[논문]용유도 을왕산 자연기원 불소의 부화기작 규명: 단층대 연구를 중심으로

이종환; 전지훈; 이승현; 김순오

doi:10.22807/kjmp.2022.35.3.377

[국내논문] 용유도 을왕산 자연기원 불소의 부화기작 규명: 단층대 연구를 중심으로
Elucidation of the Enrichment Mechanism of the Naturally Originating Fluorine Within the Eulwangsan, Yongyudo: Focusing on the Study of the Fault zone 원문보기

광물과 암석 = Korean journal of mineralogy and petrology, v.35 no.3, 2022년, pp.377 - 386

이종환 (경상국립대학교 자연과학대학 지질과학과 및 기초과학연구소) , 전지훈 (경상국립대학교 자연과학대학 지질과학과 및 기초과학연구소) , 이승현 (경상국립대학교 자연과학대학 지질과학과 및 기초과학연구소) , 김순오 (경상국립대학교 자연과학대학 지질과학과 및 기초과학연구소)

초록
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불소는 인위적 기원 외에 마그마 분화작용, 열수변질작용, 광화작용, 단층 활동과 같은 지질학적 기원에 의해 자연적으로 암석 내 부화될 수 있다. 일반적으로 화성암 및 변성암이 분포하는 지역에서 고농도의 불소가 산출되는 것으로 알려져 있으며, 연구지역은 흑운모화강암이 주로 분포하는 지역이다. 그러나 선행연구에서 자연기원 불소의 부화기작에 대한 규명이 부족했고 이를 보다 명확히 규명하기 위해 단층대에 대한 연구를 수행하였다. 을왕산 흑운모화강암과 단층대 암석의 구성 광물은 동일하지만 정량적인 차이가 나타난다. 석영과 불소함유광물(형석, 견운모 등)은 높은 함량으로 존재하며, 사장석과 알칼리장석은 낮은 함량으로 존재한다. 이러한 차이는 열수에 의한 광물의 변질작용 때문인 것으로 판단된다. 현미경 관찰 결과 또한 열수에 의한 불소함유광물의 생성이 대부분의 시료에서 관찰된다. 따라서 용유도 등지에 넓게 분포하는 동일한 연령의 흑운모화강암의 암석·광물학적인 차이는 소규모 지질학적 사건에 의한 열수변질작용에 의한 것으로 해석할 수 있다.

Abstract ▼ AI-Helper

In addition to anthropogenic origins, fluorine (F) is naturally enriched in rocks due to geological events, such as magma dissemination, hydrothermal alteration, mineralization, and fault activities. Generally, it has been well known that F is chiefly enriched in the region of igneous and metamorphic rocks, and biotite granite was mostly distributed in the study area. The F enrichment mechanism was not sufficiently elucidated in the previous studies, and the study on a fault zone was conducted to reveal it more precisely. The mineral composition of the fault zone was identical to that of the Eulwangsan biotite granite (EBG), but they were quantitatively different between the two areas. Compared with the EBG, the fault zone showed relatively higher contents of quartz and F-bearing minerals (fluorite, sericite) but lower contents of plagioclase and alkali feldspar. This difference was likely due to hydrothermal mineral alterations. The results of microscopic observations supported this, and the generation of F-bearing minerals by hydrothermal alterations was recognized in most samples. Accordingly, it might be interpreted that the mineralogical and petrological differences observed in the same-age biotite granite widely distributed in the Yongyudo was caused by the hydrothermal alterations due to small-scale geological events.

Keyword

표/그림 (8)

그림 Fig. 1. Location (a) and geological map (b) of the study area (modified from Cho and Lee, 2017; Lee et al., 2019).
그림 Fig. 2. (a) Aerial view of the Eulwangsan area and the white box designates the location of fault zone shown in (b); (b) the fault zone located in the Eulwangsan area; (c) the outcrop of fault zone exposed on a slope nearby F1; (d) the core (center) of F2.
표 Table 1. Standard samples and detection limits of each element for the analyses of electron probe micro-analyzer (EPMA)
표 Table 2. The average fluorine concentrations of X-ray fluorescence spectrometer (XRF) for the rocks of the Eulwangsan fault zone
$Fig. 3. The analytical results of X-ray diffractometer (XRD) for the rocks obtained from the Eulwangsan fault zone. (a) the analytical results show the peaks of quartz, plagioclase, alkali feldspar, biotite, chlorite, and sericite; (b) the fluorite peaks overlapped with those of alkali feldspar. Samples containing fluorite showed its shoulder, but they without fluorite did not.$ 그림 Fig. 3. The analytical results of X-ray diffractometer (XRD) for the rocks obtained from the Eulwangsan fault zone. (a) the analytical results show the peaks of quartz, plagioclase, alkali feldspar, biotite, chlorite, and sericite; (b) the fluorite peaks overlapped with those of alkali feldspar. Samples containing fluorite showed its shoulder, but they without fluorite did not.
$Table 3. The analytical results of quantitative X-ray diffractometer (XRD) for the rocks of the Eulwangsan fault zone (%)$ 표 Table 3. The analytical results of quantitative X-ray diffractometer (XRD) for the rocks of the Eulwangsan fault zone (%)
그림 Fig. 4. The observation results of polarized microscope for the rocks obtained from the Eulwangsan fault zone. (a, b) biotite and chlorite filling pore spaces between sericite generated due to the alteration of plagioclase and alkali feldspar and other minerals (sample F005); (c, d) veinlet-type fluorite accompanying with quartz and filling the pore spaces between minerals (sample F040). Qz=quartz; Pl=plagioclase; Kfs=K-feldspar; Ser=sericite; Bt=biotite; Chl=chlorite; Fl=fluorite.
표 Table 4. The average fluorine concentrations of electron probe micro-analyzer (EPMA) for the F-bearing minerals of the Eulwangsan fault zone (wt%)

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