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. 8072

No. of sample:	g8072
Rock:	keratofyr (alk.živc. trachyt - andezit), vulkanity (+ vulkanosedimentární horniny)
Description:	jeden kus
Localization:	Hřešihlavy, o. Rokycany, V obce, údolí k Rybárně, 100m před údplím Radubice

Author:	leg.Fiala, 1965
Comment:	proterozoikum - spilitický vulkanismus, bod.č. 1081-a, výbrus 45725-I, Analysa č. 1089/65 - spil. S97, 61,40% SiO2, 3,05%Na2O, 6,24%K2O

back

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