本研究路線為橫亙中央山脈之能高越嶺路，利用X光繞射儀分析岩石中伊萊石結晶度值，其數值高低以陳肇夏所劃分成岩帶－近變質帶－淺變質帶之界限作為依據，其研究結果顯示岩石中伊萊石結晶度值的變化為：埔里至小櫻橋之間，屬於淺變質帶；小櫻橋至縣界之間，屬於近變質帶；而縣界往東至銅門，其伊萊石結晶度則又逐漸變小，屬於淺變質帶。且本文區域內沿線伊萊石結晶度值由西至東整體的變化由淺變質帶逐漸轉變成近變質帶再逐漸轉變為淺變質帶，此一結果與前人研究的變質相分布相符，但相與相之間的位置有所差異。另外，本研究區域內廬山層中於霧社複向斜處剛好其伊萊石結晶度值呈現驟變的變化，但此一變化是否受構造影響，則須進一步探討。
In this study, the illite crystallinity of rocks sampled along the Neng-Kao Pass across Central Range, were investigated using X-ray diffraction method. According to the previous geological zoning of illite crystallinity distribution identified by Chen, that is, diagenetic zone (0.38△°2θ), anchizone (0.38~0.22△°2θ) and epizone (＜0.22△°2θ), the results of this study show that the illite crystallinity of the area from Puli to Xiao-Ying Bridge belongs epizone, while the interval between Xiao-Ying Bridge and Hsienchieh (county boundary), and from Hsienchieh (county boundary) to Tongmen were anchizone and epizone, respectively.On the whole, the illite crystallinity pattern from the west to east side of the Neng-Kao Pass varies from epizone to anchizone, then transfer gradually to epizone again, which is almost consistent with the metamorphic phases of Taiwan. But there is a little different in the position between phases. Furthermore, it also shows anomaly variation of illite crystallinity on the area closed to Wushe synclinorium of the Lushan Formation. Whether it was affected by folding or faulting, thus, discussion in details will be performed.
