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Abstract:

Nico Pérez-Zapicán basic dykes swarm, Uruguay: radimetric and paleomagnetic evidence about their age The Nico Pérez-Zapicán basic dykes swarm intrudes the Paleoproterozoic basement of the Río de la Plata craton in the vecinity of the homonimous towns, Lavalleja department, Uruguay. From the identification and detailed mapping of the dykes, petrographic descriptions, and geochronologic, paleomagnetic and magnetofabric analysis, it was possible to characterize their geologic characteristics and temporal context in a more accurate way. Dykes present a high stability remanence, considered to be primary, which allowed us to calculate the Paleomagnetic Pole of the Nico Pérez basic dykes swarm, which is located at 87ºS; 197,3ºE (A95=10,2º, n=8, k=30,31), and is consistent with other reference poles of South America from middle to upper Jurassic. The petrofabric of the dykes was characterized by an analysis of the anisotropy of magnetic susceptibility, which resulted to be of magmatic origin. Normal and reverse fabrics were observed. The geochronologic analysis, based on an39Ar/40Ar dating on plagioclase, yielded a 157,6±3,0 Ma age for the intrusion of the dykes. Taking into account the geochronologic, petrographic and paleomagnetic evidence exposed in this work, we propose that the event that originated the intrusion of the Nico Pérez basic dykes swarm took place in Mesozoic times, probably associated with first tensional stresses that preceded the opening of the South Atlantic Ocean. © 2014, Asociacion Geologica Argentina. All rights reserved.

Registro:

Documento: Artículo
Título:Nico Pérez - Zapicán basic dykes swarm, Uruguay: radimetric and paleomagnetic evidence about their age
Autor:Lossada, A.C.; Rapalini, A.E.; Betucci, L.S.
Filiación:Departamento de Ciencias Geológicas, Universidad de Buenos Aires, Argentina
IGEBA Instituto de Geociencias Básicas, Aplicadas y Ambientales de Buenos Aires (IGEBA), Departamento de Ciencias Geológicas, Pabellón 2, Ciudad Universitaria, Buenos Aires, Argentina
Universidad de la República, Uruguay
Palabras clave:Basic dykes; Paleomagnetism; Río de la Plata craton; Uruguay; dike swarm; geochronology; magnetic fabric; paleomagnetism; petrography; Proterozoic; Atlantic Ocean; Atlantic Ocean (South); Lavalleja; Uruguay
Año:2014
Volumen:71
Número:3
Página de inicio:345
Página de fin:355
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_v71_n3_p345_Lossada

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Citas:

---------- APA ----------
Lossada, A.C., Rapalini, A.E. & Betucci, L.S. (2014) . Nico Pérez - Zapicán basic dykes swarm, Uruguay: radimetric and paleomagnetic evidence about their age . Revista de la Asociacion Geologica Argentina, 71(3), 345-355.
Recuperado de https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00044822_v71_n3_p345_Lossada [ ]
---------- CHICAGO ----------
Lossada, A.C., Rapalini, A.E., Betucci, L.S. "Nico Pérez - Zapicán basic dykes swarm, Uruguay: radimetric and paleomagnetic evidence about their age " . Revista de la Asociacion Geologica Argentina 71, no. 3 (2014) : 345-355.
Recuperado de https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00044822_v71_n3_p345_Lossada [ ]
---------- MLA ----------
Lossada, A.C., Rapalini, A.E., Betucci, L.S. "Nico Pérez - Zapicán basic dykes swarm, Uruguay: radimetric and paleomagnetic evidence about their age " . Revista de la Asociacion Geologica Argentina, vol. 71, no. 3, 2014, pp. 345-355.
Recuperado de https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00044822_v71_n3_p345_Lossada [ ]
---------- VANCOUVER ----------
Lossada, A.C., Rapalini, A.E., Betucci, L.S. Nico Pérez - Zapicán basic dykes swarm, Uruguay: radimetric and paleomagnetic evidence about their age . Rev. Asoc. Geol. Argent. 2014;71(3):345-355.
Available from: https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00044822_v71_n3_p345_Lossada [ ]