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dc.contributor.author
Zaffarana, Claudia Beatriz
dc.contributor.author
Somoza, Ruben
dc.date.available
2019-01-17T19:21:25Z
dc.date.issued
2012-06
dc.identifier.citation
Zaffarana, Claudia Beatriz; Somoza, Ruben; Palaeomagnetism and 40Ar/39Ar dating from Lower Jurassic rocks in Gastre, central Patagonia: further data to explore tectonomagmatic events associated with the break-up of Gondwana; Geological Society Publications House; Journal of the Geological Society; 169; 4; 6-2012; 371-379
dc.identifier.issn
0016-7649
dc.identifier.uri
http://hdl.handle.net/11336/68211
dc.description.abstract
Se presenta estudio paleomagnético y edades 40Ar/39Ar sobre lavas de la Formación Lonco Trapial, Macizo Norpatagónico. Se discuten resultados en el marco de desmembramiento de Gondwana.
dc.description.abstract
New 40Ar/ 39Ar data indicate ages of c. 185 Ma for the Lonco Trapial volcanic field in Gastre, north-central Patagonia, implying that this andesitic unit is roughly coeval with the Marifil silicic province that crops out in the eastern part of northern Patagonia. These volcanic fields are therefore roughly coeval with the Karoo-Ferrar large igneous province, further contributing to the huge, 185-180 Ma magmatic outpouring in southern Gondwana. The comparison of palaeomagnetic results from the unit with Early Jurassic reference palaeopoles suggests that Gastre records a small, anticlockwise finite rotation with respect to stable South America. This contrasts sharply with the large clockwise rotation recorded by roughly coeval dolerites from the Falkland/Malvinas Islands, and argues against a direct relationship between the rotation of the islands and the tectonic activity in Gastre. The results support previous suggestions that the Gastre Fault System is not the locus of major strike-slip displacement activity in the Jurassic as some workers have suggested. Taken as a whole, palaeomagnetic data from Patagonia suggest a more complex than previously thought pattern of distributed and variable deformation during the early stages of Gondwana breakup. The crustal block boundaries in the region remain cryptic.
dc.format
application/pdf
dc.language.iso
eng
dc.publisher
Geological Society Publications House
dc.rights
info:eu-repo/semantics/openAccess
dc.rights.uri
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
dc.subject
Patagonia
dc.subject
Gondwana
dc.subject
Jurásico
dc.subject.classification
Meteorología y Ciencias Atmosféricas
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Ciencias de la Tierra y relacionadas con el Medio Ambiente
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CIENCIAS NATURALES Y EXACTAS
dc.title
Palaeomagnetism and 40Ar/39Ar dating from Lower Jurassic rocks in Gastre, central Patagonia: further data to explore tectonomagmatic events associated with the break-up of Gondwana
dc.type
info:eu-repo/semantics/article
dc.type
info:ar-repo/semantics/artículo
dc.type
info:eu-repo/semantics/publishedVersion
dc.date.updated
2019-01-16T18:19:06Z
dc.journal.volume
169
dc.journal.number
4
dc.journal.pagination
371-379
dc.journal.pais
Reino Unido
dc.journal.ciudad
Londres
dc.description.fil
Fil: Zaffarana, Claudia Beatriz. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria. Instituto de Ecología, Genética y Evolución de Buenos Aires. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Instituto de Ecología, Genética y Evolución de Buenos Aires; Argentina. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Departamento de Ciencias Geológicas; Argentina
dc.description.fil
Fil: Somoza, Ruben. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria. Instituto de Ecología, Genética y Evolución de Buenos Aires. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Instituto de Ecología, Genética y Evolución de Buenos Aires; Argentina. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Departamento de Ciencias Geológicas; Argentina
dc.journal.title
Journal of the Geological Society
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/doi/http://dx.doi.org/10.1144/0016-76492011-089
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/url/http://mr.crossref.org/iPage?doi=10.1144%2F0016-76492011-089
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