Please use this identifier to cite or link to this item: http://hdl.handle.net/2440/127410
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Type: Journal article
Title: Rapid oxygen diffusion during high temperature alteration of zircon
Author: Roberts, N.
Yang, Q.-.Y.
Santosh, M.
Citation: Scientific Reports, 2018; 8(1):3661-1-3661-10
Publisher: Springer Nature
Issue Date: 2018
ISSN: 2045-2322
2045-2322
Statement of
Responsibility: 
Nick M.W. Roberts, Qiong-Yan Yang, M. Santosh
Abstract: The mineral zircon through its isotopic and elemental signatures comprises the greatest archive recording the evolution of Earth's continental crust. Recognising primary from secondary zircon compositional signatures is thus important for the accurate interpretation of this archive. We report two examples of metasedimentary rocks from high-grade shear zones within the Southern Granulite Belt of India, where anomalously high and homogeneous oxygen isotope signatures indicate disturbance of this isotopic system. Utilising the combined U-Pb-Hf-O and trace element signatures from these zircon grains, we postulate that fluid-assisted alteration has led to complete resetting of the oxygen isotope signatures. This case study presents a rarely observed natural example of potentially fast diffusion of oxygen under hydrous conditions. Given the pervasive nature of fluid interaction within high-grade and highly deformed rocks, we expect that such isotopic disturbance might be more common to nature than is currently reported. A lack of correlation between isotopic disturbance with cathodoluminescence or Th/U values, suggests that these altered zircon grains would not clearly be classified as metamorphic, in which case they would be expected to yield primary compositions. Caution is therefore advised when using detrital δ¹⁸O zircon compilations without a high level of scrutiny for primary versus secondary compositions.
Rights: © The Author(s) 2018. Open Access. This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.
RMID: 0030083139
DOI: 10.1038/s41598-018-22016-2
Appears in Collections:Geology & Geophysics publications

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