Reverse age zonation of zircon formed by metamictisation and hydrothermal fluid leaching

Xu, Xi-Sheng and Zhang, Ming and Zhu, Kong-Yang and Chen, Xiao-Ming and He, Zhen-Yu (2012) Reverse age zonation of zircon formed by metamictisation and hydrothermal fluid leaching. Lithos, 150. pp. 256-267. ISSN 0024-4937 DOI 10.1016/j.lithos.2011.12.014

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Abstract

Understanding the stability of radiation-damaged zircon is crucial to the application of zircon to U-Pb geochronology, especially for zircons rich in radioactive nuclides. Electron microprobe and laser Raman spectral analyses show that zircons from the Ejinao sodalite syenite in Southeast China are composed of cores without zonation and oscillatory rims. The cores are rich in uranium and have experienced increased metamictisation. An internal sieved structure and radial cracks were formed by radiation damage and radiation-induced volume expansion. Infrared spectral analyses show that zircon from the Ejinao sodalite syenite contains large amounts of OH and H2O. This finding suggests that the zircon crystals experienced hydrothermal alteration.

Item Type: Article
Uncontrolled Keywords: 2011AREP; IA64;
Subjects: 03 - Mineral Sciences
Divisions: 03 - Mineral Sciences
Journal or Publication Title: Lithos
Volume: 150
Page Range: pp. 256-267
Identification Number: 10.1016/j.lithos.2011.12.014
Depositing User: Sarah Humbert
Date Deposited: 21 Jan 2012 14:33
Last Modified: 23 Jul 2013 10:03
URI: http://eprints.esc.cam.ac.uk/id/eprint/2342

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