IGEBA   23946
INSTITUTO DE GEOCIENCIAS BASICAS, APLICADAS Y AMBIENTALES DE BUENOS AIRES
Unidad Ejecutora - UE
congresos y reuniones científicas
Título:
ABSOLUTE AGES OF MARINE SEDIMENTARY STRATA FROM JAMES ROSS BASIN
Autor/es:
OLIVERO, EDUARDO; GALLO, LEANDRO; MILANESE, FLORENCIA; KIRSCHVINK, JOSEPH; RAPALINI, AUGUSTO E.; FRANCESCHINIS, PABLO R.
Lugar:
Querétaro
Reunión:
Congreso; LatinMag 2017; 2017
Institución organizadora:
Asociación Latinoamericana de Paleomagnetismo y Geomagnetismo
Resumen:
A magnetostratigraphic study was carried out in the SE sector of the James Ross Basin (Antarctica).The magnetostratigraphy was obtained along five cross-sections, three of them located in the SEsector of James Ross Island and two in Snow Hill Island. They belong to the upper part of thedeep marine sedimentary succession that constitutes the Marambio Group (Upper Cretaceous).Ammonite assemblages give the main chronological reference framework. Even though the fossilcontent is abundant, endemism and diachronic extinctions are the main problems in the definitionof a precise age framework and global correlations for the Upper Cretaceous units. In this scenario,the magnetostratigraphy provides the required chronological resolution for the global correlationproblems of James Ross Basin, identifying seven geomagnetic polarity reversals and obtainingan absolute age constraint for the whole succession between 74.309 Ma (Middle Campanian) to71.449 Ma (Early Maastrichtian).