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A continuous, high-resolution record of late Pleistocene climate variability from the Estancia Basin, New Mexico

Bruce D. Allen and Roger Y. Anderson
A continuous, high-resolution record of late Pleistocene climate variability from the Estancia Basin, New Mexico
Geological Society of America Bulletin (September 2000) 112 (9): 1444-1458

Abstract

Lake sediments that accumulated in the Estancia basin, central New Mexico, provide a detailed record of submillennial latest Pleistocene climatic oscillations. Sedimentologic, biologic, and geochemical proxies for changes in salinity and lake level were used to identify episodes of wet and dry climate that occurred between 24 and 12 k.y. B.P., as dated by (super 14) C by means of accelerator mass spectrometry from shoreline and basin-center deposits. These dates determine the timing and duration of the episodes of wet and dry climate. The lake expanded and contracted repeatedly during the last glacial maximum and fluctuated near its highest elevation several times during the interval ca. 20 to 15 k.y. B.P. A pronounced lowstand lasting approximately 1 k.y. occurred between ca. 15 and 14 k.y. B.P., followed by two more highstands of the lake between ca. 14 and 12.5 k.y. B.P. Desiccation of the perennial lake after 12 k.y. B.P. was followed by a final, poorly dated highstand at ca. 10 k.y. B.P. The record of lake-level fluctuations from the Estancia basin provides a high-resolution record of changes in water budget in a basin, the comparatively simple physiography and hydrogeology of which ensured a direct response to the strong climatic fluctuations that occurred during the last glacial maximum and termination.


ISSN: 0016-7606
EISSN: 1943-2674
Coden: BUGMAF
Serial Title: Geological Society of America Bulletin
Serial Volume: 112
Serial Issue: 9
Title: A continuous, high-resolution record of late Pleistocene climate variability from the Estancia Basin, New Mexico
Affiliation: New Mexico Institute of Mining and Technology, New Mexico Bureau of Mines and Mineral Resources, Socorro, NM, United States
Pages: 1444-1458
Published: 200009
Text Language: English
Publisher: Geological Society of America (GSA), Boulder, CO, United States
References: 43
Accession Number: 2000-075454
Categories: Quaternary geology
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. 2 tables, sketch map
N34°13'60" - N35°02'60", W106°30'00" - W105°17'60"
Secondary Affiliation: University of New Mexico, USA, United States
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Reference includes data supplied by the Geological Society of America, Boulder, CO, United States
Update Code: 200024
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