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Assessing the conditions of continental breakup at magma-poor rifted margins: What can we learn from slow spreading mid-ocean ridges?

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Title: Assessing the conditions of continental breakup at magma-poor rifted margins: What can we learn from slow spreading mid-ocean ridges?
Alternate Title: Processus d’océanisation dans les marges continentales pauvres en magma : que pouvons-nous apprendre de l’étude des dorsales lentes ?
Authors: Cannat, Mathilde1 cannat@ipgp.jussieu.fr, Manatschal, Gianreto2, Sauter, Daniel2, Péron-Pinvidic, Gwenn2
Source: Comptes Rendus Géoscience. May2009, Vol. 341 Issue 5, p406-427. 22p.
Subjects: Continental margins, Magmas, Rifts (Geology), Sea-floor spreading, Mid-ocean ridges, Demographic transition, Glacial drift
Abstract (English): Abstract: We propose a review of the tectonic, magmatic and hydrothermal evolution of slow spreading ridges, focusing on concepts which we think are most relevant to discuss the rift to drift transition at magma-poor ocean–continent transitions (OCTs). Based on this review, we emphasize the importance of the thermal regime as a key parameter and we propose that the thermal regime of magma-poor OCTs evolves in the following principal phases: the onset of decompression mantle melting, the onset of localized plate divergence, the installation of a ridge-type thermal regime (active heat balance, no inheritance), which we argue is the most practical definition for continental breakup, and, possibly, the onset of ridge-type, focused mantle upwelling. We propose this phased evolution as a framework in which to develop further research, combining our understanding of rifting and seafloor spreading, in order to better quantify the processes that control continental breakup. [Copyright &y& Elsevier]
Abstract (French): Résumé: Nous présentons une revue sur l’évolution tectonique, magmatique et hydrothermale des dorsales lentes, en privilégiant les concepts qui nous paraissent les plus à même d’éclairer une discussion de la transition rifting–accrétion océanique dans les marges continentales pauvres en magma. Sur la base de cette revue, nous insistons sur le rôle du régime thermique et nous proposons que le régime thermique des transitions océan–continent (TOC) dans les marges peu magmatiques évolue selon les étapes suivantes : début de la fusion du manteau par décompression, localisation de la divergence des plaques, installation d’un régime thermique de type dorsale (c’est-à-dire contrôlé par l’équilibre actif entre apports de chaleur et refroidissement, sans héritage). Nous proposons que cette troisième étape correspond à la définition la plus appropriée de l’océanisation. Une quatrième étape pourrait être le début d’un flux asthénosphérique focalisé, tel qu’il existe probablement sous les dorsales lentes. Nous proposons cette évolution par étapes comme un cadre pour approfondir l’étude des processus d’océanisation, en combinant les connaissances sur les rifts et sur les dorsales.
Copyright of Comptes Rendus Géoscience is the property of Academie des Science, Centre Mersenne and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
Database: Engineering Source
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PubType: Academic Journal
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  Data: Assessing the conditions of continental breakup at magma-poor rifted margins: What can we learn from slow spreading mid-ocean ridges?
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  Data: Processus d’océanisation dans les marges continentales pauvres en magma : que pouvons-nous apprendre de l’étude des dorsales lentes ?
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  Data: <searchLink fieldCode="DE" term="%22Continental+margins%22">Continental margins</searchLink><br /><searchLink fieldCode="DE" term="%22Magmas%22">Magmas</searchLink><br /><searchLink fieldCode="DE" term="%22Rifts+%28Geology%29%22">Rifts (Geology)</searchLink><br /><searchLink fieldCode="DE" term="%22Sea-floor+spreading%22">Sea-floor spreading</searchLink><br /><searchLink fieldCode="DE" term="%22Mid-ocean+ridges%22">Mid-ocean ridges</searchLink><br /><searchLink fieldCode="DE" term="%22Demographic+transition%22">Demographic transition</searchLink><br /><searchLink fieldCode="DE" term="%22Glacial+drift%22">Glacial drift</searchLink>
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  Data: Abstract: We propose a review of the tectonic, magmatic and hydrothermal evolution of slow spreading ridges, focusing on concepts which we think are most relevant to discuss the rift to drift transition at magma-poor ocean–continent transitions (OCTs). Based on this review, we emphasize the importance of the thermal regime as a key parameter and we propose that the thermal regime of magma-poor OCTs evolves in the following principal phases: the onset of decompression mantle melting, the onset of localized plate divergence, the installation of a ridge-type thermal regime (active heat balance, no inheritance), which we argue is the most practical definition for continental breakup, and, possibly, the onset of ridge-type, focused mantle upwelling. We propose this phased evolution as a framework in which to develop further research, combining our understanding of rifting and seafloor spreading, in order to better quantify the processes that control continental breakup. [Copyright &y& Elsevier]
– Name: Abstract
  Label: Abstract (French)
  Group: Ab
  Data: Résumé: Nous présentons une revue sur l’évolution tectonique, magmatique et hydrothermale des dorsales lentes, en privilégiant les concepts qui nous paraissent les plus à même d’éclairer une discussion de la transition rifting–accrétion océanique dans les marges continentales pauvres en magma. Sur la base de cette revue, nous insistons sur le rôle du régime thermique et nous proposons que le régime thermique des transitions océan–continent (TOC) dans les marges peu magmatiques évolue selon les étapes suivantes : début de la fusion du manteau par décompression, localisation de la divergence des plaques, installation d’un régime thermique de type dorsale (c’est-à-dire contrôlé par l’équilibre actif entre apports de chaleur et refroidissement, sans héritage). Nous proposons que cette troisième étape correspond à la définition la plus appropriée de l’océanisation. Une quatrième étape pourrait être le début d’un flux asthénosphérique focalisé, tel qu’il existe probablement sous les dorsales lentes. Nous proposons cette évolution par étapes comme un cadre pour approfondir l’étude des processus d’océanisation, en combinant les connaissances sur les rifts et sur les dorsales. </ce:abst [Copyright 2009 Elsevier]
– Name: AbstractSuppliedCopyright
  Label:
  Group: Ab
  Data: <i>Copyright of Comptes Rendus Géoscience is the property of Academie des Science, Centre Mersenne and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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      – Type: doi
        Value: 10.1016/j.crte.2009.01.005
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      – Code: eng
        Text: English
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      Pagination:
        PageCount: 22
        StartPage: 406
    Subjects:
      – SubjectFull: Continental margins
        Type: general
      – SubjectFull: Magmas
        Type: general
      – SubjectFull: Rifts (Geology)
        Type: general
      – SubjectFull: Sea-floor spreading
        Type: general
      – SubjectFull: Mid-ocean ridges
        Type: general
      – SubjectFull: Demographic transition
        Type: general
      – SubjectFull: Glacial drift
        Type: general
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      – TitleFull: Assessing the conditions of continental breakup at magma-poor rifted margins: What can we learn from slow spreading mid-ocean ridges?
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            NameFull: Cannat, Mathilde
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            NameFull: Manatschal, Gianreto
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            NameFull: Sauter, Daniel
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            NameFull: Péron-Pinvidic, Gwenn
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              M: 05
              Text: May2009
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