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Paleo-redox conditions during the demise of a carbonate platform in the Tethyan ocean: evidence from phosphatized and metals (Mn and Fe) rich hardgrounds

dc.contributor.authorBasilone, Luca
dc.contributor.authorBernardini, Simone
dc.contributor.authorGrassa, Fausto
dc.contributor.authorSulli, Attilio
dc.contributor.authorNieto, Luís Miguel
dc.contributor.authorAbbassi, Anas
dc.contributor.authorJovane, Luigi
dc.date.accessioned2024-10-14T08:58:40Z
dc.date.available2024-10-14T08:58:40Z
dc.date.issued2024-09-19
dc.description.abstractPhosphatized Mn and Fe rich hardgrounds and condensed pelagic deposits in carbonate platform successions are precious archives of abrupt climate and environmental changes (redox conditions and phosphorous availability) in the past shallow-water marine environment. While numerous examples have been documented in the Cretaceous successions of the Northern Tethys, the scarcity of similar descriptions from the southern margins suggests differences in sedimentary processes or preservation conditions. In this work we study three phosphatized Mn and Fe rich hardgrounds and pelagic condensed deposits that mark the repetitive demise of the Panormide carbonate platform developed in the Southern Tethyan margin during the Cretaceous. The integration of SEM-EDS, PXRD, and Micro-Raman spectroscopy data shows that these hardgrounds consist of fine-grained Fe (goethite and hematite) and Mn (birnessite and/or vernadite) oxides dispersed in a calcite and apatite matrix. Micro-Raman spectroscopy shows the presence of oxidized Mn species: Mn3+ and Mn4+. The oxidation of Mn2+ → Mn3+/4+ and/or Fe2+ → Fe3+ occurred at the sediment-seawater interface under oxic conditions (where both Mn and Fe oxidize) or suboxic conditions (where only Fe oxidizes). The paleoenvironmental perturbations that triggered the formation of both hardgrounds and condensed pelagic deposits were likely related to pCO2 cycle, upwelling of P-Mn-Fe-rich water masses, eutrophication and phosphatization related to the Cretaceous climate oscillations during the main Oceanic Anoxic Events. These perturbations were likely enhanced by tectonic activity. Moreover, we show that the formation of the phosphatized metals-rich hardgrounds and the recovery of shallow-water sedimentation occurred after long-term periods (6–12 Ma). Thus, the Panormide serves as a remarkable example of resilience amidst significant climatic changes.es_ES
dc.description.sponsorshipResearch Group RNM200 (UJA-Junta de Andalucía) and Research Project 1380715 (FEDER-UJA).es_ES
dc.identifier.citationBasilone et al. (2024). Marine and Petroleum Geology, 170:107121es_ES
dc.identifier.issn0264-8172es_ES
dc.identifier.otherhttps://doi.org/10.1016/j.marpetgeo.2024.107121es_ES
dc.identifier.urihttps://hdl.handle.net/10953/3277
dc.language.isoenges_ES
dc.publisherElsevieres_ES
dc.relation.ispartofMarine and Petroleum Geologyes_ES
dc.rightsCC0 1.0 Universal*
dc.rights.accessRightsinfo:eu-repo/semantics/openAccesses_ES
dc.rights.urihttp://creativecommons.org/publicdomain/zero/1.0/*
dc.subjectCretaceous carbonate platformes_ES
dc.subjectDrowning unconformityes_ES
dc.subjectFe-Mn hardgroundes_ES
dc.subjectPaleo redox conditionses_ES
dc.subjectC and O isotopeses_ES
dc.subjectRaman spectroscopyes_ES
dc.subjectClimate changees_ES
dc.subjectSynsedimentary tectonices_ES
dc.subjectSicilyes_ES
dc.titlePaleo-redox conditions during the demise of a carbonate platform in the Tethyan ocean: evidence from phosphatized and metals (Mn and Fe) rich hardgroundses_ES
dc.typeinfo:eu-repo/semantics/articlees_ES
dc.type.versioninfo:eu-repo/semantics/acceptedVersiones_ES

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