摘要(英) |
The study area is from Techi to Lishan in central Taiwan. It is belonging to the Tertiary Slate formation of the orogenic belt. According to previous research, there is only one penetrative slaty cleavage set which belongs to axial plane cleavage and bears NE-SW strike with steep dip angle in study area. We can discover some low-angle cleavage attitude at slopes near the highway in the field. This result is different to the attitude of axial plane cleavage, therefore it brought us the reason to do this study.
In this study, we have measured 375 typical attitudes of cleavage in the field, and has used statistical analysis to find out the characteristics of cleavage attitude distribution. The result shows that the cleavage attitudes may be divided into three groups. Mean attitude of the first group is N48°E/37°S±17°, the second is N39°E/89°S±17°, and the third is N53°E/41°N±18°.
We use MapInfo geographic information system to analyze the relationships between the cleavage attitude and the slope direction, and also the slope gradient. The result shows that the first and the third group of cleavage attitude have close relationship with the slope direction and slope gradient. In general, the cleavage attitude is striking roughly parallel to the hill slope. The first group of cleavage attitude is closely related to NW facing slopes. The third group of cleavage attitude is closely related to SE facing slopes. Both the first and the third group cleavage attitude are almost located at the steeply slopes.
The cleavage attitude of the second group generally located at riverside of the Tachia Creek and its major tributaries. It has no relationship with the slope direction and also slope gradient. The second group of cleavage attitude is similar to be the attitude of the fold axial plane, and is regarded as the axial plane cleavage of the Slate formation in the study area.
The change of the cleavage attitude is thought to be affected by large-scale hill creep in the high mountain area. Field check results reveal that cleavage attitude affected by hill creep really appear in the study area. Facts include bended cleavage, joint cut by cleavage, and bowed trees on the surface. |
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