Application of plagioclase solution degree to evaluating the weathering degree of CDG of granites

Abstract

Using the changing of micro-void of a typical rock-forming mineral, the plagioclase solution degree is proposed as a new index to evaluate the weathering degree. It can elaborately reflect the change of weathering degree of CDG, especially the difference of weathering degree with depth. According to the analyzing of CDG in Hong Kong, the opposite magnitude of weathering degree of samples from three sections is confirmed.

本文提出了以標志性造巖礦物斜長石的顯微孔隙變化為特征的風化度評價新指標——斜長石溶蝕度。該指標可以較好地反映全風化帶(CDG)殘積土風化度的精細變化,特別是風化程度在深度方向上的差異性。通過對香港CDG的實例分析,確定了三處殘積土剖面的風化度相對大小。