DOI: 10.1016/j.quascirev.2012.08.023
Scopus记录号: 2-s2.0-84878946242
论文题名: Magnitude, geomorphologic response and climate links of lake level oscillations at Laguna Potrok Aike, Patagonian steppe (Argentina)
作者: Kliem P. ; Buylaert J.P. ; Hahn A. ; Mayr C. ; Murray A.S. ; Ohlendorf C. ; Veres D. ; Wastegård S. ; Zolitschka B.
刊名: Quaternary Science Reviews
ISSN: 2773791
出版年: 2013
卷: 71 起始页码: 131
结束页码: 146
语种: 英语
英文关键词: Glacial
; Holocene
; ICDP-project PASADO
; Lake terraces
; Permafrost
; Southern Hemispheric Westerlies
Scopus关键词: Glacial
; Holocenes
; ICDP-project PASADO
; Lacustrine sediments
; Lake level fluctuations
; Regional water balance
; Southern Hemispheric Westerlies
; Surrounding soft rock
; Catchments
; Curve fitting
; Deposits
; Glacial geology
; Groundwater
; Permafrost
; Rain
; Runoff
; Salinity measurement
; Sedimentary rocks
; Soils
; Lakes
; catchment
; data set
; geomorphology
; groundwater
; Last Glacial Maximum
; Little Ice Age
; luminescence
; maar
; magnitude
; mass movement
; Miocene
; oscillation
; permafrost
; precipitation (climatology)
; semiarid region
; Southern Hemisphere
; steppe
; tephrochronology
; transgression
; Argentina
; Laguna Potrok Aike
; Patagonia
; Santa Cruz [Argentina]
英文摘要: Laguna Potrok Aike is a large maar lake located in the semiarid steppe of southern Patagonia known for its Lateglacial and Holocene lake level fluctuations. Based on sedimentary, seismic and geomorphological evidences, the lake level curve is updated and extended into the Last Glacial period and the geomorphological development of the lake basin and its catchment area is interpreted.Abrasion and lake level oscillations since at least ~50ka caused concentric erosion of the surrounding soft rocks of the Miocene Santa Cruz Formation and expanded the basin diameter by approximately 1km. A high lake level and overflow conditions of the lake were dated by luminescence methods and tephra correlation to the early Lateglacial as well as to ~45ka. The lowest lake level of record occurred during the mid-Holocene. A further lake level drop was probably prevented by groundwater supply. This low lake level eroded a distinct terrace into lacustrine sediments. Collapse of these terraces probably caused mass movement deposits in the profundal zone of the lake. After the mid-Holocene lake level low stand a general and successive transgression occurred until the Little Ice Age maximum; i.e. ca 40m above the local groundwater table. Frequent lake level oscillations caused deflation of emerged terraces only along the eastern shoreline due to prevailing westerly winds. Preservation of eolian deposits might be linked to relatively moist climate conditions during the past 2.5ka.Precisely dated lake level reconstructions in the rain-shadow of the Andes document high Last Glacial and low Holocene lake levels that could suggest increased precipitation during the Last Glacial period. As permafrost in semiarid Patagonia is documented and dated to the Last Glacial period we argue that the frozen ground might have increased surficial runoff from the catchment and thus influenced the water balance of the lake. This is important for investigating the glacial to Holocene latitudinal shift and/or strengthening of the Southern Hemispheric Westerlies by using lake level reconstructions as a means to assess the regional water balance. Our interpretation explains the contradiction with investigations based on pollen data indicating drier climatic conditions for the Last Glacial period. © 2012 Elsevier Ltd. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/60622
Appears in Collections: 过去全球变化的重建
There are no files associated with this item.
作者单位: Geomorphology and Polar Research (GEOPOLAR), Institute of Geography, University of Bremen, Celsiusstr. FVG-M, D-28359 Bremen, Germany; Nordic Laboratory for Luminescence Dating, Department of Geosciences, Aarhus University, Risø DTU, DK-4000 Roskilde, Denmark; Radiation Research Division, Risø National Laboratory for Sustainable Energy, Technical University of Denmark (Risø DTU), DK-4000 Roskilde, Denmark; Institute of Geography, University of Erlangen-Nürnberg, Kochstr. 4/4, D-91054 Erlangen, Germany; Institute of Paleontology and Geobiology and GeoBio-Center, University of Munich, Richard-Wagner-Str. 10, D-80333 München, Germany; Department of Geology, Babes-Bolyai University, 400084 Cluj-Napoca, Romania; Institute of Speleology, Romanian Academy, 400006 Cluj-Napoca, Romania; Department of Physical Geography and Quaternary Geology, Stockholm University, SE-106 91 Stockholm, Sweden
Recommended Citation:
Kliem P.,Buylaert J.P.,Hahn A.,et al. Magnitude, geomorphologic response and climate links of lake level oscillations at Laguna Potrok Aike, Patagonian steppe (Argentina)[J]. Quaternary Science Reviews,2013-01-01,71