Late Triassic to Early Jurassic sedimentation in northern Neuquén Basin, Argentina: Tectosedimentary Evolution of the First Transgression
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| Formato: | Artículo científico |
| Lenguaje: | en |
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Universitat de Barcelona
2005
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| _version_ | 1876431901099556864 |
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| author | S. Lanés |
| author_facet | S. Lanés |
| contents | Late Triassic to Early Jurassic sedimentation in northern Neuquén Basin, Argentina: Tectosedimentary Evolution of the First Transgression S. Lanés Ciencias de la Tierra Tectonics Sedimentology Neuquén Basin Upper Triassic Lower Jurassic The present paper interprets and discusses the Late Triassic-Early Jurassic of the first transgression at northernNeuquén basin (Argentina) and its paleostructural control due to ancient horsts and half-grabens. Six verticalsections were chosen along two east-west and north-south transects. Depositional systems have been determinedand correlated by means of ammonite, bivalve and brachiopod biostratigraphy. Two regions can be distinguishedbased on the areal distribution of the contemporaneous depositional systems in the studied area; oneat the east and the other to the west of El Freno creek. Vertical sections in the western region record shallowingupwardfluvio-dominated, transverse, normal-fault-controlled, slope-type fan deltas and intermediate shelf toGilbert-type fan deltas. Vertical sections in the eastern region record a transgressive siliciclastic storm-dominatedshelf, evolving from wave-dominated estuary to turbidity current influenced outer shelf. Accommodation vs.sedimentary supply ratio leads to identification of two stages of differing tectonic behaviour. The first one(Rhaetian-late Early Sinemurian) shows an accomodation greater than the sedimentary supply leading to thedeposition of the western slope-type fan deltas. The second stage (late Early Sinemurian-Toarcian) shows avarying accommodation: during the late Early Sinemurian, accommodation was outpaced by sedimentary supplyleading the intermediate-type fan delta to prograde. Later (late Early Sinemurian-Toarcian), accommodationexceeded the supply again, allowing transgression of the marine shelf and the increase in the marine depositionalarea. The two stages coincided with synrift and sag phases previously proposed for the southern Neuquén basin. 2005 artículo científico 1695-6133 https://www.redalyc.org/articulo.oa?id=50530202 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_50530202 |
| institution | Redalyc |
| language | en |
| publishDate | 2005 |
| publisher | Universitat de Barcelona |
| spellingShingle | Late Triassic to Early Jurassic sedimentation in northern Neuquén Basin, Argentina: Tectosedimentary Evolution of the First Transgression S. Lanés Ciencias de la Tierra Tectonics Sedimentology Neuquén Basin Upper Triassic Lower Jurassic Late Triassic to Early Jurassic sedimentation in northern Neuquén Basin, Argentina: Tectosedimentary Evolution of the First Transgression S. Lanés Ciencias de la Tierra Tectonics Sedimentology Neuquén Basin Upper Triassic Lower Jurassic The present paper interprets and discusses the Late Triassic-Early Jurassic of the first transgression at northernNeuquén basin (Argentina) and its paleostructural control due to ancient horsts and half-grabens. Six verticalsections were chosen along two east-west and north-south transects. Depositional systems have been determinedand correlated by means of ammonite, bivalve and brachiopod biostratigraphy. Two regions can be distinguishedbased on the areal distribution of the contemporaneous depositional systems in the studied area; oneat the east and the other to the west of El Freno creek. Vertical sections in the western region record shallowingupwardfluvio-dominated, transverse, normal-fault-controlled, slope-type fan deltas and intermediate shelf toGilbert-type fan deltas. Vertical sections in the eastern region record a transgressive siliciclastic storm-dominatedshelf, evolving from wave-dominated estuary to turbidity current influenced outer shelf. Accommodation vs.sedimentary supply ratio leads to identification of two stages of differing tectonic behaviour. The first one(Rhaetian-late Early Sinemurian) shows an accomodation greater than the sedimentary supply leading to thedeposition of the western slope-type fan deltas. The second stage (late Early Sinemurian-Toarcian) shows avarying accommodation: during the late Early Sinemurian, accommodation was outpaced by sedimentary supplyleading the intermediate-type fan delta to prograde. Later (late Early Sinemurian-Toarcian), accommodationexceeded the supply again, allowing transgression of the marine shelf and the increase in the marine depositionalarea. The two stages coincided with synrift and sag phases previously proposed for the southern Neuquén basin. 2005 artículo científico 1695-6133 https://www.redalyc.org/articulo.oa?id=50530202 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 | Late Triassic to Early Jurassic sedimentation in northern Neuquén Basin, Argentina: Tectosedimentary Evolution of the First Transgression |
| topic | Ciencias de la Tierra Tectonics Sedimentology Neuquén Basin Upper Triassic Lower Jurassic |
| url | https://www.redalyc.org/articulo.oa?id=50530202 |