二仁溪流域泥質岩體內一些環境地質問題的探討

二仁溪流域內的丘陵區分佈的地層有礫石層、頁岩層、砂岩層、泥岩層和砂岩頁岩互層，其中之頁岩層、泥岩層和砂岩頁岩互層即為泥質岩體，佔相當大的面積，在此範圍內的構造線有木柵斷層、旗山斷層、鼓山斷層、橋子頭斷層、龍船斷層、古亭坑斷層、內門內斜、田寮內斜、田草寮向斜、小滾水背斜、坑內構造和龍船構造，這些構造線大部分切過泥質岩體，或在泥質岩體附近，泥質岩體均受到不同程度的影響，對本流域全區所作的地形計測為平均高度在60－80公尺，平均坡度6度，平均起伏度40公尺，河谷密度為每平方公里有2.31公里，泥質岩體內的特殊地形有惡地地形、獨立岩體地形、泥火山地形、曲流和牛軛湖地形、半面山地形。對本區泥岩質岩石的酸鹼度測定為泥岩PH值7.71－9.10，頁岩7.98－9.52，鹽度為泥岩0.06－1.5%，頁岩0.06－0.6%，黏土礦物為伊萊石30.32%，綠泥石28.34%，細小石英粒27.7%，方解石4.57%，高嶺土4.78%，以非膨脹性黏土礦物為主。

關鍵字

泥質岩體；特殊地形；泥岩特性；環境地質

並列摘要

The Strata distributed in the hill area of Erh-Jen-Chi drainage include conglomerate shale sandstone mudstone and sandsone-shale alternation formations. Among these formations, shale mudstone and sandstone-shale alternation formations are muddy in nature. These muddy formations occupy 80% of this hill area. The structural lines in this area include Mu-Cha Fault, Chi-Shan Fault, Ku-Shan Fault, Chiao-Tzu-Tou Fault, Lung-Chuan Fault, Ku-Ting Fault, Nei-Men Syncline, Tien-Liao Syncline, Tien-Tsao-Liao Syncline, Hsiao-Kun-Shiu Anticline, Keng-Nei Structure and Lung-Chuan Structure. Most of these structural lines have passed through the muddy area or near the muddy area. These muddy formations have been more or less influenced by these structures. The data of the quantitative geomorpological analysis of this area have been collected. T he average altitude is 60-80m, average slop 6°, average relief 40m. The density drainage is 2.31km / km^2. The special land forms distributed in muddy formation area are bed lands, independent rock bodies, mud volcanoes, meanders and ox-bow lake and hogbacks. The PH value of mudstone is 7.71-9.10, but that of shale is 7.98-9.52. T he salinity of mudstone is 0.06-1.5%, but that of shale is 0.06-0.6%, T he clay minerals cousist of 30.32% illite, 28.34% chlorite, 27.7% fine guartz, 4.57% calcite, and 4.78% kaolinite. All of these are non-swelling clay minerals.

並列關鍵字

muddy rocks ； special landforms ； characteristics of mudstone ； environmental geology

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二仁溪流域泥質岩體內一些環境地質問題的探討

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