Artigo Revisado por pares

Orogenic pulses in the Alberta Rocky Mountains: Radiometric dating of major faults and comparison with the regional tectono-stratigraphic record

2014; Geological Society of America; Volume: 127; Issue: 3-4 Linguagem: Inglês

10.1130/b31069.1

ISSN

1943-2674

Autores

Dai Pan, Ben A. van der Pluijm,

Tópico(s)

Geochemistry and Geologic Mapping

Resumo

Research Article| March 01, 2015 Orogenic pulses in the Alberta Rocky Mountains: Radiometric dating of major faults and comparison with the regional tectono-stratigraphic record Dinu Ion Pană; Dinu Ion Pană † 1Alberta Energy Regulator/Alberta Geological Survey, Twin Atria Building, 4999-98 Avenue, Edmonton, Alberta T6B 2X3, Canada †dinu.pana@aer.ca; vdpluijm@umich.edu. Search for other works by this author on: GSW Google Scholar Ben A. van der Pluijm Ben A. van der Pluijm † 2Department of Earth and Environmental Sciences, University of Michigan, 1100 N. University Avenue, Ann Arbor, Michigan 48109-1005, USA †dinu.pana@aer.ca; vdpluijm@umich.edu. Search for other works by this author on: GSW Google Scholar Author and Article Information Dinu Ion Pană † 1Alberta Energy Regulator/Alberta Geological Survey, Twin Atria Building, 4999-98 Avenue, Edmonton, Alberta T6B 2X3, Canada Ben A. van der Pluijm † 2Department of Earth and Environmental Sciences, University of Michigan, 1100 N. University Avenue, Ann Arbor, Michigan 48109-1005, USA †dinu.pana@aer.ca; vdpluijm@umich.edu. Publisher: Geological Society of America Received: 21 Jan 2014 Revision Received: 03 Jul 2014 Accepted: 07 Aug 2014 First Online: 08 Mar 2017 Online ISSN: 1943-2674 Print ISSN: 0016-7606 © 2014 Geological Society of America GSA Bulletin (2015) 127 (3-4): 480–502. https://doi.org/10.1130/B31069.1 Article history Received: 21 Jan 2014 Revision Received: 03 Jul 2014 Accepted: 07 Aug 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 Dinu Ion Pană, Ben A. van der Pluijm; Orogenic pulses in the Alberta Rocky Mountains: Radiometric dating of major faults and comparison with the regional tectono-stratigraphic record. GSA Bulletin 2015;; 127 (3-4): 480–502. doi: https://doi.org/10.1130/B31069.1 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 Radiometric ages from regionally distributed thrust-fault gouge show that the eastward propagation of the southern Rocky Mountain fold-and-thrust belt in Canada occurred in four orogenic pulses that correlate with tectonic events of the Cordilleran interior and with depositional patterns in the adjacent foreland. In the Main Ranges, the Pyramid (163.0 Ma), Simpson Pass (161.7 Ma), and Johnson Creek (145.7 Ma) thrusts were related to the initiation of thin-skinned deformation from Jurassic terrane accretion and were partly contemporaneous with development of the first clastic wedge in the foreland basin. In the Front Ranges, the emplacement of the Greenock thrust (103.1 Ma) and Broadview–Snake Indian thrust (99.2 Ma) was contemporaneous with development of Cenomanian deltaic deposits in the immediate foreland. Three thrusts in the Front Ranges, Rocky Pass (74.8 Ma), Sulfur Mountain (75.6 Ma), and Clearwater (74.2 Ma) thrusts, define a Campanian phase of tectonic loading that led to the last major transgression in the southern portion of the Alberta foreland. Along the eastern margin of the Front Ranges, the McConnell thrust (54.0 Ma), together with the Muskeg (52.4 Ma), Brule (53.9 Ma), and Nikanassin (52.1 Ma) thrusts in the Foothills, recorded the last phase of regional contraction. The Late Jurassic, mid-Cretaceous, Late Cretaceous, and early Eocene deformation pulses are separated by relatively long periods (>40 m.y., >20 m.y., and >10 m.y.) of tectonic quiescence. These spatially and temporally restricted fault motion pulses contrast with gradual, forward fault propagation, while regional eastward progression of deformation is preserved. You do not have access to this content, please speak to your institutional administrator if you feel you should have access.

Referência(s)