Gouiza, M orcid.org/0000-0001-5438-2698 and Paton, DA orcid.org/0000-0001-8918-6697 (2019) The role of inherited lithospheric heterogeneities in defining the crustal architecture of rifted margins and the magmatic budget during continental breakup. Geochemistry, Geophysics, Geosystems, 20 (4). pp. 1836-1853.
Abstract
During the final stage of continental rifting, stretching localizes in the future distal domain where lithospheric necking occurs resulting in continental breakup. In magma-poor margins, the lithospheric necking is accompanied by crustal hyperextension, serpentinization and exhumation of mantle lithosphere in the continent-ocean transition domain (COT). In magma-rich margins, the necking is accomplished by the emplacement of large amounts of volcanics in the COT, in the form of seaward dipping wedges of flood basalts (SDRs). This study examines the factors controlling the final crustal architecture observed in rifted margins and the magmatic budget during continental breakup, using observations from the Labrador Sea. The latter shows magma-rich breakup with SDRs documented in the north and magma-poor breakup with a wide domain of exhumed serpentinized mantle recorded in the south. The pre-rift strength of the lithosphere, defined by the inherited thermal structure, composition, and thickness of the lithospheric layers, controls the structural evolution during rifting. While variations in the magmatic budget associated with breakup are controlled primarily by the interaction between the pre-rift inheritance, the timing and the degree of mantle melting, in relation to lithospheric thinning and mantle hydration.
Metadata
Item Type: | Article |
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Authors/Creators: |
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Copyright, Publisher and Additional Information: | ©2019. American Geophysical Union. All Rights Reserved. This is the published version of the following article: Gouiza, M., & Paton, D. A. ( 2019). The role of inherited lithospheric heterogeneities in defining the crustal architecture of rifted margins and the magmatic budget during continental breakup. Geochemistry, Geophysics, Geosystems, which has been published in final form at https://doi.org/10.1029/2018GC007808. This article may be used for non-commercial purposes in accordance with Wiley Terms and Conditions for Self-Archiving. Uploaded in accordance with the publisher's self-archiving policy. |
Keywords: | continental rifting; Inheritance; lithosphere heterogeneity; Magma‐poor margin; hyperextension; Magma‐rich margin |
Dates: |
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Institution: | The University of Leeds |
Academic Units: | The University of Leeds > Faculty of Environment (Leeds) > School of Earth and Environment (Leeds) > Institute for Applied Geosciences (IAG) (Leeds) |
Funding Information: | Funder Grant number Saudi Aramco Not Known |
Depositing User: | Symplectic Publications |
Date Deposited: | 24 Apr 2019 13:37 |
Last Modified: | 01 Oct 2019 00:39 |
Status: | Published |
Publisher: | Wiley |
Identification Number: | 10.1029/2018GC007808 |
Open Archives Initiative ID (OAI ID): | oai:eprints.whiterose.ac.uk:144386 |