Please use this identifier to cite or link to this item: http://hdl.handle.net/2122/13630
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dc.date.accessioned2020-06-15T05:27:36Z-
dc.date.available2020-06-15T05:27:36Z-
dc.date.issued2020-05-18-
dc.identifier.urihttp://hdl.handle.net/2122/13630-
dc.description.abstractNumerous studies exist on exhumed tectonic mélanges along subduction channels whereas, in accretionary wedge interiors, deformation mechanisms and related fluid circulation in tectonic mélanges are still underexplored. We combine structural and microstructural observations with geochemical (stable and clumped isotopes and isotope composition of noble gases in fluid inclusions of calcite veins) and U-Pb geochronological data to define deformation mechanisms and syn-tectonic fluid circulation within the Mt. Massico intra-wedge tectonic mélange, located in the inner part of the central-southern Apennines accretionary wedge, Italy. This mélange developed by shear deformation at the base of a clastic succession. Deformation was characterized by disruption of the primary bedding, mixing, and deformation of relicts of competent olistoliths and strata within a weak matrix of deformed clayey and marly interbeds. Recurrent cycles of mutually overprinting fracturing/veining and pressure-solution processes generated a block-in-matrix texture. The geochemical signatures of syntectonic calcite veins suggest calcite precipitation in a closed system from warm (108°-147 °C) paleofluids, with δ18O vlaues between þ9‰ and 14‰, such as trapped pore waters after extensive 18O exchange with the local limestone host rock and/or derived by clay dehydration processes at T > 120 °C. The 3He/4He ratios in fluid inclusions are lower than 0.1 Ra, indicating that He was exclusively sourced from the crust. We conclude that: (1) intraformational rheological contrasts, inherited trapped fluids, and low-permeability barriers such as marlyshaly matrix, can promote the generation of intra-wedge tectonic mélanges and the development of transient fluid overpressure; (2) clay-rich tectonic mélanges, developed along intra-wedge décollement layers, may generate low-permeability barriers hindering the fluid redistribution within accretionary wedges.en_US
dc.language.isoEnglishen_US
dc.publisher.nameElsevieren_US
dc.relation.ispartofJournal of Structural Geologyen_US
dc.relation.ispartofseries/138 (2020)en_US
dc.subjectTectonic mélangeen_US
dc.subjectFluid-rock interactionen_US
dc.subjectStable and clumped isotopesen_US
dc.subjectNoble gasesen_US
dc.subjectFold and thrust belten_US
dc.titleThe role of trapped fluids during the development and deformation of a carbonate/shale intra-wedge tectonic mélange (Mt. Massico, Southern Apennines, Italy)en_US
dc.typearticleen
dc.description.statusPublisheden_US
dc.type.QualityControlPeer-revieweden_US
dc.description.pagenumber104086en_US
dc.subject.INGV04.04. Geologyen_US
dc.identifier.doi10.1016/j.jsg.2020.104086en_US
dc.description.obiettivoSpecifico1T. Struttura della Terraen_US
dc.description.obiettivoSpecifico2T. Deformazione crostale attivaen_US
dc.description.journalTypeJCR Journalen_US
dc.relation.issn0191-8141en_US
dc.contributor.authorSmeraglia, Luca-
dc.contributor.authorAldega, Luca-
dc.contributor.authorBernasconi, Stefano-
dc.contributor.authorBilli, Andrea-
dc.contributor.authorBoschi, Chiara-
dc.contributor.authorCaracausi, Antonio-
dc.contributor.authorCarminati, Eugenio-
dc.contributor.authorFranchini, Stefania-
dc.contributor.authorRizzo, Andrea Luca-
dc.contributor.authorRossetti, Federico-
dc.contributor.authorVignaroli, Gianluca-
dc.contributor.departmentConsiglio Nazionale delle Ricercheen_US
dc.contributor.departmentUniversità La sapienza Romaen_US
dc.contributor.departmentETH Zürichen_US
dc.contributor.departmentConsiglio Nazionale delle Ricercheen_US
dc.contributor.departmentConsiglio Nazionale delle Ricercheen_US
dc.contributor.departmentIstituto Nazionale di Geofisica e Vulcanologia (INGV), Sezione Palermo, Palermo, Italiaen_US
dc.contributor.departmentConsiglio Nazionale delle Ricercheen_US
dc.contributor.departmentConsiglio Nazionale delle Ricercheen_US
dc.contributor.departmentIstituto Nazionale di Geofisica e Vulcanologia (INGV), Sezione Palermo, Palermo, Italiaen_US
dc.contributor.departmentUniversità Roma Treen_US
dc.contributor.departmentUniversità degli Studi di Bolognaen_US
item.openairetypearticle-
item.cerifentitytypePublications-
item.languageiso639-1en-
item.grantfulltextrestricted-
item.openairecristypehttp://purl.org/coar/resource_type/c_18cf-
item.fulltextWith Fulltext-
crisitem.author.deptIstituto Nazionale di Geofisica e Vulcanologia (INGV), Sezione Palermo, Palermo, Italia-
crisitem.author.deptConsiglio Nazionale delle Ricerche-
crisitem.author.deptIstituto Nazionale di Geofisica e Vulcanologia (INGV), Sezione Milano, Milano, Italia-
crisitem.author.deptUniversità Roma Tre-
crisitem.author.deptDipartimento di Scienze Biologiche, Geologiche e Ambientali - Università di Bologna - Italy-
crisitem.author.orcid0000-0001-7672-8856-
crisitem.author.orcid0000-0002-6368-1873-
crisitem.author.orcid0000-0001-8972-4432-
crisitem.author.orcid0000-0003-2510-2890-
crisitem.author.orcid0000-0002-1623-0711-
crisitem.author.orcid0000-0003-2225-3781-
crisitem.author.orcid0000-0001-7345-6162-
crisitem.author.parentorgIstituto Nazionale di Geofisica e Vulcanologia-
crisitem.author.parentorgIstituto Nazionale di Geofisica e Vulcanologia-
crisitem.classification.parent04. Solid Earth-
crisitem.department.parentorgIstituto Nazionale di Geofisica e Vulcanologia-
crisitem.department.parentorgIstituto Nazionale di Geofisica e Vulcanologia-
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