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http://dx.doi.org/10.9720/kseg.2017.1.67

Chemical Weathering Index of Clastic Sedimentary Rocks in Korea  

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)
Publication Information
The Journal of Engineering Geology / v.27, no.1, 2017 , pp. 67-79 More about this Journal
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.
Keywords
clastic sedimentary rocks; whole rock analysis; weathering index; chemical index of alteration; statistical significance;
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