大同─集宁地区太古代变质杂岩的构造变形特征

大同－集宁地区太古代变质杂岩由葛胡窑灰色片麻岩系和丰镇群孔兹岩系两部分组成。根据普遍的构造交切关系及构造样式的有规律性变化，将大同－集宁地区太古代变质杂岩划分成４个构造变形序列，Ｄ－１变形仅仅在灰色片麻岩系中有发育，Ｄ＿（２－４）变形在两套岩系中均有发育，其中Ｄ＿（２－３）变形是区域性控制构造。同时对葛胡窑灰色片麻岩系和丰镇群孔兹岩系中褶皱的产状类型，褶皱的几何形态以及线理进行了系统的分析对比。两套岩系之间，在上述各方面的特征存在着系统的差异。反映了两套岩系具有不同的构造物理环境和变形演化历史。进一步证实了两套岩系之间存在着不整合接触关系。

STRUCTURAL DEFORMATION FEATURES OF ARCHEAN METAMORPHIC COMPLEX IN DATONG-JINING REGION

Archean metamorphic complex in Datong-Jining region is composed of Gehuyao graygneiss suite and Fengzhen Group khondalite suite.The metamorphic complex could be divid-ed into four sequences of the structural deformation based upon common and nonaccidentalrelationship of the structural intersection and regular variation of the structure form.D_1structural deformation only developed in Gehuyao gray gneiss.D_(2-4) structural deformationdeveloped both in Gehuyao gray gneiss and Fengzhen Group khondalite suites,but D_(2-3) isthe deformed structure under region control.The author has discussed the stages of struc-tural deformation,the occurrence types and the geometrical patterns of the folds,and theregular variation of the lineation statistics in the Gehuyao gray gneiss and Fengzhen Groupkhondalite suite,and find systematic differences between them.Results show that both ofGehuyao gray gneiss suite and Fengzhen Group khondalite suite are different in structuralphysical condition and structural deformation history.All of the discussed above may revealan unconformity between the Gehuyao gray gneiss suite and Fengzhen Group khondalite suite.