKBF4UTJnTNWEuOsZJnmnPfRTbd339SfBwit2taHxseTimWMyTxLCxHVbadsU4fQQKn2TfWhm5OiRH1_T_39XuS848dqB6d_rZpNVqM0FYTxL8l4bp4</recordid><startdate>202201</startdate><enddate>202201</enddate><creator>Sato, Taichi</creator><creator>Nogi, Yoshifumi</creator><creator>Sato, Hiroshi</creator><creator>Fujii, Masakazu</creator><general>Blackwell Publishing Ltd</general><scope>24P</scope><scope>WIN</scope><scope>AAYXX</scope><scope>CITATION</scope><scope>7ST</scope><scope>7TG</scope><scope>8FD</scope><scope>C1K</scope><scope>F1W</scope><scope>FR3</scope><scope>H8D</scope><scope>H96</scope><scope>KL.</scope><scope>KR7</scope><scope>L.G</scope><scope>L7M</scope><scope>SOI</scope><orcidid>https://orcid.org/0000-0003-1132-9795</orcidid><orcidid>https://orcid.org/0000-0001-8457-4244</orcidid><orcidid>https://orcid.org/0000-0003-0527-1742</orcidid><orcidid>https://orcid.org/0000-0002-2158-3730</orcidid></search><sort><creationdate>202201</creationdate><title>A New Tectonic Model Between the Madagascar Ridge and Del Cano Rise in the Indian Ocean</title><author>Sato, Taichi ; Nogi, Yoshifumi ; Sato, Hiroshi ; Fujii, Masakazu</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-a4342-499fc1974b2b5a9f9ad27dfc480b3d9cb5d0bed9ee188d4f3ddbc90bdc926a333</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2022</creationdate><topic>Aseismic ridges</topic><topic>Bathymetry</topic><topic>breakup</topic><topic>Del Cano Rise</topic><topic>Fracture zones</topic><topic>Fragments</topic><topic>Geophysics</topic><topic>Hot spots</topic><topic>Hot spots (geology)</topic><topic>large igneous provinces</topic><topic>Lava</topic><topic>Madagascar Ridge</topic><topic>Magnetic anomalies</topic><topic>magnetic anomaly</topic><topic>Magnetic data</topic><topic>Magnetic field</topic><topic>Magnetic fields</topic><topic>Magnetic surveys</topic><topic>Marion hotspot</topic><topic>Ocean floor</topic><topic>Oceanic crust</topic><topic>oceanic plateaus</topic><topic>Oceans</topic><topic>Ridges</topic><topic>Sea floor spreading</topic><topic>Seafloor spreading</topic><topic>Segments</topic><topic>Southwest Indian Ridge</topic><topic>Spreading</topic><topic>Surveying</topic><topic>Surveys</topic><topic>Tectonics</topic><topic>Volcanic activity</topic><topic>Volcanic ash</topic><topic>Volcanism</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Sato, Taichi</creatorcontrib><creatorcontrib>Nogi, Yoshifumi</creatorcontrib><creatorcontrib>Sato, Hiroshi</creatorcontrib><creatorcontrib>Fujii, Masakazu</creatorcontrib><collection>Wiley Online Library (Open Access Collection)</collection><collection>Wiley Online Library Free Content</collection><collection>CrossRef</collection><collection>Environment Abstracts</collection><collection>Meteorological & Geoastrophysical Abstracts</collection><collection>Technology Research Database</collection><collection>Environmental Sciences and Pollution Management</collection><collection>ASFA: Aquatic Sciences and Fisheries Abstracts</collection><collection>Engineering Research Database</collection><collection>Aerospace Database</collection><collection>Aquatic Science & Fisheries Abstracts (ASFA) 2: Ocean Technology, Policy & Non-Living Resources</collection><collection>Meteorological & Geoastrophysical Abstracts - Academic</collection><collection>Civil Engineering Abstracts</collection><collection>Aquatic Science & Fisheries Abstracts (ASFA) Professional</collection><collection>Advanced Technologies Database with Aerospace</collection><collection>Environment Abstracts</collection><jtitle>Journal of geophysical research. Solid earth</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Sato, Taichi</au><au>Nogi, Yoshifumi</au><au>Sato, Hiroshi</au><au>Fujii, Masakazu</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>A New Tectonic Model Between the Madagascar Ridge and Del Cano Rise in the Indian Ocean</atitle><jtitle>Journal of geophysical research. Solid earth</jtitle><date>2022-01</date><risdate>2022</risdate><volume>127</volume><issue>1</issue><epage>n/a</epage><issn>2169-9313</issn><eissn>2169-9356</eissn><abstract>The southern Indian Ocean has several prominent aseismic ridges recognized as oceanic large igneous provinces (i.e., the Madagascar