지질학회지 (Journal of the Geological Society of Korea)

  • 제39권1호
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  • Pages.81-97
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  • 2003
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  • 0435-4036(pISSN)
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  • 2288-7377(eISSN)
대한지질학회 (The Geological Society of Korea)
권호 표지

희토류원소를 이용한 순창지역 섬진강 수계내 하상퇴적물의 기원지 연구

Provenance of the Seomjin River sediments of the Sunchang area based on the rare earth element geochemistry

이승구;양동윤;홍세선;곽재호;오근창
Lee, Seung-Gu;Yang, Dong-Yoon;Hong, Se-Seon;Kwak, Jae- Ho;Oh, Keun-Chang

  • 발행 : 2003.03.31

⟨ 이전 논문 다음 논문 ⟩

초록

하상퇴적물은 주변암석의 풍화, 운반 그리고 퇴적작용에 의해 만들어진 것이다. 그러므로 하상퇴적물의 기원물질 즉 기원암을 밝혀내는 것은 퇴적물의 이동경로를 알아내는데 매우 중요하다고 볼 수 있다. 본 연구에서는 전라북도 순창군 일대의 섬진강 수계내 퇴적물과 주변 암체의 화학조성 특히 희토류원소 분포도를 토대로 하상퇴적물의 근원지를 밝혀내고자 하였다. 조사된 지류는 순창읍을 관통하는 외이천, 옥과읍을 지나가는 옥과천과 곡성군 서봉리에 분포하는 서봉천이다. 주성분조성의 경우, 외이천을 제외하고는 기반암과 하상퇴적물 사이의 상관성이 미약하다. 희토류원소 분포도($La_N$과 $Yb_N$의 비)와 $Eu/Eu^{*}$의 비 즉 Eu의 이상치의 크기를 토대로 하상퇴적물과 주변 암석을 비교하여 본 결과, 주성분 조성에 비해 희토류원소의 분포도는 전반적으로 상호간에 매우 밀접한 상관관계를 보여준다. 특히 옥과천과 서봉천지류에서는 근접한 암체가 아닌 비교적 먼 거리의 암체와 매우 유사한 희토류원소의 분포도를 보여준다. 이는 희토류원소가 하상퇴적물의 기원물질을 밝혀내는 데 매우 유용하다는 것을 말해주는 것이다.

The river sediments are produced by weathering, transportation and deposition. Therefore, it is very important to verify the source material(provenance) in order to know the pathway of the sediments. Here we report the provenance of the river sediments based on the abundance of rare earth elements(REEs) from the river sediments and rocks, which are occurred at the Seomjin river in Sunchang-gun. The branch river studied are Oei and Okgwa streams which pass through Sunchang-eup and Okgwa-eup, respectively, and Seobong stream at Seobong-ri, Gokseong-gun. Major element composition do not show a close relationship between basement rock and river sediment except Oei stream. Based on the chondrite-normalized REEs pattern $(La/Yb)_N$ and $Eu/Eu^{*}$ ratio, we could recognize a close relationship between the river sediments and rocks. Especially, the sediments in the branch river such as Okgwa and Seobong streams show similar REE patterns in the basement rock located at another area. Our results show that the REEs are very useful tool for verifying the provenance of the river sediments.

키워드

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