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Glacial Geology of the East Flank of the Argentine Andes between Latitude 39°10′S. and Latitude 41°20′S

1964; Geological Society of America; Volume: 75; Issue: 4 Linguagem: Inglês

10.1130/0016-7606(1964)75[335

1943-2674

Richard Foster Flint, Francisco Fidalgo,

Geological and Geochemical Analysis

Research Article| April 01, 1964 Glacial Geology of the East Flank of the Argentine Andes between Latitude 39°10′S. and Latitude 41°20′S RICHARD FOSTER FLINT; RICHARD FOSTER FLINT Dept. Geology, Yale University, New Haven, Conn. Search for other works by this author on: GSW Google Scholar FRANCISCO FIDALGO FRANCISCO FIDALGO Directión National de Geología y Minería, Buenos Aires, Argentina Search for other works by this author on: GSW Google Scholar Author and Article Information RICHARD FOSTER FLINT Dept. Geology, Yale University, New Haven, Conn. FRANCISCO FIDALGO Directión National de Geología y Minería, Buenos Aires, Argentina Publisher: Geological Society of America Received: 25 Jun 1963 First Online: 02 Mar 2017 Online ISSN: 1943-2674 Print ISSN: 0016-7606 Copyright © 1964, The Geological Society of America, Inc. Copyright is not claimed on any material prepared by U.S. government employees within the scope of their employment. GSA Bulletin (1964) 75 (4): 335–352. https://doi.org/10.1130/0016-7606(1964)75[335:GGOTEF]2.0.CO;2 Article history Received: 25 Jun 1963 First Online: 02 Mar 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn Email Permissions Search Site Citation RICHARD FOSTER FLINT, FRANCISCO FIDALGO; Glacial Geology of the East Flank of the Argentine Andes between Latitude 39°10′S. and Latitude 41°20′S. GSA Bulletin 1964;; 75 (4): 335–352. doi: https://doi.org/10.1130/0016-7606(1964)75[335:GGOTEF]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 The segment of the Argentine Andes between lat. 39°10′ S. and lat. 41°20′ S. was glaciated extensively and repeatedly during the late Pleistocene; today only a few small glaciers at high altitudes are present. The former glacier consisted of an ice sheet, in places more than 1500 m thick, centered on the high Cordillera. At times the ice divide may have shifted westward, away from the present water divide, in the direction from which the glacier was principally nourished. The ice sheet separated into lobes that occupied the valleys of major east-flowing streams. The distance between the high Cordillera and the terminus of the longest lobe is about 70 km. Cirque altitudes form an orderly sequence, rising eastward in the direction of increasing temperature and aridity in today's climate.Three bodies of glacial drift were identified: Pichileufú, El Condor, and Nahuel Huapi, in order of decreasing age and extent. Possibly the Nahuel Huapi Drift consists of two members. Small bodies of drift younger than the Nahuel Huapi Drift were not studied.Isotopic dating has not been possible because no datable substances in, or significantly related to, the drifts were found. Comparison of the progress of weathering of granitic clasts in the zones of weathering in the drift bodies suggests that the intervals between the times of drift deposition were not long. None of the drift is believed to be older than the Wisconsin Drift in North America. The data in hand do not permit closer comparison. This content is PDF only. Please click on the PDF icon to access. First Page Preview Close Modal You do not have access to this content, please speak to your institutional administrator if you feel you should have access.