The role of randomly mixed-layered chlorite/smectite in the transformation of smectite to chlorite

Bettison-Varga, L. & Mackinnon, I.D.R. (1997) The role of randomly mixed-layered chlorite/smectite in the transformation of smectite to chlorite. Clays and Clay Minerals, 45(4), pp. 506-516.

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Abstract

Vesicular and groundmass phyllosilicates in a hydrothermally altered basalt from the Point Sal ophiolite, California, have been studied using transmission electron microscopy (TEM). Pore-filling phyllosilicates are texturally characterized as having coherent, relatively thick and defect-free crystals of chlorite (14 Å) with occasional 24-Å periodicities. Groundmass phyllosilicates are texturally characterized as 1) randomly oriented crystals up to 200 Å in width and 2) larger, more coherent crystals up to 1000 Å in width. Small crystallites contain predominantly 14-Å layers with some 24-Å units. Large crystals show randomly interlayered chlorite/smectite (C/S), with approximately 50% chlorite on average. Adjacent smectite-like layers are not uncommon in the groundmass phyllosilicates. Electron microprobe analyses show that Fe/Mg ratios of both groundmass and vesicular phyllosilicates are fairly constant. Termination of brucite-like interlayers has been identified in some of the TEM images. The transformation mechanisms represented by these layer terminations are 1) growth of a brucite-like interlayer within smectite interlayer regions and 2) the dissolution and reprecipitation of elements to form chlorite layers. Both mechanisms require an increase in volume as smectite transforms to chlorite. The data, combined with that from previously published reports, suggest that randomly interlayered C/S is a metastable phase formed in microenvironments with low water/rock ratios. Chlorite forms in microenvironments in the same sample dominated by higher water/rock ratios. The relatively constant number of Mg's in the structure (Mg#) of both structures indicates that in both microenvironments the bulk rock composition has influence over the composition of phyllosilicates.

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ID Code: 57465
Item Type: Journal Article
Refereed: Yes
Additional Information: Cited By (since 1996): 25
Export Date: 19 February 2013
Source: Scopus
CODEN: CLCMA
Language of Original Document: English
Correspondence Address: Bettison-Varga, L.; Department of Geology, College of Wooster, Wooster, OH 44691, United States
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Keywords: Chlorite, Corrensite, Hydrothermal Metamorphism, Random Interlayered Chlorite/Smectite, Smectite, Basalt, Crystal microstructure, Silicate minerals, Textures, TEM
DOI: 10.1346/CCMN.1997.0450403
ISSN: 0009-8604
Subjects: Australian and New Zealand Standard Research Classification > EARTH SCIENCES (040000) > GEOLOGY (040300) > Mineralogy and Crystallography (040306)
Divisions: Current > Institutes > Institute for Future Environments
Copyright Owner: Copyright 1997 The Clay Minerals Society
Copyright Statement: Reproduced with kind permission of The Clay Minerals Society, publisher of Clays and Clay Minerals
Deposited On: 27 Feb 2013 03:34
Last Modified: 12 Nov 2013 04:14

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