The Journal of Engineering Geology (지질공학)

The Korean Society of Engineering Geology (대한지질공학회)
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Chemical Weathering Index of Clastic Sedimentary Rocks in Korea

국내 쇄설성 퇴적암의 화학적 풍화지수 고찰

  • Kim, Sung-Wook (Geo-information Research Group Co. Ltd.) ;
  • Choi, Eun-Kyoung (Geo-information Research Group Co. Ltd.) ;
  • Kim, Jong-Woo (Department of Civil and Environmetal Engineering, Korea Maritime and Ocean University) ;
  • Kim, Tae-Hyung (Department of Civil and Environmetal Engineering, Korea Maritime and Ocean University) ;
  • Lee, Kyu-Hwan (Department of Disaster Safety & Firefighting, Konyang University)
  • 김성욱 ((주)지아이 지반정보연구소) ;
  • 최은경 ((주)지아이 지반정보연구소) ;
  • 김종우 (한국해양대학교 건설공학과) ;
  • 김태형 (한국해양대학교 건설공학과) ;
  • 이규환 (건양대학교 재난안전소방학과)
  • Received : 2017.03.03
  • Accepted : 2017.03.25
  • Published : 2017.03.31
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Abstract

Evaluation of the weathering index using the quantitative element composition of rocks is very effective in predicting the degree of weathering of rocks and the secondary weathering residuals. While the process of weathering varies according to the types of rocks, the study of weathering in Korea is concentrated on acidic igneous rocks. This study calculated the weathering indices using whole rock analysis (X-ray fluorescence analysis) of sandstone, mudstone, and shale belonging to clastic sedimentary rocks. The statistical significance of the indices was examined based on the correlation of the calculated weathering indices. Clastic sedimentary rocks showed higher significance of Wp, CIA, CIW and PIA weathering index indicating weathering of feldspar. Chemical Index of alteration (CIA) has the advantage of predicting weathering pathway and clay mineral production, but it is effective to consider chemical index of weathering index (CIW) simultaneously to improve accuracy. In order to reduce uncertainties due to carbonate rocks and to estimate the accurate weathering index, rock samples with high CaO content should be excluded from the evaluation of weathering index.

암석내 화학종의 함량을 이용한 풍화지수는 암석의 풍화 정도와 2차 광물의 생성을 예측하는데 매우 효과적이다. 풍화의 과정은 암석의 종류에 따라 다르게 나타나는데 국내의 경우 화강암의 분포 면적이 넓은 이유로 풍화지수의 연구는 산성질 화성암에 편중되어 왔다. 이 연구는 쇄설성 퇴적암에 속하는 사암, 이암, 셰일의 전암분석(X-선 형광분석)을 이용하여 풍화지수들을 산정하고, 상관성 분석을 통해 지수들의 유의성을 검토하였다. 쇄설성 퇴적암 중 장석의 비중이 높게 나타나는 사암과 셰일의 경우 장석의 풍화를 나타내주는 Wp, CIA, CIW, PIA 풍화지수가 높은 유의성을 보였다. 화학적 변질지수(CIA)는 풍화경로와 변질점토의 생성을 예측할 수 있는 장점이 있으나 풍화 정도의 변별력을 높이기 위해 화학적 풍화지수를 동시에 고려하는 것이 효과적이다. 탄산염 계열의 광물이 포함된 경우 이에 대한 효과를 산정식을 통해 제거하지 못하였고 정확한 풍화지수 산정을 위해 X-선 회절분석 등을 통해 탄산염 물질의 함량이 높은 시료는 분석과정에서 배제해야 한다.

Keywords

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