HR: 1340h
AN: MR23B-1329    [Abstracts]
TI: Quantification of Flow Structures in Syntectonic Magmatic Rocks
AU: * Kruhl, J H
EM: kruhl@tum.de
AF: Tectonics and Material Fabrics Section, Technische Universitaet Muenchen, Arcisstr. 21, Muenchen, 80333, Germany
AU: Gerik, A
EM: axel.gerik@mytum.de
AF: Tectonics and Material Fabrics Section, Technische Universitaet Muenchen, Arcisstr. 21, Muenchen, 80333, Germany
AB: Fabrics of syntectonic magmatic rocks provide important information on melt emplacement and crystallization conditions and, consequently, information on state and development of certain parts of the continental crust. Therefore, detailed studies on magmatic fabrics and, specifically, their quantification is a necessary prerequisite for any more detailed study. Fabric anisotropy and heterogeneity are fundamental properties of magmatic rocks. Their quantification can be performed by recently developed modified methods of fractal geometry. (i) A modified Cantor-dust method leads to a direction-related fractal dimension and, consequently, to quantification of fabric anisotropy. (ii) A modified perimeter method allows determination of fractal dimensions of complex curves in relation to their average orientations. (iii) A combination of box-counting method with kriging results in a contour map of the box-counting dimension, revealing the local fabric heterogeneity. (iv) A combination of method iii and a modified Cantor-dust method leads to mapping of fabric anisotropy (Kruhl et al. 2004, Peternell et al. subm.). Automation of these methods allows fast recording, generation of large data sets and the application of quantification methods on large areas (Gerik & Kruhl subm.). It leads to a precision of fabric analysis, not obtainable by manual execution of methods. Specifically, the direction-related Cantor-dust method has proven useful for analyzing magmatic flow structures and quantifying the intensity of flow. Application of this method to different types of syntectonic magmatic rocks will be presented and discussed. References: Gerik, A. & Kruhl, J.H.: Towards automated pattern quantification: time-efficient assessment of anisotropy of 2D pattern with AMOCADO. Computers & Geosciences (subm.). Kruhl, J.H., Andries, F., Peternell, M. & Volland, S. 2004: Fractal geometry analyses of rock fabric anisotropies and inhomogeneities. In: Kolymbas, D. (ed.), Fractals in Geotechnical Engineering, Advances in Geotechnical Engineering and Tunnelling, 9, Logos, Berlin, 115-135. Peternell, M., Bitencourt, M.F. & Kruhl, J.H.: New methods for large-scale rock fabric quantification – the Piquiri Syenite Massif, Southern Brazil. Journal of Structural Geology (subm.)
DE: 1518 Magnetic fabrics and anisotropy
DE: 3625 Petrography, microstructures, and textures
DE: 3900 MINERAL PHYSICS
DE: 4460 Pattern formation
SC: Mineral and Rock Physics [MR]
MN: 2007 Fall Meeting