Facies and depositional settings during the Smithin in the Torrey area (Early Triassic, Utah, USA)
International audience The Permian-Triassic transition records the most devastating biotic crisis of the Phanerozoic with 90% of the marine genera being eradicated. The aftermath of this extinction is usually portrayed by large environmental perturbations such as ocean acidification, anoxia, euxinia...
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ftunivnantes:oai:HAL:hal-03922923v1 2023-05-15T17:51:48+02:00 Facies and depositional settings during the Smithin in the Torrey area (Early Triassic, Utah, USA) Caravaca, Gwénaël Olivier, Nicolas Brayard, Arnaud Vennin, Emmanuelle Escarguel, Gilles Fara, Emmanuel Bylund, Kevin G. Jenks, James F. Stephen, Daniel A. Laboratoire de Géologie de Lyon - Terre, Planètes, Environnement Lyon (LGL-TPE) École normale supérieure - Lyon (ENS Lyon)-Université Claude Bernard Lyon 1 (UCBL) Université de Lyon-Université de Lyon-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS) Biogéosciences UMR 6282 (BGS) Université de Bourgogne (UB)-Centre National de la Recherche Scientifique (CNRS) Utah Valley University (UVU) Pau, France 2014-10-27 https://hal.science/hal-03922923 en eng HAL CCSD hal-03922923 https://hal.science/hal-03922923 24ème Réunion des Sciences de la Terre https://hal.science/hal-03922923 24ème Réunion des Sciences de la Terre, Oct 2014, Pau, France https://rst2014-pau.sciencesconf.org/ [SDU]Sciences of the Universe [physics] [SDU.STU]Sciences of the Universe [physics]/Earth Sciences [SDU.STU.PL]Sciences of the Universe [physics]/Earth Sciences/Planetology [SDU.STU.ST]Sciences of the Universe [physics]/Earth Sciences/Stratigraphy info:eu-repo/semantics/conferenceObject Conference papers 2014 ftunivnantes 2023-01-31T23:53:18Z International audience The Permian-Triassic transition records the most devastating biotic crisis of the Phanerozoic with 90% of the marine genera being eradicated. The aftermath of this extinction is usually portrayed by large environmental perturbations such as ocean acidification, anoxia, euxinia and fluctuating productivity. However, these fluctuating conditions and their impact on the nature and tempo of the biotic recovery are still under debate. Thus, it is important to decipher the nature of the depositional settings and their putative spatio-temporal variations in order to improve our knowledge of post-crisis environments. The present work focuses on well-exposed Lower Triassic sedimentary rocks in the Torrey area (south-central Utah, USA). The studied Smithian deposits record a large-scale 3rd order sea-level cycle allowing a detailed reconstruction of the depositional setting evolution. In the middle Smithian, peritidal microbial limestones associated to a rather low-diversity benthic fauna deposited seaward of siliciclastic red beds of a tidal flat. Associated with siliceous sponges, microbial limestones formed small dm-scale patch reefs. During the late middle to late Smithian interval, tidal flat dolostones of interior platform, ooid-bioclastic deposits of tide-dominated shoal complexes, and mid-shelf bioclastic limestones characterize the sedimentary system. Microbial deposits correspond to sparse stromatolites that formed in the interior platform. They are contemporaneous of a well-diversified marine fauna found in seaward shoal complexes and mid-shelf area. The nature and the distribution of these Smithian microbial deposits were triggered by the depositional setting and did not support any peculiar deleterious environmental conditions. Conference Object Ocean acidification Université de Nantes: HAL-UNIV-NANTES |
institution |
Open Polar |
collection |
Université de Nantes: HAL-UNIV-NANTES |
op_collection_id |
ftunivnantes |
language |
English |
topic |
[SDU]Sciences of the Universe [physics] [SDU.STU]Sciences of the Universe [physics]/Earth Sciences [SDU.STU.PL]Sciences of the Universe [physics]/Earth Sciences/Planetology [SDU.STU.ST]Sciences of the Universe [physics]/Earth Sciences/Stratigraphy |
spellingShingle |
