Cosmogenic 36Cl and 10Be ages of Quaternary glacial and fluvial deposits of the Wind River Range, Wyoming

Abstract

Research Article| November 01, 1997 Cosmogenic 36Cl and 10Be ages of Quaternary glacial and fluvial deposits of the Wind River Range, Wyoming Fred M. Phillips; Fred M. Phillips 1Department of Earth and Environmental Science, New Mexico Tech, Socorro, New Mexico 87801 Search for other works by this author on: GSW Google Scholar Marek G. Zreda; Marek G. Zreda 1Department of Earth and Environmental Science, New Mexico Tech, Socorro, New Mexico 87801 Search for other works by this author on: GSW Google Scholar John C. Gosse; John C. Gosse 2Department of Earth and Environmental Science, Lehigh University, Bethlehem, Pennsylvania 18015 Search for other works by this author on: GSW Google Scholar Jeffrey Klein; Jeffrey Klein 3Department of Physics, University of Pennsylvania, Philadelphia, Pennsylvania 19104 Search for other works by this author on: GSW Google Scholar Edward B. Evenson; Edward B. Evenson 2Department of Earth and Environmental Science, Lehigh University, Bethlehem, Pennsylvania 18015 Search for other works by this author on: GSW Google Scholar Robert D. Hall; Robert D. Hall 4Department of Geology, Indiana University, Indianapolis, Indiana 46202 Search for other works by this author on: GSW Google Scholar Oliver A. Chadwick; Oliver A. Chadwick 5Department of Geography, University of California, Santa Barbara, California 93106 Search for other works by this author on: GSW Google Scholar Pankaj Sharma Pankaj Sharma 6Department of Physics, Purdue University, West Lafayette, Indiana 47907 Search for other works by this author on: GSW Google Scholar Author and Article Information Fred M. Phillips 1Department of Earth and Environmental Science, New Mexico Tech, Socorro, New Mexico 87801 Marek G. Zreda 1Department of Earth and Environmental Science, New Mexico Tech, Socorro, New Mexico 87801 John C. Gosse 2Department of Earth and Environmental Science, Lehigh University, Bethlehem, Pennsylvania 18015 Jeffrey Klein 3Department of Physics, University of Pennsylvania, Philadelphia, Pennsylvania 19104 Edward B. Evenson 2Department of Earth and Environmental Science, Lehigh University, Bethlehem, Pennsylvania 18015 Robert D. Hall 4Department of Geology, Indiana University, Indianapolis, Indiana 46202 Oliver A. Chadwick 5Department of Geography, University of California, Santa Barbara, California 93106 Pankaj Sharma 6Department of Physics, Purdue University, West Lafayette, Indiana 47907 Publisher: Geological Society of America First Online: 01 Jun 2017 Online ISSN: 1943-2674 Print ISSN: 0016-7606 Geological Society of America GSA Bulletin (1997) 109 (11): 1453–1463. https://doi.org/10.1130/0016-7606(1997)109<1453:CCABAO>2.3.CO;2 Article history First Online: 01 Jun 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn Email Permissions Search Site Citation Fred M. Phillips, Marek G. Zreda, John C. Gosse, Jeffrey Klein, Edward B. Evenson, Robert D. Hall, Oliver A. Chadwick, Pankaj Sharma; Cosmogenic 36Cl and 10Be ages of Quaternary glacial and fluvial deposits of the Wind River Range, Wyoming. GSA Bulletin 1997;; 109 (11): 1453–1463. doi: https://doi.org/10.1130/0016-7606(1997)109<1453:CCABAO>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 SocietyGSA Bulletin Search Advanced Search Abstract We measured cosmogenic 36Cl in 56 samples from boulders on moraines and fluvial terraces in the vicinity of the Wind River Range, Wyoming. We also measured 10Be in 10 of the same samples. Most of the 10Be ages were in good agreement with the 36Cl ages, indicating that rock-surface erosion rates were very low. The oldest moraine investigated, the type Sacagewea Ridge site, yielded only a limiting minimum age of >232 ka. The oldest moraines in the type Bull Lake complex also could be constrained only to >130 ka. The main sequence of type Bull Lake moraines yielded age distributions indicating deposition within the intervals 130 to 100 ka and 120 to 100 ka; the best estimates are closer to the upper limits of these ranges, and associated uncertainties are in the range of 10% to 15%. These uncertainties could permit deposition in either marine isotope stage 6 or stage 5d. We found no evidence of glacial deposits dating to marine isotope stage 4. Both Bull Lake–age moraines from Fremont Lake, on the opposite side of the Wind River Range, and boulders on a fluvial terrace above the Wind River, gave age distributions very similar to that of the second oldest Bull Lake advance (ca. 130 to 100 ka). The distribution of boulder ages for Pinedale moraines at Bull Lake indicated deposition between 23 and 16 ka, nearly identical to the distribution of 10Be ages previously reported for the type Pinedale moraines at Fremont Lake. This content is PDF only. Please click on the PDF icon to access. 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