Neutronographic Fabric Analysis of Quartz in Naturally Deformed Gneiss.

摘要

The crystalline preferred orientations of quartz grains in columnar gneiss from the Erzgebirge (southern GDR) are studied by means of neutron time-of-flight diffraction. A single component texture has been found where the trigonal axes are parallel to the tectonic a-direction. In the quartz c-axis pole figure strong maxima at +-a are related to a gridle of weak intensity being found in optical measurements. From the comparison of expreimentally deformed quartizites and model calaculations the conclusion is made on the approximate conditions of formation of columnar gneiss. 16 refs.; 12 figs.; 1 tab. (Atomindex citation 19:066894)