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Green ferric clay in non-marine sandstones of the Rewan Group, southern Bowen Basin, Eastern Australia

Published online by Cambridge University Press:  09 July 2018

J. C. Baker*
Affiliation:
Centre for Microscopy and Microanalysis, The University of Queensland, Brisbane, Queensland, 4072, Australia, and K.R. Martin Pty. Ltd., P.O. Box 22, Kenmore, Queensland, 4069, Australia

Abstract

Accessory green ferric clay occurs in fluvial litharenites of the Early Triassic Rewan Group. Although resembling glauconitic minerals in thin-section, electron microprobe analyses indicate that the green ferric clay is mainly ferric illite. The ferric illite may have formed in a small hypersaline lake or well drained, flood-plain soil, and its presence in the Rewan Group cannot be used to support a notion that the unit is partly marine influenced. Identification of the ferric illite by electron microprobe analysis shows that some green ferric clays, particularly those that resemble glauconitic minerals optically, may require precise quantitative elemental analysis before they can be used as a basis for environmental interpretation. Green ferric clay in the Rewan Group also includes detrital celadonite that most likely originated in a volcanic arc setting.

Type
Research Article
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1997

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