面理弯切轴测量技术在造山带研究中的应用——以美国阿肯色河地区为例

摘要

The measurement of foliation inflection/intersection axes ( FIA) preserved within porphyroblasts, have revealed much more extensive histories of deformation and metamorphism than previously recognized during the study of orogenesis. FIA data have been applied to solving many geological problems, such as investigating tectonometamorphic histories; correlating multiple phases of metamorphism on local and orogenic scales; studying porphyroblast nucleation and growth relative to deformation; reconstructing plate motions; constraining age dates; defining complex deformation partitioning patterns; and investigating pluton emplacement mechanisms and timing. This paper main focused on the significance of FIA data, the measurement of FIA and how it can be applied to solving geological problems. Take Arkansas River region, USA for example to interpret the application of FIA measurements in regional and detail study of deformation process during orogenesis.%基于变形分解理论提出的面理弯切轴测量技术,通过对变斑晶中多期面理的测定分析,为厘定造山运动中的变形过程提供了新的精确定量研究手段.面理弯切轴数据已经被用于解决地质领域多种问题,例如:研究造山运动过程中变形变质历史以及在区域和造山带尺度对比多期变质作用；论证变斑晶生长过程是否发生旋转；变斑晶成核生长与区域变形过程之间的关系；重建板块运动历史过程；约束不同地质事件的发生时限；划分复杂变形分解类型以及岩浆侵位机制及时限研究.本文主要介绍面理弯切轴测量方法的原理、具体测定方法、研究意义及应用范围,并以美国阿肯色地区为例,详细介绍了面理弯切轴测量技术在造山运动过程区域变形历史重建中的应用.