Dear Megan,

we published a paper dealing with fluid-induced breakdown of monazite.

We found two generations of monazite: U-Th-bearing monazite (MnzI) formed at 575 °C and U-Th-poor monazite (MnzII) crystallized at 475-520 °C. Temperature constraints are from thermodynamic modelling.

 

Hope it could help you.

 

All the best

Deborah

 

 

Deborah Lo Pò, PhD

PostDoc
Dipartimento di Scienze Biologiche, Geologiche e Ambientali
UNIVERSITÀ DI BOLOGNA
Piazza di Porta San Donato 1, 40126, Bologna (Italy)

+39 051 2094930

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https://www.unibo.it/sitoweb/deborah.lopo

 

 

 

 

 

Dear All,

 

I am putting together a database of monazite chemistry from the published literature and am looking for datasets with the following essential characteristics:

1. Natural metamorphic monazite analyses (EPMA)
2. Analyses containing Th, Si and Ca
3. Each analysis paired to either a grain temperature (e.g. Y-in-monazite), or a whole rock temperature (conventional thermobarometry or phase diagrams). This can also be a temperature that is extrapolated from other samples in a terrane.

The following additional pieces of information would be useful, but are not essential:

4. Pressure conditions (grain or whole rock)
5. Whole rock composition for the sample, in particular including P, Ca, Al, Ce, Th, Y
6. The microstructural location of the grains.

I would highly appreciate any contributions of datasets that fit the above criteria, or direction to where published versions of the full datasets can be found. I have a particular paucity of data from low temperature (<550 °C) and high temperature (>850 °C).

 

Many thanks in advance,

 

Best regards,

 

Megan Williams

 

PhD Candidate

Impact of melt loss on monazite and Th behaviour in Earth’s crust: applications to geochronology and crustal heat production

Department of Earth Sciences

School of Physical Sciences

The University of Adelaide, AUSTRALIA 5005

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