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Problems of endemism and diachronous extinctions make global correlation of coeval strata in the mid Campanian-Maastrichtian of the James Ross Basin problematic. To provide a more precise chronological framework, we present two magnetostratigraphies of Campanian strata from the Rabot Formation that crops out at Hamilton Norte (200 m thick) and Redonda Point (340 m thick) in James Ross Island. Sampled sections consist of poorly-consolidated, drab-colored fine sandstones and mudstones. Bulk susceptibility logs of both sections show a similar pattern of relatively low values at the lower and upper levels with significantly higher values at mid-levels that confirms the lithostratigraphic correlation between sections. Rock magnetic studies suggest that this change is not attributable to a ferrimagnetic fraction but to a paramagnetic contribution of presumed detrital origin. Stepwise thermal demagnetization showed dominant unblocking temperatures higher than 400 °C. Progressive hybrid low-temperature cycling, low-field AF and thermal demagnetization in a controlled N2 atmosphere, reveals a two-polarity characteristic component of possible primary origin. Rock magnetic experiments suggest that detrital titano-magnetite is the most likely remanence carrier. Anisotropy of magnetic susceptibility results show sedimentary fabrics, indicating that beds were not significantly buried or compacted. Magnetostratigraphies produced at each locality demonstrate a consistent change from reverse to normal polarity remanence in the middle of the sections. Biostratigraphic constraints identify this reversal as the C33r/C33n transition, indicating a 79.90 Ma depositional age for this level of the Rabot Formation. The remanence directions yield a mean whose corresponding paleopole is consistent with two recently obtained Upper Cretaceous reference paleopoles for the Antarctic Peninsula. Our data support the lack of tectonic rotation or oroclinal bending of this region since the Late Cretaceous. © 2016 Elsevier Ltd


Documento: Artículo
Título:Magnetostratigraphy of the Rabot Formation, Upper Cretaceous, James Ross Basin, Antarctic Peninsula
Autor:Milanese, F.N.; Olivero, E.B.; Kirschvink, J.L.; Rapalini, A.E.
Filiación:Universidad de Buenos Aires, Facultad de Ciencias Exactas y Naturales, Departamento de Cs. Geológicas, Instituto de Geociencias Básicas, Aplicadas y Ambientales de Buenos Aires (IGEBA-CONICET), Ciudad Universitaria, Intendente Güiraldes 2160, Buenos Aires, 1428, Argentina
Centro Austral de Investigaciones Científicas (CADIC-CONICET), B. Houssay 200, Ushuaia, Tierra del Fuego 9140, Argentina
Division of Geological & Planetary Sciences, California Institute of Technology, Pasadena, CA 91125, United States
Earth-Life Science Institute, Tokyo Institute of Technology, Meguro, Japan
Palabras clave:Antarctica; James Ross Basin; Magnetostratigraphy; Paleomagnetism; Rabot Formation; Upper Cretaceous; basin analysis; Campanian; demagnetization; lithostratigraphy; magnetic anisotropy; magnetostratigraphy; paleomagnetism; Antarctic Peninsula; Antarctica; James Ross Island; West Antarctica
Página de inicio:172
Página de fin:187
Título revista:Cretaceous Research
Título revista abreviado:Cretaceous Res.


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---------- APA ----------
Milanese, F.N., Olivero, E.B., Kirschvink, J.L. & Rapalini, A.E. (2017) . Magnetostratigraphy of the Rabot Formation, Upper Cretaceous, James Ross Basin, Antarctic Peninsula. Cretaceous Research, 72, 172-187.
---------- CHICAGO ----------
Milanese, F.N., Olivero, E.B., Kirschvink, J.L., Rapalini, A.E. "Magnetostratigraphy of the Rabot Formation, Upper Cretaceous, James Ross Basin, Antarctic Peninsula" . Cretaceous Research 72 (2017) : 172-187.
---------- MLA ----------
Milanese, F.N., Olivero, E.B., Kirschvink, J.L., Rapalini, A.E. "Magnetostratigraphy of the Rabot Formation, Upper Cretaceous, James Ross Basin, Antarctic Peninsula" . Cretaceous Research, vol. 72, 2017, pp. 172-187.
---------- VANCOUVER ----------
Milanese, F.N., Olivero, E.B., Kirschvink, J.L., Rapalini, A.E. Magnetostratigraphy of the Rabot Formation, Upper Cretaceous, James Ross Basin, Antarctic Peninsula. Cretaceous Res. 2017;72:172-187.