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Late glacial and Holocene glacier fluctuations at Nevado Huaguruncho in the Eastern Cordillera of the Peruvian Andes

Nathan D. Stansell, Donald T. Rodbell, Joseph M. Licciardi, Christopher M. Sedlak, Avriel D. Schweinsberg, Elizabeth G. Huss, Grace M. Delgado, Susan H. Zimmerman and Robert C. Finkel
Late glacial and Holocene glacier fluctuations at Nevado Huaguruncho in the Eastern Cordillera of the Peruvian Andes
Geology (Boulder) (August 2015) 43 (8): 747-750

Abstract

Discerning the timing and pattern of late Quaternary glacier variability in the tropical Andes is important for our understanding of global climate change. Terrestrial cosmogenic nuclide (TCN) ages (48) on moraines and radiocarbon-dated clastic sediment records from a moraine-dammed lake at Nevado Huaguruncho, Peru, document the waxing and waning of alpine glaciers in the Eastern Cordillera during the past approximately 15 k.y. The integrated moraine and lake records indicate that ice advanced at 14.1 + or - 0.4 ka, during the first half of the Antarctic Cold Reversal, and began retreating by 13.7 + or - 0.4 ka. Ice retreated and paraglacial sedimentation declined until ca. 12 ka, when proxy indicators of glacigenic sediment increased sharply, heralding an ice advance that culminated in multiple moraine positions from 11.6 + or - 0.2 ka to 10.3 + or - 0.2 ka. Proxy indicators of glacigenic sediment input suggest oscillating ice extents from ca. 10 to 4 ka, and somewhat more extensive ice cover from 4 to 2 ka, followed by ice retreat. The lack of TCN ages from these intervals suggests that glaciers were less extensive than during the late Holocene. A final Holocene advance occurred during the Little Ice Age (LIA, ca. 0.4 to 0.2 ka) under colder and wetter conditions as documented in regional proxy archives. The pattern of glacier variability at Huaguruncho during the Late Glacial and Holocene is similar to the pattern of tropical Atlantic sea-surface temperatures, and provides evidence that prior to the LIA, ice extent in the eastern tropical Andes was decoupled from temperatures in the high-latitude North Atlantic.


ISSN: 0091-7613
EISSN: 1943-2682
Coden: GLGYBA
Serial Title: Geology (Boulder)
Serial Volume: 43
Serial Issue: 8
Title: Late glacial and Holocene glacier fluctuations at Nevado Huaguruncho in the Eastern Cordillera of the Peruvian Andes
Affiliation: Northern Illinois University, Department of Geology and Environmental Geosciences, DeKalb, IL, United States
Pages: 747-750
Published: 201508
Text Language: English
Publisher: Geological Society of America (GSA), Boulder, CO, United States
References: 14
Accession Number: 2015-082201
Categories: Quaternary geologyGeochronology
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. sketch map
S10°29'20" - S10°29'20", W75°59'04" - W75°59'04"
Secondary Affiliation: Union College, USA, United StatesUniversity of New Hampshire, USA, United StatesOhio State University, USA, United StatesLawrence Livermore National Laboratory, USA, United States
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Reference includes data from GeoScienceWorld, Alexandria, VA, United States. Reference includes data supplied by the Geological Society of America, Boulder, CO, United States
Update Code: 201535
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