Journal of Jilin University(Earth Science Edition) ›› 2019, Vol. 49 ›› Issue (3): 737-745.doi: 10.13278/j.cnki.jjuese.20180023

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Characteristics of Superposed Folds of Pyongnam Basin in Korean Peninsula

Kim Byongsong1,2, Liu Yongjiang3,4, Byon Changnam5, Pak Myonghwa5   

  1. 1. School of Earth Sciences and Resources, China University of Geosciences, Beijing 100083, China;
    2. College of Resources Exploration Engineering, Kim Chaek University of Technology, Pyongyang, 999162, Korea;
    3. College of Marine Geo-Sciences, Ocean University of China, Qingdao 266100, Shandong, China;
    4. College of Earth Sciences, Jilin University, Changchun 130061, China;
    5. College of Coal Industry, Pyongnam University, Pyongsong, 999093, Korea
  • Received:2018-01-30 Online:2019-06-03 Published:2019-06-03
  • Supported by:
    Supported by National Key R & D Basic Program of China(2017YFC0601300-01)

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Abstract: The inverted folds developed in the sedimentary cap rocks in the Pyongnam basin are generally considered to be subordinate folds of upright folds. According to the detailed investigation and the geological and drilling data obtained in the process of coal development, we think that the main recognition marks of the superposed folds in the basin are as follows:The intersection of two different ridge lines of fold on the geological plane map; The axial surface of inverted folds reformed by upright folds; The inverted folds that developed in the two limbs of upright folds and showed the nature of two groups of traction folds. There are three stages of folds identified in the Pyongnam basin:the first stage is the E-W trending inverted folds formed in Indosinian stage; the second stage is the E-W trending upright folds formed in Early Yanshanian stage; and the third stage is the NNE trending upright folds formed in Late Yanshanian stage.

Key words: Pyongnam basin, sedimentary cover, superposed folds, inverted folds

CLC Number: 

  • P548
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