[논문]장군 연-아연 광상의 모암변질대내 탄산염 광물의 산상 및 화학조성

유봉철

doi:10.22807/kjmp.2023.36.3.167

장군 연-아연 광상의 모암변질대내 탄산염 광물의 산상 및 화학조성
Occurrence and Chemical Composition of Carbonate Mineral from Wallrock Alteration Zone of Janggun Pb-Zn Deposit 원문보기

광물과 암석 = Korean journal of mineralogy and petrology, v.36 no.3, 2023년, pp.167 - 183

초록
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장군 연-아연 광상은 망간 광체, 연-아연 광체 및 철 광체로 구성된다. 이 망간 광체는 생성환경 및 광물 조합을 토대로 탄산망간 광체와 산화망간 광체로 구성된다. 이 광상 지질은 선캠브리아기의 원남층, 율리층군, 캠브리안기내지 오도비스기의 장산규암층, 두음리층, 장군석회암층, 석탄기내지 이엽기의 동수곡층, 재산층, 쥐라기의 동화지층 및 이들을 관입한 중생대의 춘양화강암류로 구성된다. 이 탄산망간 광체는 고생대 캠브리안기내지 오도비스기의 장군석회암층에 연-아연 열수용액과 반응에 의해 형성된 열수교대형 광체이다. 이 열수교대형 광체의 연-아연 광화작용과 관련된 모암변질작용은 주로 능망간석화작용과 일부 돌로마이트화작용, 황철석화작용, 견운모화작용 및 녹니석화작용 등이 관찰된다. 정출순서에 따른 모암변질작용 시 형성된 탄산염 광물은 Ca-돌로마이트(Co형, 모암) → 철백운석과 Ferroan 철백운석(C1형, 초기) → 철백운석(C2형) → 시데로플레사이트(C3형) → 시데로플레사이트 및 피스토메사이트(C4형, 후기)가 형성되어 Fe와 Mn 원소들이 부화되는 방향으로 진행되었다. 따라서 정출순서에 따른 모암변질작용 시 형성된 모암인 돌로마이트질 대리암(Mg, Ca 기원)과 연-아연 열수용액(Fe, Mn 기원)과 원소들의 치환관계를 살펴보면 다음과 같다. 1)초기 백운석 및 Ferroan 철백운석(C1형)은 Fe ↔ Mn 및 Mn ↔ Mg, Ca, Fe 원소들간 치환에 의해 형성, 2)철백운석(C2형)은 Fe ↔ Mn, Mn ↔ Mg, Ca 및 Mg ↔ Ca 원소들간 치환에 의해 형성, 3)시데로플레사이트(C3형)은 Fe ↔ Mn, Fe ↔ Ca 및 Mn ↔ Mg, Ca 원소들간 치환에 의해 형성과 4)후기 시데로플레사이트와 피스토메사이트(C4형)은 Fe ↔ Mg, Fe ↔ Mn 및 Mn ↔ Mg, Ca 원소들간 치환에 의해 형성되었다.

Abstract ▼ AI-Helper

The Janggun Pb-Zn deposit consists of Mn orebody, Pb-Zn orebody and Fe orebody. The Mn orebody composed of manganese carbonate orebody and manganese oxide orebody on the basis of their mineralogy and genesis. The geology of this deposit consists of Precambrian Weonnam formation, Yulri group, Paleozoic Jangsan formation, Dueumri formation, Janggum limestone formation, Dongsugok formation, Jaesan formation and Mesozoic Dongwhachi formation and Chungyang granite. This manganese carbonate orebody is hydrothermal replacement orebody formed by reaction of lead and zinc-bearing hydrothermal fluid and Paleozoic Janggum limestone formation. The wallrock alteration that is remarkably recognized with Pb-Zn mineralization at this hydrothermal replacement orebody consists of mainly rhodochrositization with minor of dolomitization, pyritization, sericitization and chloritization. Carbonates formed during wallrock alteration on the basis of paragenetic sequence are as followed : Ca-dolomite (Co type, wallrock) → ankerite and Ferroan ankerite (C1 type, early stage) → ankerite (C2 type) → sideroplesite (C3 type) → sideroplesite and pistomesite (C4 type, late stage). This means that Fe and Mn elements were enriched during evolution of hydrothermal fluid. Therefore, The substitution of elements during wallrock alteration beween dolomitic marble (Mg, Ca) and lead and zinc-bearing hydrothermal fluid (Fe, Mn) with paragenetic sequence is as followed : 1)Fe ↔ Mn and Mn ↔ Mg, Ca, Fe elements substitution (ankerite and Ferroan ankerite, C1 type, early stage), 2)Fe ↔ Mn, Mn ↔ Mg, Ca and Mg ↔ Ca elements substitution (ankerite, C2 type), 3)Fe ↔ Mn, Fe ↔ Ca and Mn ↔ Mg, Ca elements substitution (sideroplesite, C3 type), and 4)Fe ↔ Mg, Fe ↔ Mn and Mn ↔ Mg, Ca elements substitution (sideroplesite and pistomesite, C4 type, late stage)

