Authigenic chlorites; problems with chemical analysis and structural formula calculations

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Authors:Curtis, C. D.; Ireland, B. J.; Whiteman, J. A.; Mulvaney, R.; Cobley, T.
Author Affiliations:Primary:
Univ. Sheffield, Dep. Geol., Sheffield, United Kingdom
Other:
Univ. London, Queen Mary Coll., Dep. Geol. Sci., United Kingdom
Volume Title:Patterns of mineral diagenesis on the NW European continental shelf and their relations to facies and hydrocarbon accumulation
Volume Authors:Morgan, D. J., editor; Rawson, P. F.
Source:Clay Minerals, 19(3), p.471-481; Joint meeting of the Clay Minerals Group of the Mineralogical Society and the Petroleum Exploration Society of Great Britain ; Patterns of mineral diagenesis on the NW European continental shelf and their relations to facies and hydrocarbon accumulation, Cambridge, United Kingdom, April 7-8, 1984, edited by D. J. Morgan and P. F. Rawson. Publisher: Mineralogical Society, London, United Kingdom. ISSN: 0009-8558
Publication Date:1984
Note:In English. 16 refs.; illus. incl. 5 tables
Summary:Analytical TEM was applied to some authigenic chlorites occurring as grain coatings in sandstones. Compositional variation proved to be relatively slight: all were magnesian chamosites. The coating chlorites were often intimately mixed with extremely fine-grained (0.01-0.2 mu m) hematite but analytical 'contamination' was avoided because of the very high resolution of both observation (spot location) and analysis. One example of a water-sensitive ("swelling chlorite') coating was also studied. This proved to have a very much more variable composition even within a single section. The coating appeared to include both chloritic and vermiculitic components. The effect of this on structural formulae is discussed and a model proposed in which the 'talc' layer may be common to both components. (Authors' abstract) [D.J.M.]
Subjects:Authigenesis; Authigenic minerals; Chemical analysis; Chemical composition; Chlorite; Chlorite group; Clastic rocks; Clay mineralogy; Composition; Diagenesis; Expansive materials; Grain size; Mineral data; Observations; Pore water; Porosity; Precipitation; Processes; Sandstone; Sedimentary rocks; Sheet silicates; Silicates; TEM data; X-ray data
Abstract Numbers:85M/1853
Record ID:1985033743
Copyright Information:GeoRef, Copyright 2019 American Geosciences Institute. Reference includes data from Mineralogical Abstracts, United Kingdom, Twickenham, United Kingdom
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