本文以Ｘ光繞射峰形與極像分析方法研究中部橫貫公路低度變質泥岩中白雲母與綠泥石之結晶度、晶體粒徑、晶格應變和優勢排列型態及強度，以探討組構與再結晶作用在前進變質過程中之演化及其受構造活動之影響。
中橫公路低度變質泥岩大致隨著岩層埋藏深度之增加，白雲母和綠泥石結晶度指數降低，晶體粒徑增加，而晶格應變減少。但佳陽層較其下部埋藏較深之達見砂岩的結晶度為佳，晶體粒徑亦較大。整體而言，白雲母在近變質帶相對於綠泥石晶體粒徑相似，但有較高之晶格應變，而在淺變質帶及青山斷層、梨山斷層與松泉崗斷層和關原斷層間之韌性剪切帶等高應變區，白雲母與綠泥石相同地具有較小之晶格應變值，且晶體粒徑顯著增大。
白雲母和綠泥石極像圖形態隨著變質度之增加由鬆散之左右拉長橢圓轉變至緊密之菱形或圓形。高應變區極像圖形態之特徵則為上下拉長之橢圓或細長不對稱橢圓，其上下拉長程度及對稱性受控於優勢排列之晶體變形彎曲情形或後期劈理發育之程度及其與前期劈理之夾角。此外，在淺變質帶與高應變區具有第二組微組構之岩樣，白雲母比綠泥石呈現相對顯著之兩組拉長橢圓重疊的現象。白雲母和綠泥石極像圖之極點強度大致上隨結晶度指數降低而有增強之趨勢，但在淺變質帶及高應變區因受後期劈理發育之影響，使圖形較鬆散而極點強度減弱。
上述結果顯示再結晶作用在淺變質帶與高應變區顯著增強，使白雲母和綠泥石結晶度指數降低、晶體粒徑增大、晶格應變減小、極像圖形態趨於緊密和極點強度增高。佳陽層相較於達見砂岩有較佳之結晶度與晶體優勢排列程度，可能因其岩性較易受構造應力滲入造成。高應變區因受構造應力之影響而發生強烈再結晶作用，顯示其變質變形作用發生在低構造階層。白雲母在淺變質帶和高應變區之晶格應變和極像圖形態調整相對顯著，顯示其比綠泥石有較強之結晶／再結晶能力。中橫公路泥質岩之低度變質作用整體而言受構造深埋作用之控制，但局部明顯受低構造階層構造活動所引起之動力再結晶作用及岩性影響。

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