Lower Crustal Strength Controls on Melting and Serpentinization at Magma‐Poor Margins: Potential Implications for the South Atlantic

Rifted continental margins may present a predominantly magmatic continent‐ocean transition (COT), or one characterized by large exposures of serpentinized mantle. In this study we use numerical modeling to show the importance of the lower crustal strength in controlling the amount and onset of melti...

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Bibliographic Details
Published in:Geochemistry, geophysics, geosystems : G3 geophysics, geosystems : G3, 2017-12, Vol.18 (12), p.4538-4557
Main Authors: Ros, Elena, Pérez‐Gussinyé, Marta, Araújo, Mario, Thoaldo Romeiro, Marco, Andrés‐Martínez, Miguel, Morgan, Jason P.
Format: Article
Language:English
Subjects:
Continental margins
continental rifting
Continental shelves
continent‐ocean transition
Fault lines
Faults
geodynamic modeling
Lava
Magma
magma‐poor margins of South Atlantic
Mantle
Melting
Modelling
Numerical experiments
Oceanic crust
Oceans
Rifting
Serpentinization
Strength
Subsidence
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Summary:Rifted continental margins may present a predominantly magmatic continent‐ocean transition (COT), or one characterized by large exposures of serpentinized mantle. In this study we use numerical modeling to show the importance of the lower crustal strength in controlling the amount and onset of melting and serpentinization during rifting. We propose that the relative timing between both events controls the nature of the COT. Numerical experiments for half‐extension velocities
ISSN:1525-2027
1525-2027
DOI:10.1002/2017GC007212