Geophysical evidence of multiple glacier advances in Lago Fagnano (54°S), southernmost Patagonia
The Island of Tierra del Fuego, at the southernmost extreme of Patagonia, is located in one of the most extensively glaciated areas of the Southern Hemisphere outside Antarctica during the late Pleistocene. The Lago Fagnano region, at ~54°30′S and ~68°W, has experienced several phases of glacier gro...
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Online Access: | https://doi.org/10.1016/j.quascirev.2010.01.016 |
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fteawag:oai:dora:eawag_6357 2024-09-15T17:45:44+00:00 Geophysical evidence of multiple glacier advances in Lago Fagnano (54°S), southernmost Patagonia Waldmann, Nicolas Ariztegui, Daniel Anselmetti, Flavio S. Coronato, Andrea Austin Jr., James A. 2010 https://doi.org/10.1016/j.quascirev.2010.01.016 eng eng Elsevier Quaternary Science Reviews--Quat. Sci. Rev.--journals:2468--0277-3791 eawag:6357 journal id: journals:2468 issn: 0277-3791 ut: 000277813300010 local: 14440 scopus: 2-s2.0-77950594124 doi:10.1016/j.quascirev.2010.01.016 Text Journal Article 2010 fteawag https://doi.org/10.1016/j.quascirev.2010.01.016 2024-08-05T03:04:28Z The Island of Tierra del Fuego, at the southernmost extreme of Patagonia, is located in one of the most extensively glaciated areas of the Southern Hemisphere outside Antarctica during the late Pleistocene. The Lago Fagnano region, at ~54°30′S and ~68°W, has experienced several phases of glacier growth and retreat since the Last Glacial Maximum (LGM). We illustrate these phases using combined geomorphological, geophysical and coring surveys in Lago Fagnano itself, a ~105 km-long, E–W-oriented glacio-tectonic basin. We identify and map a complex set of submerged frontal, central and lateral moraines covered by lacustrine sediments using seismic stratigraphic analysis of multi-channel profiles imaging the sub-lake floor. We then combine these geophysical data with field observations and regional maps of similar structures around the lake to reconstruct the spatial behavior of the Fagnano paleo-glacier since the LGM. We interpret the preserved frontal moraines as having formed during at least 20 re-advance stages of the glacier within a long-term deglaciation interval post-LGM. Preliminary tephrochronological dating of a ~7.5 m long core indicates a step-wise deglaciation pattern comprising a final glacier re-advance stage at ~11.2 ka BP. Article in Journal/Newspaper Antarc* Antarctica Tierra del Fuego DORA Eawag Quaternary Science Reviews 29 9-10 1188 1200 |
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language |
English |
description |
The Island of Tierra del Fuego, at the southernmost extreme of Patagonia, is located in one of the most extensively glaciated areas of the Southern Hemisphere outside Antarctica during the late Pleistocene. The Lago Fagnano region, at ~54°30′S and ~68°W, has experienced several phases of glacier growth and retreat since the Last Glacial Maximum (LGM). We illustrate these phases using combined geomorphological, geophysical and coring surveys in Lago Fagnano itself, a ~105 km-long, E–W-oriented glacio-tectonic basin. We identify and map a complex set of submerged frontal, central and lateral moraines covered by lacustrine sediments using seismic stratigraphic analysis of multi-channel profiles imaging the sub-lake floor. We then combine these geophysical data with field observations and regional maps of similar structures around the lake to reconstruct the spatial behavior of the Fagnano paleo-glacier since the LGM. We interpret the preserved frontal moraines as having formed during at least 20 re-advance stages of the glacier within a long-term deglaciation interval post-LGM. Preliminary tephrochronological dating of a ~7.5 m long core indicates a step-wise deglaciation pattern comprising a final glacier re-advance stage at ~11.2 ka BP. |
format |
Article in Journal/Newspaper |
author |
Waldmann, Nicolas Ariztegui, Daniel Anselmetti, Flavio S. Coronato, Andrea Austin Jr., James A. |
spellingShingle |
Waldmann, Nicolas Ariztegui, Daniel Anselmetti, Flavio S. Coronato, Andrea Austin Jr., James A. Geophysical evidence of multiple glacier advances in Lago Fagnano (54°S), southernmost Patagonia |
author_facet |
Waldmann, Nicolas Ariztegui, Daniel Anselmetti, Flavio S. Coronato, Andrea Austin Jr., James A. |
author_sort |
Waldmann, Nicolas |
title |
Geophysical evidence of multiple glacier advances in Lago Fagnano (54°S), southernmost Patagonia |
title_short |
Geophysical evidence of multiple glacier advances in Lago Fagnano (54°S), southernmost Patagonia |
title_full |
Geophysical evidence of multiple glacier advances in Lago Fagnano (54°S), southernmost Patagonia |
title_fullStr |
Geophysical evidence of multiple glacier advances in Lago Fagnano (54°S), southernmost Patagonia |
title_full_unstemmed |
Geophysical evidence of multiple glacier advances in Lago Fagnano (54°S), southernmost Patagonia |
title_sort |
geophysical evidence of multiple glacier advances in lago fagnano (54°s), southernmost patagonia |
publisher |
Elsevier |
publishDate |
2010 |
url |
https://doi.org/10.1016/j.quascirev.2010.01.016 |
genre |
Antarc* Antarctica Tierra del Fuego |
genre_facet |
Antarc* Antarctica Tierra del Fuego |
op_relation |
Quaternary Science Reviews--Quat. Sci. Rev.--journals:2468--0277-3791 eawag:6357 journal id: journals:2468 issn: 0277-3791 ut: 000277813300010 local: 14440 scopus: 2-s2.0-77950594124 doi:10.1016/j.quascirev.2010.01.016 |
op_doi |
https://doi.org/10.1016/j.quascirev.2010.01.016 |
container_title |
Quaternary Science Reviews |
container_volume |
29 |
container_issue |
9-10 |
container_start_page |
1188 |
op_container_end_page |
1200 |
_version_ |
1810493635604512768 |