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The transition from Pangea amalgamation to fragmentation: Constraints from detrital zircon geochronology on West Iberia paleogeography and sediment sources

2018-11Journal article Restricted access
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dc.contributor.authorDinis, Pedro A.
dc.contributor.authorFernandes, Paulo
dc.contributor.authorJorge, Raul C. G. S.
dc.contributor.authorRodrigues, Bruno
dc.contributor.authorChew, David M.
dc.contributor.authorTassinari, Colombo G.
dc.date.accessioned2018-12-07T14:57:53Z
dc.date.available2018-12-07T14:57:53Z
dc.date.issued2018-11
dc.description.abstractDetrital zircon U-Pb geochronology data from late Carboniferous to Triassic clastic sedimentary rocks in SW Iberia were used to investigate the regional paleogeography during the transition from Pangea amalgamation to breakup. The major U-Pb zircon age peaks are middle Devonian to Carboniferous (similar to 390-300 Ma), Cambrian Ordovician (similar to 530-440 Ma), Cryogenian-Ediacaran (similar to 750-540 Ma), Stenian-Tonian (similar to 1.2-0.9 Ga) and Paleoproterozoic (similar to 2.3-1.8 Ga). Rapid exhumation of Variscan crystalline rocks at the contact between the South Portuguese zone and Ossa Morena Zone, explains the abundance of late Paleozoic ages in the upper Carboniferous-lower Permian continental successions. The U-Pb zircon data constrain the maximum depositional age of the Santa Susana Basin to c. 304 Ma and the Viar Basin to c. 297 Ma. The Triassic sequences, despite being c. 100 Ma younger than the Variscan tectonothermal events, contain low proportions of late Paleozoic zircon. The major peaks in all zircon spectra closely resemble those found in the adjacent basement rocks, indicating small source areas, mainly located near the rift shoulders. Longer travelled fluvial systems are postulated for the eastern portions of the Algarve Basin, which was closer to the westward advancing Tethys Ocean than the rift basins of West Iberia. Sequences that contain significant proportions of similar to 1.2-0.9 Ga zircon are probably recycled from post-collisional Carboniferous-Permian continental deposits that were more extensive than those found today. (C) 2017 Elsevier B.V. All rights reserved.
dc.description.sponsorshipPortuguese Foundation for Science and Technology (FCT) [SFRH/BSAB/1233/2011]; Iberoamerican Santander (Banco Santander) grant; Science Foundation Ireland [12/IP/1663];
dc.identifier.doi10.1016/j.sedgeo.2017.09.015
dc.identifier.issn0037-0738
dc.identifier.issn1879-0968
dc.identifier.urihttp://hdl.handle.net/10400.1/11753
dc.language.isoeng
dc.peerreviewedyes
dc.publisherElsevier Science
dc.relationINTEGRATED THERMOCHRONOLOGY AND ORGANIC MATURATION STUDIES IN THE SOUTH PORTUGUESE ZONE AND ALGARVE BASIN SOUTH PORTUGAL
dc.subjectSouth Portuguese Zone
dc.subjectU-Pb Zircon
dc.subjectNorthern Gondwana Margin
dc.subjectEarly Ordovician Magmatism
dc.subjectAlentejo Flysch Group
dc.subjectOssa-Morena Zone
dc.subjectVariscan Belt
dc.subjectNw Iberia
dc.subjectArmorica Microplate
dc.subjectPermian Magmatism
dc.titleThe transition from Pangea amalgamation to fragmentation: Constraints from detrital zircon geochronology on West Iberia paleogeography and sediment sources
dc.typejournal article
dspace.entity.typePublication
oaire.awardTitleINTEGRATED THERMOCHRONOLOGY AND ORGANIC MATURATION STUDIES IN THE SOUTH PORTUGUESE ZONE AND ALGARVE BASIN SOUTH PORTUGAL
oaire.awardURIinfo:eu-repo/grantAgreement/FCT//SFRH%2FBD%2F62213%2F2009/PT
oaire.awardURIinfo:eu-repo/grantAgreement/FCT/5876/UID%2FMAR%2F04292%2F2013/PT
oaire.citation.endPage187
oaire.citation.startPage172
oaire.citation.titleSedimentary Geology
oaire.citation.volume375
oaire.fundingStream5876
person.familyNameFernandes
person.familyNameRodrigues
person.givenNamePaulo
person.givenNameBruno
person.identifier422469
person.identifier.ciencia-id051D-A133-65D9
person.identifier.orcid0000-0003-4888-0230
person.identifier.orcid0000-0002-3896-3369
person.identifier.ridJ-6577-2014
person.identifier.scopus-author-id57197129025
person.identifier.scopus-author-id55936487400
project.funder.identifierhttp://doi.org/10.13039/501100001871
project.funder.identifierhttp://doi.org/10.13039/501100001871
project.funder.nameFundação para a Ciência e a Tecnologia
project.funder.nameFundação para a Ciência e a Tecnologia
rcaap.rightsrestrictedAccess
rcaap.typearticle
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