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Initiation of a Proto‐transform Fault Prior to Seafloor Spreading

Research output: Contribution to journalArticle

Original languageEnglish
Pages (from-to)4744-4756
Number of pages13
JournalGeochemistry, Geophysics, Geosystems
Volume19
Issue number12
DOIs
DateAccepted/In press - 3 Dec 2018
DatePublished (current) - 28 Dec 2018

Abstract

Transform faults are a fundamental tenet of plate tectonics, connecting offset extensional segments of mid‐ocean ridges in ocean basins worldwide. The current consensus is that oceanic transform faults initiate after the onset of seafloor spreading. However, this inference has been difficult to test given the lack of direct observations of transform fault formation. Here we integrate evidence from surface faults, geodetic measurements, local seismicity, and numerical modeling of the subaerial Afar continental rift and show that a proto‐transform fault is initiating during the final stages of continental breakup. This is the first direct observation of proto‐transform fault initiation in a continental rift and sheds unprecedented light on their formation mechanisms. We demonstrate that they can initiate during late‐stage continental rifting, earlier in the rifting cycle than previously thought. Future studies of volcanic rifted margins cannot assume that oceanic transform faults initiated after the onset of seafloor spreading.

    Research areas

  • transform fault, continental rifting, East African Rift

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    Rights statement: This is the final published version of the article (version of record). It first appeared online via AGU at https://agupubs.onlinelibrary.wiley.com/doi/full/10.1029/2018GC007947 . Please refer to any applicable terms of use of the publisher.

    Final published version, 5 MB, PDF document

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    Rights statement: This is the final published version of the article (version of record). It first appeared online via AGU at https://agupubs.onlinelibrary.wiley.com/doi/full/10.1029/2018GC007947 . Please refer to any applicable terms of use of the publisher.

    Final published version, 2 MB, PDF document

    Licence: CC BY

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