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Oceanic corrugated surfaces and the strength of the axial lithosphere at slow spreading ridges

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Title: Oceanic corrugated surfaces and the strength of the axial lithosphere at slow spreading ridges
Authors: Cannat, Mathilde1 cannat@ipgp.jussieu.fr, Sauter, Daniel2, Escartín, Javier1, Lavier, Luc3, Picazo, Suzanne1
Source: Earth & Planetary Science Letters. Oct2009, Vol. 288 Issue 1/2, p174-183. 10p.
Subjects: Mid-ocean ridges, Gravity, Geologic faults, Plate tectonics, Shear zones, Igneous intrusions, Crust of the earth, Earth's mantle, Earth (Planet)
Abstract: Abstract: We analyse the topography and gravity signature of 39 corrugated surfaces formed over the past 26myrs in the footwall of axial detachment faults at the eastern Southwest Indian Ridge. These corrugated surfaces appear to have formed at a melt supply about half the global melt supply average for mid-ocean ridges, and we find that their presently elevated topography, relative to adjacent non-corrugated seafloor, was mostly acquired at the end of their formation, at the “termination stage”. This configuration, which also characterizes many off-axis corrugated surfaces in other oceans, suggests that the plate flexural rigidity was very low during the formation of the corrugated surface, and increased significantly at the termination stage. Following Buck (1988), we hypothesize that stresses related to bending of the plate cause internal deformation and damage in the footwall of the fault, which is associated with weakening. As a possible mechanism for enhanced footwall weakening while corrugated surfaces form, we propose the formation of weak shear zones coated with hydrous minerals such as talc, amphibole, chlorite and serpentine, in mantle-derived ultramafics next to gabbro intrusions. If this hypothesis is correct, the amount of footwall weakening and roll-over along axial detachment faults at slow spreading ridges may be controlled both by access to hydrothermal fluids in the footwall of the detachment, and by the abundance and distribution of gabbros intrusions in exhumed ultramafics. [Copyright &y& Elsevier]
Copyright of Earth & Planetary Science Letters is the property of Elsevier B.V. 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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DbLabel: Engineering Source
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  Data: Oceanic corrugated surfaces and the strength of the axial lithosphere at slow spreading ridges
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  Data: <searchLink fieldCode="DE" term="%22Mid-ocean+ridges%22">Mid-ocean ridges</searchLink><br /><searchLink fieldCode="DE" term="%22Gravity%22">Gravity</searchLink><br /><searchLink fieldCode="DE" term="%22Geologic+faults%22">Geologic faults</searchLink><br /><searchLink fieldCode="DE" term="%22Plate+tectonics%22">Plate tectonics</searchLink><br /><searchLink fieldCode="DE" term="%22Shear+zones%22">Shear zones</searchLink><br /><searchLink fieldCode="DE" term="%22Igneous+intrusions%22">Igneous intrusions</searchLink><br /><searchLink fieldCode="DE" term="%22Crust+of+the+earth%22">Crust of the earth</searchLink><br /><searchLink fieldCode="DE" term="%22Earth's+mantle%22">Earth's mantle</searchLink><br /><searchLink fieldCode="DE" term="%22Earth+%28Planet%29%22">Earth (Planet)</searchLink>
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  Data: Abstract: We analyse the topography and gravity signature of 39 corrugated surfaces formed over the past 26myrs in the footwall of axial detachment faults at the eastern Southwest Indian Ridge. These corrugated surfaces appear to have formed at a melt supply about half the global melt supply average for mid-ocean ridges, and we find that their presently elevated topography, relative to adjacent non-corrugated seafloor, was mostly acquired at the end of their formation, at the “termination stage”. This configuration, which also characterizes many off-axis corrugated surfaces in other oceans, suggests that the plate flexural rigidity was very low during the formation of the corrugated surface, and increased significantly at the termination stage. Following Buck (1988), we hypothesize that stresses related to bending of the plate cause internal deformation and damage in the footwall of the fault, which is associated with weakening. As a possible mechanism for enhanced footwall weakening while corrugated surfaces form, we propose the formation of weak shear zones coated with hydrous minerals such as talc, amphibole, chlorite and serpentine, in mantle-derived ultramafics next to gabbro intrusions. If this hypothesis is correct, the amount of footwall weakening and roll-over along axial detachment faults at slow spreading ridges may be controlled both by access to hydrothermal fluids in the footwall of the detachment, and by the abundance and distribution of gabbros intrusions in exhumed ultramafics. [Copyright &y& Elsevier]
– Name: AbstractSuppliedCopyright
  Label:
  Group: Ab
  Data: <i>Copyright of Earth & Planetary Science Letters is the property of Elsevier B.V. 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.epsl.2009.09.020
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        Text: English
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      – SubjectFull: Mid-ocean ridges
        Type: general
      – SubjectFull: Gravity
        Type: general
      – SubjectFull: Geologic faults
        Type: general
      – SubjectFull: Plate tectonics
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      – SubjectFull: Shear zones
        Type: general
      – SubjectFull: Igneous intrusions
        Type: general
      – SubjectFull: Crust of the earth
        Type: general
      – SubjectFull: Earth's mantle
        Type: general
      – SubjectFull: Earth (Planet)
        Type: general
    Titles:
      – TitleFull: Oceanic corrugated surfaces and the strength of the axial lithosphere at slow spreading ridges
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            NameFull: Cannat, Mathilde
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            NameFull: Escartín, Javier
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            NameFull: Lavier, Luc
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              Text: Oct2009
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              Y: 2009
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              Value: 288
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