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NTIS 바로가기지질공학 = The journal of engineering geology, v.27 no.1, 2017년, pp.67 - 79
김성욱 ((주)지아이 지반정보연구소) , 최은경 ((주)지아이 지반정보연구소) , 김종우 (한국해양대학교 건설공학과) , 김태형 (한국해양대학교 건설공학과) , 이규환 (건양대학교 재난안전소방학과)
Evaluation of the weathering index using the quantitative element composition of rocks is very effective in predicting the degree of weathering of rocks and the secondary weathering residuals. While the process of weathering varies according to the types of rocks, the study of weathering in Korea is...
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핵심어 | 질문 | 논문에서 추출한 답변 |
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대표적인 풍화는 어떻게 구분되는가? | 대부분 암석은 지표환경보다 높은 온도와 압력 조건에서 형성되며 암석이 지표에 노출되면 낮은 온도, 압력, 지표수 등의 영향으로 변형(변질)되며 이러한 과정은 풍화의 형태로 나타난다. 대표적인 풍화는 화학조성의 변화 없이 물리 적으로 매질이 분리되는 물리적 풍화작용과 수분과 암석을 구성하는 원소의 반응으로 광물이 분해되는 화학적 풍화작용으로 구분된다. 기계적 풍화로 인해 세립화된 암석은 표면적이 증가하여 수분과 접촉하는 면적이 증가하기 때문에 화학적 풍화 가속되는 원인이 된다. | |
조암광물에서 이동성에 따라 화학종이 어떻게 분류되는가? | 화학적 풍화로 용탈되는 원소의 양과 이동도는 광물을 구성하는 원소의 종류에 따라 달라진다. 조암광물에서 이동성이 높은 화학종으로는 알칼리금속과 알칼리토금속은 K2O, Na2O, CaO, MgO이 대표적이며 이동성이 낮은 화학종으로는 TiO2, Al2O3, FeO, MnO, P2O5가 있다. 풍화로 인해 광물을 구성하는 원소는 천천히 용탈되며, 일반적으로 용탈 되는 양과 속도는 원소에 따라 달라진다. | |
화학적 풍화지수와 관련하여 어떤 선행연구가 활발하였는가? | 특히 화학적 풍화지수는 풍화를 받기 이전의 광물 조성과 풍화반응 후 생성물의 함량 비로 표현되는데 암석마다 풍화과정이 서로 다르게 나타나므로 암석의 종류에 따라 다양한 지수가 제안되었다. 그중에서 풍화에 의해 암석의 화학조성 변화와 주요 원소의 상대적 이동에 이용한 지구화학적인 선행연구가 활발하였고 (Nam, 1971, 1987; Nam and Cho, 1993; Chesworth, 1973; Delvaux et al., 1989; Marsh, 1991; Condie et al. |
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