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Clay saline diagenesis in lake Plio-Pleistocene sediments rich in organic matter from the Guadix-Baza Basin (Betic Cordillera, SE Spain).

dc.contributor.authorJiménez-Millán, Juan
dc.contributor.authorAbad, Isabel
dc.contributor.authorGarcía-Tortosa, Francisco Juan
dc.contributor.authorNieto, Fernando
dc.contributor.authorJiménez-Espinosa, Rosario
dc.date.accessioned2024-02-07T00:26:27Z
dc.date.available2024-02-07T00:26:27Z
dc.date.issued2020-06-11
dc.description.abstractThis study presents a mineralogical analysis of the effect of hypersaline lake environments rich in organic matter on the mineral transformations in sediments of the eastern part of the Guadix-Baza Basin (Betic Cordillera). Dark sediments with fragments of organic matter are rich in phyllosilicates (K-white mica, illite-smectite mixed layers, –I/S– minor amounts of paragonite, palygorskite, chlorite and kaolinite) and contain quartz, feldspars, and framboidal pyrite. X-ray diffraction patterns of I/S (R0 type, disordered) revealed a continuous between the positions of pure smectite and 30% of illite layers. Chemical composition of I/S mixed layers indicated a significant beidellitic substitution of Si by AlIV, Fe + Mg > 1 atoms per formula unit (a.p.f.u.) and K content up to 0.42 a.p.f.u. These data suggested the presence of a minor and variable amount of illitic layers among the major smectitic ones. Saline waters of the lake and the reducing environment of the sediment favored Mg and Fe2+ uptake, generating octahedral negative charge, which together with the beidellitic substitution would provide clay layer negative charge enough to admit K incorporation in the interlayer, hence the beginning of a diagenetic low temperature illitization.es_ES
dc.description.sponsorshipThis work has been financed by research projects PGC2018-094573- B-I00 and TASCUB (RTI2018-100737-B-I00) from the MCIU-AEIFEDER, and research groups RNM-325 and RNM-179 of the Junta de Andalucía. We acknowledge the suggestions and comments from two anonymous reviewers and from the editor (Dr. M.V. Villar). María del Mar Abad is especially recognized for helping with the HRTEM and for being able of providing us the AEM analyses during the COVID-19 lockdown. The “Centro de Instrumentación Científico-Técnica of the Universidad de Jaén” is aknowledged for the use of the PANalytical Empyrean diffractometer and the Merlin Carl Zeiss electron microscope. The use of the PANalytical X'Pert Pro diffractometer of the “Departamento de Mineralogía y Petrología, Universidad de Granada, Spain” is also acknowledge. The access to the HAADF FEI TITAN G2 microscope and the Philips CM20 (STEM) microscope was facilitated by the “Centro de Instrumentación Científica of the Universidad de Granada”. The “Instituto de Recursos Naturales y Agrobiología of Sevilla, CSIC” is acknowledged for provide organic carbon analyses.es_ES
dc.identifier.citationJiménez-Millán, J., Abad, I., García-Tortosa, F. J., Nieto, F., & Jiménez-Espinosa, R. (2020). Clay saline diagenesis in lake Plio-Pleistocene sediments rich in organic matter from the Guadix-Baza Basin (Betic Cordillera, SE Spain). Applied Clay Science, 195, 105739.es_ES
dc.identifier.issn0169-1317/1872-9053es_ES
dc.identifier.other10.1016/j.clay.2020.105739es_ES
dc.identifier.urihttps://doi.org/10.1016/j.clay.2020.105739es_ES
dc.identifier.urihttps://hdl.handle.net/10953/2131
dc.language.isoenges_ES
dc.publisherElsevieres_ES
dc.relation.ispartofApplied Clay Sciencees_ES
dc.rightsAtribución-NoComercial-SinDerivadas 3.0 España*
dc.rights.accessRightsinfo:eu-repo/semantics/openAccesses_ES
dc.rights.urihttp://creativecommons.org/licenses/by-nc-nd/3.0/es/*
dc.subjectAuthigenices_ES
dc.subjectEnvironmental conditionses_ES
dc.subjectIllitizationes_ES
dc.subjectIllite-smectite mixed-layerses_ES
dc.subjectPalygorskite X-ray diffractiones_ES
dc.titleClay saline diagenesis in lake Plio-Pleistocene sediments rich in organic matter from the Guadix-Baza Basin (Betic Cordillera, SE Spain).es_ES
dc.typeinfo:eu-repo/semantics/articlees_ES
dc.type.versioninfo:eu-repo/semantics/acceptedVersiones_ES

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