Y.Y. Xiao
Effects of decarbonation on elemental behaviors during subduction-zone metamorphism: Evidence from a titanite-rich contact between eclogite-facies marble and omphacitite
Xiao, Y.Y.; Niu, Yaoling; Zhang, H.F.; Wang, K.-L.; Iizuka, Y.; Lin, J.Y.; Tan, Y.L.; Xu, Y.J.
Authors
Yaoling Niu
H.F. Zhang
K.-L. Wang
Y. Iizuka
J.Y. Lin
Y.L. Tan
Y.J. Xu
Abstract
In this paper, we show the effects of subducted carbonates on geochemical processes during subduction-zone metamorphism (SZM) through the study of an eclogite-facies marble coexisting with metabasite from the ultrahigh pressure metamorphic belt of the Chinese Western Tianshan orogen. Between the marble and metabasite is a titanite-rich contact resulting from fluid-facilitated metamorphic reactions between the two lithologies, and recording elemental changes of geodynamic significance. Because this titanite-rich contact is dominated by titanite (an important host for high field strength elements, HFSEs) without white micas (an important host for large ion lithophile elements, LILEs), HFSEs are largely conserved in titanite whereas LILEs are moved away. This observation emphasizes the potential significance of subducting carbonate in retaining HFSEs in the slab through the formation and stabilization of titanite, contributing to the characteristic “arc signature” unique to subduction-zone magmatism (i.e., high LILEs, low HFSEs). The implicit assumption in this interpretation is that the observed lithological assemblage represents residues of subducting oceanic crust that has undergone major episodes of dehydration. Subducted carbonates also have significant implications for the origin of mantle isotopic heterogeneity as revealed from oceanic basalts.
Citation
Xiao, Y., Niu, Y., Zhang, H., Wang, K., Iizuka, Y., Lin, J., …Xu, Y. (2017). Effects of decarbonation on elemental behaviors during subduction-zone metamorphism: Evidence from a titanite-rich contact between eclogite-facies marble and omphacitite. Journal of Asian Earth Sciences, 135, 338-346. https://doi.org/10.1016/j.jseaes.2017.01.006
Journal Article Type | Article |
---|---|
Acceptance Date | Jan 11, 2017 |
Online Publication Date | Jan 12, 2017 |
Publication Date | Jan 12, 2017 |
Deposit Date | Feb 6, 2017 |
Publicly Available Date | Mar 29, 2024 |
Journal | Journal of Asian Earth Sciences |
Print ISSN | 1367-9120 |
Publisher | Elsevier |
Peer Reviewed | Peer Reviewed |
Volume | 135 |
Pages | 338-346 |
DOI | https://doi.org/10.1016/j.jseaes.2017.01.006 |
Files
Accepted Journal Article
(3.6 Mb)
PDF
Publisher Licence URL
http://creativecommons.org/licenses/by-nc-nd/4.0/
Copyright Statement
© 2017. This manuscript version is made available under the CC-BY-NC-ND 4.0 license http://creativecommons.org/licenses/by-nc-nd/4.0/
You might also like
Low-degree melt metasomatic origin of heavy Fe isotope enrichment in the MORB mantle
(2022)
Journal Article
Chemical variations of loess from the Chinese Loess Plateau and its implications
(2022)
Journal Article
Downloadable Citations
About Durham Research Online (DRO)
Administrator e-mail: dro.admin@durham.ac.uk
This application uses the following open-source libraries:
SheetJS Community Edition
Apache License Version 2.0 (http://www.apache.org/licenses/)
PDF.js
Apache License Version 2.0 (http://www.apache.org/licenses/)
Font Awesome
SIL OFL 1.1 (http://scripts.sil.org/OFL)
MIT License (http://opensource.org/licenses/mit-license.html)
CC BY 3.0 ( http://creativecommons.org/licenses/by/3.0/)
Powered by Worktribe © 2024
Advanced Search