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Titanite Low-Temperature Alteration and Ti Mobility

Published online by Cambridge University Press:  01 January 2024

David B. Tilley  and
Richard A. Eggleton
David B. Tilley*
Affiliation:
Cooperative Research Centre for Landscape Evolution and Mineral Exploration, Department of Geology, Australian National University, Canberra, ACT 0200, Australia
Richard A. Eggleton*
Affiliation:
Cooperative Research Centre for Landscape Evolution and Mineral Exploration, Department of Geology, Australian National University, Canberra, ACT 0200, Australia
*
†Present address: PO Box 1605, Queanbeyan, NSW 2620, Australia
*E-mail address of corresponding author: [email protected]
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Abstract

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A pseudomorphous aggregate after titanite composed of smectite, anatase and residual titanite of composition (Ca0.98,Mn0.02)(Ti0.65,Al0.35)[SiO4](O0.65,OH0.35), from a depth of 450 m in the Broken Hill South Mine, New South Wales, Australia, was investigated by electron microscopy and microanalysis to characterize the alteration products and the mobility of Ti. Examination of the pseudomorph showed randomly oriented anatase crystals dispersed throughout a matrix of beidellite, with 9% porosity. Around the periphery and along the (110) cleavage plane of titanite, alteration was most developed. The range of Ti mobility was found to be limited to ~500 nm, and the ratio between the average diameter of anatase crystals and the average distance between them is ≈1.3. This ratio is consistent with an alteration process in which Ti is conserved and the anatase crystals grow from the Ti available immediately around them. It is unlikely that Ti migrated beyond the titanite pseudomorph.

Keywords

Aluminous TitaniteAnataseBeidelliteMontmorilloniteSmectiteSpheneTitanium Mobility
Type
Research Article
Information
Clays and Clay Minerals , Volume 53 , Issue 1 , February 2005 , pp. 100 - 107
Copyright
Copyright © Clay Minerals Society 2005

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