Publication details

AMS of Křivoklát-Rokycany Complex, Barrandian



Year of publication 2015
Type Conference abstract
MU Faculty or unit

Faculty of Science

Description Cambrian volcanic rocks outcroops in Křivoklát-Rokycany volcanic complex, Barrandian area. A tectonic fault with the NE–SE orientation delimits the complex in the south. Main volcanic body is compound of younger rhyolite zone and older andesite–dacite one. Feeding structure is fulfilled by the Sýkořice Porphyr and it is situated in the NE. A lot of small volcanic centers in ryolitic part have been found. The position of centers does not corespond directly to the tectonic fault boundary complex of NE part. New findings indicate that each hill in ryolitic part in Křivoklát-Rokycany complex could be a small feeding center which stays non eroded due to vertical foliations in feeding centers which make the rock more resistent against weathering. It was possible to distinguish 3 types of volcanic rocks in the older andesitic part. It is hard to find any visible structures in the andesitic part. For that reason, the AMS studies were done and the inner magnetic fabric was possible to observe in the andesitic rocks. In few localities the magmatic foliation and even prolongation of bubbles were visible. That structures representing direction of magma flow were measured and correlated with magnetic lineation. The direction of magma flow was always parallel to the magnetic lineation. Therefore magnetic lineatio n (K1) can be considered as magma flow direction and magmatic foliation as magnetic foliation.

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