Tracking sea bed topography in the Jurassic. The Lotena Group in the Sierra de la Vaca Muerta (Neuquén Basin, Argentina)
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| Natura: | Artículo científico |
| Lingua: | en |
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Universitat de Barcelona
2005
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| _version_ | 1876482521786482688 |
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| author | C. Zavala |
| author_facet | C. Zavala |
| contents | Tracking sea bed topography in the Jurassic. The Lotena Group in the Sierra de la Vaca Muerta (Neuquén Basin, Argentina) C. Zavala Ciencias de la Tierra Jurassic Neuquén Basin Contained flows Lotena Formation The Lotena Group is a clastic to evaporitic unit up to 650 m thick that accumulated during the Middle to LateJurassic in the Neuquén Basin, western Argentina. Extensive field work carried out in the Sierra de la VacaMuerta and Arroyo Covunco areas, including the measurement of seven detailed stratigraphic sections and geologicalmapping allow the discrimination of six unconformity-bounded units or sequences. The first sequence iscomposed of red beds and evaporites belonging to the Tábanos Formation that unconformably overlies strata ofthe Lower to Middle Jurassic Cuyo Group. Sequences 2 to 5 are shallow marine and display a basal sandstoneinterval attributed to confined shelfal sandstone lobes. These grade vertically into unconfined shelfal sandstonelobes, and terminate with carbonate deposits. The basal interval is restricted to the thickest areas of eachsequence, a relationship attributed to structural relief. Sequence 6 has a very irregular shape and strongly truncatesthe underlying deposits. It is composed almost entirely of massive carbonate strata that were deposited bydensity currents. Facies analysis and stratigraphic mapping suggest periodic recycling of previous accumulations.Stratigraphic evidence suggests that the Lotena Group in the Sierra de la Vaca Muerta and adjacent areasprobably accumulated over a tectonically unstable basement. Sequences 1, 2 and 3 display evidence of accumulationin an extensional tectonic setting, while sequences 4, 5 and 6 experienced a northward shift of theirdepocentres associated with extensive erosional truncation of the marginal areas, suggesting that accumulationwas affected by early stages of growth of the Covunco anticline 2005 artículo científico 1695-6133 https://www.redalyc.org/articulo.oa?id=50530203 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_50530203 |
| institution | Redalyc |
| language | en |
| publishDate | 2005 |
| publisher | Universitat de Barcelona |
| spellingShingle | Tracking sea bed topography in the Jurassic. The Lotena Group in the Sierra de la Vaca Muerta (Neuquén Basin, Argentina) C. Zavala Ciencias de la Tierra Jurassic Neuquén Basin Contained flows Lotena Formation Tracking sea bed topography in the Jurassic. The Lotena Group in the Sierra de la Vaca Muerta (Neuquén Basin, Argentina) C. Zavala Ciencias de la Tierra Jurassic Neuquén Basin Contained flows Lotena Formation The Lotena Group is a clastic to evaporitic unit up to 650 m thick that accumulated during the Middle to LateJurassic in the Neuquén Basin, western Argentina. Extensive field work carried out in the Sierra de la VacaMuerta and Arroyo Covunco areas, including the measurement of seven detailed stratigraphic sections and geologicalmapping allow the discrimination of six unconformity-bounded units or sequences. The first sequence iscomposed of red beds and evaporites belonging to the Tábanos Formation that unconformably overlies strata ofthe Lower to Middle Jurassic Cuyo Group. Sequences 2 to 5 are shallow marine and display a basal sandstoneinterval attributed to confined shelfal sandstone lobes. These grade vertically into unconfined shelfal sandstonelobes, and terminate with carbonate deposits. The basal interval is restricted to the thickest areas of eachsequence, a relationship attributed to structural relief. Sequence 6 has a very irregular shape and strongly truncatesthe underlying deposits. It is composed almost entirely of massive carbonate strata that were deposited bydensity currents. Facies analysis and stratigraphic mapping suggest periodic recycling of previous accumulations.Stratigraphic evidence suggests that the Lotena Group in the Sierra de la Vaca Muerta and adjacent areasprobably accumulated over a tectonically unstable basement. Sequences 1, 2 and 3 display evidence of accumulationin an extensional tectonic setting, while sequences 4, 5 and 6 experienced a northward shift of theirdepocentres associated with extensive erosional truncation of the marginal areas, suggesting that accumulationwas affected by early stages of growth of the Covunco anticline 2005 artículo científico 1695-6133 https://www.redalyc.org/articulo.oa?id=50530203 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 | Tracking sea bed topography in the Jurassic. The Lotena Group in the Sierra de la Vaca Muerta (Neuquén Basin, Argentina) |
| topic | Ciencias de la Tierra Jurassic Neuquén Basin Contained flows Lotena Formation |
| url | https://www.redalyc.org/articulo.oa?id=50530203 |