Geochronological Constraints On The Age Of A Permo-triassic Impact Event: U-pb And 40ar/ 39ar Results For The 40km Araguainha Structure Of Central Brazil

dc.creatorTohver E.
dc.creatorLana C.
dc.creatorCawood P.A.
dc.creatorFletcher I.R.
dc.creatorJourdan F.
dc.creatorSherlock S.
dc.creatorRasmussen B.
dc.creatorTrindade R.I.F.
dc.creatorYokoyama E.
dc.creatorSouza Filho C.R.
dc.creatorMarangoni Y.
dc.date2012
dc.date2015-06-26T20:29:15Z
dc.date2015-11-26T14:25:46Z
dc.date2015-06-26T20:29:15Z
dc.date2015-11-26T14:25:46Z
dc.date.accessioned2018-03-28T21:28:27Z
dc.date.available2018-03-28T21:28:27Z
dc.identifier
dc.identifierGeochimica Et Cosmochimica Acta. , v. 86, n. , p. 214 - 227, 2012.
dc.identifier167037
dc.identifier10.1016/j.gca.2012.03.005
dc.identifierhttp://www.scopus.com/inward/record.url?eid=2-s2.0-84860568580&partnerID=40&md5=838b3ef4f00c9e1a8d9bac4302497b79
dc.identifierhttp://www.repositorio.unicamp.br/handle/REPOSIP/96957
dc.identifierhttp://repositorio.unicamp.br/jspui/handle/REPOSIP/96957
dc.identifier2-s2.0-84860568580
dc.identifier.urihttp://repositorioslatinoamericanos.uchile.cl/handle/2250/1245844
dc.descriptionImpact cratering has been a fundamental geological process in Earth history with major ramifications for the biosphere. The complexity of shocked and melted rocks within impact structures presents difficulties for accurate and precise radiogenic isotope age determination, hampering the assessment of the effects of an individual event in the geological record. We demonstrate the utility of a multi-chronometer approach in our study of samples from the 40km diameter Araguainha impact structure of central Brazil. Samples of uplifted basement granite display abundant evidence of shock deformation, but U/Pb ages of shocked zircons and the 40Ar/ 39Ar ages of feldspar from the granite largely preserve the igneous crystallization and cooling history. Mixed results are obtained from in situ 40Ar/ 39Ar spot analyses of shocked igneous biotites in the granite, with deformation along kink-bands resulting in highly localized, partial resetting in these grains. Likewise, spot analyses of perlitic glass from pseudotachylitic breccia samples reflect a combination of argon inheritance from wall rock material, the age of the glass itself, and post-impact devitrification. The timing of crater formation is better assessed using samples of impact-generated melt rock where isotopic resetting is associated with textural evidence of melting and in situ crystallization. Granular aggregates of neocrystallized zircon form a cluster of ten U-Pb ages that yield a " Concordia" age of 247.8±3.8Ma. The possibility of Pb loss from this population suggests that this is a minimum age for the impact event. The best evidence for the age of the impact comes from the U-Th-Pb dating of neocrystallized monazite and 40Ar/ 39Ar step heating of three separate populations of post-impact, inclusion-rich quartz grains that are derived from the infill of miarolitic cavities. The 206Pb/ 238U age of 254.5±3.2Ma (2σ error) and 208Pb/ 232Th age of 255.2±4.8Ma (2σ error) of monazite, together with the inverse, 18 point isochron age of 254±10Ma (MSWD=0.52) for the inclusion-rich quartz grains yield a weighted mean age of 254.7±2.5Ma (0.99%, 2σ error) for the impact event. The age of the Araguainha crater overlaps with the timing of the Permo-Triassic boundary, within error, but the calculated energy released by the Araguainha impact is insufficient to be a direct cause of the global mass extinction. However, the regional effects of the Araguainha impact event in the Paraná-Karoo Basin may have been substantial. © 2012 Elsevier Ltd.
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dc.languageen
dc.publisher
dc.relationGeochimica et Cosmochimica Acta
dc.rightsfechado
dc.sourceScopus
dc.titleGeochronological Constraints On The Age Of A Permo-triassic Impact Event: U-pb And 40ar/ 39ar Results For The 40km Araguainha Structure Of Central Brazil
dc.typeArtículos de revistas


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