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Weathering Characteristics of Sedimentary Rocks Affected by Periodical Submerging  

이석훈 (서울대학교 지구환경과학부)
김수진 (한국기초과학지원연구원 나노환경연구부)
Publication Information
Journal of the Mineralogical Society of Korea / v.17, no.1, 2004 , pp. 23-35 More about this Journal
Abstract
The weathering characteristics of periodically submerged sedimentary rocks in the Sayeon dam, Ulsan was examined by field work, electron probe micro-analysis, X-ray diffraction, and X-ray fluorescence spectrometry. Analysis of fracture zone and exfoliation showed the submerged sedimentary rocks have undergone severe mechanical weathering. Mechanical weathering in the water-rock interface accelerated chemical weathering, such as dissolution and alteration of the most of minerals except for quartz in the weathering zone. The dissolution of carbonates specially calcite, is remarkable creating the cavities, whereas formation of minerals including clay minerals is not active. The sedimentary rocks have been periodically submerged for a certain period of time, and have repeated freezing and thawing. This mechanical weathering favored infiltration, which accelerated mineral dissolution. The high content of easily soluble carbonate of the sedimentary rocks is likely the major cause of intense chemical weathering. The dissolved elements within the infiltrated water interrupted the occurrence of clay and weathering minerals, and expend fractures by infiltrated water accelerated weathering process.
Keywords
submerged sedimentary rocks; weathering zone; calcite; dissolution; weathering mineral;
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