Citation: | TIAN Zhonghua, LIU Fulai, XU Wang, JI Lei, LIU Lishuang, DONG Yongsheng. 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[J]. Geological Bulletin of China, 2017, 36(11): 1942-1952. |
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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Map of the Paleoproterozoic Jiao-Liao-Ji orogenic belt in the eastern block of the North China Craton (a) and geological map of the Sanjiazi area in the central part of Jiao-Liao-Ji orogenic belt at the scale of 1:50000(b)
A typical cross-section in the western Sanjiazi area in the central part of Jiao-Liao-Ji orogenic belt
Field photographs showing rock-type of the Gaixian Group in the Sanjiazi area of central part of Jiao-Liao-Ji orogenic belt
Photographs showing thrust fault (duplex) developed in marble of the Dashiqiao Formation (a) and the interpretation maps for a(b, c)
A photographs showing many shovel-like normal faults developed in marble of the Dashiqiao Formation (a) and the interpretation for map a (b)
One of field measured cross-sections in the eastern Sanjiazi area along the central part of Jiao-Liao-Ji orogenic belt