Late Cretaceous paleogeography of the Antarctic Peninsula: New paleomagnetic pole from the James Ross Basin

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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 demagnetizatio...

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Autor principal: Milanese, F.
Otros Autores: Rapalini, A., Slotznick, S.P, Tobin, T.S, Kirschvink, J., Olivero, E.
Formato: Capítulo de libro
Lenguaje:Inglés
Publicado: Elsevier Ltd 2019
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Biblioteca Central Dr. Luis F. Leloir (FCEN) de Universidad de Buenos Aires
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100 1 |a Milanese, F. 
245 1 0 |a Late Cretaceous paleogeography of the Antarctic Peninsula: New paleomagnetic pole from the James Ross Basin 
260 |b Elsevier Ltd  |c 2019 
270 1 0 |m Milanese, F.; Instituto de Geociencias Básicas, Aplicadas y Ambientales de Buenos Aires (IGEBA), CONICET, Universidad de Buenos AiresArgentina; email: fnmilanese@gl.fcen.uba.ar 
506 |2 openaire  |e Política editorial 
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520 3 |a 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 from South America. © 2019 Elsevier Ltd  |l eng 
536 |a Detalles de la financiación: Office of Polar Programs 
536 |a Detalles de la financiación: National Science Foundation, 1341729, 0739541 
536 |a Detalles de la financiación: California Institute of Technology, Caltech 
536 |a Detalles de la financiación: To the Instituto Antártico Argentino for the logistic support during the Antarctic field seasons, and the NSF Office of Polar Programs (NSF grant 1341729 to JLK, #0739541 ) for support of the laboratory work at Caltech. Grants from ANPCyT ( PICTO 2010-0114 to E. Olivero) and Universidad de Buenos Aires ( UBACyT 20020130100465BA to A. Rapalini) provided additional support for this research. Constructive comments from to anonymous reviewers helped us to improve the final version of the manuscript. 
593 |a Instituto de Geociencias Básicas, Aplicadas y Ambientales de Buenos Aires (IGEBA), CONICET, Universidad de Buenos Aires, Argentina 
593 |a University of California, Berkeley, Berkeley, CA 94720, United States 
593 |a University of Alabama, Tuscaloosa, AL, United States 
593 |a Division of Geological and Planetary Sciences, California Institute of Techonoly, Pasadena, CA, United States 
593 |a Earth-Life Science Institute, Tokyo Institute of Technology, Meguro, Tokyo, Japan 
593 |a CADIC, CONICET, Bernardo Houssay 200, Ushuaia, 9410, Argentina 
690 1 0 |a APPARENT POLAR WANDER PATH 
690 1 0 |a GUSTAV GROUP 
690 1 0 |a MARAMBIO GROUP 
690 1 0 |a PALEOMAGNETISM 
690 1 0 |a APPARENT POLAR WANDER PATH 
690 1 0 |a CRETACEOUS 
690 1 0 |a MAGNETIC FIELD 
690 1 0 |a MAGNETIZATION 
690 1 0 |a PALEOGEOGRAPHY 
690 1 0 |a PALEOMAGNETISM 
690 1 0 |a ANTARCTIC PENINSULA 
690 1 0 |a ANTARCTICA 
690 1 0 |a JAMES ROSS ISLAND 
690 1 0 |a WEST ANTARCTICA 
700 1 |a Rapalini, A. 
700 1 |a Slotznick, S.P. 
700 1 |a Tobin, T.S. 
700 1 |a Kirschvink, J. 
700 1 |a Olivero, E. 
773 0 |d Elsevier Ltd, 2019  |g v. 91  |h pp. 131-143  |p J. South Am. Earth Sci.  |x 08959811  |w (AR-BaUEN)CENRE-1080  |t Journal of South American Earth Sciences 
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