南部橫貫公路禮觀地區鏡煤素反光率及其地質意義
摘要
南橫公路禮觀地區梅山層（中新世）、禮觀層（中新世）及檜谷層（始新世）之34個泥質岩標本經量測鏡煤素，以禮觀橋斷層為界，其西平均最大鏡煤素反光率（Rmax），梅山層為1.57﹪~3.04﹪（Rmax平均值:2.23﹪），禮觀層為2.05﹪~2.84﹪（Rmax 平均值:2.41﹪），最下部的檜谷層為2.53﹪~2.66﹪（ Rmax平均值:2.62﹪）；而以東之梅山層為2.83﹪~5.08﹪（ Rmax平均值:4.05﹪），檜谷層為5.33﹪~6.58﹪（Rmax 平均值:6.13﹪）。
之分布在禮觀橋斷層以西之梅山層、禮觀層及檜谷層之各地層內，並不隨地理位置呈現規則性的變化，但仍可以顯現各地層的 平均值與地層層位之高低有正相關性。而在禮觀橋斷層以東之梅山層 愈向東則愈大，此反映斷層東側之梅山層掩埋的深度可能較禮觀橋斷層以西之梅山層較深。檜谷層 之分布亦有此現象。這些現象暗示在上新－更新世蓬萊運動時變質溫度自禮觀橋斷層始有明顯的向東漸增之趨勢。
禮觀層 比東側之梅山層之值小很多，似乎更可以確認在蓬萊運動發生之前，禮觀地區在中新世早期末已是一個地壘構造。

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