The role and significance of structural deformation in metamorphic rock mapping:A case study of the Liaohe Group mapping in central segment of Jiao-Liao-Ji orogenic belt
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摘要:
论述了构造解析在变质岩专题填图过程中的作用及其意义。主要围绕以下5个方面：①构造解析在高级变质岩区地质调查中对重大地质边界的识别作用；②通过构造解析区别变质岩区不同岩石和/或构造单元因构造发生的堆叠作用；③通过构造解析识别并区分不同岩石单元的构造类型、期次和组合样式；④变质岩填图区剖面测制及地层原始厚度恢复需要在构造解析工作基础上进行；⑤变质岩区地质填图工作实际上是构造解析和变质岩石学的有机结合过程。总之，构造解析对变质岩填图区内地质情况的客观表述具有重要的意义。
Abstract:Based on the mapping of the Liaohe Group in the central segment of Jiao-Liao-Ji structural belt in the past several years, this paper mainly presents the implications of structural deciphering work applied to the metamorphic area geological mapping, which include the following five aspects:①As the significant geological boundary between the groups cannot be easily recognized, the authors emphasize the function of structural deciphering work when it is used to trace the hidden boundary; ②Different rock units or formations are often mixed with each other due to later deformation, and structural deciphering therefore should be used in this situation to distinguish different rock units (strata); ③Structural deciphering work must be carried out to trace all the different structural styles and deformation stages; ④Evaluation of the thickness of strata in the metamorphic area should be considered through structural deciphering work in the first time; ⑤The combination of deformation and metamorphism is very important in metamorphic mapping area. In all, structural deciphering is a useful tool to figure out the true geological fact in a metamorphic mapping area.
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