metabentonite

metabentonite

[¦med·ə′bent·ən‚īt]
(geology)
Altered bentonite, formed by compaction or metamorphism; it swells very little and lacks the usual high colloidal properties of bentonite.
References in periodicals archive ?
On the distribution of the main metabentonite stratum (d, XXII) in the Middle Ordovician of Baltoscandia.
Occurrence: In a metabentonite within a sequence of dark gray mudstones.
Metabentonite geochemistry: magmatic cycles and graptolite extinctions at Dob's Linn, southern Scotland.
In the Ohesaare drill core a metabentonite layer at a depth of 345.8 m has been treated as the boundary marker of the stratotype level between the Adavere and Jaani stages (Nestor 1997).
Metabentonite layers in the Estonian geological sections of Pirgu age refer to volcanism and tectonic activity in the west (Kiipli et al.
Using these correlations, Vingisaar (1972) published the first distribution and thickness map of the 'main metabentonite' layer across the entire Baltoscandian area.
The Kinnekulle K-bentonite (or metabentonite) is the thickest and most widely distributed altered volcanic ash bed in the Ordovician of Baltoscandia (Bergstrom et al.
Tsegelnyuk initiated a multidisciplinary revision of the sequence, including stratigraphy (especially lithostratigraphy), different groups of fossils, metabentonite beds for correlation purposes, etc.