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<title lang=en>Wind-driven bottom currents and related sedimentary bodies in Lake Saint-Jean (Québec, Canada)</title>
<creator>Nutz, Alexis</creator>
<creator>Schuster, M.</creator>
<creator>Ghienne, J.-F.</creator>
<creator>Roquin, C.</creator>
<creator>Hay, M.B.</creator>
<creator>Rétif, F.</creator>
<creator>Certain, R.</creator>
<creator>Robin, N.</creator>
<creator>Raynal, O.</creator>
<creator>Cousineau, P.A.</creator>
<creator>Team, SIROCCO</creator>
<creator>Bouchette, F.</creator>
<contributor>Institut de Physique du Globe de Strasbourg, UMR7516, Université de Strasbourg/EOST, CNRS, Strasbourg ; Institut de physique du globe de Strasbourg (IPGS) ; Centre National de la Recherche Scientifique (CNRS) - Institut national des sciences de l'Univers (INSU - CNRS) - Centre National de la Recherche Scientifique (CNRS) - Institut national des sciences de l'Univers (INSU - CNRS)</contributor>
<contributor>Université du Québec [Chicoutimi] (UQAC)</contributor>
<contributor>Géosciences Montpellier ; Université des Antilles et de la Guyane (UAG) - Institut national des sciences de l'Univers (INSU - CNRS) - Université de Montpellier (UM) - Centre National de la Recherche Scientifique (CNRS)</contributor>
<contributor>Centre de Formation et de Recherche sur les Environnements Méditérranéens (CEFREM) ; Université de Perpignan Via Domitia (UPVD) - Centre National de la Recherche Scientifique (CNRS)</contributor>
<contributor>Gladys;Insu / Artemis (LMC14)</contributor>
<description>International audience</description>
<source>ISSN: 0016-7606</source>
<source>Geological Society of America Bulletin</source>
<publisher>Geological Society of America</publisher>
<identifier>insu-01184724</identifier>
<identifier>https://hal-insu.archives-ouvertes.fr/insu-01184724</identifier>
<source>https://hal-insu.archives-ouvertes.fr/insu-01184724</source>
<source>Geological Society of America Bulletin, Geological Society of America, 2015, pp.1-15. 〈10.1130/B31145.1〉</source>
<identifier>DOI : 10.1130/B31145.1</identifier>
<relation>info:eu-repo/semantics/altIdentifier/doi/10.1130/B31145.1</relation>
<language>en</language>
<subject>[SDU] Sciences of the Universe [physics]</subject>
<type>info:eu-repo/semantics/article</type>
<type>Journal articles</type>
<description lang=en>Lakes are major depositional systems for which the related depositional processes have long been considered relatively simple. Breaking this statement, this study presents a detailed analysis of deposits in Lake Saint-Jean, the third largest natural lake in Québec. In addition to postglacial deltaic and coastal depositional systems fringing the lake, current-controlled features such as a large subaqueous prograding wedge and three sediment drifts have been identifi ed in its central portion based on two-dimensional (2-D) acoustic high-resolution subbottom profiles. The large subaqueous prograding wedge is a 4-km-long and up to 15-m-thick heterolithic shelf-like construction in the southeastern part of the lake. The three sediment drifts are 0.1–0.5-km-long and 2–5-mthick mud mounds distributed on the lake floor in the central portion of the lake. Diatom analyses and radiocarbon dating show that the development of these current-controlled features occurred during the lacustrine phase, after the disconnection with the postglacial marine Laflamme Gulf at 8.5 cal. k.y. B.P. Depositional facies show evidence of recurrent bottom-current activity. Related deposits alternate with pelagic sedimentation stages characterized by the settling of mud and biogenic accumulations. We investigated the origin of bottom currents using a numerical simulation (SYMPHONIE, an oceanographic model), with the aim of modeling wind-induced lake-scale water circulation. Simulations suggest that the subaqueous prograding wedge and the three sediment drifts result from wind-induced bottom currents generated by storm events having wind speed greater than 10 m s–1. Such strong winds are able to significantly affect sedimentation in the central portion of Lake Saint-Jean. Theresulting wind-induced sedimentary features were integrated into a refi ned lacustrine depositional model that summarizes the evolution of a group of water bodies referred to as “wind-driven water bodies.” This study applies a new tool for lake strata characterization and highlights the potential diffi cultyin differentiating them from marine deposits in the geological record.</description>
<date>2015</date>
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