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Abstract:

A continental sequence of red beds and interbedded basaltic layers crops out in the Sierra Chica of Cordoba Province, Argentina (31.5°S, 64.4°W). This succession was deposited in a half-graben basin during the Early Cretaceous. We have carried out a palaeomagnetic survey on outcrops of this basin (147 sites in seven localities). From an analysis of IRM acquisition curves and detailed demagnetization behaviour, three different magnetic components are identified in the volcanic rocks: components A, B and X are carried by single- or pseudo-single-domain (titano) magnetite, haematite and multidomain magnetite, respectively. Component A is interpreted as a primary component of magnetization because it passes conglomerate, contact, tilt and reversal tests. The carrier of the primary magnetization, fine-grained (titano) magnetite, is present in basalts with a high degree of deuteric oxidation. This kind of oxidation is interpreted to have occurred during cooling. Components B and X are discarded because they are interpreted as recent magnetizations. In the sedimentary rocks, haematite and magnetite are identified as the carriers of remanence. Both minerals carry the same component, which passes a reversal test. The calculated palaeomagnetic pole, based on 55 sites, is Lat. 86.0°S, Long. 75.9°E (A95=3.3, K=35). This palaeomagnetic pole supersedes four with anomalous positions reported in previous papers.

Registro:

Documento: Artículo
Título:New Early Cretaceous palaeomagnetic pole from Cordoba Province (Argentina): Revision of previous studies and implications for the South American database
Autor:Geuna, S.E.; Vizán, H.
Filiación:Museo de Paleontología, Univ. National de Córdoba, Velez Sarsfield 299, (5000) Córdoba, Argentina
Laboratorio 'Daniel Valencio', Departamento de Ciencias Geologicas, Facultad de Cs. Exactas y Naturales, Pab. 2, (1428) Buenos Aires, Argentina
School of Earth Sciences, University of Birmingham Edgbaston, Birmingham B15 2TT, United Kingdom
Palabras clave:Argentina; Early Cretaceous; Palaeomagnetism; South America; apparent polar wander path; Cretaceous; paleomagnetism; South America
Año:1998
Volumen:135
Número:3
Página de inicio:1085
Página de fin:1100
DOI: http://dx.doi.org/10.1046/j.1365-246X.1998.00688.x
Título revista:Geophysical Journal International
Título revista abreviado:Geophys. J. Int.
ISSN:0956540X
PDF:https://bibliotecadigital.exactas.uba.ar/download/paper/paper_0956540X_v135_n3_p1085_Geuna.pdf
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_0956540X_v135_n3_p1085_Geuna

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Citas:

---------- APA ----------
Geuna, S.E. & Vizán, H. (1998) . New Early Cretaceous palaeomagnetic pole from Cordoba Province (Argentina): Revision of previous studies and implications for the South American database. Geophysical Journal International, 135(3), 1085-1100.
http://dx.doi.org/10.1046/j.1365-246X.1998.00688.x
---------- CHICAGO ----------
Geuna, S.E., Vizán, H. "New Early Cretaceous palaeomagnetic pole from Cordoba Province (Argentina): Revision of previous studies and implications for the South American database" . Geophysical Journal International 135, no. 3 (1998) : 1085-1100.
http://dx.doi.org/10.1046/j.1365-246X.1998.00688.x
---------- MLA ----------
Geuna, S.E., Vizán, H. "New Early Cretaceous palaeomagnetic pole from Cordoba Province (Argentina): Revision of previous studies and implications for the South American database" . Geophysical Journal International, vol. 135, no. 3, 1998, pp. 1085-1100.
http://dx.doi.org/10.1046/j.1365-246X.1998.00688.x
---------- VANCOUVER ----------
Geuna, S.E., Vizán, H. New Early Cretaceous palaeomagnetic pole from Cordoba Province (Argentina): Revision of previous studies and implications for the South American database. Geophys. J. Int. 1998;135(3):1085-1100.
http://dx.doi.org/10.1046/j.1365-246X.1998.00688.x