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Abstract:

On the Argentine Puna two phases of deformation, Late Tertiary and Quaternary, are recognized. Studies of Nazca-South American plate motions indicate convergence towards 77° ± 12° since 10 Ma. Although Tertiary shortening is not parallel to this direction, Quaternary shortening concides with it. This situation could be explained by: a) the stress causing the faults changed direction during the Late Cenozoic, or b) the zone containing the older faults was rotated about a vertical axis. Isacks' model for the Bolivian orocline predicts a clockwise regional rotation for the southern limb. Although the model is probably oversimplified, it provides a testable hypothesis. Apalaeomagnetic study, to determine regional or local vertical axis rotations was carried out between 24° 30' and 24° 40' S and 67° 00' and 67° 15' W. Different demagnetization techniques were applied. Most specimens show a multicomponent behavior, although it was possible to isolate pretectonic primary remanent magnetizations that indicate clockwise rotations of approximately 10°-15° of magnitude.

Registro:

Documento: Artículo
Título:Palaeomagnetic study of Tertiary sedimentary rocks from Puna Salteña: Determination of clockwise rotations
Autor:Prezzi, C.B.; Vilas, J.F.A.; Sinito, A.M.
Filiación:Lab. Paleomagnetismo Daniel Valencio, Depto. de Ciencias Geológicas, Universidad de Buenos Aires, Ciudad Universitaria, 1428 Buenos Aires, Argentina
Univ. Nac. Ctro. Prov. Buenos Aires, Facultad de Ciencias Exactas, IFAS, 7000 Tandil, Argentina
Palabras clave:block rotation; palaeomagnetism; Tertiary; Argentina
Año:1996
Volumen:51
Número:3
Página de inicio:261
Página de fin:273
Título revista:Revista de la Asociacion Geologica Argentina
Título revista abreviado:Rev. Asoc. Geol. Argent.
ISSN:00044822
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00044822_v51_n3_p261_Prezzi

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Citas:

---------- APA ----------
Prezzi, C.B., Vilas, J.F.A. & Sinito, A.M. (1996) . Palaeomagnetic study of Tertiary sedimentary rocks from Puna Salteña: Determination of clockwise rotations . Revista de la Asociacion Geologica Argentina, 51(3), 261-273.
Recuperado de https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00044822_v51_n3_p261_Prezzi [ ]
---------- CHICAGO ----------
Prezzi, C.B., Vilas, J.F.A., Sinito, A.M. "Palaeomagnetic study of Tertiary sedimentary rocks from Puna Salteña: Determination of clockwise rotations " . Revista de la Asociacion Geologica Argentina 51, no. 3 (1996) : 261-273.
Recuperado de https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00044822_v51_n3_p261_Prezzi [ ]
---------- MLA ----------
Prezzi, C.B., Vilas, J.F.A., Sinito, A.M. "Palaeomagnetic study of Tertiary sedimentary rocks from Puna Salteña: Determination of clockwise rotations " . Revista de la Asociacion Geologica Argentina, vol. 51, no. 3, 1996, pp. 261-273.
Recuperado de https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00044822_v51_n3_p261_Prezzi [ ]
---------- VANCOUVER ----------
Prezzi, C.B., Vilas, J.F.A., Sinito, A.M. Palaeomagnetic study of Tertiary sedimentary rocks from Puna Salteña: Determination of clockwise rotations . Rev. Asoc. Geol. Argent. 1996;51(3):261-273.
Available from: https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00044822_v51_n3_p261_Prezzi [ ]