Electron microprobe dating of monazite

electron microprobe dating of monazite

How to determine the age of crystallization in monazite?

The robust Th-U-Pb system of monazite ( Parrish, 1990, Cherniak and Pyle, 2008) allows a precise determination of crystallization ages by means of chemical dating with the electron microprobe in thin sections ( Suzuki et al., 1991, Montel et al., 1996, Suzuki and Kato, 2008 ).

Can monazite withstand the Th-U-total Pb system?

This work highlights the withstand of monazite and its Th-U-total Pb system to sedimentary processes which makes this mineral an indispensable tool for provenance studies and source of Rare Earth Element (REEs) recovery.

Why do sedimentary monazite relics deliver a wide range of Ages?

However, a crucial outcome of this dating campaign is that sedimentary monazite relics often deliver a wide range of unrealistic ages because they are thinned out and/or show poor surfaces with numerous cracks and irregular edges.

How can we identify compositional domains in monazite?

Maps of elemental Y, Th, Pb, U have proven useful in identifying compositional domains in monazite. Estimated ages are calculated across the compositional map by analysing the concentration of Th, Pb and U by the total-Pb dating method. The result is then used to generate an age map which approximately identifies all the age domains.

Why study Diagenetic monazite?

Studying diagenetic monazite provides a good method to study the age, geochemical and thermal evolution of sedimentary basins, in particular those in the Precambrian with little fossil age controls. U-Th-Pb data and monazite ages can be used as a valuable tool for prospecting.

How do we determine the time of partial melting of monazite?

However, the ages of last prograde growth rim (lowest Y) and the first post-anatectic growth rim (highest Y) usually bracket the time of partial melting. Another scenario involves the formation or breakdown of garnet, influencing the Y and HREE ( heavy rare earth elements) content in the environment, thus the content of growing monazite.

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