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Deformation bands and alteration in porous glass-rich volcaniclastics: Insights from Milos, Greece

dc.rights.licenseopenen_US
hal.structure.identifierEnvironnements et Paléoenvironnements OCéaniques [EPOC]
dc.contributor.authorLEROY, Etienne
hal.structure.identifierEnvironnements et Paléoenvironnements OCéaniques [EPOC]
dc.contributor.authorCAVAILHES, Thibault
hal.structure.identifierInstitut de Mécanique et d'Ingénierie [I2M]
dc.contributor.authorANGUY, Yannick
IDREF: 129650307
hal.structure.identifierGéosciences Montpellier
dc.contributor.authorSOLIVA, R.
hal.structure.identifierDepartment of Earth Science [Bergen] [UiB]
dc.contributor.authorROTEVATN, A.
hal.structure.identifierInstitut de Mécanique et d'Ingénierie [I2M]
dc.contributor.authorGABORIEAU, Cecile
IDREF: 161801544
dc.date.accessioned2024-01-24T15:02:44Z
dc.date.available2024-01-24T15:02:44Z
dc.date.issued2023
dc.identifier.issn0191-8141en_US
dc.identifier.urihttps://oskar-bordeaux.fr/handle/20.500.12278/187494
dc.description.abstractEnDeformation bands in porous volcaniclastics are little studied structural heterogeneities despite their relevance for constraining the modalities of deformation development and related fluid-rock interactions in volcanic areas.We document a dense network of normal-sense Deformation Bands (Normal-sense Compactional Shear Bands (NCSBs) affecting upper Pliocene felsic glassy tuffites in Milos, Greece. NCSBs probably formed between 300 and 500 m of burial depth, in response to NE-SW directed extension which is related to volcanic rift development in the area. They accommodate mm-to m-shear-offsets, trend either N105 ± 10° or N070 ± 10°, and show mutual cross-cutting relations. The NCSB fault rock is made of ultracataclasite in which the cataclastic mechanisms have affected both the mineral fraction and the volcanic glass. Minerals are fractured along their cleavages whereas pumices are interestingly fractured along their vesicles.The development of chemical alteration (dissolution and cementation) essentially into the ultracataclasite is expressed through glass-hosted corrosion gulfs and smectites filling the intergranular porosity. These observations support that NCSBs preferentially retained water, have been the seat of greater fluid flow, and are the locus of ongoing phyllosilicate self-sealing in the vadose zone. A significant decrease (up to one order of magnitude) in porosity is measured within the studied NCSBs
dc.language.isoENen_US
dc.subject.enFault
dc.subject.encataclasis
dc.subject.enCorrosion gulfs
dc.subject.enSmectites
dc.subject.enSealing
dc.title.enDeformation bands and alteration in porous glass-rich volcaniclastics: Insights from Milos, Greece
dc.typeArticle de revueen_US
dc.identifier.doi10.1016/j.jsg.2023.104982en_US
dc.subject.halPlanète et Univers [physics]/Sciences de la Terre/Géophysique [physics.geo-ph]en_US
dc.subject.halPlanète et Univers [physics]/Sciences de la Terre/Volcanologieen_US
bordeaux.journalJournal of Structural Geologyen_US
bordeaux.page104982en_US
bordeaux.volume177en_US
bordeaux.hal.laboratoriesEPOC : Environnements et Paléoenvironnements Océaniques et Continentaux - UMR 5805en_US
bordeaux.institutionUniversité de Bordeauxen_US
bordeaux.institutionCNRSen_US
bordeaux.peerReviewedouien_US
bordeaux.inpressnonen_US
bordeaux.import.sourcehal
hal.identifierhal-04286794
hal.version1
hal.popularnonen_US
hal.audienceInternationaleen_US
hal.exportfalse
workflow.import.sourcehal
dc.rights.ccPas de Licence CCen_US
bordeaux.COinSctx_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.jtitle=Journal%20of%20Structural%20Geology&rft.date=2023&rft.volume=177&rft.spage=104982&rft.epage=104982&rft.eissn=0191-8141&rft.issn=0191-8141&rft.au=LEROY,%20Etienne&CAVAILHES,%20Thibault&ANGUY,%20Yannick&SOLIVA,%20R.&ROTEVATN,%20A.&rft.genre=article


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