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Exhumation of the North American Cordillera revealed by multi-dating of Upper Jurassic–Upper Cretaceous foreland basin deposits

2014; Geological Society of America; Volume: 126; Issue: 11-12 Linguagem: Inglês

10.1130/b30999.1

1943-2674

C. S. Painter, Bárbara Carrapa, Peter G. DeCelles, George E. Gehrels, Stuart N. Thomson,

Geological formations and processes

Research Article| November 01, 2014 Exhumation of the North American Cordillera revealed by multi-dating of Upper Jurassic–Upper Cretaceous foreland basin deposits Clayton S. Painter; Clayton S. Painter Department of Geosciences, University of Arizona, 1040 E. 4th Street, Tucson, Arizona 85721, USA †Now affiliated with ConocoPhillips; Clayton.S.Painter@conocophillips.com. Search for other works by this author on: GSW Google Scholar Barbara Carrapa; Barbara Carrapa Department of Geosciences, University of Arizona, 1040 E. 4th Street, Tucson, Arizona 85721, USA Search for other works by this author on: GSW Google Scholar Peter G. DeCelles; Peter G. DeCelles Department of Geosciences, University of Arizona, 1040 E. 4th Street, Tucson, Arizona 85721, USA Search for other works by this author on: GSW Google Scholar George E. Gehrels; George E. Gehrels Department of Geosciences, University of Arizona, 1040 E. 4th Street, Tucson, Arizona 85721, USA Search for other works by this author on: GSW Google Scholar Stuart N. Thomson Stuart N. Thomson Department of Geosciences, University of Arizona, 1040 E. 4th Street, Tucson, Arizona 85721, USA Search for other works by this author on: GSW Google Scholar Author and Article Information Clayton S. Painter †Now affiliated with ConocoPhillips; Clayton.S.Painter@conocophillips.com. Department of Geosciences, University of Arizona, 1040 E. 4th Street, Tucson, Arizona 85721, USA Barbara Carrapa Department of Geosciences, University of Arizona, 1040 E. 4th Street, Tucson, Arizona 85721, USA Peter G. DeCelles Department of Geosciences, University of Arizona, 1040 E. 4th Street, Tucson, Arizona 85721, USA George E. Gehrels Department of Geosciences, University of Arizona, 1040 E. 4th Street, Tucson, Arizona 85721, USA Stuart N. Thomson Department of Geosciences, University of Arizona, 1040 E. 4th Street, Tucson, Arizona 85721, USA Publisher: Geological Society of America Received: 13 Sep 2013 Revision Received: 06 Apr 2014 Accepted: 06 May 2014 First Online: 08 Mar 2017 Online ISSN: 1943-2674 Print ISSN: 0016-7606 © 2014 Geological Society of America GSA Bulletin (2014) 126 (11-12): 1439–1464. https://doi.org/10.1130/B30999.1 Article history Received: 13 Sep 2013 Revision Received: 06 Apr 2014 Accepted: 06 May 2014 First Online: 08 Mar 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn Email Permissions Search Site Citation Clayton S. Painter, Barbara Carrapa, Peter G. DeCelles, George E. Gehrels, Stuart N. Thomson; Exhumation of the North American Cordillera revealed by multi-dating of Upper Jurassic–Upper Cretaceous foreland basin deposits. GSA Bulletin 2014;; 126 (11-12): 1439–1464. doi: https://doi.org/10.1130/B30999.1 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 SocietyGSA Bulletin Search Advanced Search Abstract New low-temperature thermochronology and geochronology data from Upper Jurassic–Upper Cretaceous strata from the North American Cordilleran foreland basin in Utah, Colorado, Wyoming, and South Dakota document rapid exhumation rates of the adjacent Cordilleran orogenic belt to the west. Both zircon (U-Th-[Sm])/He (zircon He) and apatite fission track (AFT) thermochronology were applied to proximal and distal synorogenic deposits in order to identify a thermochronometer suitable to record source exhumation during the North America Cordilleran orogeny. AFT lag times from Upper Jurassic–Upper Cretaceous deposits are 0–5 m.y. and indicate a relatively steady-state to slightly increasing exhumation rate between 118 Ma and 66 Ma. These lag-time measurements are consistent with active shortening and rapid exhumation rates of ∼0.9–>1 km/m.y. of the North American Cordillera throughout the Cretaceous.Double dating of the detrital AFT samples was performed on apatites with young AFT cooling ages, in order to test whether or not the young cooling ages represent a signal related to exhumation rather than volcanic activity. Maximum depositional ages using detrital zircon U-Pb geochronology match existing ages on basin stratigraphy. This study indicates that AFT is the most effective thermochronometer to resolve source exhumation from Lower to Upper Cretaceous foreland stratigraphy in the central Cordilleran foreland, and indicates that source material was exhumed from 4 to 5 km depths but was never buried more than a few kilometers ( 8–9 km. Double dating of apatites (with AFT and U-Pb) shows that volcanic contamination is a significant issue that can, however, be addressed by double dating. You do not have access to this content, please speak to your institutional administrator if you feel you should have access.