Constraints from diffusion profiles on the duration of high-strain deformation in thickened crust
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Résumé
Research Article| August 01, 2009 Constraints from diffusion profiles on the duration of high-strain deformation in thickened crust A. Camacho; A. Camacho 1Department of Geological Sciences, University of Manitoba, Winnipeg, Manitoba R3T 2N2, Canada Search for other works by this author on: GSW Google Scholar P. Yang; P. Yang 1Department of Geological Sciences, University of Manitoba, Winnipeg, Manitoba R3T 2N2, Canada Search for other works by this author on: GSW Google Scholar A. Frederiksen A. Frederiksen 1Department of Geological Sciences, University of Manitoba, Winnipeg, Manitoba R3T 2N2, Canada Search for other works by this author on: GSW Google Scholar Author and Article Information A. Camacho 1Department of Geological Sciences, University of Manitoba, Winnipeg, Manitoba R3T 2N2, Canada P. Yang 1Department of Geological Sciences, University of Manitoba, Winnipeg, Manitoba R3T 2N2, Canada A. Frederiksen 1Department of Geological Sciences, University of Manitoba, Winnipeg, Manitoba R3T 2N2, Canada Publisher: Geological Society of America Received: 25 Dec 2008 Revision Received: 01 Apr 2009 Accepted: 02 Apr 2009 First Online: 03 Mar 2017 Online ISSN: 1943-2682 Print ISSN: 0091-7613 © 2009 Geological Society of America Geology (2009) 37 (8): 755–758. https://doi.org/10.1130/G25753A.1 Article history Received: 25 Dec 2008 Revision Received: 01 Apr 2009 Accepted: 02 Apr 2009 First Online: 03 Mar 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn Email Permissions Search Site Citation A. Camacho, P. Yang, A. Frederiksen; Constraints from diffusion profiles on the duration of high-strain deformation in thickened crust. Geology 2009;; 37 (8): 755–758. doi: https://doi.org/10.1130/G25753A.1 Download citation file: Ris (Zotero) Refmanager EasyBib Bookends Mendeley Papers EndNote RefWorks BibTex toolbar search Search Dropdown Menu toolbar search search input Search input auto suggest filter your search All ContentBy SocietyGeology Search Advanced Search Abstract Diffusion profiles in garnet are used to determine the duration of movement on shear zones. In the Musgrave Block, central Australia, Grenville age granulites were overprinted at depths of ~40 km by high-strain zones during the intracratonic Petermann orogeny (ca. 550 Ma ago). In these zones, quartzofeldspathic mylonites contain garnet from the early granulite facies event that developed compositional gradients during the high-pressure overprint. The diffusion of Ca into garnet is linked with the release of Ca in plagioclase (the only calcic mineral in the rock) during neocrystallization of sodic feldspar during high-strain deformation. Available diffusion data on garnet directly define the duration of high-strain deformation at eclogite facies. Our results indicate that the integrated time scales of movement in individual high-strain zones were short lived (between 0.07 Ma and 1.4 Ma), and that wide shear zones were active longer than narrow ones. In addition, we find that relict K-feldspar in one of the narrow eclogite facies shear zones yields a 40Ar-39Ar age that is partially reset, indicating that the thermal event was also short lived. These short time scales support the hypothesis that shear heating was the dominant source of heat for the eclogite facies overprint. You do not have access to this content, please speak to your institutional administrator if you feel you should have access.
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Imitation des enseignantsNi prévalence calibrée, ni vérité terrain. Validation humaine à venir. Apprise à partir de 10 348 étiquettes directes de Codex et de 10 348 étiquettes directes de Gemma. Le mode candidate est l'union des têtes enseignantes seuillées; le consensus est leur intersection. Ces sorties portent le statut machine_predicted_unvalidated et ne sont ni des étiquettes humaines ni des étiquettes directes de modèles de pointe.
Scores Codex et Gemma par catégorie
| Catégorie | Codex | Gemma |
|---|---|---|
| Métarecherche | 0,000 | 0,000 |
| Méta-épidémiologie (sens strict) | 0,000 | 0,000 |
| Méta-épidémiologie (sens large) | 0,000 | 0,000 |
| Bibliométrie | 0,000 | 0,000 |
| Études des sciences et des technologies | 0,000 | 0,000 |
| Communication savante | 0,000 | 0,000 |
| Science ouverte | 0,000 | 0,000 |
| Intégrité de la recherche | 0,000 | 0,000 |
| Charge utile insuffisante (le modèle a refusé de juger) | 0,008 | 0,000 |
Scores machine (provisoires)
Les deux têtes enseignantes du modèle étudiant, lues sur ce travail. Un score ordonne la base pour la relecture; il n'affirme jamais une catégorie, et le statut de validation accompagne chaque rangée tel quel.
Scores de référence d'un modèle non mature (critères de maturité non atteints, 7 itérations). Un score ordonne; il n'affirme jamais une catégorie.
score_only:v0-immature-baseline · tel quel depuis la passe de notation : score_only signifie que le nombre peut ordonner les travaux, et qu'aucune étiquette de catégorie n'en découleClassification
machine, non validéePrédiction automatique; un appel candidat d’une seule tête enseignante, pas un consensus.
Le détail, modèle par modèle et score par score, se trouve en fin de page sous « Comment cette classification a été obtenue ».