Z. Dolníček, Jana Ulmanová, K. Malý, Jaroslav Havlíček, J. Sejkora
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引用次数: 1
Abstract
One xenolith of a contactly metamorphosed feldspar-hydroxyapophyllite hornfels from basaltic volcanite of the active quarry in Těchlovice village near-by the town of Děčín has been investigated. Its main components are represented by K-feldspar and hydroxyapophyllite-(K), which was hitherto reported from a single locality only in the territory of the Czech Republic. It forms grains up to 2 mm in size tightly associated with K-feldspar and subsidiary quartz, pyroxene (aegirine, enstatite-ferrosilite and diopside) and titanite. The unit cell parameters of hydroxyapophyllite-(K), derived from the powder X-ray data, are a = 8.975(4), c = 15.8371(3) Å and V = 1275.6(5) Å3. Chemical analyses correspond to the empirical formula K0.93Ca3.75Si7.87O20(OH0.96F0.04)·8 H2O. The xenolith originated by a comparatively weak contact metamorphic effect of the basaltic magma to a marly sediment under high partial pressure of H2O. Among xenoliths of North Bohemian Cainozoic volcanites the rock represents a rarity, which has not been known hitherto.
期刊介绍：
Bulletin Mineralogie Petrologie is a peer-reviewed journal focused especially on: mineralogy, crystal chemistry and study of crystal structures of minerals study of mineral associations and processes of their origin meteoritics, research of tectites economic geology (of ore deposits) and study of history of mining of ore deposits topographic mineralogy petrology of igneous, metamorphic and sedimentary rocks instrumental analytical methods at mineralogy and petrology mineralogy and petrology as tools for archeology and similar disciplines
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