Late Cretaceous paleogeography of the Antarctic Peninsula: New paleomagnetic pole from the James Ross Basin
Two paleomagnetic poles of 80 and 75 Ma have been computed from 191 to 123 paleomagnetic samples, respectively, of the marine sedimentary units of the Upper Cretaceous Marambio Group exposed in the James Ross Island, Antarctic Peninsula. Paleomagnetic behaviors during stepwise thermal demagnetizat...
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Online Access: | https://doi.org/10.1016/j.jsames.2019.01.012 |
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ftcaltechauth:oai:authors.library.caltech.edu:wb8m9-zen80 2024-10-20T14:03:58+00:00 Late Cretaceous paleogeography of the Antarctic Peninsula: New paleomagnetic pole from the James Ross Basin Milanese, Florencia Rapalini, Augusto Slotznick, Sarah P. Tobin, Thomas S. Kirschvink, Joseph Olivero, Eduardo 2019-04 https://doi.org/10.1016/j.jsames.2019.01.012 unknown Elsevier https://doi.org/10.1016/j.jsames.2019.01.012 eprintid:96574 info:eu-repo/semantics/closedAccess Other Journal of South American Earth Sciences, 91, 131-143, (2019-04) Paleomagnetism Apparent polar wander path Marambio group Gustav group info:eu-repo/semantics/article 2019 ftcaltechauth https://doi.org/10.1016/j.jsames.2019.01.012 2024-09-25T18:46:37Z Two paleomagnetic poles of 80 and 75 Ma have been computed from 191 to 123 paleomagnetic samples, respectively, of the marine sedimentary units of the Upper Cretaceous Marambio Group exposed in the James Ross Island, Antarctic Peninsula. Paleomagnetic behaviors during stepwise thermal demagnetization and rock magnetic analyses indicate that magnetization is likely primary and carried by SD-PSD detrital titanomagnetite. Application of an inclination shallowing correction by the elongation-inclination method yielded a significant inclination shallowing affecting the older (ca. 80 Ma) succession exposed in the northwest area of the island. However, the paleomagnetic directions computed from the younger (ca. 75 Ma) succession outcropping in the southeast corner of the island yielded an indeterminate result using the same analysis. The inclination shallowing-corrected 80 Ma paleopole position plus previous ones of ca.110, 90 and 55 Ma were used to construct the Apparent Polar Wander Path (APWP) for the Antarctic Peninsula during the Late Cretaceous-Paleocene. This path confirms that oroclinal bending of the Antarctic Peninsula as well as relative displacement with respect to East Antarctica are negligible since 110 Ma. Comparison with the apparent polar wander path for South America for the 130-45 Ma period suggests that this continent and the Antarctic Peninsula kept a very similar relative paleogeographic position since 110 Ma until 55 Ma, which likely meant a physical link between both continental masses. During that period, both continents underwent a relatively fast southward displacement of around 7° and a clockwise rotation relative to the Earth spin axis that can be bracketed between around 100 and 90 Ma. Oroclinal bending of the Fuegian Andes was likely due to tectonic interactions between the Patagonian-Fuegian Andes and the Antarctic Peninsula promoted, at least partially, by such displacements. By 55 Ma the Antarctic Peninsula probably was starting or about to start its final separation ... Article in Journal/Newspaper Antarc* Antarctic Antarctic Peninsula Antarctica East Antarctica James Ross Island Ross Island Caltech Authors (California Institute of Technology) Antarctic Antarctic Peninsula East Antarctica Marambio ENVELOPE(-56.750,-56.750,-64.283,-64.283) Ross Island The Antarctic Journal of South American Earth Sciences 91 131 143 |
institution |
Open Polar |
collection |
Caltech Authors (California Institute of Technology) |
op_collection_id |
ftcaltechauth |
language |
unknown |
topic |
Paleomagnetism Apparent polar wander path Marambio group Gustav group |
spellingShingle |
Paleomagnetism Apparent polar wander path Marambio group Gustav group Milanese, Florencia Rapalini, Augusto Slotznick, Sarah P. Tobin, Thomas S. Kirschvink, Joseph Olivero, Eduardo Late Cretaceous paleogeography of the Antarctic Peninsula: New paleomagnetic pole from the James Ross Basin |
