Experimental and Natural Rock Deformation / Experimentelle und natürliche Gesteinsverformung: Proceedings of the International Symposium Darmstadt, February 17–18, 1969

Ten years have passed since the last symposium on "Rock Deformation" was held in Los Angeles. The intervening period has seen striking advances in X-ray and experimental structural petrology. The Symposium of the Working Group on X-Ray and Experimental Structural Petrology, held at the invitation of the Deutsche Forschungsgemeinschaft on 17 and 18 February, 1969, in the Mineralogy Institute of the Technische Hochschule Darmstadt, was intended to display the progress made in this field. A meeting on the same had been held in 1968 at the Mineralogy Institute of the Technische Hochschule Aachen. The outcome of many years of effort has been the development of new, automated in­ struments for the X-ray processing of specimens. The X-ray and optical data so obtained are processed by computer to give complete texture diagrams; it is also possible to rotate the coordinates, and to make an indirect determination of data which have not been measured. In experimental structural petrology, the temperature and pressure dependence of the translational system has been studied in minerals from various types of rock formation which had not previously been investigated, and deductions were made concerning certain mineral parageneses. The original contributions on field findings were conceived and executed so as to point up the possible links with experimental work on structural petrology. They determine for a given mineral facies the pressure and temperature ranges to be applied in experimen­ tal studies of deformation in single crystals and in rocks.

Table of Contents:
1 X-ray Petrofabric Analysis.- 1.1 X-ray Petrofabric Analysis of Quartz-Schists from Central Shikoku, Japan, by X-ray Texturegoniometer.- 1.2 Calculation of X-ray Diffraction Patterns for Anisotropie Mineral Aggregates.- 1.3 A Computer Programme to Construct Spherical Projections A Computer Programme to Prepare Orientation Diagrams.- 1.4 The Use of X-Rays in Petrofabric Studies.- 1.5 Texture X-ray Goniometer by Lücke with automatic record of the corrected pole-figure.- 1.6 Garnet Orientation in Different Metamorphic facies.- 2 Experimental Structural Petrology.- 2.1 Experimental Deformation of Constrained Crystals of Calcite in Extension.- 2.2 Lattice-Orienting Mechanismus in Schistose Anhydrite.- 2.3 Experimental Deformation of Galena Ores.- 2.4 Strength-and Fabric-Research of Experimental and Naturally Deformed Zinc-blende Ores.- 2.5 Application of the Anisotropy of Magnetic Susceptibility in the Determination of Magnetite Orientation.- 2.6 Observation of Superfine Fabrics with the Scanning Microscope.- 2.7 Syntectonic Recrystallization and Annealing of Quartz Aggregates.- 2.8 Preferred Orientation Patterns in Monomineralic Rocks under directed Stress.- 2.9 Experimental Deformation of Plagioclases.- 3 Field Work.- 3.1 Folding about Vertical Axes in the Basement of the Renström Area, Skellef-tefeld, North Sweden, in an Montan-and Engineer-Geological View.- 3.2 Contribution to the Typification of Oblique Girdle Patterns in Quartz Tectonites.- 3.3 On the Formation of Steeply Oriented B-Axes Demonstrated by a Cross-section in the Hohen Tauern (Dorfertal, Großvenedigerbereich).- 3.4 Principal Olivine Fabrics: Their Tectonic and Metamorphic Significance.- 3.5 Metric and Topological Properties of Rock and Ore Textures.- 3.6 Tectonics and Mineralization in the Cobalt Areaof Canada: Some New Aspects.