Volcanics and volcanisedimentary rocks

The volcanics (extrusive or effusive magmatic rocks) resulted from volcanic action on or near the Earth´s surface, either as lava flows or as volcanic explosion (volcanic ash, lapilli, bombs). The products can be retransported to considerable distance. Volcanisedimentary rocks consist of a mixture of volcanic products and sediments. These two compouds can be mixed or deposited in alternating layers. Tuffite is a good example.

Exhibition detail no. 8073

No. of sample:	g8073
Rock:	keratofyr (alk.živc. trachyt - andezit), vulkanity (+ vulkanosedimentární horniny)
Description:	jeden kus
Localization:	Hřešihlavy, o. Rokycany, V obce, údolí k Rybárně, lůmek 100m Z

Author:	leg.Fiala, 1965
Comment:	proterozoikum - spilitový vulkanismus, Z před vyústěním cesty do údolí Radubice - bod č. 1081-b, výbrus 45726-I, analysa č. S98 /1090/65, 66,31% SiO2, 5,87%, Na2O, 3,28% K2O

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Virtual museum of the Czech Geological Survey, www.geology.cz, (C) Czech Geological Survey, 2011, v.0.99 [13.12.2011]