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- W2018092557 abstract "Research Article| May 01, 2007 Radiation damage control on apatite (U-Th)/He dates from the Grand Canyon region, Colorado Plateau R.M. Flowers; R.M. Flowers 1Division of Geological and Planetary Science, California Institute of Technology, Pasadena, California 91125, USA Search for other works by this author on: GSW Google Scholar D.L. Shuster; D.L. Shuster 2Berkeley Geochronology Center, 2455 Ridge Road, Berkeley, California 94709, USA Search for other works by this author on: GSW Google Scholar B.P. Wernicke; B.P. Wernicke 3Division of Geological and Planetary Science, California Institute of Technology, Pasadena, California 91125, USA Search for other works by this author on: GSW Google Scholar K.A. Farley K.A. Farley 3Division of Geological and Planetary Science, California Institute of Technology, Pasadena, California 91125, USA Search for other works by this author on: GSW Google Scholar Author and Article Information R.M. Flowers 1Division of Geological and Planetary Science, California Institute of Technology, Pasadena, California 91125, USA D.L. Shuster 2Berkeley Geochronology Center, 2455 Ridge Road, Berkeley, California 94709, USA B.P. Wernicke 3Division of Geological and Planetary Science, California Institute of Technology, Pasadena, California 91125, USA K.A. Farley 3Division of Geological and Planetary Science, California Institute of Technology, Pasadena, California 91125, USA Publisher: Geological Society of America Received: 22 Oct 2006 Revision Received: 21 Dec 2006 Accepted: 29 Dec 2006 First Online: 09 Mar 2017 Online ISSN: 1943-2682 Print ISSN: 0091-7613 Geological Society of America Geology (2007) 35 (5): 447–450. https://doi.org/10.1130/G23471A.1 Article history Received: 22 Oct 2006 Revision Received: 21 Dec 2006 Accepted: 29 Dec 2006 First Online: 09 Mar 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn Email Permissions Search Site Citation R.M. Flowers, D.L. Shuster, B.P. Wernicke, K.A. Farley; Radiation damage control on apatite (U-Th)/He dates from the Grand Canyon region, Colorado Plateau. Geology 2007;; 35 (5): 447–450. doi: https://doi.org/10.1130/G23471A.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 Individual detrital apatite grains from the Esplanade, Coconino, and Moenkopi Formations in the Grand Canyon region of the Colorado Plateau yield (U-Th)/He dates from 104 to 5 Ma. The range of dates within each unit far exceeds analytical uncertainty, but correlates with both He concentration [He] and effective U concentration [eU]. These dates are all significantly younger than the sandstone units, indicating partial to complete He loss following deposition. Recently published laboratory diffusion data suggest that He retentivity in apatite increases with radiation damage. Forward models predict that the consequences of this effect will be manifested most clearly as a correlation between (U-Th)/He dates and the [He] and [eU] in suites of apatites that (1) are characterized by a large span of [eU], and (2) had thermal histories in which sufficient time elapsed for the apatite He diffusion kinetics to diverge prior to reheating and partial resetting. Apatites in the sedimentary units investigated fit these cri teria. Using geologically reasonable deposition, burial, and unroofing histories, simulations that include the effect of radiation damage on apatite He retentivity can reproduce the observed distributions of apatite dates and correlations with parent and daughter concentrations. These results suggest that a span of (U-Th)/He dates positively correlated with [eU] may provide important information regarding a sample's thermal history. You do not have access to this content, please speak to your institutional administrator if you feel you should have access." @default.
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- W2018092557 title "Radiation damage control on apatite (U-Th)/He dates from the Grand Canyon region, Colorado Plateau" @default.
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