주제어

표/그림 (12)

그림 Fig. 1. Geological map of the Janggun Pb-Zn deposit (Modified after Lee et al., 1990; Yoo, 2012; 2022).
그림 Fig. 2. Underground geological map in the main adit (591 m level) of the Janggun Pb-Zn deposit (Modified after Lee et al., 1990). Red circles and numbers indicate sample locations and sample numbers (28 and 27 = wallrock; 7, 105, 20 and 2 = wallrock alteration; 21 = wallrock alteration and Pb-Zn ore vein and 120 = Pb-Zn ore vein, respectively).
그림 Fig. 3. Photograph of rock slab sample with Pb-Zn ore vein, wallrock alteration and wallrock from the Janggun Pb-Zn deposit (Modified after Yoo, 2012; 2022).
$Fig. 4. BSEs of carbonate crystals showing different phases and paragenetic texture. (a)-(b) dark carbonate (Co type) replaced or sealed fractures by intermediate and white carbonate (C1 type and C3 type) coexisting with white mica, sphalerite and galena, (c) dark and intermediate carbonate (Co type and C1 type) coexisting with white mica replaced by white carbonate (C2 type), (d) dark and intermediate carbonate (Co type and C1 type) coexisting with white mica replaced by white carbonate (C3 type) coexisting with pyrite, which also replaced by white carbonate (C4 type), (e) dark carbonate (Co type) replaced by white carbonate (C1 type), which also replaced or sealed fractures by white carbonate (C2 type) coexisting with sphalerite and galena, (f) white carbonate (C3 type) replaced or sealed fractures by intermediate carbonate (C4 type) coexisting with galena, (g) intermediate carbonate (C1 type) coexisting with white mica replaced by white carbonate (C3 type) coexisting with pyrite, which also replaced by white carbonate (C4 type), (h) carbonate crystal (D3 type) with dark, intermediate and white phases coexisting with white mica and galena. Abbreviations; Gn = galena, Py = pyrite, Qz = quartz, Sp = sphalerite, WM = white mica. Red circles indicate quantitative analysis points.$ 그림 Fig. 4. BSEs of carbonate crystals showing different phases and paragenetic texture. (a)-(b) dark carbonate (Co type) replaced or sealed fractures by intermediate and white carbonate (C1 type and C3 type) coexisting with white mica, sphalerite and galena, (c) dark and intermediate carbonate (Co type and C1 type) coexisting with white mica replaced by white carbonate (C2 type), (d) dark and intermediate carbonate (Co type and C1 type) coexisting with white mica replaced by white carbonate (C3 type) coexisting with pyrite, which also replaced by white carbonate (C4 type), (e) dark carbonate (Co type) replaced by white carbonate (C1 type), which also replaced or sealed fractures by white carbonate (C2 type) coexisting with sphalerite and galena, (f) white carbonate (C3 type) replaced or sealed fractures by intermediate carbonate (C4 type) coexisting with galena, (g) intermediate carbonate (C1 type) coexisting with white mica replaced by white carbonate (C3 type) coexisting with pyrite, which also replaced by white carbonate (C4 type), (h) carbonate crystal (D3 type) with dark, intermediate and white phases coexisting with white mica and galena. Abbreviations; Gn = galena, Py = pyrite, Qz = quartz, Sp = sphalerite, WM = white mica. Red circles indicate quantitative analysis points.
표 Table 1. Chemical composition of carbonates from the Janggun Pb-Zn deposit
표 Table 1. Continued
표 Table 1. Continued
표 Table 1. Continued
표 Table 1. Continued
표 Table 1. Continued
그림 Fig. 5. Ternary plots of carbonate compositions calculated from EPMA analyses with paragenetic sequence in alteration zone samples from the Janggun Pb-Zn deposit (Modified after Reinhold, 1998 and Biondi et al., 2013). Also is shown the carbonate data by Lee (1985). Arrows indicate the evolution direction of wallrock alteration.
그림 Fig. 6. Binary plots of carbonate compositions from EPMA analyses with paragenetic sequence in alteration zone samples from the Janggun Pb-Zn deposit.

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상세보기
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상세보기
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