Crystal plasticity enhances trace element mobility in garnet
Access Status
Authors
Date
2022Type
Metadata
Show full item recordCitation
Source Title
Faculty
School
Collection
Abstract
Chemical heterogeneities along grain boundaries in garnet occur across a wide range of metamorphic conditions, yet the processes underlying their development remain poorly understood. Here we integrate electron backscattered diffraction (EBSD) and atom probe tomography (APT) to evaluate the mechanisms driving nanoscale trace element mobility to deformation microstructures in a granulite-facies garnet. This approach shows that low-angle boundaries can be enriched in Ca, Ti, P, Cu, K, Na, Cl, and H. Based on the correlation between EBSD and APT data, we propose that solute ions (Ca, Ti, P, and Cu) were segregated to the interface during the migration of dislocation associated with ductile deformation of the grain. In contrast, elements such as K, Na, Cl, and H are interpreted to reflect diffusion along the low-angle boundary from an externally derived fluid source. These results provide the missing link between chemical heterogeneity and deformation-related microstructures in garnet. Our approach shows that a combination of microstructural and nanoscale geochemical analyses can provide unprecedented insights into mechanisms of element transfer within minerals.
Related items
Showing items related by title, author, creator and subject.
-
Schmidt, A.; Pourteau, Amaury; Candan, O.; Oberhänsli, R. (2015)© 2015 Elsevier B.V. This study shows Lu-Hf geochronology of zoned garnet crystals contained in mica schists from the southern Menderes Massif, Turkey. Selected samples are four 3-5 cm large garnet megacrysts of which ...
-
Wang, L.; Guo, J.; Yin, C.; Peng, P.; Zhang, J.; Spencer, Christopher; Qian, J. (2018)The Liangcheng garnet granitoids are parautochthonous S-type granites that occur within granulite-facies metasediments in the ultrahigh-temperature (UHT) Jining Complex, eastern part of the Khondalite Belt, North China ...
-
Dorais, M.J.; Spencer, Christopher (2014)The Cardigan Pluton of New Hampshire exhibits a positive correlation between peraluminosity with maficity, with as much as 8% normative corundum in rocks with 53 wt.% SiO2. No mafic magmas of these compositions exist; the ...