The Journal of the Petrological Society of Korea (암석학회지)

The Petrological Society of Korea (한국암석학회)
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GIS-based Areal Distribution Ratios and Characteristics of Constituent Rocks with Geologic Ages and Rock Types in Jeonnam and Gwangju Areas

전남과 광주지역 구성암류의 GIS에 의한 지질시대별 암층별 분포율 및 분포특성

  • Yun, Hyun-Soo (Geological Research Division, Korea Institute of Geoscience & Mineral Resources (KIGAM)) ;
  • Lee, Jin-Young (Geological Research Division, Korea Institute of Geoscience & Mineral Resources (KIGAM)) ;
  • Hong, Sei-Sun (Geological Research Division, Korea Institute of Geoscience & Mineral Resources (KIGAM)) ;
  • Yang, Dong-Yoon (Geological Research Division, Korea Institute of Geoscience & Mineral Resources (KIGAM)) ;
  • Kim, Ju-Yong (Geological Research Division, Korea Institute of Geoscience & Mineral Resources (KIGAM)) ;
  • Cho, Deung-Lyong (Geological Research Division, Korea Institute of Geoscience & Mineral Resources (KIGAM))
  • 윤현수 (한국지질자원연구원 국토지질연구본부) ;
  • 이진영 (한국지질자원연구원 국토지질연구본부) ;
  • 홍세선 (한국지질자원연구원 국토지질연구본부) ;
  • 양동윤 (한국지질자원연구원 국토지질연구본부) ;
  • 김주용 (한국지질자원연구원 국토지질연구본부) ;
  • 조등룡 (한국지질자원연구원 국토지질연구본부)
  • Received : 2013.05.28
  • Accepted : 2013.06.16
  • Published : 2013.06.30
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Abstract

To get the various data on geological information, distributional ratios and characteristics of constituent rocks with geologic ages and rock types were obtained by ArcGIS 10.1 program, digital geologic and geomorphic maps of 1:250,000 scale in Jeonnam and Gwangju areas. In the Jeonnam area, geologic ages can be largely divided into 7, in which their distribution ratios show decreasing trends in the order of Cretaceous, Precambrian, Jurassic, Quaternary, Age-unknown, Carbonifeorus-Triassic and Triassic, and the former fours make the most prevailing ratios of 94.80%. Rock types in the area can be assorted into 57 ones, in which major 7 ones occupy the dominant ratio of 71.68%. Among them, Kav (acidic volcanics+rhyolite and rhyolitic tuff) show much more distribution ratios than the others. It shows more aspects distributed in north, west, middle, east and south parts, especially in Sinan-Mogpo-Yeongam of west and Haenam of south parts in the area, respectively. On the other hand, geological ages in Gwangju area can be largely divided into 5, in which their distribution ratios show decreasing trends in the order of Jurassic, Quaternary, Cretaceous, Precambrian and Age-unknown, and the former fours occupy almost the whole ratio of 98.95%. Rock types in the area are 12 ones, in which major four ones make up the dominant value of 91.30%. Among them, Jurassic granites of the most dominant value are mostly occupied in the southwest-northeast part of the area. Next dominative Quaternary alluvium is mostly developed along the Yeongsan river, the Hwangryong river and their channel junction. And Yongdu and Donggye plains are well developed around the Yeongsan riverline, and channel junction of the Yeongsan and Hwangryong rivers in the area, respectively.

국토의 효율적 관리를 위한 각종 지질정보자료로 활용될 수 있도록 ArcGIS 10.1 프로그램, 1 대 250,000의 수치지질도 및 지형도를 사용하여 전남과 광주지역 구성암류의 지질시대별 및 암층별 분포율과 분포특성을 도출하였다. 전남지역 의 지질시대는 모두 7개로 대분되며, 분포율은 백악기, 선캠브리아기, 쥬라기, 제4기, 시대미상, 석탄기-삼첩기 및 삼첩기의 순으로 감소하며, 그 중 전자 넷이 94.80%를 이루어 거의 대부분을 차지한다. 구성암층은 선캠브리아기 15개, 시대미상 6개, 석탄기-삼첩기 3개, 삼첩기 2개, 쥬라기 4개, 백악기 25개 그리고 제4기 2개로서 도합 57개에 달한다. 분포율은 백악기의 Kav(산성 화산암류+유문암 및 유문암질 응회암)와 Kiv(중성 및 염기성 화산암류+안산암 및 안산암질 응회암), 선캠브리아기의 지리산편마암복합체(소백산육괴)인 화강편마암과 반상변정질 편마암, 제4기의 충적층, 쥬라기의 화강암류와 엽리상화강암의 순으로 감소하며 이들이 도합 71.68%의 우세한 값을 이룬다. 그 중 뚜렷하게 우세한 Kav는 전남지역의 북부, 서부, 중부, 동부 및 남부에 보다 넓게 발달하며, 특히 서부인 신안 및 목포-영암, 남부인 해남일대에 더 우세하게 분포하는 양상을 보인다. 광주지역의 지질시대는 모두 5개로 대분되고 분포율은 쥬라기, 제4기, 백악기, 선캠브리아기 그리고 시대미상의 순으로 감소하며, 그 중 전자 넷이 98.95%를 가져 거의 전부를 이룬다. 구성암층은 선캠브리아기 1개, 시대미상 2개, 쥬라기 2개, 백악기 6개와 제4기 1개로서 도합 12개에 달한다. 분포율은 쥬라기 화강암류, 제4기 충적층, 선캠브리아기의 소백산편마암복합체인 화강편마암과 백악기 Kiv 순으로 감소하고 도합 91.30%를 가져 그 대부분을 차지하며 전자 둘에서 뚜렷하게 우세하다. 가장 우세한 화강암류는 대부분 광주지역 남서부에서 북동부 방향에 걸쳐 발달한다. 충적층은 대부분 황룡강, 영산강과 이들의 합류부에 발달하며, 북구에서는 영산강변에서 용두평야 그리고 광산구에서는 영산강과 황룡강 합류부에서 동계평야 등을 이룬다.

Keywords

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