1986
DOI: 10.1346/ccmn.1986.0340305
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Textural Variation and Composition of Bentonite Derived from Basaltic Ash

Abstract: Abstract--The Rokle bentonite deposit is part of an accumulation of argillized volcanoclastic rocks in the Tertiary stratovolcanic complex of the Doupovsk6 Mountains east of Karlovy Vary (Carlsbad), about 100 km westnorthwest of Prague, Czechoslovakia. The arenite basalt ash was originally composed of hyaloclasts and subordinate biotite. The following types of montmorillonite aggregates were produced during the alteration of the ash in a stagnant, lacustrine environment: (1) extremely fine-grained microcrystal… Show more

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Cited by 22 publications
(13 citation statements)
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“…Smectite crystals are present in the form of wavy flakes, forming characteristic honeycomb textures, which might be due to dehydration of the specimens in vacuum ( Figure 6). No systematic relationship between the smectite morphology and the location of the flakes was observed, contrary to the findings of Konta (1985). The smectite flakes have been formed via two ways: a) at the expense of volcanic glass, which in places, has led to pseudomorphic replacement textures ( Figure 6), (Khoury and Eberl 1979), and b) replacement of igneous feldspars, mainly plagioclases ( Figure 6), which also has led to pseudomorphic textures ( Figure 7).…”
Section: Morphology and Mineral Chemistrymentioning
confidence: 73%
“…Smectite crystals are present in the form of wavy flakes, forming characteristic honeycomb textures, which might be due to dehydration of the specimens in vacuum ( Figure 6). No systematic relationship between the smectite morphology and the location of the flakes was observed, contrary to the findings of Konta (1985). The smectite flakes have been formed via two ways: a) at the expense of volcanic glass, which in places, has led to pseudomorphic replacement textures ( Figure 6), (Khoury and Eberl 1979), and b) replacement of igneous feldspars, mainly plagioclases ( Figure 6), which also has led to pseudomorphic textures ( Figure 7).…”
Section: Morphology and Mineral Chemistrymentioning
confidence: 73%
“…%. The low K20 content in the bentonites attests to the low mobility of K. The high mobility of Ca and Mg in the aqueous environment contributes to a rapid attainment of chemical homogeneity between the hyaloclasts and free pores (Konta, 1986). The Ca/Na ratio of montmorillonite systematically decreases from the inner part of the alteration zone (Type-M1 montmorillonite) to the outer zone (Type-M2).…”
Section: Clays and Clay Mineralsmentioning
confidence: 99%
“…Minute fragments of sodium-rich plagioclase, potassium feldspar, quartz, and muscovite are ubiquitous accessories of the original hyaloclasts. Together with kaolinite, they formed from the underlying fresh or kaolinized orthogneiss (Konta 1986;Hradil et al 2004).…”
Section: Methodsmentioning
confidence: 99%