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Pliocene−Pleistocene incision of the Green River, Kentucky, determined from radioactive decay of cosmogenic 26Al and 10Be in Mammoth Cave sediments

2001; Geological Society of America; Volume: 113; Issue: 7 Linguagem: Inglês

10.1130/0016-7606(2001)113 2.0.co;2

1943-2674

Darryl E. Granger, Derek Fabel, Arthur N. Palmer,

earthquake and tectonic studies

Research Article| July 01, 2001 Pliocene−Pleistocene incision of the Green River, Kentucky, determined from radioactive decay of cosmogenic 26Al and 10Be in Mammoth Cave sediments Darryl E. Granger; Darryl E. Granger 1Purdue Rare Isotope Measurement Laboratory, Department of Earth and Atmospheric Sciences, Purdue University, West Lafayette, Indiana 47907-1397, USA Search for other works by this author on: GSW Google Scholar Derek Fabel; Derek Fabel 1Purdue Rare Isotope Measurement Laboratory, Department of Earth and Atmospheric Sciences, Purdue University, West Lafayette, Indiana 47907-1397, USA Search for other works by this author on: GSW Google Scholar Arthur N. Palmer Arthur N. Palmer 2Department of Earth Sciences, State University of New York, College at Oneonta, Oneonta, New York 13820-4015, USA Search for other works by this author on: GSW Google Scholar GSA Bulletin (2001) 113 (7): 825–836. https://doi.org/10.1130/0016-7606(2001)113 2.0.CO;2 Article history received: 24 Apr 2000 rev-recd: 05 Jul 2000 accepted: 21 Aug 2000 first online: 01 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 Darryl E. Granger, Derek Fabel, Arthur N. Palmer; Pliocene−Pleistocene incision of the Green River, Kentucky, determined from radioactive decay of cosmogenic 26Al and 10Be in Mammoth Cave sediments. GSA Bulletin 2001;; 113 (7): 825–836. doi: https://doi.org/10.1130/0016-7606(2001)113 2.0.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 Cosmogenic 26Al and 10Be in sediments washed into Mammoth Cave, Kentucky, record the history of 3.5 m.y. of water-table position, governed by incision and aggradation of the Green River, a tributary of the Ohio River. Upper levels of the cave formed during a period of slow river incision and were later filled with sediment due to river aggradation at 2.3–2.4 Ma. A brief surge of river incision ca. 2 Ma was followed by river stability and cave-passage formation at a lower level. Rapid incision through 15 m of bedrock ca. 1.5 Ma was prompted by repositioning of the Ohio River to its present course along an ice-sheet margin. Renewed incision ca. 1.2 Ma and aggradation at 0.7–0.8 Ma correlate with major ice advances in the Ohio River basin. Measurements of 26Al and 10Be also indicate that sandstone-capped uplands have maintained slow erosion rates of 2–7 m/m.y. for the past 3.5 m.y., despite accelerated Pleistocene river incision rates of ∼30 m/m.y. You do not have access to this content, please speak to your institutional administrator if you feel you should have access.