AMS of Křivoklát-Rokycany Complex, Barrandian

KOLÁŘOVÁ, Kristina, Jan ČERNÝ and Rostislav MELICHAR. AMS of Křivoklát-Rokycany Complex, Barrandian. In 13th Meeting of the Central European Tectonic Studies Group. 2015. ISBN 978-80-7075-880-9.

Basic information

• Original name: AMS of Křivoklát-Rokycany Complex, Barrandian
• Authors: KOLÁŘOVÁ, Kristina (203 Czech Republic, guarantor, belonging to the institution), Jan ČERNÝ (203 Czech Republic, belonging to the institution) and Rostislav MELICHAR (203 Czech Republic, belonging to the institution).
• Edition: 13th Meeting of the Central European Tectonic Studies Group. 2015.

Other information

• Original language: English
• Type of outcome: Conference abstract
• Field of Study: 10500 1.5. Earth and related environmental sciences
• Country of publisher: Czech Republic
• Confidentiality degree: is not subject to a state or trade secret
• WWW: Odkaz na PDF verzi sborníku
• RIV identification code: RIV/00216224:14310/15:00082847
• Organization unit: Faculty of Science
• ISBN: 978-80-7075-880-9
• Keywords in English: Anisotropy of magnetic susceptibility; AMS; Ryolite; Andesite; Volcanic rocks; Structural geology; Tectonics

Abstract

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.