Journal of the Geological Society of Korea (지질학회지)

The Geological Society of Korea (대한지질학회)
권호 표지

Weathering of Plagioclase in Palgongsan Granite

팔공산 화강암내 사장석의 풍화

Jeong, Gi-Yeong;Lee, Byeong-Yun
정기영;이병윤

  • Published : 19980300

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Abstract

Mineralogical and textural study for a weathering profile of Cretaceous Palgongsan granite shows that halloysite is a major weathering product of plagioclase and that a small amount of hydroxy-interlayered smectite has formed in the lowermost part of the profile. Halloysite was initially precipitated along micro-fissures of plagioclase as wrinkled walls of compact aggregates forming a boxwork structure. In a later stage, halloysite particles eroded from soil surface were transported in suspension by rainwater migrating downward and coated the walls of compact halloysite aggregates. Hydroxy-interlayered smectite was precipitated from stagnant Si-rich solution in the narrow micro-fissures of plagioclase during the earliest weathering stage. As voids were widened by continuous dissolution of plagioclase, halloysite was precipitated dominantly throughtout the profile from rather diluted solutions under mobile environment. Halloysite is believed to have formed as a kinetically metastable mineral prior to kaolinite in the relatively young weathering profile.

팔공산 화강암에 발달한 풍화 단면의 광물 및 조직 분석 결과, 전 단면에 걸쳐서 할로이사이트가 사장석의 주된 풍화물로 생성되었고, 소량의 층간수산화물 스멕타이트가 단면 최하부의 사장석 열극을 따라 생성되었음이 밝혀졌다. 풍화 초기에 할로이사이트는 사장석 열극을 따라 꾸불꾸불한 벽모양의 치밀한 집합체로 침전되었으며, 벽들이 상호 복잡하게 연결되어 망상 구조가 형성되었다. 후기에 사장석의 활발한 용해 작용으로 공극이 커지면서 토양 표면에서 침식된 할로이사이트 입자들이 하강하는 빗물과 함께 단면 하부로 부유 운반되어 치밀한 집합체와 사장석 해정 위에 성긴 집합체로 퇴적되었다. 층간수산화물 스멕타이트는 풍화 초기에 용액의 출입과 이온의 용탈이 제한된 좁은 사장석 열극에서 Si이 비교적 풍부한 용액에서 침전되었으며, 사장석의 계속된 용해작용으로 공극이 커지고 이동성이 큰 이온들이 제거되면서 전 단면에 걸쳐 할로이사이트가 활발하게 생성되었다. 할로이사이트는 젊은 풍화 단면에서 캐올리나이트 생성에 앞서 반응 속도론적으로 준안정한 광물로서 침전된 것으로 추정된다.

Keywords

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