Strain localization and fluid-assisted deformation in apatite and its influence on trace elements and U–Pb systematics.

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MetadadosDescriçãoIdioma
Autor(es): dc.creatorRibeiro, Bruno Vieira-
Autor(es): dc.creatorLagoeiro, Leonardo Evangelista-
Autor(es): dc.creatorFaleiros, Frederico Meira-
Autor(es): dc.creatorHunter, Nicholas J. R.-
Autor(es): dc.creatorQueiroga, Gláucia Nascimento-
Autor(es): dc.creatorRaveggi, M.-
Autor(es): dc.creatorCawood, Peter Anthony-
Autor(es): dc.creatorFinch, M.-
Autor(es): dc.creatorCampanha, Ginaldo Ademar da Cruz-
Data de aceite: dc.date.accessioned2022-02-21T19:59:17Z-
Data de disponibilização: dc.date.available2022-02-21T19:59:17Z-
Data de envio: dc.date.issued2021-08-16-
Data de envio: dc.date.issued2021-08-16-
Data de envio: dc.date.issued2019-
Fonte completa do material: dc.identifierhttp://www.repositorio.ufop.br/jspui/handle/123456789/13481-
Fonte completa do material: dc.identifierhttps://www.sciencedirect.com/science/article/abs/pii/S0012821X20303654-
Fonte completa do material: dc.identifierhttps://doi.org/10.1016/j.epsl.2020.116421-
Fonte: dc.identifier.urihttp://educapes.capes.gov.br/handle/capes/650775-
Descrição: dc.descriptionThis paper presents electron backscatter diffraction (EBSD), trace element and U–Pb data of apatite grains from a granitic mylonite from the Taxaquara Shear Zone (SE Brazil). The mylonite recrystallized under upper-greenschist facies and presents two types of apatite with distinct microstructures. Type1 apatite appears in quartz-rich layers and does not exhibit any microstructural, crystallographic, or chemical evidence of deformation/recrystallization, and resembles the original igneous apatite. Type2 apatite appears in mica-rich layers and exhibits core-and-mantle microstructures, and intragranular subgrain development, suggesting that they have undergone dynamic recrystallization. Recrystallized tails of type-2 apatite grains exhibit a strong c-axis crystallographic preferred orientation parallel to the X-direction (stretching lineation), and lack evidence of dislocation density. This evidence from type-2 apatite grains, combined with REE depletion, high La and a negative Ce anomaly compared to type-1 grains, suggests that type-2 apatite tails underwent recrystallization via dissolution-precipitation creep, whereas parental grains underwent crystal-plastic deformation and subgrain formation through dynamic recrystallization. Phase-equilibrium modelling and quartz CPO opening-angle thermometry are consistent with recrystallization at ∼480 – 530◦C and 2.2 – 5.0 kbar. We were not able to determine precise deformation ages from type-2 apatite because fluid-assisted recrystallization appears to have substantially decreased the U/Pb ratio. We find that preferential fluid flow along high-strain, biotite-rich layers in the mylonite caused type-2 apatite to recrystallise, whereas type-1 apatite in low strain layers was unaffected and retained the characteristics of the protolith.-
Formato: dc.formatapplication/pdf-
Idioma: dc.languageen-
Direitos: dc.rightsrestrito-
Palavras-chave: dc.subjectMicrostructures-
Palavras-chave: dc.subjectApatite recrystallization-
Palavras-chave: dc.subjectEBSD - electron backscatter diffraction-
Palavras-chave: dc.subjectDynamic recrystallization-
Palavras-chave: dc.subjectFluid-assisted recrystallization-
Título: dc.titleStrain localization and fluid-assisted deformation in apatite and its influence on trace elements and U–Pb systematics.-
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