암석의 특성과 풍화 미지형과의 관계에 대한 연구 -심곡 지역의 셰일과 사암을 사례로- = A study on the relationship between characteristics of rock and micro-weathering forms -Cases of shale and sandstone in Simgok-

다국어 초록 (Multilingual Abstract)

The weathering forms of sandstone and shale in Simgok, Kangneung, Gangwon are studied with reference to chemical composition of each rock type. Most of sandstone showed roughening of exposed surface due to removal of matrix material between sand particles. In the case of coarse sandstone, no significant weathering forms are found except slightly enlarged pores between particles. Small tafoni or alveoli are found near or along the structural weak lines, like joint, plane and fault which working as a circulation route for water. Various micro-forms, meanwhile found from the shale. Dark stain or black coating on the rock surfaces found from exposed part of shale and only the wall of alveoli survived while most other part of the surface are dissolved or disintegrated. As a result the rock surfaces of the shale resembles those of basalt. This differences in weathering caused by the different chemical composition of shale and sandstone. In the case of silica(SiO2) which is resistant to the chemical weathering composed 88∼95.4% of sand stone while 54.6∼45.2% for the shale. Iron and aluminium oxide showed higher portion for the shale than sandstone. It is not clear whether this difference originated from the rock itself or rate and speed of chemical weathering. However, this difference in chemical composition strongly affect the characteristics of weathering in this area. It also should be noted that the red coatings are found both sand stone and shale. Those of shale are far thicker than those of sandstone and it could be caused influenced by the composition of parent rocks and rate of water circulation within the rock.

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