Monazite–xenotime Y and REE thermometry

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Table of contents

Chapitre 1 Overview of the Sveconorwegian orogeny and Mesoproterozoic
evolution of Rogaland, S-Norway
Résumé
Framework of Rodinia assembly
The Sveconorwegian orogeny
1280–1150 Ma time interval (pre-Sveconorwegian)
1150–1080 Ma time interval (Arendal phase)
1050–1030 Ma time interval (Agder phase)
1030–1000 Ma time interval (Agder phase)
990–970 Ma time interval (Falkenberg phase)
970–950 Ma time interval (Dalane phase)
950–920 Ma time interval (Dalane phase)
Tectono-magmatic evolution of Rogaland
Magmatism
Metamorphism
Chapitre 2 Sulphate incorporation in monazite lattice and dating the cycle of sulphur in metamorphic belts
Résumé
Abstract
Introduction
Monazite crystal chemistry
Geological background
Analytical methods
Monazite zoning and micro-chemistry
Monazite U–Th–Pb geochronology
Transmission electron microscopic (TEM) imaging
Results
Sample petrology
Monazite texture, composition and inclusions
Nano-characterization of monazite by TEM
U–Th–Pb geochronology
Discussion
Mechanism of S incorporation in monazite
Significance of S-rich monazite
Metasomatic replacement of S-rich monazite
Dating S mobility in metamorphic belts
Conclusion
Acknowledgement
References
Supplementary materials
Chapitre 3 Two cycles of ultra-high temperature metamorphism in Rogaland, S. Norway: critical evidence from monazite Y-thermometry & U–Pb geochronology
Résumé
Abstract
Introduction
Geological setting.
Methods
Micro-chemistry
U–Th–Pb geochronology
Mineral composition and phase equilibria modelling
Monazite–xenotime Y and REE thermometry
Microstructures, petrography and mineral compositions
Orthopyroxene zone
Osumilite zone
Pigeonite zone
Phase equilibria modelling and textural interpretation
Orthopyroxene zone
Osumilite zone
Pigeonite zone
Monazite–xenotime chemistry and monazite U–Th–Pb geochronology
Orthopyroxene zone
Osumilite zone
Pigeonite zone
Discussion
A monazite based temperature–time path
Two phases of UHT metamorphism
Conclusion
References
Supplementary material
Chapitre 4 The fate of zircon during polyphase granulite facies metamorphism in Rogaland, South Norway
Résumé
Abstract
Introduction
Geological setting.
Analytical methods
U–Th–Pb geochronology
Chemical micro-analyses
Scanning ion imaging
Samples background
Results
Zircon zoning and microchemistry
Zircon U–Pb geochronology
Comparing monazite and zircon age record through time and space
Zircon oxygen isotopes
Scanning ion Imaging
Discussion
Response of O isotopes
Processes of zircon U–Pb partial resetting
Insight from Pb distribution
Tracking melt-present conditions in slow granulite
Conclusion
References
Supplementary material
S4-2: Phase equilibria modelling for sample ALR 13-69
S4-3: Monazite chemistry and U–Th–Pb geochronology for sample ALR 13-69
Chapitre 5 Discussion of temperaturetime evolution of Rogaland and plausible heat sources for UHT metamorphism
Résumé
Abstract
Introduction
Models for UHT metamorphism
P–T–t–D paths of the Rogaland
Geometrical relationships
Significance of the Opx-isograd
Timing of deformation and vertical movement
Interplay between magmatism and metamorphism
Timescale of AMC emplacement
Synthetic T–t diagram deduced from metamorphic rocks
Interplay between magmatism and metamorphism
Radiogenic heat production of the crust
Whole rock geochemistry
Redistribution of U and Th
Geodynamic speculation and conclusion
References
Supplementary materials
Conclusion et perspectives
Apports à la compréhension du comportement de la monazite au cours du métamorphisme de UHT
Apports à la compréhension du comportement du zircon au cours du métamorphisme de UHT
L’évolution du Rogaland et causes du métamorphisme de UHT
La monazite : traceur des minéralisations ?
Perspectives
Références