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Electron Microscopic Investigation of FE-Rich Phyllosilicates

Published online by Cambridge University Press:  02 July 2020

Chi Ma ,
Richard A. Eggleton  and
George R. Rossman
Chi Ma
Affiliation:
Division of Geological and Planetary Sciences, California Institute of Technology, Pasadena, CA91125, USA
Richard A. Eggleton
Affiliation:
Department of Geology, Australian National University, Canberra, ACT 0200, Australia
George R. Rossman
Affiliation:
Division of Geological and Planetary Sciences, California Institute of Technology, Pasadena, CA91125, USA
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Abstract

Green glauconite-like minerals from Weipa, Australia, which were previously known as glauconite, were determined to be unusual Fe-rich vermicuhte and Fe-rich smectite. This study revealed the structural and chemical nature of these unique phyllosilicates with HRTEM, AEM, SEM and XRD analysis.

The Fe-rich phyllosilicates comprising up to about 15 wt% of the rock occur with various amounts of quartz, mica, feldspar, low-Fe smectite, kaolinite, pyrite and siderite at about 30 meters depth in unweathered marine sediments of the Rolling Downs Formation at Weipa. The proportions of Fe-rich vermiculite and smectite decrease upward and become undetectable in the upper saprolite zone at about 23 m depth.

Two major morphologies of the Fe-rich phyllosilicates were observed. One is of tabular or granular detrital-shaped form (Fig.la); the other is platy or film-like, coating grains and occurring in matrix and fissures (Fig.lb).

Type
Microscopy in the Real World: Natural Materials
Information
Microscopy and Microanalysis , Volume 7 , Issue S2: Proceedings: Microscopy & Microanalysis 2001, Microscopy Society of America 59th Annual Meeting, Microbeam Analysis Society 35th Annual Meeting, Long Beach, California August 5-9, 2001 , August 2001 , pp. 538 - 539
Copyright
Copyright © Microscopy Society of America 2001

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