中澳洲Florence剪切带中角闪石晶体优选定向(英文)

CRYSTALLOGRAPHIC PREFERRED ORIENTATION AND SLIP SYSTEM OF HORNBLENDE IN THE FLORENCE SHEAR ZONE, CENTRAL AUSTRALIA

中澳洲Ｆｌｏｒｅｎｃｅ 剪切带糜棱岩中的角闪石经晶内滑移变形而显示出良好的晶体优选定向，通过对角闪石岩组图的综合分析，并结合前人的实验资料，认识到在高温变形条件下角闪石的滑移系为（１００）［００１］。该剪切带中角闪石岩组图具不对称型式是与角闪石的单一滑移系和该滑移系的初始定向状态有关，是非共轴简单剪切变形的结果。

Hornblende grains in the mafic mylonites of the Florence Shear Zone,central Australia have gained strong crystallographic preferred orientations by the deformation process of intracrystalline glide.Composite analysis of preferred orientation pole figures,combined with experimental data made by previous workers,leads to the recognition that at high temperature deformation the slip system of hornblende is mainly (100)[001].These preferred orientation pole figures presented are characterized by uneven distribution and asymmetric patterns which are thought to be related to the hornblende single slip system and the initial orientation of the slip system with respect to the kinematic framework during a non-coaxial simple shear regime.The inference of shear sense from the asymmetry of these pole figures is made and it is compatible with that determined from the quartz c-axis single girdle patterns as well as from other microstructural indicators in the same shear zone.