Climate, dust, and fire across the Eocene-Oligocene transition, Patagonia
The Eocene-Oligocene transition (EOT) is typically interpreted as a time of drastic global cooling and drying associated with massive growth of a glacial icecap in Antarctica and the shift to an "icehouse" climate. The effects of this transition on the terrestrial environments, floras, and...
Published in: | Geology |
---|---|
Main Authors: | , , , , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
Geological Society of America
|
Subjects: | |
Online Access: | http://hdl.handle.net/11336/78364 |
id |
ftconicet:oai:ri.conicet.gov.ar:11336/78364 |
---|---|
record_format |
openpolar |
spelling |
ftconicet:oai:ri.conicet.gov.ar:11336/78364 2023-10-09T21:47:05+02:00 Climate, dust, and fire across the Eocene-Oligocene transition, Patagonia Selking, Peter A. Stromberg, Caroline Dunn, Regan Khon, Matthew J. Carlini, Alfredo Armando Davies-Vollum, K. Siân Madden, Richard H. application/pdf http://hdl.handle.net/11336/78364 eng eng Geological Society of America info:eu-repo/semantics/altIdentifier/doi/10.1130/G36664.1 info:eu-repo/semantics/altIdentifier/url/https://pubs.geoscienceworld.org/gsa/geology/article/43/7/567/131882/Climate-dust-and-fire-across-the-EoceneOligocene http://hdl.handle.net/11336/78364 Selking, Peter A.; Stromberg, Caroline; Dunn, Regan; Khon, Matthew J.; Carlini, Alfredo Armando; et al.; Climate, dust, and fire across the Eocene-Oligocene transition, Patagonia; Geological Society of America; Geology; 43; 7; 5-2015; 567-570 0091-7613 CONICET Digital CONICET info:eu-repo/semantics/openAccess https://creativecommons.org/licenses/by-nc-sa/2.5/ar/ Paleo Climate Dust Eot Patagonia https://purl.org/becyt/ford/1.5 https://purl.org/becyt/ford/1 info:eu-repo/semantics/article info:ar-repo/semantics/artículo info:eu-repo/semantics/publishedVersion ftconicet https://doi.org/10.1130/G36664.1 2023-09-24T18:19:22Z The Eocene-Oligocene transition (EOT) is typically interpreted as a time of drastic global cooling and drying associated with massive growth of a glacial icecap in Antarctica and the shift to an "icehouse" climate. The effects of this transition on the terrestrial environments, floras, and faunas of the Southern Hemisphere, however, have been unclear. Here we document simultaneous changes in fire regime and plant community in Patagonia, Argentina. Decreases in the concentration of magnetite in loessites from the Eocene-Oligocene Vera Member of the Sarmiento Formation correlate with decreases in the fraction of burnt palm phytoliths as well as more consistently palm-dominated phytolith assemblages. Association of magnetite and burnt palm phytoliths suggests intense wildfires, which appear to have been suppressed for ~200 k.y. shortly after the EOT. The disappearance of fire-related characteristics near the EOT is possible if changes in regional wind patterns-consistent with observed changes in sediment particle sizes-caused changes in seasonal precipitation. These results imply a more important role for fire in structuring Eocene-Oligocene landscapes than previously thought. Fil: Selking, Peter A. University of Washington; Estados Unidos Fil: Stromberg, Caroline. University of Washington; Estados Unidos. Burke Museum of Natural History and Culture; Estados Unidos Fil: Dunn, Regan. University of Washington; Estados Unidos. Burke Museum of Natural History and Culture; Estados Unidos Fil: Khon, Matthew J. Boise State University; Estados Unidos Fil: Carlini, Alfredo Armando. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata; Argentina. Universidad Nacional de La Plata. Facultad de Ciencias Naturales y Museo. División Paleontología Vertebrados; Argentina Fil: Davies-Vollum, K. Siân. Sheffield Hallam University; Estados Unidos Fil: Madden, Richard H. University of Chicago; Estados Unidos Article in Journal/Newspaper Antarc* Antarctica CONICET Digital (Consejo Nacional de Investigaciones Científicas y Técnicas) Patagonia Argentina Sheffield Sarmiento ENVELOPE(-68.000,-68.000,-72.000,-72.000) Vollum ENVELOPE(8.530,8.530,62.771,62.771) Geology 43 7 567 570 |
institution |
Open Polar |
collection |
CONICET Digital (Consejo Nacional de Investigaciones Científicas y Técnicas) |
op_collection_id |
ftconicet |
language |
English |
topic |
Paleo Climate Dust Eot Patagonia https://purl.org/becyt/ford/1.5 https://purl.org/becyt/ford/1 |
spellingShingle |
