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Seismic evidence of up to 200 m lake-level change in Southern Patagonia since Marine Isotope Stage 4

Andrea Catalina Gebhardt, Christian Ohlendorf, Frank Niessen, Marc De Batist UGent, Flavio S Anselmetti, Daniel Ariztegui, Pierre Kliem, Stefan Wastegård and Bernd Zolitschka (2012) SEDIMENTOLOGY. 59(3). p.1087-1100
abstract
Maar lake Laguna Potrok Aike is located north of the Strait of Magellan (southeastern Patagonia). Seismic reflection profiles revealed a highly dynamic palaeoclimate history. Dunes were identified in the eastern part of the lake at approximately 30 to 80 m below the lake floor, overlying older lacustrine strata, and suggest that the region experienced dry conditions probably combined with strong westerly winds. It is quite likely that this can be linked to a major dust event recorded in the Antarctic ice cores during Marine Isotope Stage 4. The dunes are overlain by a series of palaeo shorelines indicating a stepwise water-level evolution of a new lake established after this dry period, and thus a change towards wetter conditions. After the initial, rapid and stepwise lake-level rise, the basin became deeper and wider, and sediments deposited on the lake shoulder at approximately 33 m below present-day lake level point towards a long period of lake-level highstand between roughly 53Æ5 ka cal. bp and 30 ka cal. bp with a maximum lake level some 200 m higher than the desiccation horizon. This highstand was then followed by a regressional phase of uncertain age, although it must have happened some time between approximately 30 ka cal. bp and 6750 yrs cal. bp. Dryer conditions during the Mid-Holocene are evidenced by a dropping lake level, resulting in a basin-wide erosional unconformity on the lake shoulder. A second stepwise transgression between ca 5Æ8 to 5Æ4 ka cal. bp and ca 4Æ7 to 4 ka cal. bp with palaeo-shorelines deposited on the lake shoulder unconformity again indicates a change towards wetter conditions.
Please use this url to cite or link to this publication:
author
organization
year
type
journalArticle (original)
publication status
published
subject
keyword
lacustrine sedimentation, lake-level variations, ICDP project PASADO, climate change, Argentina, Laguna Potrok Aike, Patagonia, seismic reflection profiles, LAGUNA-POTROK-AIKE, LAGO-CARDIEL BASIN, ARGENTINA 49-DEGREES-S, VOLCANIC FIELD, SANTA-CRUZ, VARIABILITY, SEDIMENTS, IMPACT, RECORD, STRATIGRAPHY
journal title
SEDIMENTOLOGY
Sedimentology
volume
59
issue
3
pages
1087 - 1100
Web of Science type
Article
Web of Science id
000301718300018
JCR category
GEOLOGY
JCR impact factor
2.611 (2012)
JCR rank
6/47 (2012)
JCR quartile
1 (2012)
ISSN
0037-0746
DOI
10.1111/j.1365-3091.2011.01296.x
language
English
UGent publication?
yes
classification
A1
copyright statement
I have transferred the copyright for this publication to the publisher
id
2095695
handle
http://hdl.handle.net/1854/LU-2095695
date created
2012-04-27 09:26:03
date last changed
2012-04-27 13:33:15
@article{2095695,
  abstract     = {Maar lake Laguna Potrok Aike is located north of the Strait of Magellan (southeastern Patagonia). Seismic reflection profiles revealed a highly dynamic palaeoclimate history. Dunes were identified in the eastern part of the lake at approximately 30 to 80 m below the lake floor, overlying older lacustrine strata, and suggest that the region experienced dry conditions probably combined with strong westerly winds. It is quite likely that this can be linked to a major dust event recorded in the Antarctic ice cores during Marine Isotope Stage 4. The dunes are overlain by a series of palaeo shorelines indicating a stepwise water-level evolution of a new lake established after this dry period, and thus a change towards wetter conditions. After the initial, rapid and stepwise lake-level rise, the basin became deeper and wider, and sediments deposited on the lake shoulder at approximately 33 m below present-day lake level point towards a long period of lake-level highstand between roughly 53{\AE}5 ka cal. bp and 30 ka cal. bp with a maximum lake level some 200 m higher than the desiccation horizon. This highstand was then followed by a regressional phase of uncertain age, although it must have happened some time between approximately 30 ka cal. bp and 6750 yrs cal. bp. Dryer conditions during the Mid-Holocene are evidenced by a dropping lake level, resulting in a basin-wide erosional unconformity on the lake shoulder. A second stepwise transgression between ca 5{\AE}8 to 5{\AE}4 ka cal. bp and ca 4{\AE}7 to 4 ka cal. bp with palaeo-shorelines deposited on the lake shoulder unconformity again indicates a change towards wetter conditions.},
  author       = {Gebhardt, Andrea Catalina and Ohlendorf, Christian and Niessen, Frank and De Batist, Marc and Anselmetti, Flavio S and Ariztegui, Daniel and Kliem, Pierre and Wasteg{\aa}rd, Stefan and Zolitschka, Bernd},
  issn         = {0037-0746},
  journal      = {SEDIMENTOLOGY},
  keyword      = {lacustrine sedimentation,lake-level variations,ICDP project PASADO,climate change,Argentina,Laguna Potrok Aike,Patagonia,seismic reflection profiles,LAGUNA-POTROK-AIKE,LAGO-CARDIEL BASIN,ARGENTINA 49-DEGREES-S,VOLCANIC FIELD,SANTA-CRUZ,VARIABILITY,SEDIMENTS,IMPACT,RECORD,STRATIGRAPHY},
  language     = {eng},
  number       = {3},
  pages        = {1087--1100},
  title        = {Seismic evidence of up to 200 m lake-level change in Southern Patagonia since Marine Isotope Stage 4},
  url          = {http://dx.doi.org/10.1111/j.1365-3091.2011.01296.x},
  volume       = {59},
  year         = {2012},
}

Chicago
Gebhardt, Andrea Catalina, Christian Ohlendorf, Frank Niessen, Marc De Batist, Flavio S Anselmetti, Daniel Ariztegui, Pierre Kliem, Stefan Wastegård, and Bernd Zolitschka. 2012. “Seismic Evidence of up to 200 m Lake-level Change in Southern Patagonia Since Marine Isotope Stage 4.” Sedimentology 59 (3): 1087–1100.
APA
Gebhardt, A. C., Ohlendorf, C., Niessen, F., De Batist, M., Anselmetti, F. S., Ariztegui, D., Kliem, P., et al. (2012). Seismic evidence of up to 200 m lake-level change in Southern Patagonia since Marine Isotope Stage 4. SEDIMENTOLOGY, 59(3), 1087–1100.
Vancouver
1.
Gebhardt AC, Ohlendorf C, Niessen F, De Batist M, Anselmetti FS, Ariztegui D, et al. Seismic evidence of up to 200 m lake-level change in Southern Patagonia since Marine Isotope Stage 4. SEDIMENTOLOGY. 2012;59(3):1087–100.
MLA
Gebhardt, Andrea Catalina, Christian Ohlendorf, Frank Niessen, et al. “Seismic Evidence of up to 200 m Lake-level Change in Southern Patagonia Since Marine Isotope Stage 4.” SEDIMENTOLOGY 59.3 (2012): 1087–1100. Print.