Marine to lacustrine evolution in an evaporitic environment: the late miocene Lorca Basin, Spain

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dc.contributor.authorGarcía-Veigas, Jen_AU
dc.contributor.authorCendón, DIen_AU
dc.contributor.authorGilbert, Len_AU
dc.contributor.authorRosell, Len_AU
dc.contributor.authorOrtí, Fen_AU
dc.contributor.authorPlayà, Een_AU
dc.contributor.authorPrats, Een_AU
dc.contributor.authorSoria, JMen_AU
dc.contributor.authorCorbí, Hen_AU
dc.contributor.authorSanz, Een_AU
dc.date.accessioned2022-02-04T04:52:11Zen_AU
dc.date.available2022-02-04T04:52:11Zen_AU
dc.date.issued2015-06-15en_AU
dc.date.statistics2022-01-12en_AU
dc.description.abstractThe Lorca Basin, in the eastern sector of the Betic Range (SE Spain), is an intramontane basin recording an evaporitic succession (La Serrata Formation), of up to 300 m thick, with a ~ 235 m thick saline unit within. Altogether, the evaporitic record was originally interpreted as Messinian (Geel, 1976) and later assigned to Tortonian (Krijgsman and others, 2000). The detailed geochemical study provides relevant paleogeographic information at local scale and highlights the importance of hydrochemical changes taking place in coastal evaporite basins changing between marine and non-marine conditions without lithological variations. A stratigraphic framework is proposed correlating the outcropping gypsum beds (Gypsum Mb of La Serrata Fm) and the subsurface saline succession (Halite Mb) by means of strontium and sulfate isotopes (fig. 1). In the lower part of the Gypsum Mb the isotopic trends suggest that gypsum formed from marine waters while in the upper part, with Triassic isotopic signals, gypsum formed in a coastal lake mainly fed by non-marine waters. In the Halite Mb, the textures indicate precipitation in a very shallow, often dried, environment. Fluid inclusion compositions and bromine contents in salt show an evolution from normal marine brines, to brines resulting from the recycling of previously precipitated halite essentially by means of non-marine waters in a coastal lake setting. The overlying Laminated Pelite Mb (Geel, 1976) consists in its lower part of a number of non-marine gypsum beds intercalated between marine marls suggesting post-evaporitic refilling events of the Lorca Basin by the Mediterranean Sea before its final continentalization during the Pliocene. Biostratigraphic studies in progress are expected to refine age allocation within the evaporitic unit and therefore improve our understanding of the relationship to the “Messinian Salinity Crisis”. © 2015 The Authorsen_AU
dc.identifier.booktitleThe Sixth International Limnogeology Congress - Abstract Volume, Reno, Nevada, June 15–19, 2015: U.S. Geological Survey Open-File Report 2015-1092en_AU
dc.identifier.citationGarcía-Veigas, J., Cendón, D. I., Gibert, L., Rosell, L., Ortí, F., Playà, E., Prats, E., Soria, J. M., Corbí, H., & Sanz, E. (2015). Marine to lacustrine evolution in an evaporitic environment: the late miocene Lorca Basin, Spain. Presentation to Sixth International Limnogeology Congressm Reno, Nevada, June 15-19, 2015. In Rosen, M. R., Cohen, A., Kirby, M., Gierlowski-Kordesch, E., Starratt, S., Valero Garcés, B. L., & Varekamp, J., (eds). (2015). The Sixth International Limnogeology Congress - Abstract Volume, Reno, Nevada, June 15–19, 2015: U.S. Geological Survey Open-File Report 2015-1092. (pp. 73-74). doi:10.3133/ofr20151092en_AU
dc.identifier.conferenceenddate19 June 2015en_AU
dc.identifier.conferencenameSixth International Limnogeology Congressen_AU
dc.identifier.conferenceplaceReno, Nevadaen_AU
dc.identifier.conferencestartdate15 June 2015en_AU
dc.identifier.editorsRosen, M. R., Cohen, A., Kirby, M., Gierlowski-Kordesch, E., Starratt, S., Valero Garcés, B. L., & Varekamp, J.en_AU
dc.identifier.issn2331-1258en_AU
dc.identifier.pagination73-74en_AU
dc.identifier.urihttp://dx.doi.org/10.3133/ofr20151108en_AU
dc.identifier.urihttps://apo.ansto.gov.au/dspace/handle/10238/12779en_AU
dc.language.isoenen_AU
dc.publisherU.S. Department of the Interior and U.S. Geological Surveyen_AU
dc.subjectEvolutionen_AU
dc.subjectEvaporationen_AU
dc.subjectSpainen_AU
dc.subjectSalinityen_AU
dc.subjectSedimentary basinsen_AU
dc.subjectGypsumen_AU
dc.subjectHaliteen_AU
dc.subjectAquatic ecosystemsen_AU
dc.titleMarine to lacustrine evolution in an evaporitic environment: the late miocene Lorca Basin, Spainen_AU
dc.typeConference Abstracten_AU
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