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Slip re-orientation in oblique rifts

2015; Geological Society of America; Volume: 43; Issue: 2 Linguagem: Inglês

10.1130/g36208.1

1943-2682

Mélody Philippon, Ernst Willingshofer, Dimitrios Sokoutis, Giacomo Corti, Federico Sani, Marco Bonini, Sierd Cloetingh,

Landslides and related hazards

Research Article| February 01, 2015 Slip re-orientation in oblique rifts M. Philippon; M. Philippon 1Faculty of Earth Science, Utrecht University, P.O. Box 80021, Utrecht 3508 TA, Netherlands2Gesociences Montpellier, UMR CNRS 5243, Université des Antilles Guyane, Pointe-à-Pitre 97157, French West Indies Search for other works by this author on: GSW Google Scholar E. Willingshofer; E. Willingshofer 1Faculty of Earth Science, Utrecht University, P.O. Box 80021, Utrecht 3508 TA, Netherlands Search for other works by this author on: GSW Google Scholar D. Sokoutis; D. Sokoutis 1Faculty of Earth Science, Utrecht University, P.O. Box 80021, Utrecht 3508 TA, Netherlands3Department of Geosciences, University of Oslo, PO Box 1047 Blindern, N-0316 Oslo, Norway Search for other works by this author on: GSW Google Scholar G. Corti; G. Corti 4Istituto di Geoscienze e Georisorse, Consiglio Nazionale delle Ricerche, Via G. La Pira, Florence 50121, Italy Search for other works by this author on: GSW Google Scholar F. Sani; F. Sani 5Dipartimento di Scienze della Terra, Università degli Studi di Firenze, Via G. La Pira, Florence 50121, Italy Search for other works by this author on: GSW Google Scholar M. Bonini; M. Bonini 4Istituto di Geoscienze e Georisorse, Consiglio Nazionale delle Ricerche, Via G. La Pira, Florence 50121, Italy Search for other works by this author on: GSW Google Scholar S. Cloetingh S. Cloetingh 1Faculty of Earth Science, Utrecht University, P.O. Box 80021, Utrecht 3508 TA, Netherlands Search for other works by this author on: GSW Google Scholar Author and Article Information M. Philippon 1Faculty of Earth Science, Utrecht University, P.O. Box 80021, Utrecht 3508 TA, Netherlands2Gesociences Montpellier, UMR CNRS 5243, Université des Antilles Guyane, Pointe-à-Pitre 97157, French West Indies E. Willingshofer 1Faculty of Earth Science, Utrecht University, P.O. Box 80021, Utrecht 3508 TA, Netherlands D. Sokoutis 1Faculty of Earth Science, Utrecht University, P.O. Box 80021, Utrecht 3508 TA, Netherlands3Department of Geosciences, University of Oslo, PO Box 1047 Blindern, N-0316 Oslo, Norway G. Corti 4Istituto di Geoscienze e Georisorse, Consiglio Nazionale delle Ricerche, Via G. La Pira, Florence 50121, Italy F. Sani 5Dipartimento di Scienze della Terra, Università degli Studi di Firenze, Via G. La Pira, Florence 50121, Italy M. Bonini 4Istituto di Geoscienze e Georisorse, Consiglio Nazionale delle Ricerche, Via G. La Pira, Florence 50121, Italy S. Cloetingh 1Faculty of Earth Science, Utrecht University, P.O. Box 80021, Utrecht 3508 TA, Netherlands Publisher: Geological Society of America Received: 21 Aug 2014 Revision Received: 24 Nov 2014 Accepted: 25 Nov 2014 First Online: 09 Mar 2017 Online ISSN: 1943-2682 Print ISSN: 0091-7613 © 2015 Geological Society of America Geology (2015) 43 (2): 147–150. https://doi.org/10.1130/G36208.1 Article history Received: 21 Aug 2014 Revision Received: 24 Nov 2014 Accepted: 25 Nov 2014 First Online: 09 Mar 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn Email Permissions Search Site Citation M. Philippon, E. Willingshofer, D. Sokoutis, G. Corti, F. Sani, M. Bonini, S. Cloetingh; Slip re-orientation in oblique rifts. Geology 2015;; 43 (2): 147–150. doi: https://doi.org/10.1130/G36208.1 Download citation file: Ris (Zotero) Refmanager EasyBib Bookends Mendeley Papers EndNote RefWorks BibTex toolbar search Search Dropdown Menu toolbar search search input Search input auto suggest filter your search All ContentBy SocietyGeology Search Advanced Search Abstract Oblique extension is expected to result in a combination of dip-slip and strike-slip displacement along faults with strike orthogonal and oblique to the extension direction, respectively. This general concept is in disagreement with observations from natural oblique rifts, where faults show dip-slip kinematics indicating pure extension irrespective of the fault strike with respect to the regional extension direction. Consequently, along oblique structures, slip is re-oriented, and oblique to the applied extension direction. Besides, at fault scale, slip is re-oriented along strike such that it is dip slip at the fault center and becomes highly oblique slip toward the fault tips. Here, we use analogue experiments to show that this discrepancy can be resolved when a preexisting weak zone (WZ) is present in the crust at the onset of oblique extension. The WZ is implemented within the lower crust and strikes oblique to the extension direction. Our experimental results show that an inherited WZ within the ductile crust favors the re-orientation of slip such that oblique extension results in pure dip-slip displacement on faults that strike oblique with respect to the extension direction. Furthermore, we show that slip is re-oriented along strike of major faults, such that the fault center shows dip-slip kinematics, whereas its tips display strike-slip kinematics. These findings call into question the use of paleostress reconstructions to constrain plate kinematics in oblique extensional tectonic settings. 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