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dc.contributor.author
Amidon, William H.
dc.contributor.author
Luna, Elisa Edith
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dc.contributor.author
Fisher, G. Burch
dc.contributor.author
Burbank, Douglas W.
dc.contributor.author
Kylander Clark, Andrew R. C.
dc.contributor.author
Alonso, Ricardo Narciso
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dc.date.available
2018-12-26T13:37:24Z
dc.date.issued
2017-02
dc.identifier.citation
Amidon, William H.; Luna, Elisa Edith; Fisher, G. Burch; Burbank, Douglas W.; Kylander Clark, Andrew R. C.; et al.; Provenance and tectonic implications of Orán Group foreland basin sediments, Río Iruya canyon, NW Argentina (23° S); Wiley Blackwell Publishing, Inc; Basin Research; 29; 2-2017; 96-112
dc.identifier.issn
0950-091X
dc.identifier.uri
http://hdl.handle.net/11336/66947
dc.description.abstract
Foreland basins are important recorders of tectonic and climatic processes in evolving mountain ranges. The Río Iruya canyon of NW Argentina (23° S) exposes ca. 7500 m of Orán Group foreland basin sediments, spanning over 8 Myr of near continuous deposition in the Central Andes. This study presents a record of sedimentary provenance for the Iruya Section in the context of a revised stratigraphic chronology. We use U-Pb zircon ages from six interbedded ash layers and new magnetostratigraphy to constrain depositional ages in the section between 1.94 and 6.49 Ma, giving an average sedimentation rate of 0.93 ± 0.02 (2σ) km Myr−1. We then pair U-Pb detrital zircon dating with quartz trace-element analysis to track changes in sedimentary provenance from ca. 7.6 to 1.8 Ma. Results suggest that from ca. 7.6 to ca. 6.3 Ma, the Iruya watershed did not tap the Salta Group or Neogene volcanics that are currently exposed in the eastern Cordillera and Puna margin. One explanation is that a long-lived topographic barrier separated the eastern Puna from the foreland for much of the mid-late Miocene, and that the arrival of Jurassic-Neogene zircons records regional tectonic reactivation at ca. 6.3 Ma. A second major provenance shift at ca. 4 Ma is marked by changes in the zircon and quartz populations, which appear to be derived from a restricted source region in Proterozoic-Ordovician meta-sediments. Considered in conjunction with the onset of coarse conglomerate deposition, we attribute this shift to accelerated uplift of the Santa Victoria range, which currently defines the catchment's western limit. A third shift at ca. 2.3 Ma records an apparent disconnection of the Iruya with the eastern Puna, perhaps due to defeat of the proto Rio-Iruya by the rising Santa Victoria range. This study is one of the first applications of quartz trace-element provenance analysis, which we show to be an effective complement to U-Pb detrital zircon dating when appropriate statistical methods are applied.
dc.format
application/pdf
dc.language.iso
eng
dc.publisher
Wiley Blackwell Publishing, Inc
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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
Iruya
dc.subject
Eastern Cordillera
dc.subject
Subandean
dc.subject
Santa Victoria
dc.subject.classification
Meteorología y Ciencias Atmosféricas
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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
Provenance and tectonic implications of Orán Group foreland basin sediments, Río Iruya canyon, NW Argentina (23° S)
dc.type
info:eu-repo/semantics/article
dc.type
info:ar-repo/semantics/artículo
dc.type
info:eu-repo/semantics/publishedVersion
dc.date.updated
2018-12-19T14:38:58Z
dc.journal.volume
29
dc.journal.pagination
96-112
dc.journal.pais
Reino Unido
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dc.journal.ciudad
Londres
dc.description.fil
Fil: Amidon, William H.. Middlebury College; Estados Unidos
dc.description.fil
Fil: Luna, Elisa Edith. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina. Universidad Nacional de San Juan. Facultad de Arquitectura, Urbanismo y Diseño. Instituto Regional de Planeamiento y Hábitat; Argentina. Middlebury College; Estados Unidos
dc.description.fil
Fil: Fisher, G. Burch. University Of California, Santa Barbara;
dc.description.fil
Fil: Burbank, Douglas W.. University of California; Estados Unidos
dc.description.fil
Fil: Kylander Clark, Andrew R. C.. University of California; Estados Unidos
dc.description.fil
Fil: Alonso, Ricardo Narciso. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Salta; Argentina. Universidad Nacional de Salta; Argentina
dc.journal.title
Basin Research
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dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/doi/https://dx.doi.org/10.1111/bre.12139
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/url/https://onlinelibrary.wiley.com/doi/abs/10.1111/bre.12139
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