Ridge, Del Cano Rise, Crozet Plateau, and Conrad Rise) in the off‐axis areas of the Southwest Indian Ridge (SWIR). However, previously obtained magnetic survey lines are sparse and not correctly aligned with the seafloor spreading direction; thus, the detailed spreading history, including the formation of these aseismic ridges, remains an open question. We reconstructed the tectonic history of two segments between the Discovery II and Gallieni fracture zones in the SWIR using newly obtained magnetic data (total and vector magnetic field) and an open‐source magnetic data set. We revealed that the southern Madagascar Ridge and the Del Cano Rise once formed a single bathymetric high and separated by at least Chron 30y, which is quite different from the global age model. In addition, the rises may have formed before Chron 34y, assuming an extinct ridge south of the Del Cano Rise. The two rises have been recognized as having formed by Marion hotspot plume‐induced excess volcanism around the active spreading ridge of the SWIR, which can explain locally isostatically compensated thicker‐than‐normal crust. However, linear magnetic anomalies have not been observed across the main part of these rises, suggesting that magmatic activity controlled by seafloor spreading is unlikely. Like other aseismic ridges in the southern Indian Ocean, these two rises may possibly have been formed partly by continental fragments rather than plume‐induced excess volcanism.
Plain Language Summary
The southern Indian Ocean contains several bathymetric high regions previously interpreted as oceanic large igneous provinces. Hotspot‐ridge interaction is considered as the key factor in the formation of such large volcanic structures. However, the detailed seafloor spreading history and origin of these large volcanic structures are not understood as well as those in other oceans because of the vast and remote Indian Ocean. We conducted magnetic surveys and reconstructed a new tectonic history of two segments along the Southwest Indian Ridge (SWIR). We found that the southern Madagascar Ridge and the Del Cano Rise once formed a single bathymetric high and that they separated by at least 66 million years ago. Moreover, the rises may have formed before 84 million years ago, assuming an extinct ridge south of the Del Cano Rise. The two rises might have formed by interaction between the Marion hotspot and SWIR; however, linear magnetic anomalies implying seafloor spreading are not observed in the main parts of these rises. This absence suggests that hotspot‐ridge interaction cannot fully explain the origin of these rises. We cannot exclude the possibility that the two rises are partly continental fragments rather than products of hotspot‐induced excess volcanism.
Key Points
Revised seafloor ages up to Chron 31 in the Indian Ocean are obtained by new total and vector magnetic data
Our new tectonic scenario indicates that the Madagascar Plateau and Del Cano Rise once formed a single bathymetric high
The tectonics of oceanic plateaus in the Indian Ocean need to be reexamined, including continental fragment origin</abstract><cop>Washington</cop><pub>Blackwell Publishing Ltd</pub><doi>10.1029/2021JB021743</doi><tpages>15</tpages><orcidid>https://orcid.org/0000-0003-1132-9795</orcidid><orcidid>https://orcid.org/0000-0001-8457-4244</orcidid><orcidid>https://orcid.org/0000-0003-0527-1742</orcidid><orcidid>https://orcid.org/0000-0002-2158-3730</orcidid><oa>free_for_read</oa></addata></record> |
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subjects | Aseismic ridges Bathymetry breakup Del Cano Rise Fracture zones Fragments Geophysics Hot spots Hot spots (geology) large igneous provinces Lava Madagascar Ridge Magnetic anomalies magnetic anomaly Magnetic data Magnetic field Magnetic fields Magnetic surveys Marion hotspot Ocean floor Oceanic crust oceanic plateaus Oceans Ridges Sea floor spreading Seafloor spreading Segments Southwest Indian Ridge Spreading Surveying Surveys Tectonics Volcanic activity Volcanic ash Volcanism |
title | A New Tectonic Model Between the Madagascar Ridge and Del Cano Rise in the Indian Ocean |
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