The origin of oriented lakes: evidence from the Bolivian Amazon
The presence of hundreds of rectangular and oriented lakes is one of the most striking characteristics of the Llanos de Moxos (LM) landscape in the Bolivian Amazon. Oriented lakes also occur in the Arctic coastal plains of Russia, Alaska and Canada and along the Atlantic Coastal Plain from northeast...
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Elsevier Science
2014
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ftunivbern:oai:boris.unibe.ch:52413 2023-08-20T04:04:40+02:00 The origin of oriented lakes: evidence from the Bolivian Amazon Lombardo, Umberto Veit, Heinz 2014-01 application/pdf https://boris.unibe.ch/52413/1/1-s2.0-S0169555X13004340-main.pdf https://boris.unibe.ch/52413/ eng eng Elsevier Science https://boris.unibe.ch/52413/ info:eu-repo/semantics/restrictedAccess Lombardo, Umberto; Veit, Heinz (2014). The origin of oriented lakes: evidence from the Bolivian Amazon. Geomorphology, 204, pp. 502-509. Elsevier Science 10.1016/j.geomorph.2013.08.029 <http://dx.doi.org/10.1016/j.geomorph.2013.08.029> 910 Geography & travel info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion PeerReviewed 2014 ftunivbern https://doi.org/10.1016/j.geomorph.2013.08.029 2023-07-31T21:08:52Z The presence of hundreds of rectangular and oriented lakes is one of the most striking characteristics of the Llanos de Moxos (LM) landscape in the Bolivian Amazon. Oriented lakes also occur in the Arctic coastal plains of Russia, Alaska and Canada and along the Atlantic Coastal Plain from northeast Florida to southeast New Jersey and along the coast of northeast Brazil. Many different mechanisms have been proposed for their formation. In the LM, Plafker's (1964) tectonic model, in which subsidence results from the propagation of bedrock faults through the foreland sediments, is the most accepted. However, this model has not been verified. Here, we present new results from stratigraphic transects across the borders of three rectangular and oriented lakes in the LM. A paleosol buried under mid-Holocene sediments is used as a stratigraphic marker to assess the vertical displacement of sediments on both sides of the alleged faults. Our results show that there is no vertical displacement and, therefore, that Plafker's model can be ruled out. We suggest that, among all the proposed mechanisms behind lake formation, the combined action of wind and waves is the most likely. The evidence from the LM provides new hints for the formation of oriented lakes worldwide. Article in Journal/Newspaper Arctic Alaska BORIS (Bern Open Repository and Information System, University of Bern) Arctic Canada Geomorphology 204 502 509 |
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Open Polar |
collection |
BORIS (Bern Open Repository and Information System, University of Bern) |
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ftunivbern |
language |
English |
topic |
910 Geography & travel |
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910 Geography & travel Lombardo, Umberto Veit, Heinz The origin of oriented lakes: evidence from the Bolivian Amazon |
topic_facet |
910 Geography & travel |
description |
The presence of hundreds of rectangular and oriented lakes is one of the most striking characteristics of the Llanos de Moxos (LM) landscape in the Bolivian Amazon. Oriented lakes also occur in the Arctic coastal plains of Russia, Alaska and Canada and along the Atlantic Coastal Plain from northeast Florida to southeast New Jersey and along the coast of northeast Brazil. Many different mechanisms have been proposed for their formation. In the LM, Plafker's (1964) tectonic model, in which subsidence results from the propagation of bedrock faults through the foreland sediments, is the most accepted. However, this model has not been verified. Here, we present new results from stratigraphic transects across the borders of three rectangular and oriented lakes in the LM. A paleosol buried under mid-Holocene sediments is used as a stratigraphic marker to assess the vertical displacement of sediments on both sides of the alleged faults. Our results show that there is no vertical displacement and, therefore, that Plafker's model can be ruled out. We suggest that, among all the proposed mechanisms behind lake formation, the combined action of wind and waves is the most likely. The evidence from the LM provides new hints for the formation of oriented lakes worldwide. |
format |
Article in Journal/Newspaper |
author |
Lombardo, Umberto Veit, Heinz |
author_facet |
Lombardo, Umberto Veit, Heinz |
author_sort |
Lombardo, Umberto |
title |
The origin of oriented lakes: evidence from the Bolivian Amazon |
title_short |
The origin of oriented lakes: evidence from the Bolivian Amazon |
title_full |
The origin of oriented lakes: evidence from the Bolivian Amazon |
title_fullStr |
The origin of oriented lakes: evidence from the Bolivian Amazon |
title_full_unstemmed |
The origin of oriented lakes: evidence from the Bolivian Amazon |
title_sort |
origin of oriented lakes: evidence from the bolivian amazon |
publisher |
Elsevier Science |
publishDate |
2014 |
url |
https://boris.unibe.ch/52413/1/1-s2.0-S0169555X13004340-main.pdf https://boris.unibe.ch/52413/ |
geographic |
Arctic Canada |
geographic_facet |
Arctic Canada |
genre |
Arctic Alaska |
genre_facet |
Arctic Alaska |
op_source |
Lombardo, Umberto; Veit, Heinz (2014). The origin of oriented lakes: evidence from the Bolivian Amazon. Geomorphology, 204, pp. 502-509. Elsevier Science 10.1016/j.geomorph.2013.08.029 <http://dx.doi.org/10.1016/j.geomorph.2013.08.029> |
op_relation |
https://boris.unibe.ch/52413/ |
op_rights |
info:eu-repo/semantics/restrictedAccess |
op_doi |
https://doi.org/10.1016/j.geomorph.2013.08.029 |
container_title |
Geomorphology |
container_volume |
204 |
container_start_page |
502 |
op_container_end_page |
509 |
_version_ |
1774715039863799808 |