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- Monazite geochronology is a dating technique to study geological history using the mineral monazite. It is a powerful tool in studying the complex history of metamorphic rocks particularly, as well as igneous, sedimentary and hydrothermal rocks. The dating uses the radioactive processes in monazite as a clock. The uniqueness of monazite geochronology comes from the high thermal resistance of monazite, which allows age information to be retained during the geological history. As monazite grows, it forms successive generations of different compositions and ages, commonly without erasing the previous ones, forming zonation patterns in monazite. Because of the age zonation, dating should be done on individual zones, rather than the whole crystal. Also, textures of monazite crystals may represent certain type of events. Therefore, direct sampling techniques with high spatial resolution are required, in order to study these tiny zones individually, without damaging the textures and zonations. The advantage of monazite geochronology is the ability to relate monazite compositions with geological processes. Finding the ages of compositional zones can mean finding the ages of geological processes. (en)
- A geocronologia monazita é uma técnica de datação para estudar a história geológica usando o mineral monazita. É uma ferramenta poderosa no estudo da história complexa das rochas metamórficas, particularmente, bem como das rochas ígneas, sedimentares e hidrotérmicas. A datação usa os processos radioativos em monazita como um relógio. A singularidade da geocronologia de monazita vem da alta resistência térmica da monazita, que permite que as informações sobre a idade sejam retidas durante a história geológica. A vantagem da geocronologia de monazita é a capacidade de relacionar composições de monazita com processos geológicos. Encontrar as idades das zonas de composição pode significar encontrar as idades dos processos geológicos. (pt)
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- Quantitative dating: Histogram of ages measured, showing two age zonations in monazite. Edited after Williams, 1999. (en)
- A simplified diagram showing generations of monazite inclusions in different porphyroblasts and matrix. (en)
- Monazite identification: Illustration showing a backscattered electron image of a rock sample with monazite . Edited after Williams, 1999. (en)
- Sample preparation: Thin sections of limestone rocks (en)
- Core-rim zoning: altered rim formed surrounding the original core under a dissolution-precipitation reaction (en)
- Compositional mapping: Illustration showing X-ray Th composition map of a monazite grain. Brighter color represents higher concentration. Edited after Williams, 1999. (en)
- Illustration of an age map of a monazite grain. Brighter color corresponds to older age. Edited after Williams, 1999. (en)
- Concentric zoning: monazite grows with new successive layers with different compositions (en)
- Sector zoning: different elements crystallised preferentially at different faces of the crystal (en)
- P-T path associated with generation of monazite inclusion-bearing porphyroblast and matrix (en)
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- Successive growth of monazite grain by fluid-assisted dissolution-precipitation. ' Monazite dissolves along reaction front the contact with the fluid ' Monazite reprecipitates as an altered monazite with a new chemical composition ' Reaction continues with fluid being transported to the reaction front by infiltration paths. ' Reaction ceased due to recrystallisation of precipitating phase . Reaction ceased due to change in reaction system . (en)
- Zoning patterns of monazite. Intensity of colour represents the concentration of a certain element. Edited after Williams, 2007 (en)
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- Ceased due to change in reaction system.png (en)
- Fluid-assisted dissolution-precipitation.gif (en)
- Monazite Bse.jpg (en)
- Monazite age.jpg (en)
- Monazite concentric zoning.png (en)
- Monazite core-rim zoning.png (en)
- Monazite inclusion in porphyroblasts.gif (en)
- Monazite inclusions.png (en)
- Monazite quantitative analysis.jpg (en)
- Monazite sector zoning.png (en)
- Thin_sections.JPG (en)
- X-ray map of Th in monazite.jpg (en)
- Ceased due to recrystallisation of precipitating phase.png (en)
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- Monazite geochronology is a dating technique to study geological history using the mineral monazite. It is a powerful tool in studying the complex history of metamorphic rocks particularly, as well as igneous, sedimentary and hydrothermal rocks. The dating uses the radioactive processes in monazite as a clock. The advantage of monazite geochronology is the ability to relate monazite compositions with geological processes. Finding the ages of compositional zones can mean finding the ages of geological processes. (en)
- A geocronologia monazita é uma técnica de datação para estudar a história geológica usando o mineral monazita. É uma ferramenta poderosa no estudo da história complexa das rochas metamórficas, particularmente, bem como das rochas ígneas, sedimentares e hidrotérmicas. A datação usa os processos radioativos em monazita como um relógio. (pt)
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- Monazite geochronology (en)
- Geocronologia monazita (pt)
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