Paleo Climate Dust Eot Patagonia https://purl.org/becyt/ford/1.5 https://purl.org/becyt/ford/1 Selking, Peter A. Stromberg, Caroline Dunn, Regan Khon, Matthew J. Carlini, Alfredo Armando Davies-Vollum, K. Siân Madden, Richard H. Climate, dust, and fire across the Eocene-Oligocene transition, Patagonia |
topic_facet |
Paleo Climate Dust Eot Patagonia https://purl.org/becyt/ford/1.5 https://purl.org/becyt/ford/1 |
description |
The Eocene-Oligocene transition (EOT) is typically interpreted as a time of drastic global cooling and drying associated with massive growth of a glacial icecap in Antarctica and the shift to an "icehouse" climate. The effects of this transition on the terrestrial environments, floras, and faunas of the Southern Hemisphere, however, have been unclear. Here we document simultaneous changes in fire regime and plant community in Patagonia, Argentina. Decreases in the concentration of magnetite in loessites from the Eocene-Oligocene Vera Member of the Sarmiento Formation correlate with decreases in the fraction of burnt palm phytoliths as well as more consistently palm-dominated phytolith assemblages. Association of magnetite and burnt palm phytoliths suggests intense wildfires, which appear to have been suppressed for ~200 k.y. shortly after the EOT. The disappearance of fire-related characteristics near the EOT is possible if changes in regional wind patterns-consistent with observed changes in sediment particle sizes-caused changes in seasonal precipitation. These results imply a more important role for fire in structuring Eocene-Oligocene landscapes than previously thought. Fil: Selking, Peter A. University of Washington; Estados Unidos Fil: Stromberg, Caroline. University of Washington; Estados Unidos. Burke Museum of Natural History and Culture; Estados Unidos Fil: Dunn, Regan. University of Washington; Estados Unidos. Burke Museum of Natural History and Culture; Estados Unidos Fil: Khon, Matthew J. Boise State University; Estados Unidos Fil: Carlini, Alfredo Armando. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata; Argentina. Universidad Nacional de La Plata. Facultad de Ciencias Naturales y Museo. División Paleontología Vertebrados; Argentina Fil: Davies-Vollum, K. Siân. Sheffield Hallam University; Estados Unidos Fil: Madden, Richard H. University of Chicago; Estados Unidos |
format |
Article in Journal/Newspaper |
author |
Selking, Peter A. Stromberg, Caroline Dunn, Regan Khon, Matthew J. Carlini, Alfredo Armando Davies-Vollum, K. Siân Madden, Richard H. |
author_facet |
Selking, Peter A. Stromberg, Caroline Dunn, Regan Khon, Matthew J. Carlini, Alfredo Armando Davies-Vollum, K. Siân Madden, Richard H. |
author_sort |
Selking, Peter A. |
title |
Climate, dust, and fire across the Eocene-Oligocene transition, Patagonia |
title_short |
Climate, dust, and fire across the Eocene-Oligocene transition, Patagonia |
title_full |
Climate, dust, and fire across the Eocene-Oligocene transition, Patagonia |
title_fullStr |
Climate, dust, and fire across the Eocene-Oligocene transition, Patagonia |
title_full_unstemmed |
Climate, dust, and fire across the Eocene-Oligocene transition, Patagonia |
title_sort |
climate, dust, and fire across the eocene-oligocene transition, patagonia |
publisher |
Geological Society of America |
url |
http://hdl.handle.net/11336/78364 |
long_lat |
ENVELOPE(-68.000,-68.000,-72.000,-72.000) ENVELOPE(8.530,8.530,62.771,62.771) |
geographic |
Patagonia Argentina Sheffield Sarmiento Vollum |
geographic_facet |
Patagonia Argentina Sheffield Sarmiento Vollum |
genre |
Antarc* Antarctica |
genre_facet |
Antarc* Antarctica |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1130/G36664.1 info:eu-repo/semantics/altIdentifier/url/https://pubs.geoscienceworld.org/gsa/geology/article/43/7/567/131882/Climate-dust-and-fire-across-the-EoceneOligocene http://hdl.handle.net/11336/78364 Selking, Peter A.; Stromberg, Caroline; Dunn, Regan; Khon, Matthew J.; Carlini, Alfredo Armando; et al.; Climate, dust, and fire across the Eocene-Oligocene transition, Patagonia; Geological Society of America; Geology; 43; 7; 5-2015; 567-570 0091-7613 CONICET Digital CONICET |
op_rights |
info:eu-repo/semantics/openAccess https://creativecommons.org/licenses/by-nc-sa/2.5/ar/ |
op_doi |
https://doi.org/10.1130/G36664.1 |
container_title |
Geology |
container_volume |
43 |
container_issue |
7 |
container_start_page |
567 |
op_container_end_page |
570 |
_version_ |
1779309827394109440 |