SEDIMENTOLOGICAL AND ICHNOLOGICAL SIGNATURES FROM A FLUVIAL- DOMINATED DELTA IN SUBSURFACE: LAJAS FORMATION, MIDDLE JURASSIC, NEUQUÉN BASIN, ARGENTINA.
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| Format: | Artículo científico |
| Sprache: | es |
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Asociación Argentina de Sedimentología
2022
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| _version_ | 1876431437306003456 |
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| author | Mariano Germán Arregui |
| author_facet | Mariano Germán Arregui |
| contents | SEDIMENTOLOGICAL AND ICHNOLOGICAL SIGNATURES FROM A FLUVIAL- DOMINATED DELTA IN SUBSURFACE: LAJAS FORMATION, MIDDLE JURASSIC, NEUQUÉN BASIN, ARGENTINA. Mariano Germán Arregui Elizabeth Rodríguez Ciencias de la Tierra deltas bioturbation trace fossils Neuquén Basin Lajas Formation Transitional marine systems are affected by the interaction of wave, tidal and fluvial processes, with different impacts on salinity, turbidity, energy and depositional rate. Benthic organisms are influenced by these processes, and so, the ichnological signatures of these deposits represent key elements for environmental analysis. The Lajas Formation (Middle Jurassic, Neuquén Basin Argentina) is characterized by deposits accumulated in shallow transitional marine environments, mainly deltaic systems. A detailed study of sedimentological and ichnological features of the Lajas Formation developed on subsurface core samples allows to reconstruct the depositional conditions and evolution of unit and determine that the prevalent processes on the reworking of the sediments is fluvial, with subordinated wave processes. Fourteen sedimentary facies were defined, grouped into five facies associations: interdistributary plain, distributary channels, fairweather and storm-generated waves bars, delta front mouth bars, and prodelta. The ichnological analysis allows to differentiate 21 trace fossils: representing 5 ichnofacies: Skolithos (Mararonichnus suite), Skolithos (or Rosellia), impoverished Cruziana, Cruziana, Scoyenia and Zoophycos. Two surfaces with Glossifungites suites were recognized, and they are interpreted in two different ways, one related to authigenic changes and the other as a surface of stratigraphic importance, related to the variation in sea level. Finally, the whole section studied constitutes a prograding fluvio-dominated deltaic system, representing a Highstand System Tract, with minor transgressive events. 2022 artículo científico 1851-4979 https://www.redalyc.org/articulo.oa?id=381779242002 es http://www.redalyc.org/revista.oa?id=3817 Latin American Journal of Sedimentology and Basin Analysis application/pdf Asociación Argentina de Sedimentología Latin American Journal of Sedimentology and Basin Analysis (Argentina) Num.2 Vol.29 |
| format | Artículo científico |
| id | redalyc_381779242002 |
| institution | Redalyc |
| language | es |
| publishDate | 2022 |
| publisher | Asociación Argentina de Sedimentología |
| spellingShingle | SEDIMENTOLOGICAL AND ICHNOLOGICAL SIGNATURES FROM A FLUVIAL- DOMINATED DELTA IN SUBSURFACE: LAJAS FORMATION, MIDDLE JURASSIC, NEUQUÉN BASIN, ARGENTINA. Mariano Germán Arregui Ciencias de la Tierra deltas bioturbation trace fossils Neuquén Basin Lajas Formation SEDIMENTOLOGICAL AND ICHNOLOGICAL SIGNATURES FROM A FLUVIAL- DOMINATED DELTA IN SUBSURFACE: LAJAS FORMATION, MIDDLE JURASSIC, NEUQUÉN BASIN, ARGENTINA. Mariano Germán Arregui Elizabeth Rodríguez Ciencias de la Tierra deltas bioturbation trace fossils Neuquén Basin Lajas Formation Transitional marine systems are affected by the interaction of wave, tidal and fluvial processes, with different impacts on salinity, turbidity, energy and depositional rate. Benthic organisms are influenced by these processes, and so, the ichnological signatures of these deposits represent key elements for environmental analysis. The Lajas Formation (Middle Jurassic, Neuquén Basin Argentina) is characterized by deposits accumulated in shallow transitional marine environments, mainly deltaic systems. A detailed study of sedimentological and ichnological features of the Lajas Formation developed on subsurface core samples allows to reconstruct the depositional conditions and evolution of unit and determine that the prevalent processes on the reworking of the sediments is fluvial, with subordinated wave processes. Fourteen sedimentary facies were defined, grouped into five facies associations: interdistributary plain, distributary channels, fairweather and storm-generated waves bars, delta front mouth bars, and prodelta. The ichnological analysis allows to differentiate 21 trace fossils: representing 5 ichnofacies: Skolithos (Mararonichnus suite), Skolithos (or Rosellia), impoverished Cruziana, Cruziana, Scoyenia and Zoophycos. Two surfaces with Glossifungites suites were recognized, and they are interpreted in two different ways, one related to authigenic changes and the other as a surface of stratigraphic importance, related to the variation in sea level. Finally, the whole section studied constitutes a prograding fluvio-dominated deltaic system, representing a Highstand System Tract, with minor transgressive events. 2022 artículo científico 1851-4979 https://www.redalyc.org/articulo.oa?id=381779242002 es http://www.redalyc.org/revista.oa?id=3817 Latin American Journal of Sedimentology and Basin Analysis application/pdf Asociación Argentina de Sedimentología Latin American Journal of Sedimentology and Basin Analysis (Argentina) Num.2 Vol.29 |
| title | SEDIMENTOLOGICAL AND ICHNOLOGICAL SIGNATURES FROM A FLUVIAL- DOMINATED DELTA IN SUBSURFACE: LAJAS FORMATION, MIDDLE JURASSIC, NEUQUÉN BASIN, ARGENTINA. |
| topic | Ciencias de la Tierra deltas bioturbation trace fossils Neuquén Basin Lajas Formation |
| url | https://www.redalyc.org/articulo.oa?id=381779242002 |