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Extreme Zr stable isotope fractionation during magmatic fractional crystallization

Ibañez-Mejia, Mauricio and Tissot, François L. H. (2019) Extreme Zr stable isotope fractionation during magmatic fractional crystallization. Science Advances, 5 (12). Art. No. eaax8648. ISSN 2375-2548. PMCID PMC6920019. https://resolver.caltech.edu/CaltechAUTHORS:20200106-080043111

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Abstract

Zirconium is a commonly used elemental tracer of silicate differentiation, yet its stable isotope systematics remain poorly known. Accessory phases rich in Zr⁴⁺ such as zircon and baddeleyite may preserve a unique record of Zr isotope behavior in magmatic environments, acting both as potential drivers of isotopic fractionation and recorders of melt compositional evolution. To test this potential, we measured the stable Zr isotope composition of 70 single zircon and baddeleyite crystals from a well-characterized gabbroic igneous cumulate. We show that (i) closed-system magmatic crystallization can fractionate Zr stable isotopes at the >0.5% level, and (ii) zircon and baddeleyite are isotopically heavy relative to the melt from which they crystallize, thus driving chemically differentiated liquids toward isotopically light compositions. Because these effects are contrary to first-order expectations based on mineral-melt bonding environment differences, Zr stable isotope fractionation during zircon crystallization may not solely be a result of closed-system thermodynamic equilibrium.


Item Type:Article
Related URLs:
URLURL TypeDescription
https://doi.org/10.1126/sciadv.aax8648DOIArticle
https://advances.sciencemag.org/content/suppl/2019/12/16/5.12.eaax8648.DC1PublisherSupplementary Materials
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6920019PubMed CentralArticle
ORCID:
AuthorORCID
Ibañez-Mejia, Mauricio0000-0002-7839-2425
Tissot, François L. H.0000-0001-6622-2907
Additional Information:© 2019 The Authors, some rights reserved; exclusive licensee American Association for the Advancement of Science. No claim to original U.S. Government Works. Distributed under a Creative Commons Attribution NonCommercial License 4.0 (CC BY-NC). Submitted 30 April 2019; Accepted 4 November 2019; Published 18 December 2019. We thank D. McGee for access to the MIT Nu Plasma II and J. DesOrmeau for the scanning electron microscopy imaging at U. Nevada in Reno. We thank E. Bloch and M. Méheut for comments to an earlier version of the manuscript. G. Gaetani, H. Marshall, and three anonymous reviewers provided comments that greatly helped improve the manuscript. Funding: This research was supported by NSF-EAR grants 1823748 (to M.I.-M.) and 1824002 (to F.L.H.T.), and startup funds to M.I.-M. provided by U. Rochester. Author contributions: M.I.-M. and F.L.H.T. designed the study, developed all laboratory methods, performed the measurements, interpreted the results, and wrote the manuscript. The authors declare that they have no competing interests. Data and materials availability: All data needed to evaluate the conclusions in the paper are present in the paper and/or the Supplementary Materials. Aliquots from rock and mineral samples used in this study are stored at U. Rochester and available from M.I.-M. upon request.
Funders:
Funding AgencyGrant Number
NSFEAR-1823748
NSFEAR-1824002
University of RochesterUNSPECIFIED
Issue or Number:12
PubMed Central ID:PMC6920019
Record Number:CaltechAUTHORS:20200106-080043111
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20200106-080043111
Official Citation:M. Ibañez-Mejia, F. L. H. Tissot, Extreme Zr stable isotope fractionation during magmatic fractional crystallization. Sci. Adv. 5, eaax8648 (2019). doi: 10.1126/sciadv.aax8648
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:100521
Collection:CaltechAUTHORS
Deposited By: Tony Diaz
Deposited On:07 Jan 2020 19:43
Last Modified:07 Jan 2020 19:43

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