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Metadados | Descrição | Idioma |
---|---|---|
Autor(es): dc.creator | Ribeiro, Bruno Vieira | - |
Autor(es): dc.creator | Lagoeiro, Leonardo Evangelista | - |
Autor(es): dc.creator | Faleiros, Frederico Meira | - |
Autor(es): dc.creator | Hunter, Nicholas J. R. | - |
Autor(es): dc.creator | Queiroga, Gláucia Nascimento | - |
Autor(es): dc.creator | Raveggi, M. | - |
Autor(es): dc.creator | Cawood, Peter Anthony | - |
Autor(es): dc.creator | Finch, M. | - |
Autor(es): dc.creator | Campanha, Ginaldo Ademar da Cruz | - |
Data de aceite: dc.date.accessioned | 2022-02-21T19:59:17Z | - |
Data de disponibilização: dc.date.available | 2022-02-21T19:59:17Z | - |
Data de envio: dc.date.issued | 2021-08-16 | - |
Data de envio: dc.date.issued | 2021-08-16 | - |
Data de envio: dc.date.issued | 2019 | - |
Fonte completa do material: dc.identifier | http://www.repositorio.ufop.br/jspui/handle/123456789/13481 | - |
Fonte completa do material: dc.identifier | https://www.sciencedirect.com/science/article/abs/pii/S0012821X20303654 | - |
Fonte completa do material: dc.identifier | https://doi.org/10.1016/j.epsl.2020.116421 | - |
Fonte: dc.identifier.uri | http://educapes.capes.gov.br/handle/capes/650775 | - |
Descrição: dc.description | This 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.format | application/pdf | - |
Idioma: dc.language | en | - |
Direitos: dc.rights | restrito | - |
Palavras-chave: dc.subject | Microstructures | - |
Palavras-chave: dc.subject | Apatite recrystallization | - |
Palavras-chave: dc.subject | EBSD - electron backscatter diffraction | - |
Palavras-chave: dc.subject | Dynamic recrystallization | - |
Palavras-chave: dc.subject | Fluid-assisted recrystallization | - |
Título: dc.title | Strain localization and fluid-assisted deformation in apatite and its influence on trace elements and U–Pb systematics. | - |
Aparece nas coleções: | Repositório Institucional - UFOP |
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