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dc.contributor.CRUESPUniversidade Estadual de Campinaspt_BR
dc.typeArtigo de periódicopt_BR
dc.titleFurther investigation of the initial fission-track length and geometry factor in apatite fission-track thermochronologypt_BR
dc.contributor.authorSoares, CJpt_BR
dc.contributor.authorGuedes, Spt_BR
dc.contributor.authorTello, CApt_BR
dc.contributor.authorLixandrao, ALpt_BR
dc.contributor.authorOsorio, AMpt_BR
dc.contributor.authorAlencar, Ipt_BR
dc.contributor.authorDias, ANCpt_BR
dc.contributor.authorHadler, Jpt_BR
unicamp.authorSoares, Cleber J. UNESP, IGCE, BR-13506900 Rio Claro, SP, Brazilpt_BR
unicamp.authorSoares, Cleber J. Guedes, Sandro Lixandrao Filho, Arnaldo L. Alencar, Igor Hadler, Julio Univ Estadual Campinas, Inst Fis Gleb Wataghin, BR-13083859 Campinas, SP, Brazilpt_BR
unicamp.authorTello, Carlos A. Osorio, Ana M. UNESP, FCT, Dept Fis Quim & Biol, BR-19060900 Presidente Prudente, SP, Brazilpt_BR
unicamp.authorDias, Airton N. C. Univ Fed Rio Grande do Sul, CPGq, Lab Geol Isotop, BR-91501970 Porto Alegre, RS, Brazilpt_BR
dc.subjectFission-track termochronologypt_BR
dc.subjectgeometry factorpt_BR
dc.subjectinitial fission-track lengthpt_BR
dc.subject.wosExternal Detectorpt_BR
dc.subject.wosDating Calibrationpt_BR
dc.subject.wosUnit Areapt_BR
dc.description.abstractThe external detector method (EDM) is a widely used technique in fission track thermochronology (FTT) in which two different minerals are concomitantly employed: spontaneous tracks are observed in apatite and induced ones in the muscovite external detector. They show intrinsic differences in detection and etching properties that should be taken into account. In this work, new geometry factor values, g, in apatite, were obtained by directly measuring the rho(ed)/rho(is) ratios and independently determined [GQR](ed/is) values through the measurement of projected lengths. Five mounts, two of which were large area prismatic sections and three samples composed of random-orientation pieces have been used to determine the g-values. A side effect of applying EDM is that the value of the initial confined induced fission track, L-0, is not measured in routine analyses. The L-0-value is an important parameter to quantify with good confidence the degree of annealing of the spontaneous fission tracks in unknown-age samples, and is essential for accurate thermal history modeling. The impact of using arbitrary L-0-values on the inference of sample thermal history is investigated and discussed. The measurement of the L-0-value for each sample to be dated using an extra irradiated apatite mount is proposed. This extra mount can be also used for determining the g value as an extension of the rho(ed)/rho(is) ratio method. Eight apatite samples from crystalline basement, with grains at random orientation, were used to determine the g-values. The results found are statistically in agreement with the values found for apatite samples (from Durango, Mexico) measured in prismatic section and also measured at random orientation. There was no observable variation in efficiency regarding crystal orientation, showing that it is relatively safe using non-prismatic grains, especially in samples with paucity of grains, as it is the case of most basin samples. Implications for the zeta-calibration and for the calibration of the direct (spectrometer-based) fission-track dating are also
dc.relation.ispartofAmerican Mineralogistpt_BR
dc.relation.ispartofabbreviationAm. Miner.pt_BR
dc.publisherMineralogical Soc Amerpt_BR
dc.identifier.citationAmerican Mineralogist. Mineralogical Soc Amer, v. 98, n. 41890, n. 1381, n. 1392, 2013.pt_BR
dc.sourceWeb of Sciencept_BR
dc.description.sponsorshipFundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)pt_BR
dc.description.sponsorshipConselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)pt_BR
dc.description.sponsorship1Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)pt_BR
dc.description.sponsorship1Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)pt_BR
dc.description.provenanceMade available in DSpace on 2014-07-30T17:47:17Z (GMT). No. of bitstreams: 0 Previous issue date: 2013en
dc.description.provenanceMade available in DSpace on 2015-11-26T17:46:45Z (GMT). No. of bitstreams: 0 Previous issue date: 2013en
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