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Monazite geochronology (EPMA)




These arrests are usually accepted to represent ingredients datibg electoral history during monazite remuneration or recrystallisation. Ernie Monazit Discuss in an Elf Positive. Economic-state cabinet of Pb is the net new of Pb in the nearby mineral with the developmental convenience, which is more a fluid.


It is easy to imagine diffusion in liquid ilfe as ink spreading in water. Solid-state diffusion of Pb is the net exchange of Pb in the solid mineral with the external environment, which is usually a fluid.

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Micropprobe most Monnazite the cases, Pb is transported from the mineral to the fluid, resulting in Pb loss miicroprobe thus age resetting. However, as the mineral cools and the crystal structure becomes more complete, the diffusions of parent and daughter nicroprobe slows down and finally become insignificant at a certain temperature. Once daging temperature falls below Tc, the system is closed and the clock starts counting. Mifroprobe Reaction ceased due to recrystallisation of precipitating phase dark orange. B Reaction ceased due to change in reaction system blue. Unlike solid-state diffusion, fluid-assisted dissolution-precipitation occurs below Tc.

Interaction between mineral phase and coexisting fluid phase during geological events directly contributes to this Mohazite. It is a chemical reaction driven by the system stabilisation from minimising Gibbs free datinng. If a geological process gives a suitable fluid and temperature, monazite dissolves along the contact with the fluid reaction frontand reprecipitates as an altered monazite with a new chemical composition. The rates of the dissolution and reprecipitation are the same, so that the original mineral phase is always in contact with the precipitating phase, separated by only a thin layer of fluid as a reaction medium.

The reaction front migrates towards the centre of the parent monazite, leaving behind the newly formed monazite, forming a core-rim structure. The composition of the precipitating phase depends on the fluid composition and temperature. During most of the reactions, Pb is efficiently removed and the precipitating phase is Pb-free. There are basically two factors causing the reaction to cease. A Reaction ceases due to the recrystallisation of precipitating phase, removing all the fluid infiltration paths. This results in fluid inclusion in monazite. B Reaction ceases due to change in system such as composition of fluid and monazite, making this reaction no longer reactive.

Yet as reaction proceeds, dissolving phase and the fluid are separated by the solid precipitating phase, blocking the transport of reactants. Therefore, there must be some inter-connected porosity in the precipitating phase, which allows the fluid to infiltrate and fuel the reaction front. Once they are subject to a temperature higher than Tc, all age information will be reset, losing information of the past geological events. In contrast, since monazite has a high Tc, even it experiences younger high-grade metamorphism with high temperatures, it is likely that the previous geological history is preserved.

Furthermore, dissolution-precipitation is usually triggered by geological events such as metamorphismdeformation and hydrothermal alternation below Tc.

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