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Post-rift seaward downwarping at passive margins: New insights from southern Oman using stratigraphy to constrain apatite fission-track and (U-Th)/He dating

2007; Geological Society of America; Volume: 35; Issue: 7 Linguagem: Inglês

10.1130/g23639a.1

1943-2682

Yanni Gunnell, Andrew Carter, Carole Petit, Marc Fournier,

Geology and Paleoclimatology Research

Research Article| July 01, 2007 Post-rift seaward downwarping at passive margins: New insights from southern Oman using stratigraphy to constrain apatite fission-track and (U-Th)/He dating Yanni Gunnell; Yanni Gunnell 1Laboratoire de Géographie Physique, Université Paris 7, 2 place Jussieu, 75251 Paris Cedex 5, France Search for other works by this author on: GSW Google Scholar Andy Carter; Andy Carter 2School of Earth Science, Birkbeck College, University of London, Malet Street, London WC1E 7HX, UK Search for other works by this author on: GSW Google Scholar Carole Petit; Carole Petit 3Laboratoire de Tectonique, Université Paris 6, 4 place Jussieu, 75252 Paris Cedex 5, France Search for other works by this author on: GSW Google Scholar Marc Fournier Marc Fournier 3Laboratoire de Tectonique, Université Paris 6, 4 place Jussieu, 75252 Paris Cedex 5, France Search for other works by this author on: GSW Google Scholar Author and Article Information Yanni Gunnell 1Laboratoire de Géographie Physique, Université Paris 7, 2 place Jussieu, 75251 Paris Cedex 5, France Andy Carter 2School of Earth Science, Birkbeck College, University of London, Malet Street, London WC1E 7HX, UK Carole Petit 3Laboratoire de Tectonique, Université Paris 6, 4 place Jussieu, 75252 Paris Cedex 5, France Marc Fournier 3Laboratoire de Tectonique, Université Paris 6, 4 place Jussieu, 75252 Paris Cedex 5, France Publisher: Geological Society of America Received: 20 Dec 2006 Revision Received: 05 Mar 2007 Accepted: 11 Mar 2007 First Online: 09 Mar 2017 Online ISSN: 1943-2682 Print ISSN: 0091-7613 Geological Society of America Geology (2007) 35 (7): 647–650. https://doi.org/10.1130/G23639A.1 Article history Received: 20 Dec 2006 Revision Received: 05 Mar 2007 Accepted: 11 Mar 2007 First Online: 09 Mar 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn Email Permissions Search Site Citation Yanni Gunnell, Andy Carter, Carole Petit, Marc Fournier; Post-rift seaward downwarping at passive margins: New insights from southern Oman using stratigraphy to constrain apatite fission-track and (U-Th)/He dating. Geology 2007;; 35 (7): 647–650. doi: https://doi.org/10.1130/G23639A.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 The plateau edge of southern Oman is used as a natural laboratory to independently test apatite fission-track analysis, (U-Th)/He dating, and stratigraphy as methods for quantifying post-rift erosion depths and lithospheric response at passive margins. A mappable unconformity between the Proterozoic basement and the low-conductivity, pre-rift sediment cover links residual buttes preserved at the coast to the escarpment, and therefore imposes tight limitations on parameter choices for modeling the Cenozoic topographic evolution. A mean geothermal gradient of ∼33 °C km−1 ensures the best fit between the thermochronologic data and the stratigraphically defined coast-to-scarp maximum denudation depth of ∼1.75 km. With a lithospheric elastic thickness of 7 km, the resulting flexural response generates a retreat and uplift of the escarpment associated with a seaward downwarp of the unconformity, made possible because denudation minima are inboard of the escarpment and sediment loading occurs offshore. This closed experiment confirms the value of low-temperature thermochronology as a tool for quantifying long-term erosion, but also highlights the benefits of including independent stratigraphic information in terms of obtaining more plausible solutions. This study suggests that post-rift downwarping of eroded rift shoulders can occur, and may have not been commonly detected because low-temperature thermochronology data sets lack both suitable geologic data and intrinsic sensitivity. You do not have access to this content, please speak to your institutional administrator if you feel you should have access.