[SDU]Sciences of the Universe [physics] [SDU.STU]Sciences of the Universe [physics]/Earth Sciences [SDU.STU.PL]Sciences of the Universe [physics]/Earth Sciences/Planetology [SDU.STU.ST]Sciences of the Universe [physics]/Earth Sciences/Stratigraphy Caravaca, Gwénaël Olivier, Nicolas Brayard, Arnaud Vennin, Emmanuelle Escarguel, Gilles Fara, Emmanuel Bylund, Kevin G. Jenks, James F. Stephen, Daniel A. Facies and depositional settings during the Smithin in the Torrey area (Early Triassic, Utah, USA) |
topic_facet |
[SDU]Sciences of the Universe [physics] [SDU.STU]Sciences of the Universe [physics]/Earth Sciences [SDU.STU.PL]Sciences of the Universe [physics]/Earth Sciences/Planetology [SDU.STU.ST]Sciences of the Universe [physics]/Earth Sciences/Stratigraphy |
description |
International audience The Permian-Triassic transition records the most devastating biotic crisis of the Phanerozoic with 90% of the marine genera being eradicated. The aftermath of this extinction is usually portrayed by large environmental perturbations such as ocean acidification, anoxia, euxinia and fluctuating productivity. However, these fluctuating conditions and their impact on the nature and tempo of the biotic recovery are still under debate. Thus, it is important to decipher the nature of the depositional settings and their putative spatio-temporal variations in order to improve our knowledge of post-crisis environments. The present work focuses on well-exposed Lower Triassic sedimentary rocks in the Torrey area (south-central Utah, USA). The studied Smithian deposits record a large-scale 3rd order sea-level cycle allowing a detailed reconstruction of the depositional setting evolution. In the middle Smithian, peritidal microbial limestones associated to a rather low-diversity benthic fauna deposited seaward of siliciclastic red beds of a tidal flat. Associated with siliceous sponges, microbial limestones formed small dm-scale patch reefs. During the late middle to late Smithian interval, tidal flat dolostones of interior platform, ooid-bioclastic deposits of tide-dominated shoal complexes, and mid-shelf bioclastic limestones characterize the sedimentary system. Microbial deposits correspond to sparse stromatolites that formed in the interior platform. They are contemporaneous of a well-diversified marine fauna found in seaward shoal complexes and mid-shelf area. The nature and the distribution of these Smithian microbial deposits were triggered by the depositional setting and did not support any peculiar deleterious environmental conditions. |
author2 |
Laboratoire de Géologie de Lyon - Terre, Planètes, Environnement Lyon (LGL-TPE) École normale supérieure - Lyon (ENS Lyon)-Université Claude Bernard Lyon 1 (UCBL) Université de Lyon-Université de Lyon-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS) Biogéosciences UMR 6282 (BGS) Université de Bourgogne (UB)-Centre National de la Recherche Scientifique (CNRS) Utah Valley University (UVU) |
format |
Conference Object |
author |
Caravaca, Gwénaël Olivier, Nicolas Brayard, Arnaud Vennin, Emmanuelle Escarguel, Gilles Fara, Emmanuel Bylund, Kevin G. Jenks, James F. Stephen, Daniel A. |
author_facet |
Caravaca, Gwénaël Olivier, Nicolas Brayard, Arnaud Vennin, Emmanuelle Escarguel, Gilles Fara, Emmanuel Bylund, Kevin G. Jenks, James F. Stephen, Daniel A. |
author_sort |
Caravaca, Gwénaël |
title |
Facies and depositional settings during the Smithin in the Torrey area (Early Triassic, Utah, USA) |
title_short |
Facies and depositional settings during the Smithin in the Torrey area (Early Triassic, Utah, USA) |
title_full |
Facies and depositional settings during the Smithin in the Torrey area (Early Triassic, Utah, USA) |
title_fullStr |
Facies and depositional settings during the Smithin in the Torrey area (Early Triassic, Utah, USA) |
title_full_unstemmed |
Facies and depositional settings during the Smithin in the Torrey area (Early Triassic, Utah, USA) |
title_sort |
facies and depositional settings during the smithin in the torrey area (early triassic, utah, usa) |
publisher |
HAL CCSD |
publishDate |
2014 |
url |
https://hal.science/hal-03922923 |
op_coverage |
Pau, France |
genre |
Ocean acidification |
genre_facet |
Ocean acidification |
op_source |
24ème Réunion des Sciences de la Terre https://hal.science/hal-03922923 24ème Réunion des Sciences de la Terre, Oct 2014, Pau, France https://rst2014-pau.sciencesconf.org/ |
op_relation |
hal-03922923 https://hal.science/hal-03922923 |
_version_ |
1766159064486641664 |