New characterization of the Early Triassic Sonoma Foreland basin (western USA) and its controlling factors using multi-scale integrated approaches

Autor: Gwénaël Caravaca, Brayard, Arnaud, Vennin, Emmanuelle, Guiraud, Michel, Pourhiet, Laetitia Le, Thomazo, Christophe, Anne-Sabine Grosjean, Olivier, Nicolas, Fara, Emmanuel, Escarguel, Gilles, Bylund, Kevin G, Jenks, Jim, Stephen, Daniel A.
Přispěvatelé: Biogéosciences [UMR 6282] (BGS), Université de Bourgogne (UB)-Centre National de la Recherche Scientifique (CNRS), Institut des Sciences de la Terre de Paris (iSTeP), Institut national des sciences de l'Univers (INSU - CNRS)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS), Institut Universitaire de France (IUF), Ministère de l'Education nationale, de l’Enseignement supérieur et de la Recherche (M.E.N.E.S.R.), Laboratoire Magmas et Volcans (LMV-ENSMSE), École des Mines de Saint-Étienne (Mines Saint-Étienne MSE), Institut Mines-Télécom [Paris] (IMT)-Institut Mines-Télécom [Paris] (IMT)-SPIN-Centre National de la Recherche Scientifique (CNRS)-Laboratoire Magmas et Volcans (LMV), Institut national des sciences de l'Univers (INSU - CNRS)-Université Jean Monnet - Saint-Étienne (UJM)-Institut de Recherche pour le Développement et la société-Université Clermont Auvergne [2017-2020] (UCA [2017-2020])-Centre National de la Recherche Scientifique (CNRS)-Observatoire de Physique du Globe de Clermont-Ferrand (OPGC), Institut national des sciences de l'Univers (INSU - CNRS)-Université Clermont Auvergne [2017-2020] (UCA [2017-2020])-Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Clermont Auvergne [2017-2020] (UCA [2017-2020])-Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Jean Monnet - Saint-Étienne (UJM)-Institut de Recherche pour le Développement et la société-Université Clermont Auvergne [2017-2020] (UCA [2017-2020])-Observatoire de Physique du Globe de Clermont-Ferrand (OPGC), Institut national des sciences de l'Univers (INSU - CNRS)-Université Clermont Auvergne [2017-2020] (UCA [2017-2020])-Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Clermont Auvergne [2017-2020] (UCA [2017-2020])-Centre National de la Recherche Scientifique (CNRS), Laboratoire d'Ecologie des Hydrosystèmes Naturels et Anthropisés (LEHNA), Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-École Nationale des Travaux Publics de l'État (ENTPE)-Centre National de la Recherche Scientifique (CNRS), Department of Earth Science, Utah Valley University (UVU), Department of Earth Sciences, Utah Valley University, International Association of Sedimentologists - Association des Sédimentologistes Français, ANR-13-JS06-0001,AFTER,Après la fin : la reconstruction des communautés marines durant la rediversification du Trias inférieur.(2013)
Jazyk: angličtina
Rok vydání: 2017
Předmět:
Zdroj: International Meeting of Sedimentology 2017
International Meeting of Sedimentology 2017, Oct 2017, Toulouse, France., ⟨10.13140/RG.2.2.13549.95208⟩
Popis: International audience; In the aftermath of the end-Permian mass extinction (~252 Ma), the Early Triassic Sonoma Foreland Basin (SFB) provides excellent sedimentary and fossil records to describe and understand the Early Triassic biotic recovery. Nevertheless, despite its importance, this basin is still poorly constrained and its controlling factors rather unclear. A new multi-disciplinary and integrated study is proposed based on ~50 sections from the literature and field-based data. Sedimentary, geochemical, paleontological, geodynamical and structural analyses have been conducted at various scales, from the section to the entire basin. Based on a high-resolution biostratigraphic framework, SFB depositional settings and their paleogeographical distribution are reconstructed, as well as their spatio-temporal and geodynamical evolutions. The SFB sedimentary record allows to characterize several facies associations representing depositional settings laterally evolving from transitional continental to intertidal tidal flats and high energy shoal, and to open marine outer platform settings. Nevertheless, marked differences are documented between the northern and southern parts of the SFB. Indeed, the sedimentary record shows differences in lithology and in spatial distribution of the sedimentary thicknesses. These observations are also reflected in the paleontological record, displaying the presence or absence of several biotic assemblages such as microbial communities. Microbial limestones are mainly restricted to the southern SFB while siliciclastic microbially induced sedimentary structures are locally observed in the northern part. Moreover, geochemical analyses indicate a spatially-heterogeneous influence of secondary alteration over the carbon isotope signals. In the southern part of the SFB, this record is highly altered and does not reflect the primary sedimentary signal. Conversely, the northern part of the basin shows a “pristine” sedimentary signal, representative of the ocean-atmosphere system. These North/South differences can result from processes interacting at different scales. On the one hand, at the basin scale, we notably show that heritage of the ~2 Gyr-long tectono-sedimentary history of the SFB is reflected in marked regional differences in subsidence rates. On the other hand, controls such as the geochemistry of the water column or terrestrial influxes have influenced the local evolution of the depositional settings. To sum up, we highlight a complex interplay of local to basin-scale controlling factors over the spatial distribution and lateral migration of depositional settings observed in the SFB and demonstrate that two sub-basins should be considered within the Early Triassic Sonoma Foreland Basin.
Databáze: OpenAIRE
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