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Development of a streamflow-dominated alluvial-fan system in the southwestern margin of Gyeongsang Basin (Lower Cretaceous): implications for initial basin-fill history

  • Jeong-Hyun Lee
  • Sung Kwun Chough
  • Hyung Rae JoEmail author
Article
  • 25 Downloads

Abstract

This paper focuses on the initial basin-fill processes in an extensional nonmarine back-arc basin. Sedimentary facies analysis in the southwestern part of the Gyeongsang Basin (Jinju Subbasin), Hapcheon area reveals that the succession consists of four facies assemblages. The assemblage I mainly consists of disorganized conglomerate deposited by flash floods in a streamflow-dominated alluvial fan. The assemblage II is dominated by stratified conglomerates and massive, stratified, and cross-stratified sandstones, showing architecture of stacked channels and bars. The assemblage III largely comprises massive, stratified to laminated, and trough cross-stratified sandstones, which are organized into channel-fill and bar-accretion structures. It most likely formed in sandy sinuous rivers. The assemblage IV comprises gray mudstone interlayered with fine sandstone, representing water-logged floodplains. Conglomerate and sandstone bodies formed in the fluvial systems appear to be randomly distributed within floodplain fines, displaying a great lateral and vertical lithologic variation. This study helps understand the complexity of basin-fill history, i.e., switching of fluvial networks in time and space, in contrast to the simple notion of margin-parallel stacking of lithostratigraphic units.

Key words

alluvial fan fluvial system nonmarine deposit Gyeongsang Basin Hapcheon area 

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Copyright information

© The Association of Korean Geoscience Societies and Springer-Verlag GmbH Germany, part of Springer Nature 2019

Authors and Affiliations

  • Jeong-Hyun Lee
    • 1
    • 2
  • Sung Kwun Chough
    • 1
  • Hyung Rae Jo
    • 3
    Email author
  1. 1.School of Earth and Environmental SciencesSeoul National UniversitySeoulRepublic of Korea
  2. 2.Department of Geology and Earth Environmental SciencesChungnam National UniversityDaejeonRepublic of Korea
  3. 3.Department of Earth and Environmental SciencesAndong National UniversityAndongRepublic of Korea

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