Mechanical twinning of monazite expels ...
Document type :
Article dans une revue scientifique
DOI :
Permalink :
Title :
Mechanical twinning of monazite expels radiogenic lead
Author(s) :
Fougerouse, D. [Auteur]
Curtin University
Reddy, S.M. [Auteur]
Curtin University
Seydoux-Guillaume, A.-M. [Auteur]
Laboratoire de Géologie de Lyon - Terre, Planètes, Environnement [LGL-TPE]
Kirkland, C.L. [Auteur]
Curtin University
Erickson, T.M. [Auteur]
NASA Johnson Space Center [JSC]
Curtin University
Saxey, D.W. [Auteur]
Curtin University
Rickard, W.D.A. [Auteur]
Curtin University
Jacob, Damien [Auteur]
Unité Matériaux et Transformations - UMR 8207 [UMET]
Leroux, Hugues [Auteur]
Unité Matériaux et Transformations - UMR 8207 [UMET]
Clark, C. [Auteur]
Curtin University
Curtin University
Reddy, S.M. [Auteur]
Curtin University
Seydoux-Guillaume, A.-M. [Auteur]
Laboratoire de Géologie de Lyon - Terre, Planètes, Environnement [LGL-TPE]
Kirkland, C.L. [Auteur]
Curtin University
Erickson, T.M. [Auteur]
NASA Johnson Space Center [JSC]
Curtin University
Saxey, D.W. [Auteur]
Curtin University
Rickard, W.D.A. [Auteur]
Curtin University
Jacob, Damien [Auteur]
Unité Matériaux et Transformations - UMR 8207 [UMET]
Leroux, Hugues [Auteur]
Unité Matériaux et Transformations - UMR 8207 [UMET]
Clark, C. [Auteur]
Curtin University
Journal title :
Geology
Publisher :
Geological Society of America
Publication date :
2020-11-25
HAL domain(s) :
Planète et Univers [physics]/Sciences de la Terre/Géophysique [physics.geo-ph]
English abstract : [en]
Mechanical twins form by the simple shear of the crystal lattice during deformation. In order to test the potential of narrow twins in monazite to record the timing of their formation, we investigated a ca. 1700 Ma monazite ...
Show more >Mechanical twins form by the simple shear of the crystal lattice during deformation. In order to test the potential of narrow twins in monazite to record the timing of their formation, we investigated a ca. 1700 Ma monazite grain (from the Sandmata Complex, Rajasthan, India) deformed at ca. 980 Ma, by electron backscattered diffraction (EBSD), transmission electron microscopy (TEM), and atom probe tomography (APT). APT 208Pb/232Th ages indicate that the twin was entirely reset by radiogenic Pb loss during its formation at conditions far below the monazite closure temperature. The results are consistent with a model where Pb is liberated during rupture of rare earth element–oxygen (REE-O) bonds in the large [REE]O9 polyhedra during twinning. Liberated Pb likely migrated along fast diffusion pathways such as crystal defects. The combination of a quantitative microstructural investigation and nano-geochronology provides a new approach for understanding the history of accessory phases.Show less >
Show more >Mechanical twins form by the simple shear of the crystal lattice during deformation. In order to test the potential of narrow twins in monazite to record the timing of their formation, we investigated a ca. 1700 Ma monazite grain (from the Sandmata Complex, Rajasthan, India) deformed at ca. 980 Ma, by electron backscattered diffraction (EBSD), transmission electron microscopy (TEM), and atom probe tomography (APT). APT 208Pb/232Th ages indicate that the twin was entirely reset by radiogenic Pb loss during its formation at conditions far below the monazite closure temperature. The results are consistent with a model where Pb is liberated during rupture of rare earth element–oxygen (REE-O) bonds in the large [REE]O9 polyhedra during twinning. Liberated Pb likely migrated along fast diffusion pathways such as crystal defects. The combination of a quantitative microstructural investigation and nano-geochronology provides a new approach for understanding the history of accessory phases.Show less >
Language :
Anglais
Peer reviewed article :
Oui
Audience :
Non spécifiée
Administrative institution(s) :
Université de Lille
CNRS
INRA
ENSCL
CNRS
INRA
ENSCL
Collections :
Research team(s) :
Matériaux Terrestres et Planétaires
Submission date :
2021-03-11T16:45:23Z
2021-03-12T10:54:51Z
2021-03-12T10:54:51Z
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