Hierarchy of bounding surfaces in aeolian sandstones of the Jurassic Tordillo Formation (Neuquén Basin, Argentina)
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| Formato: | Artículo científico |
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Universitat de Barcelona
2005
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| _version_ | 1876451829935505408 |
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| author | C. Zavala |
| author_facet | C. Zavala |
| contents | Hierarchy of bounding surfaces in aeolian sandstones of the Jurassic Tordillo Formation (Neuquén Basin, Argentina) C. Zavala H. Maretto M. Di Meglio Ciencias de la Tierra Jurassic Argentina Neuquén Basin Aeolian deposits Tordillo Formation The Tordillo Formation is a continental clastic unit deposited in the Neuquén Basin during the Late Jurassic.This paper discusses the stratigraphy of the succession outcropping at the Quebrada del Sapo, with emphasis onthe origin, dimensions and hierarchy of bounding surfaces of aeolian deposits. Field survey, supported by themeasurement of three detailed stratigraphic sections and line drawings of photographic panels allow the identificationof four unconformity bounded units within the succession, informally named as T1, T2, T3 and T4.Units T1 and T3 are composed of conglomerates and pebbly sandstones deposited by density flows in a lacustrineenvironment. Paleocurrents indicate a source area located in the northeast while the presence of angularsandstone blocks suggests resedimentation processes. T2 and T4 units are composed of fine to medium grainedsandstones of aeolian origin, characterized by large scale dunes and minor dry interdunes. Both units have sharpbases, and overlie a deflation surface characterized by the presence of ventifacts. Paleocurrents suggest a paleowinddirection from the southwest. Internal bounding surfaces show a hierarchy of at least four discrete surfaceswhich were numbered according to their crescent extension. Type 1 surfaces are related to the normaladvance of the dune front. Type 2 are reactivation surfaces within a single dune set. Type 3 surfaces relate to setsuperposition. Type 4 surfaces are related to extensive deflation of the dune complex, and define at least nineelementary aeolian sequences in the T4 unit. 2005 artículo científico 1695-6133 https://www.redalyc.org/articulo.oa?id=50530205 en http://www.redalyc.org/revista.oa?id=505 Geologica Acta: an international earth science journal application/pdf Universitat de Barcelona Geologica Acta: an international earth science journal (España) Num.2 Vol.3 |
| format | Artículo científico |
| id | redalyc_50530205 |
| institution | Redalyc |
| language | en |
| publishDate | 2005 |
| publisher | Universitat de Barcelona |
| spellingShingle | Hierarchy of bounding surfaces in aeolian sandstones of the Jurassic Tordillo Formation (Neuquén Basin, Argentina) C. Zavala Ciencias de la Tierra Jurassic Argentina Neuquén Basin Aeolian deposits Tordillo Formation Hierarchy of bounding surfaces in aeolian sandstones of the Jurassic Tordillo Formation (Neuquén Basin, Argentina) C. Zavala H. Maretto M. Di Meglio Ciencias de la Tierra Jurassic Argentina Neuquén Basin Aeolian deposits Tordillo Formation The Tordillo Formation is a continental clastic unit deposited in the Neuquén Basin during the Late Jurassic.This paper discusses the stratigraphy of the succession outcropping at the Quebrada del Sapo, with emphasis onthe origin, dimensions and hierarchy of bounding surfaces of aeolian deposits. Field survey, supported by themeasurement of three detailed stratigraphic sections and line drawings of photographic panels allow the identificationof four unconformity bounded units within the succession, informally named as T1, T2, T3 and T4.Units T1 and T3 are composed of conglomerates and pebbly sandstones deposited by density flows in a lacustrineenvironment. Paleocurrents indicate a source area located in the northeast while the presence of angularsandstone blocks suggests resedimentation processes. T2 and T4 units are composed of fine to medium grainedsandstones of aeolian origin, characterized by large scale dunes and minor dry interdunes. Both units have sharpbases, and overlie a deflation surface characterized by the presence of ventifacts. Paleocurrents suggest a paleowinddirection from the southwest. Internal bounding surfaces show a hierarchy of at least four discrete surfaceswhich were numbered according to their crescent extension. Type 1 surfaces are related to the normaladvance of the dune front. Type 2 are reactivation surfaces within a single dune set. Type 3 surfaces relate to setsuperposition. Type 4 surfaces are related to extensive deflation of the dune complex, and define at least nineelementary aeolian sequences in the T4 unit. 2005 artículo científico 1695-6133 https://www.redalyc.org/articulo.oa?id=50530205 en http://www.redalyc.org/revista.oa?id=505 Geologica Acta: an international earth science journal application/pdf Universitat de Barcelona Geologica Acta: an international earth science journal (España) Num.2 Vol.3 |
| title | Hierarchy of bounding surfaces in aeolian sandstones of the Jurassic Tordillo Formation (Neuquén Basin, Argentina) |
| topic | Ciencias de la Tierra Jurassic Argentina Neuquén Basin Aeolian deposits Tordillo Formation |
| url | https://www.redalyc.org/articulo.oa?id=50530205 |