黏土是由含鋁的矽酸鹽類礦物所組成，其大小小於2μm，由於雪山山脈帶和脊樑山脈帶的岩層岩性以板岩和硬頁岩為主，含少量變質砂岩，所以無法從顯微鏡中判斷這些地區礦物相的差異性，故本研究希望能利用岩石中的黏土礦物相了解雪山山脈帶和脊樑山脈帶的岩層特徵。本研究以X光繞射分析這些岩層中黏土礦物種類，並計算這些黏土礦物相之含量百分比。本研究結果顯示，脊樑山脈的伊萊石結晶度以淺變質帶～成岩帶為主；雪山山脈的伊萊石結晶度以近變質帶～成岩帶為主。而環山地區的黏土礦物相為伊萊石、高嶺石、綠泥石；高嶺石主要出現於環山地區的西南方，其含量百分比多數為10～20%；環山地區東南方之綠泥石礦物較為富集，其含量百分比多數為20～30%；伊萊石則主要出現於環山地區的西南方，其含量百分比多數為80～90%。
The Hsuehshan Range and Backbone Range belts are mainly composed of slate and argillite with metasandstone which makes it difficult to distinguish clay minerals under microscopies. This study thus employed X-ray diffraction analysis to distinguish and quantify clay minerals of the Hsuehshan Range and Backbone Range belts of Haunshan. The metamorphic grade of Backbone Range belt can be characterized as epizone to diagenetic zone based on the crystallinity of illite while the Hsuehshan Range belt can be classified as anchizone to diagenetic zone. Illite, kaonilite and chlorite are major clay minerals found in the the Haunshan region. Kaonilite appears in the southweatern region with 10-20% and illite presents 80-90% in total while chlorite mainly shows up in the southeastern area with 20-30% in total.
