Late thermal evolution of the Oman Mountains subophiolitic windows: Apatite fission-track thermochronology

Research Article| December 01, 1998 Late thermal evolution of the Oman Mountains subophiolitic windows: Apatite fission-track thermochronology Gérard Poupeau; Gérard Poupeau 1UPRES-A 5025 CNRS, Université Joseph Fourier, 15 rue Maurice Gignoux, 38031 Grenoble, France Search for other works by this author on: GSW Google Scholar Omar Saddiqi; Omar Saddiqi 2Université Hassan II, Faculté des Sciences Aïn Chok, Département de Géologie, BP 5366 Mâarif, Casablanca, Morocco Search for other works by this author on: GSW Google Scholar André Michard; André Michard 3Ecole Normale Supérieure, Laboratoire de Géologie, URA 1316 CNRS, 24 rue Lhomond, 75231 Paris Cedex 05, France Search for other works by this author on: GSW Google Scholar Bruno Goffé; Bruno Goffé 3Ecole Normale Supérieure, Laboratoire de Géologie, URA 1316 CNRS, 24 rue Lhomond, 75231 Paris Cedex 05, France Search for other works by this author on: GSW Google Scholar Roland Oberhänsli Roland Oberhänsli 4Institut fur Geowissenschaften, Universität Potsdam, Postfach 601553, D-14415 Potsdam, Germany Search for other works by this author on: GSW Google Scholar Author and Article Information Gérard Poupeau 1UPRES-A 5025 CNRS, Université Joseph Fourier, 15 rue Maurice Gignoux, 38031 Grenoble, France Omar Saddiqi 2Université Hassan II, Faculté des Sciences Aïn Chok, Département de Géologie, BP 5366 Mâarif, Casablanca, Morocco André Michard 3Ecole Normale Supérieure, Laboratoire de Géologie, URA 1316 CNRS, 24 rue Lhomond, 75231 Paris Cedex 05, France Bruno Goffé 3Ecole Normale Supérieure, Laboratoire de Géologie, URA 1316 CNRS, 24 rue Lhomond, 75231 Paris Cedex 05, France Roland Oberhänsli 4Institut fur Geowissenschaften, Universität Potsdam, Postfach 601553, D-14415 Potsdam, Germany Publisher: Geological Society of America First Online: 02 Jun 2017 Online ISSN: 1943-2682 Print ISSN: 0091-7613 Geological Society of America Geology (1998) 26 (12): 1139–1142. https://doi.org/10.1130/0091-7613(1998)026<1139:LTEOTO>2.3.CO;2 Article history First Online: 02 Jun 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn MailTo Tools Icon Tools Get Permissions Search Site Citation Gérard Poupeau, Omar Saddiqi, André Michard, Bruno Goffé, Roland Oberhänsli; Late thermal evolution of the Oman Mountains subophiolitic windows: Apatite fission-track thermochronology. Geology 1998;; 26 (12): 1139–1142. doi: https://doi.org/10.1130/0091-7613(1998)026<1139:LTEOTO>2.3.CO;2 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 In the southern Oman Mountains, high-pressure metamorphic rocks of continental origin crop out beneath the Cretaceous Samail ophiolitic nappe. We collected 14 samples from 15 to 1200 m above sea level and at various structural levels that show apatite fission-track ages between 40 ± 7 and 55 ± 5 Ma. The mean confined track lengths vary from 13.08 to 13.70 µm. Fission-track data optimization shows that the subophiolitic units cooled slowly below 60 °C at ca. 53 Ma, then remained at low temperature until ca. 19 Ma, i.e., during the weak postorogenic subsidence of the obduction belt. The subophiolitic basement was reheated to ∼70–80 °C at ca. 7–4 Ma, before final cooling. The reheating event is correlated with the late Miocene–Pliocene (Zagros) compressional phase. Post-Oligocene heating up to 80 °C is also documented by stable isotope study of the post-nappe Eocene-Oligocene onlap. Both the Paleocene and the Pliocene-Quaternary denudation rates are close to 0.3 mm/yr, and compatible with isostatically assisted erosion processes. This content is PDF only. Please click on the PDF icon to access. First Page Preview Close Modal You do not have access to this content, please speak to your institutional administrator if you feel you should have access.