Adjustment of Clays to Chemical Change and the Concept of the Equivalence Level

Cambridge University Press (CUP) - Tập 6 - Trang 309-326 - 1957
Maurice C. Powers1
1Shell Oil Company, Houston, USA

Tóm tắt

AbstractFurther x-ray and chemical work on suspended sediment samples and cored samples from the James River and its estuary support earlier proposals by the author. A chlorite-like clay is forming from weathered illite through a mixed-layer illite—vermiculite-chlorite stage, and some illite is seemingly regenerated to a better illite by potassium fixation.Chemical analyses of interstitial water, hydrochloric acid-leachate, and fused samples offer explanations regarding the chemical changes occurring in clays as composition of the environment changes.Magnesium is adsorbed by clays to a far greater degree than potassium in the marine and brackish environment.The variance between clays found in Recent and ancient sediments is related to and explained by the concept of the equivalence level. It is suggested that K+ is adsorbed preferentially to Mg2+ by clays when they have been buried to a depth that is greater than that of the Mg2+ — K+ — equivalence level; above this level Mg2+ is preferentially adsorbed by the clays.The trifold nature of clay minerals in terms of their origin and distribution is briefly discussed.

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Tài liệu tham khảo

Bradley, 1955, Clays and Clay Minerals, 395, 94

Murray, 1955, Clays and Clay Minerals, 395, 430

Powers, 1954, Clays and Clay Minerals, 327, 68

Foster, 1954, Clays and Clay Minerals, 327, 386

Grim, 1945, Some clay-water properties of certain clay minerals, J. Amer. Geram. Soc., 28, 90

Foster, 1951, The importance of exchangeable magnesium and cation-exchange capacity in the study of montmorillonitic clays, Amer. Minerol., 36, 717

Grim, 1942, Differential thermal analysis of clay minerals and other hydrous materials. Part 2, Amer. Mineral., 27, 801

Foster, 1955, Clays and Clay Minerals, 395, 205

Hofmann, 1939, Die Abhängigkeit des Kationenaustausches und der Quellung bei Montmorillonit von der Vorerhitzung, Ver. deut. Chemiker Beihefte, 35, 10

Wiegner, 1935, Ionenumtausch und Struktur, Trans. Third International Congress Soil Sci., 1, 5

Wiklander, 1955, Chemistry of the Soil, 107

10.1021/ja01863a037

Grim, 1954, Clays and Clay Minerals, 327, 81

Foster, 1953, Geochemical studies of olay minerals: II—Relation “between ionic substitution and swelling in montmorillonites, Amer. Minerei., 38, 994

Ross, 1945, Minerals of the montmorillonite group: their origin, and relation to soils and clays, U.S. Geol. Survey, 23

Kelley, 1948, Cation Exchange in Soils, 144

10.1007/BF01428524

Mitchell, 1955, Chemistry of the Soil, 253

Whitehouse, 1955, Clays and Clay Minerals, 395, 260

Chilingar, 1957, Evolution of chemical composition of clays of the Russian platform: by A. P. Vinogradov and A. B. Ronov, Geokhimi ja, reviewed in Geochim. Cosmochim. Acta, 12, 172

White, 1955, Clays and Clay Minerals, 395, 186

Grim, 1953, Clay Mineralogy, 384

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Thông tin xuất bản

Cambridge University Press (CUP)

Tập 6

309-326

Thông tin tác giả