Please use this identifier to cite or link to this item: http://hdl.handle.net/1959.14/124657
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- Title
- Tertiary tectonics of the sub-Andean region of the North Patagonian Andes, southern central Andes of Argentina (41–42°30′S)
- Related
- Journal of South American earth sciences, Vol. 20, No. 3 (2005), p.157-170
- DOI
- 10.1016/j.jsames.2005.05.013
- Publisher
- Elsevier
- Date
- 2005
- FoR/RFCD Code(s)
-
040400 Geophysics
040300 Geology
- Author/Creator
- Giacosa, Raúl E
- Author/Creator
- Afonso, Juan C
- Author/Creator
- Nemesio Heredia, C
- Author/Creator
- Paredes, José
- Description
- The sub-Andean region of the North Patagonian Andes is located between the north Patagonian foreland and the highest elevations of the Andean Cordillera. Its Tertiary contractional structure, active since the upper Late Oligocene and through the upper Late Miocene, corresponds to the external sector of the North Patagonian Andes fold-and-thrust belt, which is characterized by east-vergent thrusts that affect stratified Cenozoic rocks. The units involved in the deformation correspond to El Maitén Oligocene volcanic belt, deformed between east-vergent thrusts and backthrusts, and Oligocene–Miocene sedimentary rocks of the Ñirihuau–Collón Curá Basin. The northern sector of the basin was structured as a thin-skinned fold belt that comprises the Ñirihuau fold belt and a frontal sedimentary wedge. To the south, sedimentary depocenters are confined between medium- to high-angle reverse faults with evidence of basement structural control. In both cases, the general tectonosedimentary framework shows the youngest units toward the east, in agreement with the advance of the orogenic wedge. Most of the Ñirihuau–Collón Curá Basin infill fits a foreland basin system model. Some sectors of the basin show evidence of structural control by normal faults in the initial sedimentation stages. This early extensional regime might be associated with late phases of Oligocene volcanism. Extensional structures probably were partially reactivated during the upper Late Oligocene, as suggested by seismic data.
- Description
- 14 page(s)
- Subject Keyword
- 040400 Geophysics
- Subject Keyword
- 040300 Geology
- Subject Keyword
- North Patagonian Andes
- Subject Keyword
- Andean tectonics
- Subject Keyword
- sub-Andean region
- Subject Keyword
- fold-and-thrust belt
- Subject Keyword
- Tertiary basins
- Resource Type
- journal article
- Organisation
- Macquarie University. National Key Centre for Geochemical Evolution and Metallogeny of Continents (GEMOC)
- Identifier
- http://hdl.handle.net/1959.14/124657
- Identifier
- ISSN:0895-9811
- Identifier
- mq-rm-2009006876
- Language
- eng
- Reviewed
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