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  

作　　者：ARAOS.JoséMiguel LE ROUX.Jacobus Philiphus GUTIERREZ.Néstor Mauricio 

机构地区：[1]Department of Geology,FCFM,Universidad de Chile,Plaza Ercilla#803,Santiago,Chile [2]Department of Geography,Faculty of Social Sciences.Universidad Alberto Hurtado,Uienfuegos#41,Santiago,Chile [3]Department of Geology,FCFM,Universidad de Chile.Andean Geothermal Centre of Excellence,Plaza Ereilla#803,Santiago,Chile

出　　处：《Journal of Mountain Science》2017年第2期282-295,共14页山地科学学报（英文）

基　　金：supported by Project CONICYT/FONDAP/15090013

摘　　要：The 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±26m 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.

关 键 词：Glacial morphology Sierra Baguales Ice sheet glaciations Alpine glaciations Middle Holocene 

分 类 号：P931.4[天文地球—自然地理学]