Chemical disaggregation of kaolinitic claystones (tonsteins and flint clays)

The coarse non-clay fraction of many flint-like kaolinitic claystones often contains mineral grains diagnostic of the claystone's origin and, in the case of tonsteins (altered volcanic ashes), may also provide minerals suitable for radiometric dating. Separation of the non-clay mineral fraction...

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Bibliographic Details
Published in:	Clays and clay minerals Vol. 50; no. 6; pp. 766 - 770
Main Authors:	Triplehorn, Don M, Bohor, Bruce F, Betterton, William J
Format:	Journal Article
Language:	English
Published:	Boulder, CO Clay Minerals Society 01-12-2002 The Clay Minerals Society
Subjects:	chemical dispersion chemically precipitated rocks clastic rocks clay mineralogy clay minerals claystone dimethyl sulfoxide Disaggregation Dmso Earth sciences Earth, ocean, space Exact sciences and technology flint Flint Clay geochemistry Hydrazine Monohydrate kaolinite Kaolinitic Claystone mineral composition Mineralogy Petrology of sedimentary rocks except quaternary rocks sed rocks, sediments Sedimentary petrology Sedimentary rocks sheet silicates Silicates Tonstein volcanic ash kaolinite Flint Clay. Hydrazine Monohydrate tonstein sedimentary rocks claystone separation Disaggregation. DMSO flint clay sheet silicates silicates alteration clay minerals dating Kaolinitic Claystone clastic rocks
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Summary:	The coarse non-clay fraction of many flint-like kaolinitic claystones often contains mineral grains diagnostic of the claystone's origin and, in the case of tonsteins (altered volcanic ashes), may also provide minerals suitable for radiometric dating. Separation of the non-clay mineral fraction is often difficult because flint clays and flint-like clays resist slaking in water and thus are difficult to disaggregate. Chemical disaggregation of resistant kaolinitic claystones may be achieved by immersion in either hydrazine monohydrate or DMSO for periods ranging from one day to several weeks. Generally, hydrazine monohydrate works more quickly and efficiently than DMSO to disaggregate most kaolinitic claystones and flint clays.
Bibliography:	0009-8604(20021201)50:6L.766;1- (QE) Geology
ISSN:	0009-8604 1552-8367
DOI:	10.1346/000986002762090164