Sedimentary evolution of tectonically-controlled Cenozoic shallow marine glaucony, fluviatile and lacustrine-palustrine deposits at Bahariya region, Egypt

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dc.contributor.authorAfify, A.M.
dc.contributor.authorSanz Montero, M. Esther
dc.contributor.authorGonzález Acebrón, Laura
dc.contributor.authorMuñoz García, María Belén
dc.date.accessioned2023-06-22T10:41:41Z
dc.date.available2023-06-22T10:41:41Z
dc.date.issued2022-06
dc.description.abstractThe Cenozoic basin of the tectonically-active Bahariya region (Western Desert, Egypt) contains a unique paleoenvironmental, paleotectonic and paleoclimatic record displaying a large variety of sedimentary facies, stratigraphic discontinuities, and geochemical changes. This study deals with the sedimentary evolution and tectono-stratigraphic modelling of shallow marine Upper Eocene glaucony facies (Upper Hamra Formation) that changes upward into a sequence of Oligocene continental fluviatile sandstone-calcrete (Radwan Formation) and then into Miocene lacustrine-palustrine deposits (Continental Carbonate Unit). The tectonic instability of the Bahariya basin can be deduced from occurrence of sedimentary discontinuities, development of pedogenic features, and unconformable relations among rock units. Both sedimentation pattern and facies distribution seem to have been controlled by fault activity through time. Two types of glaucony facies (pelloidal and massive smectitic glaucony) were deposited in a narrow sub-basin along main faults reaching the basin center. These faults also conditioned the deposition of the Oligocene fluviatile sandstone and Miocene lacustrine-palustrine carbonates. A transition from greenhouse (global warming event of the Middle Eocene Climatic Optimum) to icehouse climatic conditions (Eocene-Oligocene climatic cooling) is probably represented by the deposition of the shallow marine glaucony facies during the Priabonian. Semi-arid to sub-humid conditions were dominant during the formation of the Oligocene calcretes and the Miocene lacustrine-palustrine carbonates. The latter carbonate deposits consist of basal thin-bedded chert deposits displaying hydro-plastic sedimentary structures that are possibly coeval with the Miocene basaltic extrusions along faulted and low-lying areas. We conclude that both paleoclimate and intraplate tectonic activity related to the Red Sea rifting influenced the pattern of sea level, continental drainage, sedimentation rate and clastic supply since the Priabonian up to the middle Miocene in the Bahariya basin.
dc.description.departmentDepto. de Geodinámica, Estratigrafía y Paleontología
dc.description.departmentDepto. de Mineralogía y Petrología
dc.description.facultyFac. de Ciencias Geológicas
dc.description.refereedTRUE
dc.description.sponsorshipUniversidad Complutense de Madrid
dc.description.sponsorshipEgyptian Government
dc.description.statuspub
dc.eprint.idhttps://eprints.ucm.es/id/eprint/71854
dc.identifier.doi10.1016/j.jafrearsci.2022.104525
dc.identifier.issn1464-343X
dc.identifier.officialurlhttps://doi.org/10.1016/j.jafrearsci.2022.104525
dc.identifier.urihttps://hdl.handle.net/20.500.14352/71405
dc.issue.number104525
dc.journal.titleJournal of African earth sciences
dc.language.isoeng
dc.publisherElsevier Science
dc.relation.projectIDResearch Group UCM-910404
dc.rights.accessRightsrestricted access
dc.subject.cdu551.31“623”(620)
dc.subject.keywordGlaucony
dc.subject.keywordLacustrine-palustrine sediments
dc.subject.keywordTectonostratigraphy-sedimentary evolution
dc.subject.keywordCenozoic
dc.subject.keywordBahariya
dc.subject.keywordEgypt
dc.subject.ucmGeología estratigráfica
dc.subject.ucmPetrología
dc.subject.unesco2506.19 Estratigrafía
dc.titleSedimentary evolution of tectonically-controlled Cenozoic shallow marine glaucony, fluviatile and lacustrine-palustrine deposits at Bahariya region, Egypt
dc.typejournal article
dc.volume.number190
dspace.entity.typePublication
relation.isAuthorOfPublication2fb1dff4-b4f0-4016-be4d-86ea407ff58c
relation.isAuthorOfPublication4b36aa1d-df35-4e4c-8f4b-a301f7a25222
relation.isAuthorOfPublication.latestForDiscovery2fb1dff4-b4f0-4016-be4d-86ea407ff58c
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