IMHE OpenIR  > Journal of Mountain Science  > Journal of Mountain Science-2017  > Vol14 No.2
Relict glacial landscape in the Sierra Baguales Mountain Range (50°-51° S): evidence of glaciation dynamics and types in the eastern foothills of the southern Patagonian Andes
ARAOS. José Miguel; LE ROUX. Jacobus Philiphus; GUTIERREZ. Néstor Mauricio
Corresponding AuthorARAOS. José Miguel
2017-02
Source PublicationJournal of Mountain Science
ISSN1672-6316
Volume14Issue:2Pages:282-295
Subtype期刊论文
AbstractThe glacial morphology of southern South American presents invaluable evidence to reconstruct former glacier behaviour and its relation to climate and environmental changes. However, there are still spatial and temporal gaps in the reconstruction of the Holocene Patagonian glacial landscape. Here we present the first geomorphological record for the Sierra Baguales Mountain Range (SBMR), forming the eastern foothills of the Southern Patagonian Andes 200 km from the Pacific coast. This area is topographically isolated from the Southern Patagonian Ice Field (SPIF), and is affected by the Westerly Winds. The study area shows evidence of ice sheet and alpine glaciations related to Andean uplift, which caused a marked climatic contrast between its western and eastern flanks since the Last Glacial Maximum (LGM). The regional rock mass strength and precipitation gradient acted as a controlling factor in the glacial cirque distribution and sizes, as well as in the development of glaciation types. We report new radiocarbon dates associated with warm/dry to cold/wet climatic changes during the middle Holocene, when former small alpine glaciers were located in the uppermost section of the SBMR basins, and eventually converged to form a small ice field or a composite valley glacier at lower elevations. This can be explained by an estimated regional temperature drop of 3.8°C±0.8°C, based on a 585±26 m Equilibrium Line Altitude (ELA) descent, inferred by geomorphological evidence and the Accumulation Area Ratio (AAR), in addition to a free-air adiabatic lapse rate. Subsequently, the glaciers receded due to climatic factors including a rise in temperature, as well as non-climatic factors, mainly the glacier bedrock topography.
KeywordGlacial Morphology Sierra Baguales Ice Sheet Glaciations Alpine Glaciations Middle Holocene
DOI10.1007/s11629-016-4151-8
Indexed BySCI
Language英语
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Cited Times:1[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.imde.ac.cn/handle/131551/18418
CollectionJournal of Mountain Science_Journal of Mountain Science-2017_Vol14 No.2
Recommended Citation
GB/T 7714
ARAOS. José Miguel,LE ROUX. Jacobus Philiphus,GUTIERREZ. Néstor Mauricio. Relict glacial landscape in the Sierra Baguales Mountain Range (50°-51° S): evidence of glaciation dynamics and types in the eastern foothills of the southern Patagonian Andes[J]. Journal of Mountain Science,2017,14(2):282-295.
APA ARAOS. José Miguel,LE ROUX. Jacobus Philiphus,&GUTIERREZ. Néstor Mauricio.(2017).Relict glacial landscape in the Sierra Baguales Mountain Range (50°-51° S): evidence of glaciation dynamics and types in the eastern foothills of the southern Patagonian Andes.Journal of Mountain Science,14(2),282-295.
MLA ARAOS. José Miguel,et al."Relict glacial landscape in the Sierra Baguales Mountain Range (50°-51° S): evidence of glaciation dynamics and types in the eastern foothills of the southern Patagonian Andes".Journal of Mountain Science 14.2(2017):282-295.
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