topic_facet |
Paleomagnetism Apparent polar wander path Marambio group Gustav group |
description |
Two paleomagnetic poles of 80 and 75 Ma have been computed from 191 to 123 paleomagnetic samples, respectively, of the marine sedimentary units of the Upper Cretaceous Marambio Group exposed in the James Ross Island, Antarctic Peninsula. Paleomagnetic behaviors during stepwise thermal demagnetization and rock magnetic analyses indicate that magnetization is likely primary and carried by SD-PSD detrital titanomagnetite. Application of an inclination shallowing correction by the elongation-inclination method yielded a significant inclination shallowing affecting the older (ca. 80 Ma) succession exposed in the northwest area of the island. However, the paleomagnetic directions computed from the younger (ca. 75 Ma) succession outcropping in the southeast corner of the island yielded an indeterminate result using the same analysis. The inclination shallowing-corrected 80 Ma paleopole position plus previous ones of ca.110, 90 and 55 Ma were used to construct the Apparent Polar Wander Path (APWP) for the Antarctic Peninsula during the Late Cretaceous-Paleocene. This path confirms that oroclinal bending of the Antarctic Peninsula as well as relative displacement with respect to East Antarctica are negligible since 110 Ma. Comparison with the apparent polar wander path for South America for the 130-45 Ma period suggests that this continent and the Antarctic Peninsula kept a very similar relative paleogeographic position since 110 Ma until 55 Ma, which likely meant a physical link between both continental masses. During that period, both continents underwent a relatively fast southward displacement of around 7° and a clockwise rotation relative to the Earth spin axis that can be bracketed between around 100 and 90 Ma. Oroclinal bending of the Fuegian Andes was likely due to tectonic interactions between the Patagonian-Fuegian Andes and the Antarctic Peninsula promoted, at least partially, by such displacements. By 55 Ma the Antarctic Peninsula probably was starting or about to start its final separation ... |
format |
Article in Journal/Newspaper |
author |
Milanese, Florencia Rapalini, Augusto Slotznick, Sarah P. Tobin, Thomas S. Kirschvink, Joseph Olivero, Eduardo |
author_facet |
Milanese, Florencia Rapalini, Augusto Slotznick, Sarah P. Tobin, Thomas S. Kirschvink, Joseph Olivero, Eduardo |
author_sort |
Milanese, Florencia |
title |
Late Cretaceous paleogeography of the Antarctic Peninsula: New paleomagnetic pole from the James Ross Basin |
title_short |
Late Cretaceous paleogeography of the Antarctic Peninsula: New paleomagnetic pole from the James Ross Basin |
title_full |
Late Cretaceous paleogeography of the Antarctic Peninsula: New paleomagnetic pole from the James Ross Basin |
title_fullStr |
Late Cretaceous paleogeography of the Antarctic Peninsula: New paleomagnetic pole from the James Ross Basin |
title_full_unstemmed |
Late Cretaceous paleogeography of the Antarctic Peninsula: New paleomagnetic pole from the James Ross Basin |
title_sort |
late cretaceous paleogeography of the antarctic peninsula: new paleomagnetic pole from the james ross basin |
publisher |
Elsevier |
publishDate |
2019 |
url |
https://doi.org/10.1016/j.jsames.2019.01.012 |
long_lat |
ENVELOPE(-56.750,-56.750,-64.283,-64.283) |
geographic |
Antarctic Antarctic Peninsula East Antarctica Marambio Ross Island The Antarctic |
geographic_facet |
Antarctic Antarctic Peninsula East Antarctica Marambio Ross Island The Antarctic |
genre |
Antarc* Antarctic Antarctic Peninsula Antarctica East Antarctica James Ross Island Ross Island |
genre_facet |
Antarc* Antarctic Antarctic Peninsula Antarctica East Antarctica James Ross Island Ross Island |
op_source |
Journal of South American Earth Sciences, 91, 131-143, (2019-04) |
op_relation |
https://doi.org/10.1016/j.jsames.2019.01.012 eprintid:96574 |
op_rights |
info:eu-repo/semantics/closedAccess Other |
op_doi |
https://doi.org/10.1016/j.jsames.2019.01.012 |
container_title |
Journal of South American Earth Sciences |
container_volume |
91 |
container_start_page |
131 |
op_container_end_page |
143 |
_version_ |
1813450836014006272 |