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Low-temperature hydrothermal alteration of natural metamict zircons from the Eastern Desert, Egypt

Published online by Cambridge University Press:  05 July 2018

T. Geisler ,
A. A. Rashwan ,
M. K. W. Rahn ,
U. Poller ,
H. Zwingmann ,
R. T. Pidgeon ,
H. Schleicher  and
F. Tomaschek
T. Geisler*
Affiliation:
Institut ftir Mineralogie, Universitiit Miinster, Corrensstr. 24, D - 48149 Miinster, Germany
A. A. Rashwan
Affiliation:
Faculty of Science – Banha, Geological Department, Zigazig University, Banha, Egypt
M. K. W. Rahn
Affiliation:
HSK, 5232 Villigen - HSK, Switzerland
U. Poller
Affiliation:
Max-Planck – Institut ftir Chemie, Abt. Geochemie, Postfach 3060, D-55020 Mainz, Germany
H. Zwingmann
Affiliation:
School of Applied Geology, Curtin University of Technology, GPO Box U 1987, Perth 6845, WA, Australia
R. T. Pidgeon
Affiliation:
School of Applied Geology, Curtin University of Technology, GPO Box U 1987, Perth 6845, WA, Australia
H. Schleicher
Affiliation:
Mineralogisch-Petrographisches Institut, Universitat Hamburg, Grindelallee 48, D - 20146 Hamburg, Germany
F. Tomaschek
Affiliation:
Institut ftir Mineralogie, Universitiit Miinster, Corrensstr. 24, D - 48149 Miinster, Germany
*
* E-mail: [email protected]
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Abstract

The chemical and structural alteration of metamict zircon crystals from a 619 ±17 (2σ) Ma old, posttectonic granite in the southern part of the Eastern Desert, Egypt was studied. The crystals show simple oscillatory growth zones with metamictization–induced fractures, which provided pathways for fluid infiltration. Electron and ion microprobe analyses reveal that metamict, i.e. U and Th–rich, areas are heavily enriched in Ca, Al, Fe, Mn, LREE, and a water species, and have lost Zr and Si as well as radiogenic Pb. These chemical changes are the result of an intensive reaction with a low–temperature (120—200°C) aqueous solution. The chemical reactions probably occurred within the amorphous regions of the metamict network. During the zircon–fluid interactions the metamict structure was partially recovered, as demonstrated by micro-Raman and -infrared measurements. A threshold degree of metamictization, as defined empirically by an α–decay dose, Dc, was necessary for zircons to undergo hydrothermal alteration. It is proposed that Dc marks the first percolation point, where the amorphous domains start to form percolating clusters in the metamict network and where bulk chemical diffusion is believed to increase dramatically. The time of the hydrothermal alteration is determined by a lower intercept age of a U-Pb SHRIMP discordia of 17.9 (2σ) Ma, which is in good agreement with an apatite fission track age of 22.2 (2σ) Ma. The hydrothermal alteration event occurred contemporaneously with the main rifting phase of the Red Sea and widespread low- temperature mineralizations along the Red Sea coast.

Keywords

hydrothermal alterationzirconEastern DesertEgyptmetamictizationRamaninfrared.
Type
Research Article
Information
Mineralogical Magazine , Volume 67 , Issue 3 , June 2003 , pp. 485 - 508
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 2003

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