[117] - Shoreline dating of the former Quillagua-Llamara Lake, N-Chile – Implications of global teleconnections to the hydrology of the Atacama Desert

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Citation
Ritter, B., Dunai, T., Stuart, F., Wennrich, V., Melles, M., 2016. Shoreline dating of the former Quillagua-Llamara Lake, N-Chile – Implications of global teleconnections to the hydrology of the Atacama Desert.Proc. of EGU General Assembly 2016, April 17 - 22, 2016, Vienna, 1 - 1.
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Identification
Title(s):Main Title: Shoreline dating of the former Quillagua-Llamara Lake, N-Chile – Implications of global teleconnections to the hydrology of the Atacama Desert
Description(s):Abstract: Cosmogenic nuclide exposure dating of ancient lake-level shoreline terraces of the Quillagua-Llamara Lake in the central Atacama Desert (N-Chile) provides new insights in the paleohydrology of the driest desert on earth. The lake developed from a paleo-exohereic drainage system in the Central Depression, before it opened towards the Pacific and an endohereic drainage system became established due to incision by the Rio Loa. The duration of the lake stages was long enough to cut erosive shoreline terraces into exposed islands. These shoreline features are preserved due to 250 m uplift of islands (Cerro Soledad, Cerro Mogote). Exposure dating of the shorelines reveals the existence of pluvial lake stages in the Atacama Desert during parts of the Late Pliocene and several Pleistocene interglacials (MIS 7, 9, 11, possibly 31, 87-93). These interglacials at least partly coincide with episodes of strong sea-ice retreat or even collapse of theWest Antarctic Ice Sheet. This correlation is traced back to dramatic changes in the oceanographic and atmospheric circulation system in the Equatorial-SE Pacific with implications for global climate. A strong reduction in West Antarctic sea ice, followed by a weakening of the Peru-Chile Current and reduced supply of cold water, may have enabled expansion of the Pacific Warm Pool and thus increased seasurface temperatures along the west coast of South America. These long-lasting, El Niño-like conditions may have in turn decreased the temperature inversion and enabled moisture transport towards the western Andean flanks. Our findings are compatible with evidence from the ANDRILL 1B record from the Ross Sea, Antarctica, and warm-water faunal assemblages on marine shoreline terraces from northern Chile. Furthermore, the exposure ages of the pluvial lake stages narrow the maximum incision age the of Rio Loa canyon and break through the Coastal Cordillera, and imply rock uplift rates of isolated islands in the Central Depression in the Quaternary that are significantly higher than previously suggested.
Responsible Party
Creator(s):Author: Benedikt Ritter
Author: Tibor Dunai
Author: Finlay Stuart
Author: Volker Wennrich
Author: Martin Melles
Publisher:EGU General Assembly 2016
Topic
CRC1211 Topic:Climate
Related Sub-project(s):A2, D1
Subject(s):CRC1211 Keywords: Cosmogenic Nuclides, Geomorphology, Quaternary Geology
File Details
File Name:EGU2016_B.Ritter_Abstract.pdf
Data Type:Text
File Size:36 kB (0.035 MB)
Date(s):Available: 2016-04-01
Mime Type:application/pdf
Language:English
Status:Completed
Constraints
Download Permission:Free
General Access and Use Conditions:According to the CRC1211DB data policy agreement.
Access Limitations:According to the CRC1211DB data policy agreement.
Geographic
North:-no map data
East:-
South:-
West:-
Measurement Region:Central focus area
Measurement Location:--Central focus area--
Specific Informations - Publication
Status:Accepted
Review:NoPeerReview
Year:2016
Type:Event Paper
Number Of Pages:1
Page Range:1 - 1
Event Name:EGU General Assembly 2016
Event Location:Vienna
Event Period:17th of April, 2016 - 22nd of April, 2016
Metadata Details
Metadata Creator:Benedikt Ritter
Metadata Created:2019-06-26
Metadata Last Updated:2020-04-08
Subproject:A2
Funding Phase:1
Metadata Language:English
Metadata Version:V43
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