The mechanism of flow and fabric development in mechanically anisotropic trachyte lava

0330476 - GFÚ 2010 RIV GB eng J - Journal Article
Závada, Prokop - Schulmann, K. - Lexa, O. - Hrouda, F. - Haloda, J. - Týcová, P.
The mechanism of flow and fabric development in mechanically anisotropic trachyte lava.
Journal of Structural Geology. Roč. 31, č. 11 (2009), s. 1295-1307. ISSN 0191-8141. E-ISSN 1873-1201
R&D Projects: GA AV ČR KJB301110703
Grant - others:GA ČR(CZ) GA205/03/0204
Institutional research plan: CEZ:AV0Z30120515
Keywords : trachyte * anisotropy of magnetic susceptibility * fibre-slip mechanism * lava dome * mechanical anisotropy * sanidine
Subject RIV: DB - Geology ; Mineralogy
Impact factor: 1.732, year: 2009

Anisotropy of magnetic susceptibility (AMS) and Electron back-scattered diffraction (EBSD) of magnetite and sanidine fabrics throughout an eroded trachyte lava dome in Tertiary volcanic province of the NW Czech Republic revealed two fabric types. The high degree of AMS fabric is associated with sanidine textural domains similar to normal kink bands and occupies the whole body except the SW margin. Folded fabric and low anisotropy of AMS also in the SW margin reveals sanidine alignment domains resembling reverse kink-bands. The flow of trachyte lava occurred via simultaneous slip of sanidine crystal along their planes and also by readjustment of the textural domain boundaries according to the fibre-slip theory.
Permanent Link: http://hdl.handle.net/11104/0176259