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dc.date.accessioned2020-10-08T18:07:53Z
dc.date.created2020-10-07T11:03:43Z
dc.date.issued2021
dc.identifier.citationGarcía-García, Fernando Rodríguez-Tovar, Francisco J. Poyatos More, Miquel Yeste, Luis M. Viseras, César . Sedimentological and ichnological signatures of an offshore-transitional hyperpycnal system (Late Miocene, Betic Cordillera, Southern Spain). Palaeogeography, Palaeoclimatology, Palaeoecology. 2020
dc.identifier.urihttp://hdl.handle.net/10852/80556
dc.description.abstractHyperpycnal flows have been widely described in different lacustrine and marine environments but sedimentary structures and fossil content in hyperpycnites often offer limited information about the palaeoenvironmental conditions. This limitation can be improved by ichnological analysis, which has been recently used as a tool to differentiate between different type of subaqueous deposits, even though still only a few detailed ichnological studies on hyperpycnites exist. In order to bridge this gap in knowledge, a 50 m-thick package of terrestrial organic debris-rich, dominantly structureless and well-sorted sandstone bodies alternating with burrowed siltstones (Upper Miocene, Betic Cordillera, Spain) is here analyzed. This study is based on observations of a well-exposed outcrop and cores from a well drilled just behind the outcrop to bridge field-scale observational gaps. Two type of sandbodies were typified on the basis of their stratigraphic architecture, physical sedimentary structures, and ichnofacies in the fine-grained deposits embedding them: (1) Lobate to channelized-top sandstones embebbed into silty sands with dominant highly variable degree of bioturbation by Taenidium and Schaubcylindrichnus (depauperate Cruziana ichnofacies) and interpreted as proximal marine sustained hyperpycnites in prodelta settings; and (2) channelized-lobate (cut-and-fill sequence) sandstones embebbed into siltstones with dominant Nereites and Phycosiphon (Nereites ichnofacies) interpreted as distal hyperpycnites developed in offshore settings. The studied succession is interpreted to represent the progradation of a sandy hyperpycnal system along a prodelta to starved offshore setting with high variability in grain-size, benthic food and oxygen content. Results of this study suggest that a multi-scale analysis focused on trace fossils and physical sedimentary signatures is needed to get a better understanding of these river-derived sustained-flow turbidites (hyperpycnites) that are less well known than their conventional surge-type turbidite counterparts.
dc.languageEN
dc.rightsAttribution-NonCommercial-NoDerivatives 4.0 International
dc.rights.urihttps://creativecommons.org/licenses/by-nc-nd/4.0/
dc.titleSedimentological and ichnological signatures of an offshore-transitional hyperpycnal system (Late Miocene, Betic Cordillera, Southern Spain)
dc.typeJournal article
dc.creator.authorGarcía-García, Fernando
dc.creator.authorRodríguez-Tovar, Francisco J.
dc.creator.authorPoyatos More, Miquel
dc.creator.authorYeste, Luis M.
dc.creator.authorViseras, César
dc.date.embargoenddate2022-10-01
cristin.unitcode185,15,22,50
cristin.unitnameSeksjon for geologi og geofysikk
cristin.ispublishedtrue
cristin.fulltextpostprint
cristin.fulltextpostprint
cristin.qualitycode2
dc.identifier.cristin1837846
dc.identifier.bibliographiccitationinfo:ofi/fmt:kev:mtx:ctx&ctx_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.jtitle=Palaeogeography, Palaeoclimatology, Palaeoecology&rft.volume=&rft.spage=&rft.date=2020
dc.identifier.jtitlePalaeogeography, Palaeoclimatology, Palaeoecology
dc.identifier.volume561
dc.identifier.doihttps://doi.org/10.1016/j.palaeo.2020.110039
dc.identifier.urnURN:NBN:no-83643
dc.type.documentTidsskriftartikkel
dc.type.peerreviewedPeer reviewed
dc.source.issn0031-0182
dc.identifier.fulltextFulltext https://www.duo.uio.no/bitstream/handle/10852/80556/1/Garcia-Garcia_Paleo3_in%2Bpress.pdf
dc.type.versionAcceptedVersion
cristin.articleid110039


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