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Warren, Clare J.; Greenwood, Lucy V.; Argles, Tom W.; Roberts, Nick M. W.; Parrish, Randall R. and Harris, Nigel B. W.
(2019).
DOI: https://doi.org/10.1144/SP478.1
Abstract
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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- Item ORO ID
- 54600
- Item Type
- Journal Item
- ISSN
- 0305-8719
- Project Funding Details
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Funded Project Name Project ID Funding Body From Subduction to sand: Quantifying the balance between tectonic and surface processes during early continental collision and UHP rock exhumation. (SE-09-133-CW) NE/H016279/1 NERC (Natural Environment Research Council) Studentship: Resolving conflicting models for the tectonic assembly of the Eastern Himalaya (SE-08-183-NH) 2K09E017/BUFI S168 Geological Society Not Set IP-1177-0510 NERC (Natural Environment Research Council) - Academic Unit or School
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Faculty of Science, Technology, Engineering and Mathematics (STEM) > Environment, Earth and Ecosystem Sciences
Faculty of Science, Technology, Engineering and Mathematics (STEM) - Copyright Holders
- © 2018 The Author(s)
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