Garnet–monazite rare earth element relationships in sub-solidus metapelites: a case study from Bhutan
Posted on 2018-03-27 - 10:09
A key aim of modern metamorphic geochronology is to constrain precise and accurate rates and timescales of tectonic processes. One promising approach in amphibolite and granulite-facies rocks links the geochronological information recorded in zoned accessory phases such as monazite to the pressure–temperature information recorded in zoned major rock-forming minerals such as garnet. Both phases incorporate rare earth elements (REE) as they crystallize and their equilibrium partitioning behaviour potentially provides a useful way of linking time to temperature. We report REE data from sub-solidus amphibolite-facies metapelites from Bhutan, where overlapping ages, inclusion relationships and Gd/Lu ratios suggest that garnet and monazite co-crystallized. The garnet–monazite REE relationships in these samples show a steeper pattern across the heavy (H)REE than previously reported. The difference between our dataset and the previously reported data may be due to a temperature-dependence on the partition coefficients, disequilibrium in either dataset, differences in monazite chemistry or the presence or absence of a third phase that competed for the available REE during growth. We urge caution against using empirically-derived partition coefficients from natural samples as evidence for, or against, equilibrium of REE-bearing phases until monazite–garnet partitioning behaviour is better constrained.
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Warren, Clare J.; Greenwood, Lucy V.; Argles, Tom W.; Roberts, Nick M. W.; Parrish, Randall R.; Harris, Nigel B. W. (2018). Garnet–monazite rare earth element relationships in sub-solidus metapelites: a case study from Bhutan. Geological Society of London. Collection. https://doi.org/10.6084/m9.figshare.c.4044323.v1
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AUTHORS (6)
CW
Clare J. Warren
LG
Lucy V. Greenwood
TA
Tom W. Argles
NR
Nick M. W. Roberts
RP
Randall R. Parrish
NH
Nigel B. W. Harris
CATEGORIES
KEYWORDS
granulite-facies rocks linksinclusion relationshipsrock-forming mineralscase studysub-solidus metapelitesearth element relationshipsequilibrium partitioning behaviourmonazite co-crystallizedsub-solidus amphibolite-facies metapelitesREE-bearing phasessamples showpartition coefficientsaccessory phasesearth elementsgarnetdatasettectonic processesgeochronological informationreport REE datamonazite chemistryBhutanempirically-derived partition coefficientsGeology