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Abstract:

Sedimentologic magnetofabric paleomagnetic studies were carried out on the early Ordovician La Pedrera Formation (Santa Victoria Group) in the Mojotoro Range Salta province. These studies aim at contributing to a better knowledge on the paleogeographic position of the Pampia block in the Early Paleozoic in relation to the Gondwana supercontinent. Oriented samples were collected from 12 sites distributed in three localities. These outcrops consist of middle to proximal shelf deposits of mainly quarzitic composition. Studies on the anisotropy of magnetic susceptibility (AMS) suggest a depositional fabric in one of these localities meanwhile some tectonic influence cannot be ruled out in the magnetic fabric found in the other two. The paleomagnetic analysis permitted to determine a characteristic magnetic remanence carried by hematite at all twelve sites. From the virtual geomagnetic poles computed at each site a paleomagnetic pole was obtained for the Santa Victoria Group at these localities which is located at 340,4°E 38,3°N A95=8,8°. This pole position suggests that any of the three localities underwent significant tectonic rotations due to the Andean orogeny or pre-vious tectonic events. However, it presents a somewhat lower than expected paleolatitude in comparison to coeval reference poles for Gondwana. Studies of oriented isothermal remanent magnetization suggest that this difference should not be due to inclination errors. On the other hand, the paleomagnetic pole for the Santa Victoria Group disagrees with those previously obtained for the middle to upper Cambrian Mesón Group and the lowermost Ordovician Santa Rosita Formation, to the north of our study localities but still in the same region. These discrepancies can be explained either by the presence of Andean local tectonic rotations around vertical axes in the localities to the north of our study zone or by considering that the hypothetical displacement of Pampia along the Río de la Plata craton margin was already over, or nearly so, by the Early Ordovician. © 2018, Asociacion Geologica Argentina. All rights reserved.

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Documento: Artículo
Título:Paleomagnestism of the Santa Victoria Group in the Mojotoro Range, Salta: Contributions to the paleogeographic position of Pampia in Early Paleozoic
Autor:Rodríguez Piceda, C.; Franceschinis, P.R.; Escayola, M.P.; Rapalini, A.E.
Filiación:Universidad de Buenos Aires, Instituto de Geociencias Básicas, Aplicadas y Ambientales de Buenos Aires, Departamento de Ciencias Geológicas, Facultad de Ciencias Exactas y Naturales, Argentina
Consejo Nacional de Investigaciones Científicas y Técnicas, Argentina
Universidad Nacional de Tierra del Fuego, Ushuaia, Argentina
Palabras clave:Gondwana; Mojotoro range; Paleomagnetism; Pampia; Santa victoria group; Rosita; victoria group
Año:2018
Volumen:75
Número:4
Página de inicio:518
Página de fin:532
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_v75_n4_p518_RodriguezPiceda

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Citas:

---------- APA ----------
Rodríguez Piceda, C., Franceschinis, P.R., Escayola, M.P. & Rapalini, A.E. (2018) . Paleomagnestism of the Santa Victoria Group in the Mojotoro Range, Salta: Contributions to the paleogeographic position of Pampia in Early Paleozoic . Revista de la Asociacion Geologica Argentina, 75(4), 518-532.
Recuperado de https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00044822_v75_n4_p518_RodriguezPiceda [ ]
---------- CHICAGO ----------
Rodríguez Piceda, C., Franceschinis, P.R., Escayola, M.P., Rapalini, A.E. "Paleomagnestism of the Santa Victoria Group in the Mojotoro Range, Salta: Contributions to the paleogeographic position of Pampia in Early Paleozoic " . Revista de la Asociacion Geologica Argentina 75, no. 4 (2018) : 518-532.
Recuperado de https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00044822_v75_n4_p518_RodriguezPiceda [ ]
---------- MLA ----------
Rodríguez Piceda, C., Franceschinis, P.R., Escayola, M.P., Rapalini, A.E. "Paleomagnestism of the Santa Victoria Group in the Mojotoro Range, Salta: Contributions to the paleogeographic position of Pampia in Early Paleozoic " . Revista de la Asociacion Geologica Argentina, vol. 75, no. 4, 2018, pp. 518-532.
Recuperado de https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00044822_v75_n4_p518_RodriguezPiceda [ ]
---------- VANCOUVER ----------
Rodríguez Piceda, C., Franceschinis, P.R., Escayola, M.P., Rapalini, A.E. Paleomagnestism of the Santa Victoria Group in the Mojotoro Range, Salta: Contributions to the paleogeographic position of Pampia in Early Paleozoic . Rev. Asoc. Geol. Argent. 2018;75(4):518-532.
Available from: https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00044822_v75_n4_p518_RodriguezPiceda [ ]