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dc.contributor.author
Foix, Nicolas
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dc.contributor.author
Paredes, José Matildo
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dc.contributor.author
Giacosa, Raul Eduardo
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dc.date.available
2023-03-23T14:06:33Z
dc.date.issued
2012-02
dc.identifier.citation
Foix, Nicolas; Paredes, José Matildo; Giacosa, Raul Eduardo; Upper Cretaceous-Paleocene extensional phase in the Golfo San Jorge basin (Argentina): Growth-fault model, paleoseismicity and paleostress analysis; Pergamon-Elsevier Science Ltd; Journal of South American Earth Sciences; 33; 1; 2-2012; 110-118
dc.identifier.issn
0895-9811
dc.identifier.uri
http://hdl.handle.net/11336/191580
dc.description.abstract
A total of 170 synsedimentary normal faults preserved in the marine Salamanca Formation (Early Paleocene of the Golfo San Jorge basin) were described from exposures of the Northern Flank of the basin. The result of the paleostress analysis of those normal faults indicates an NE-SW (49°) extensional direction during Early Paleocene times. Synsedimentary normal faults and seismites in the unit demonstrate the occurrence of an extensional tectonic event coeval with the deposition of the Salamanca Formation. Available 3D seismic surveys of the subsurface of the basin allowed recognizing asymmetric, fault-bounded Upper Cretaceous-Paleocene depocentres, identifying at least two main tectonic pulses in this extensional phase. The mapping of normal faults from seismic attributes (e.g. time slices) is WNW-ESE (278°-98°), a trend that apart significantly from outcrop results. The major faults in the subsurface that affect the Early Paleocene succession are the result of the extensional reactivation of Lower Cretaceous normal faults, which are mainly related to pre-existing structures in the basement of the basin. The D/L ratio of normal faults in the subsurface give smaller values than those based on theoretical relationships, being considered as sub-displaced normal faults. These low D-L values imply that the length of the major Paleocene faults was reached earlier by inheritance of previous faults. In addition, the subsurface lengths of faults allowed estimating paleoearthquake magnitudes greater to M≈5 from empirical relations, matching with previous results obtained from the analysis of soft-sediment deformational structures preserved in the Salamanca Formation. This study displays at several scales the nature, origin and tectonic products of the Upper Cretaceous-Paleocene extensional phase in the Golfo San Jorge basin.
dc.format
application/pdf
dc.language.iso
eng
dc.publisher
Pergamon-Elsevier Science Ltd
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dc.rights
info:eu-repo/semantics/openAccess
dc.rights.uri
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
dc.subject
EXTENSIONAL PHASE
dc.subject
FAULT-GROWTH MODEL
dc.subject
GOLFO SAN JORGE BASIN
dc.subject
LATE CRETACEOUS-PALEOCENE
dc.subject
PALEOSEISMICITY
dc.subject
PALEOSTRESS
dc.subject.classification
Geología
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dc.subject.classification
Ciencias de la Tierra y relacionadas con el Medio Ambiente
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dc.subject.classification
CIENCIAS NATURALES Y EXACTAS
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dc.title
Upper Cretaceous-Paleocene extensional phase in the Golfo San Jorge basin (Argentina): Growth-fault model, paleoseismicity and paleostress analysis
dc.type
info:eu-repo/semantics/article
dc.type
info:ar-repo/semantics/artículo
dc.type
info:eu-repo/semantics/publishedVersion
dc.date.updated
2023-03-23T12:25:30Z
dc.journal.volume
33
dc.journal.number
1
dc.journal.pagination
110-118
dc.journal.pais
Estados Unidos
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dc.description.fil
Fil: Foix, Nicolas. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina. Universidad Nacional de la Patagonia "San Juan Bosco". Facultad de Ciencias Naturales - Sede Comodoro; Argentina
dc.description.fil
Fil: Paredes, José Matildo. Universidad Nacional de la Patagonia "San Juan Bosco". Facultad de Ciencias Naturales - Sede Comodoro; Argentina
dc.description.fil
Fil: Giacosa, Raul Eduardo. Secretaría de Industria y Minería. Servicio Geológico Minero Argentino; Argentina. Universidad Nacional de la Patagonia "San Juan Bosco". Facultad de Ciencias Naturales - Sede Comodoro; Argentina
dc.journal.title
Journal of South American Earth Sciences
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dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/url/https://www.sciencedirect.com/science/article/pii/S0895981111001076
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/doi/http://dx.doi.org/10.1016/j.jsames.2011.07.005
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