관악산의 화강암 지형 연구

Abstract

The protruding granite landforms can be classified into three groups in the Mt. Kwanak. They are the Dome Inselbergs, the Castellated Inselbergs and the large-scale quadrangular rock columns.A plane figure of each protruding landform was greatly influenced by the strike of the columnar joints in granite. And the distinct and continuous columnar joints developed from the faint and discrete columnar joints by stress relaxation at the outer position of granite landform.The Dome Inselbergs, the Castellated Inselbergs and the large-scale quadrangular rock columns were formed from weathering front in their primary stage. The curvaceous micro forms by chemical weathering of granite exist on the crest of most of those landforms.In case of the Dome Inselbergs, the outer shell of the Inselbergs was separated from main granite body by sheeting joints. Meanwhile, the sheeting shell of the Inselbergs was divided into small cubic rock blocks by perpendicular joints to the surface of the Inselbergs. So the Dome Inselbergs were partly transformed to the Nubbins. Some Castellated Inselbergs are located at the lowest step of long steep ridges now. The upper saddles of the Castellated Inselbergs along the ridges developed from the Moats which had formed by chemical weathering of granite by water moving down the long steep slopes.