Fluid-rock interaction in orogenic crust tracked by zircon depth profiling
Notice bibliographique
Résumé
Research Article| August 01, 2009 Fluid-rock interaction in orogenic crust tracked by zircon depth profiling S.M. Gordon; S.M. Gordon 1Department of Geology and Geophysics, University of Minnesota, Minneapolis, Minnesota 55455, USA *Current address: Department of Earth Science, University of California–Santa Barbara, Santa Barbara, California 93106, USA Search for other works by this author on: GSW Google Scholar M. Grove; M. Grove 2Department of Geological and Environmental Sciences, Stanford University, Stanford, California 94305, USA Search for other works by this author on: GSW Google Scholar D.L. Whitney; D.L. Whitney 1Department of Geology and Geophysics, University of Minnesota, Minneapolis, Minnesota 55455, USA Search for other works by this author on: GSW Google Scholar A.K. Schmitt; A.K. Schmitt 3Department of Earth and Space Sciences, University of California–Los Angeles, Los Angeles, California 90095, USA Search for other works by this author on: GSW Google Scholar C. Teyssier C. Teyssier 1Department of Geology and Geophysics, University of Minnesota, Minneapolis, Minnesota 55455, USA Search for other works by this author on: GSW Google Scholar Geology (2009) 37 (8): 735–738. https://doi.org/10.1130/G25597A.1 Article history received: 23 Oct 2008 rev-recd: 12 Mar 2009 accepted: 30 Mar 2009 first online: 03 Mar 2017 Cite View This Citation Add to Citation Manager Share Icon Share MailTo Twitter LinkedIn Tools Icon Tools Get Permissions Search Site Citation S.M. Gordon, M. Grove, D.L. Whitney, A.K. Schmitt, C. Teyssier; Fluid-rock interaction in orogenic crust tracked by zircon depth profiling. Geology 2009;; 37 (8): 735–738. doi: https://doi.org/10.1130/G25597A.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 Ion microprobe U-Pb, δ18O, and Ti depth profiling analyses of natural zircon rims permit unprecedented assessment of the relationship between timing, temperature, and geochemical environment during crystallization and cooling of deep orogenic crust. Zircon from migmatite in a deeply exhumed gneiss dome in the Valhalla metamorphic core complex, southeast British Columbia, Canada, records the timing of melt crystallization and subsequent fluid-rock interaction before the final stages of extension and exhumation. Zircon interiors reveal a weighted mean age of 58 ± 2 Ma, interpreted as the timing of melt crystallization. Depth profiling U-Pb measurements of unpolished zircon rims yield an age of 51 ± 2 Ma over 4 μm. Ti-in-zircon thermometry indicates 650 °C for both rim and interior, confirming that the complex remained at high temperature during zircon crystallization. Previous δ18O measurements suggest that high-temperature fluids with δ18O of ~10‰ pervasively infiltrated the complex. The oxygen zircon results clearly resolve a δ18O contrast between zircon interiors (7.2 ± 0.2‰) and rims (8.4 ± 0.2‰). The lighter interior δ18O values indicate the timing of melt crystallization and equilibration of the rims with melt at 58 Ma ago. Alternatively, δ18O values from the 51 Ma rims match the composition predicted (8.4‰) from fluid interaction based upon previous work. Integrating the age and δ18O results reveals that amphibolite facies fluid-rock interaction persisted until final rapid exhumation of the Valhalla complex. The results further indicate the power of using the ion microprobe to track the timing of fluid infiltration in the crust as well as the effect of fluid infiltration on the subgrain scale. 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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Comment cette classification a été obtenuedéplier
Prédiction distillée sur la base complète
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 | 0,001 |
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 ».