期刊
CHEMICAL GEOLOGY
卷 439, 期 -, 页码 59-70出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.chemgeo.2016.06.014
关键词
Zircon; Partition coefficients; Rare earth elements; Trace elements; LA-ICP-MS
资金
- Society of Economic Geologists Hugo Dummett Mineral Discovery Fund
- National Science Foundation [EAR0309885]
- Arizona LaserChron Center [EAR1338583]
- Division Of Earth Sciences
- Directorate For Geosciences [1338583] Funding Source: National Science Foundation
Zircon/bulk rock REE partition coefficients from natural samples correlate with REE concentration in zircon. The correlation is the strongest for the LREE and diminishes with decreasing ionic radius. The relationship between partition coefficient and REE concentration in zircon can be modeled as a power law and the coefficient (alpha) and exponent (beta) terms for each of the REE are empirically determined using new and previously published data. A series of independent tests show that using variable partition coefficients based on the reported alpha and beta terms commonly results in more accurate estimates of bulk rock REE concentrations than average partition coefficients, particularly for the LREE that have previously been difficult to constrain. These results provide a way to account for highly variable REE concentrations in zircon, which may be controlled by numerous processes such as surface enrichment, complex substitution mechanisms, or accidental sampling of sub-microscopic inclusions. The proposed method for estimating bulk rock REE concentrations is especially well-suited to detrital zircon investigations where there is no information available on the parent rock composition. (C) 2016 Elsevier B.V. All rights reserved.
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