Feldspar-based chemical weathering index of shales in Korea

Abstract

This study calculated the weathering index using whole rock analysis (X-ray fluorescence analysis) of shale in Korea. Evaluation of the weathering index using the quantitative element composition of rocks is very effective for predicting the degree of weathering of rocks. Shale showed higher significance of Wp, CIA, CIW and PIA, the feldspar-based weathering index, while chemical species with low mobility and index considering SiO2 ratio had no significance. One of the feldspar-based indexes, the Chemical Index of alteration (CIA) has the advantage of predicting weathering, weathering pathway and clay mineral production. However it is effective to consider together chemical index of weathering index (CIW) simultaneously to improve accuracy. Copyright ? Soil Mechanics and Geotechnical Engineering, ARC 2019.All rights reserved.