Nico Pérez - Zapicán basic dykes swarm, Uruguay: radimetric and paleomagnetic evidence about their age

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 identifi...

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Autores principales: Lossada, A.C., Rapalini, A.E., Betucci, L.S.
Formato: JOUR
Materias:
Basic dykes
Paleomagnetism
Río de la Plata craton
Uruguay
dike swarm
geochronology
magnetic fabric
paleomagnetism
petrography
Proterozoic
Atlantic Ocean
Atlantic Ocean (South)
Lavalleja
Acceso en línea:http://hdl.handle.net/20.500.12110/paper_00044822_v71_n3_p345_Lossada
Aporte de:
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
id todo:paper_00044822_v71_n3_p345_Lossada
record_format dspace
spelling todo:paper_00044822_v71_n3_p345_Lossada2023-10-03T13:59:05Z Nico Pérez - Zapicán basic dykes swarm, Uruguay: radimetric and paleomagnetic evidence about their age Lossada, A.C. Rapalini, A.E. Betucci, L.S. Basic dykes Paleomagnetism Río de la Plata craton Uruguay dike swarm geochronology magnetic fabric paleomagnetism petrography Proterozoic Atlantic Ocean Atlantic Ocean (South) Lavalleja Uruguay 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. JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_00044822_v71_n3_p345_Lossada
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-134
collection Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic Basic dykes
Paleomagnetism
Río de la Plata craton
Uruguay
dike swarm
geochronology
magnetic fabric
paleomagnetism
petrography
Proterozoic
Atlantic Ocean
Atlantic Ocean (South)
Lavalleja
Uruguay
spellingShingle Basic dykes
Paleomagnetism
Río de la Plata craton
Uruguay
dike swarm
geochronology
magnetic fabric
paleomagnetism
petrography
Proterozoic
Atlantic Ocean
Atlantic Ocean (South)
Lavalleja
Uruguay
Lossada, A.C.
Rapalini, A.E.
Betucci, L.S.
Nico Pérez - Zapicán basic dykes swarm, Uruguay: radimetric and paleomagnetic evidence about their age
topic_facet Basic dykes
Paleomagnetism
Río de la Plata craton
Uruguay
dike swarm
geochronology
magnetic fabric
paleomagnetism
petrography
Proterozoic
Atlantic Ocean
Atlantic Ocean (South)
Lavalleja
Uruguay
description 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.
format JOUR
author Lossada, A.C.
Rapalini, A.E.
Betucci, L.S.
author_facet Lossada, A.C.
Rapalini, A.E.
Betucci, L.S.
author_sort Lossada, A.C.
title Nico Pérez - Zapicán basic dykes swarm, Uruguay: radimetric and paleomagnetic evidence about their age
title_short Nico Pérez - Zapicán basic dykes swarm, Uruguay: radimetric and paleomagnetic evidence about their age
title_full Nico Pérez - Zapicán basic dykes swarm, Uruguay: radimetric and paleomagnetic evidence about their age
title_fullStr Nico Pérez - Zapicán basic dykes swarm, Uruguay: radimetric and paleomagnetic evidence about their age
title_full_unstemmed Nico Pérez - Zapicán basic dykes swarm, Uruguay: radimetric and paleomagnetic evidence about their age
title_sort nico pérez - zapicán basic dykes swarm, uruguay: radimetric and paleomagnetic evidence about their age
url http://hdl.handle.net/20.500.12110/paper_00044822_v71_n3_p345_Lossada
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AT rapaliniae nicoperezzapicanbasicdykesswarmuruguayradimetricandpaleomagneticevidenceabouttheirage
AT betuccils nicoperezzapicanbasicdykesswarmuruguayradimetricandpaleomagneticevidenceabouttheirage
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