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Dedolomitization and other early diagenetic processes in Miocene lacustrine deposits, Ebro Basin (Spain)

dc.contributor.authorArenas, C.
dc.contributor.authorAlonso Zarza, Ana María
dc.contributor.authorPardo, G.
dc.date.accessioned2024-11-27T08:33:09Z
dc.date.available2024-11-27T08:33:09Z
dc.date.issued1999
dc.description.abstractA variety of meteoric diagenetic features reveal the development of a syngenetic karst on lacustrine deposits of the Ebro Basin. Diagenetic processes that operated on lacustrine laminated and stromatolitic carbonates include the following. (1) A first syndepositional stage with processes such as dolomitization, desiccation and related breccia formation and sulphate precipitation, either as lenticular gypsum crystals or nodules. This stage took place under progressive evaporation due to lake level fall, when the previous carbonate deposits became exposed as a supra-littoral fringe surrounding saline mud flats of adjacent sulphate depositional environments. (2) A second early diagenetic stage in which processes such as sulphate dissolution and collapse brecciation, dedolomitization, calcite spar cementation and silicification occurred as a result of meteoric water input that caused a progressive rise in lake level. Light isotopic compositions (δ13C and δ18O) of diagenetic calcites, versus heavier compositions in primary laminated and stromatolitic limestones, confirm a meteoric influence. The syngenetic karst is best developed at the boundary between two allostratigraphic units and coincided with one of the extensive stages of sulphate deposition at the end of the Early Miocene. The karst facies occurred in an area that was a low-relief barrier that separated two sites of sulphate deposition during low lake levels. This indicates that the karst development was controlled by topographic changes within the basin and record a shift from arid to wetter climatic conditions, as suggested by the overlying freshwater carbonate deposits. The presence of diagenetic features such as those described in the central Ebro Basin affecting saline lacustrine carbonates is relevant because they can be used as indicators of subaerial exposure periods in terrestrial environments and they also reveal important palaeogeographic and palaeoclimatic events of basinal extent.
dc.description.departmentDepto. de Mineralogía y Petrología
dc.description.facultyFac. de Ciencias Geológicas
dc.description.refereedTRUE
dc.description.sponsorshipDirección General de Investigación Científica y Técnica (España)
dc.description.statuspub
dc.identifier.citationArenas, Alonso Zarza y Pardo (1999) «Dedolomitization and other early diagenetic processes in Miocene lacustrine deposits, Ebro Basin (Spain)», Sedimentary Geology, 125(1-2), pp. 23-45. Disponible en: https://doi.org/10.1016/S0037-0738(98)00146-8.
dc.identifier.doi10.1016/S0037-0738(98)00146-8
dc.identifier.issn0037-0738
dc.identifier.officialurlhttps://doi.org/10.1016/S0037-0738(98)00146-8
dc.identifier.relatedurlhttps://www.sciencedirect.com/science/article/pii/S0037073898001468?via%3Dihub
dc.identifier.urihttps://hdl.handle.net/20.500.14352/111113
dc.issue.number1-2
dc.journal.titleSedimentary Geology
dc.language.isoeng
dc.page.final45
dc.page.initial23
dc.publisherElsevier
dc.relation.projectIDinfo:eu-repo/grantAgreement/DGICYT//PB93-0580
dc.rights.accessRightsrestricted access
dc.subject.cdu552.5(460)"628.42"
dc.subject.keywordMeteoric diagenesis
dc.subject.keywordDedolomitization
dc.subject.keywordSyngenetic karst
dc.subject.keywordSaline lakes
dc.subject.keywordPalaeoclimatic change
dc.subject.keywordMiocene
dc.subject.keywordEbro Basin
dc.subject.ucmGeología
dc.subject.ucmPetrología
dc.subject.unesco2506 Geología
dc.subject.unesco2506.14 Petrología Sedimentaria
dc.titleDedolomitization and other early diagenetic processes in Miocene lacustrine deposits, Ebro Basin (Spain)
dc.typejournal article
dc.type.hasVersionVoR
dc.volume.number125
dspace.entity.typePublication
relation.isAuthorOfPublicationf29ff48e-a667-4a09-89eb-a8c1b3d55083
relation.isAuthorOfPublication.latestForDiscoveryf29ff48e-a667-4a09-89eb-a8c1b3d55083

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