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Abstract:

A paleomagnetic study from the earliest Paleocene Cerros de Montecristo Quartz Monzonite and its Jurassic to uppermost Cretaceous host rock (northern Chile, ∼22°S) provided high-temperature, high-coercivity magnetizations of dominantly reversed polarity. The remanences of the tilted host rock gave a negative fold-test and are indistinguishable from the remanences found in the pluton, indicating that the uppermost Cretaceous rocks underwent deformation before intrusion of the earliest Paleocene pluton, thus documenting a K-T deformation at the locality. Although this deformation may be another product of typical subduction-related noncollisional tectonics in the Central Andes, an alternative hypothesis, permitted by plate reconstructions, is that the event was associated with collision of an oceanic plate boundary. This latter hypothesis may also provide a context for several other tectonic events from northern Chile to the Patagonian Andes, wherein deformation would the consequence of a southward migrating triple junction between the latest Maastrichtian and Early Eocene. © 2012 Elsevier Ltd.

Registro:

Documento: Artículo
Título:Paleomagnetic evidence of earliest Paleocene deformation in Calama (∼22°S), northern Chile: Andean-type or ridge-collision tectonics?
Autor:Somoza, R.; Tomlinson, A.J.; Caffe, P.J.; Vilas, J.F.
Filiación:Departamento de Ciencias Geoógicas, FCEyN, Universidad de Buenos Aires, Argentina
IGEBA-CONICET, Argentina
Servicio Nacional de Geología y Minería de Chile, Chile
Instituto de Geología y Minería, Universidad Nacional de Jujuy, Argentina
Palabras clave:Central Andes; Earliest Paleocene deformation; Northern Chile; Ridge-collision; Andean orogeny; collision zone; Cretaceous; deformation mechanism; Eocene; host rock; hypothesis testing; Maastrichtian; magnetic reversal; oceanic lithosphere; Paleocene; paleomagnetism; plate boundary; pluton; remanent magnetization; tectonic reconstruction; tectonic setting; triple junction; Antofagasta; Calama; Chile
Año:2012
Volumen:37
Página de inicio:208
Página de fin:213
DOI: http://dx.doi.org/10.1016/j.jsames.2012.04.001
Título revista:Journal of South American Earth Sciences
Título revista abreviado:J. South Am. Earth Sci.
ISSN:08959811
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_08959811_v37_n_p208_Somoza

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Citas:

---------- APA ----------
Somoza, R., Tomlinson, A.J., Caffe, P.J. & Vilas, J.F. (2012) . Paleomagnetic evidence of earliest Paleocene deformation in Calama (∼22°S), northern Chile: Andean-type or ridge-collision tectonics?. Journal of South American Earth Sciences, 37, 208-213.
http://dx.doi.org/10.1016/j.jsames.2012.04.001
---------- CHICAGO ----------
Somoza, R., Tomlinson, A.J., Caffe, P.J., Vilas, J.F. "Paleomagnetic evidence of earliest Paleocene deformation in Calama (∼22°S), northern Chile: Andean-type or ridge-collision tectonics?" . Journal of South American Earth Sciences 37 (2012) : 208-213.
http://dx.doi.org/10.1016/j.jsames.2012.04.001
---------- MLA ----------
Somoza, R., Tomlinson, A.J., Caffe, P.J., Vilas, J.F. "Paleomagnetic evidence of earliest Paleocene deformation in Calama (∼22°S), northern Chile: Andean-type or ridge-collision tectonics?" . Journal of South American Earth Sciences, vol. 37, 2012, pp. 208-213.
http://dx.doi.org/10.1016/j.jsames.2012.04.001
---------- VANCOUVER ----------
Somoza, R., Tomlinson, A.J., Caffe, P.J., Vilas, J.F. Paleomagnetic evidence of earliest Paleocene deformation in Calama (∼22°S), northern Chile: Andean-type or ridge-collision tectonics?. J. South Am. Earth Sci. 2012;37:208-213.
http://dx.doi.org/10.1016/j.jsames.2012.04.001