Allogenic controls on the fluvial architecture and fossil preservation of the Upper Triassic Ischigualasto Formation, NW Argentina
The Upper Triassic Ischigualasto Formation in NW Argentina was deposited in a fluvial system during the synrift filling of the extensional Ischigualasto-Villa Unión Basin. The expansive exposures of the fluvial architecture and paleosols provide a framework to reconstruct the paleoenvironmental evol...
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2017
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| Acceso en línea: | https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00370738_v362_n_p1_Colombi http://hdl.handle.net/20.500.12110/paper_00370738_v362_n_p1_Colombi |
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paper:paper_00370738_v362_n_p1_Colombi2023-06-08T15:02:15Z Allogenic controls on the fluvial architecture and fossil preservation of the Upper Triassic Ischigualasto Formation, NW Argentina Continental deposition Sequence stratigraphy Taphonomy Tectonic subsidence Triassic Volcanism Biological materials preservation Deposition Sedimentology Subsidence Equilibrium profiles Predictive tools Sedimentary evolution Sequence stratigraphy Taphonomy Temporal intervals Triassic Volcanism Stratigraphy deposition fluvial deposit fossil lithostratigraphy paleoenvironment sequence stratigraphy subsidence taphonomy tectonics Triassic volcanism Argentina Vertebrata The Upper Triassic Ischigualasto Formation in NW Argentina was deposited in a fluvial system during the synrift filling of the extensional Ischigualasto-Villa Unión Basin. The expansive exposures of the fluvial architecture and paleosols provide a framework to reconstruct the paleoenvironmental evolution of this basin during the Upper Triassic using continental sequence stratigraphy. The Ischigualasto Formation deposition can be divided into seven sequential sedimentary stages: the 1) Bypass stage; 2) Confined low-accommodation stage; 3) Confined high accommodation stage; 4) Unstable-accommodation stage; 5) Unconfined high-accommodation stage; 6) Unconfined low-accommodation stage; and finally, 7) Unconfined high-accommodation stage. The sedimentary evolution of the Ischigualasto Formation was driven by different allogenic controls such as rises and falls in lake levels, local tectonism, subsidence, volcanism, and climate, which also produced modifications of the equilibrium profile of the fluvial systems. All of these factors result in different accommodations in central and flank areas of the basin, which led to different architectural configurations of channels and floodplains. Allogenic processes affected not only the sequence stratigraphy of the basin but also the vertebrate and plant taphocenosis. Therefore, the sequence stratigraphy can be used not only as a predictive tool related to fossil occurrence but also to understand the taphonomic history of the basin at each temporal interval. © 2017 Elsevier B.V. 2017 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00370738_v362_n_p1_Colombi http://hdl.handle.net/20.500.12110/paper_00370738_v362_n_p1_Colombi |
| institution |
Universidad de Buenos Aires |
| institution_str |
I-28 |
| repository_str |
R-134 |
| collection |
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) |
| topic |
Continental deposition Sequence stratigraphy Taphonomy Tectonic subsidence Triassic Volcanism Biological materials preservation Deposition Sedimentology Subsidence Equilibrium profiles Predictive tools Sedimentary evolution Sequence stratigraphy Taphonomy Temporal intervals Triassic Volcanism Stratigraphy deposition fluvial deposit fossil lithostratigraphy paleoenvironment sequence stratigraphy subsidence taphonomy tectonics Triassic volcanism Argentina Vertebrata |
| spellingShingle |
Continental deposition Sequence stratigraphy Taphonomy Tectonic subsidence Triassic Volcanism Biological materials preservation Deposition Sedimentology Subsidence Equilibrium profiles Predictive tools Sedimentary evolution Sequence stratigraphy Taphonomy Temporal intervals Triassic Volcanism Stratigraphy deposition fluvial deposit fossil lithostratigraphy paleoenvironment sequence stratigraphy subsidence taphonomy tectonics Triassic volcanism Argentina Vertebrata Allogenic controls on the fluvial architecture and fossil preservation of the Upper Triassic Ischigualasto Formation, NW Argentina |
| topic_facet |
Continental deposition Sequence stratigraphy Taphonomy Tectonic subsidence Triassic Volcanism Biological materials preservation Deposition Sedimentology Subsidence Equilibrium profiles Predictive tools Sedimentary evolution Sequence stratigraphy Taphonomy Temporal intervals Triassic Volcanism Stratigraphy deposition fluvial deposit fossil lithostratigraphy paleoenvironment sequence stratigraphy subsidence taphonomy tectonics Triassic volcanism Argentina Vertebrata |
| description |
The Upper Triassic Ischigualasto Formation in NW Argentina was deposited in a fluvial system during the synrift filling of the extensional Ischigualasto-Villa Unión Basin. The expansive exposures of the fluvial architecture and paleosols provide a framework to reconstruct the paleoenvironmental evolution of this basin during the Upper Triassic using continental sequence stratigraphy. The Ischigualasto Formation deposition can be divided into seven sequential sedimentary stages: the 1) Bypass stage; 2) Confined low-accommodation stage; 3) Confined high accommodation stage; 4) Unstable-accommodation stage; 5) Unconfined high-accommodation stage; 6) Unconfined low-accommodation stage; and finally, 7) Unconfined high-accommodation stage. The sedimentary evolution of the Ischigualasto Formation was driven by different allogenic controls such as rises and falls in lake levels, local tectonism, subsidence, volcanism, and climate, which also produced modifications of the equilibrium profile of the fluvial systems. All of these factors result in different accommodations in central and flank areas of the basin, which led to different architectural configurations of channels and floodplains. Allogenic processes affected not only the sequence stratigraphy of the basin but also the vertebrate and plant taphocenosis. Therefore, the sequence stratigraphy can be used not only as a predictive tool related to fossil occurrence but also to understand the taphonomic history of the basin at each temporal interval. © 2017 Elsevier B.V. |
| title |
Allogenic controls on the fluvial architecture and fossil preservation of the Upper Triassic Ischigualasto Formation, NW Argentina |
| title_short |
Allogenic controls on the fluvial architecture and fossil preservation of the Upper Triassic Ischigualasto Formation, NW Argentina |
| title_full |
Allogenic controls on the fluvial architecture and fossil preservation of the Upper Triassic Ischigualasto Formation, NW Argentina |
| title_fullStr |
Allogenic controls on the fluvial architecture and fossil preservation of the Upper Triassic Ischigualasto Formation, NW Argentina |
| title_full_unstemmed |
Allogenic controls on the fluvial architecture and fossil preservation of the Upper Triassic Ischigualasto Formation, NW Argentina |
| title_sort |
allogenic controls on the fluvial architecture and fossil preservation of the upper triassic ischigualasto formation, nw argentina |
| publishDate |
2017 |
| url |
https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00370738_v362_n_p1_Colombi http://hdl.handle.net/20.500.12110/paper_00370738_v362_n_p1_Colombi |
| _version_ |
1768542026140221440 |