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NTIS 바로가기자원환경지질 = Economic and environmental geology, v.51 no.4, 2018년, pp.323 - 343
박채원 (연세대학교 지구시스템과학과) , 김하 (연세대학교 지구시스템과학과) , 송윤구 (연세대학교 지구시스템과학과)
This study defines the mineralogical, micro-textural and geochemical characteristics for the carbonate rocks and discusses the fluids that have affected the depositional environment of the Lower Makgol Formation in Seokgaejae section. Based on analysis of X-ray Diffraction (XRD), Scanning Electron M...
핵심어 | 질문 | 논문에서 추출한 답변 |
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하부 오르도비스기 막골층이란 무엇인가? | 하부 오르도비스기 막골층은 한반도 중동부의 대규모 탄산염암-쇄설성 규산염암 복합체(mixed carbonatesiliciclastic sequence)가 분포하는 캠브리아기-오르도비스기(Cambrian-Ordovician) 조선누층군의 태백층군에 속하며(Kobayashi, 1966; Cheong, 1969; Choi, 1998; Fig. 1a), 주로 천해성의 탄산염암(shallow water carbonates sequence)으로 구성되어 있다(Paik, 1987; Woo, 1999; Choi et al., 2004). | |
탄산염암의 어떤 특성이 존재하는가? | 탄산염암은 천해 탄산염암 대지(carbonate platform)에서 퇴적될 때 수 m 또는 수십 m 규모의 연속적인 상향천해화(shallowing-upward successions)를 이루며 퇴적되는데, 일부 구간에서 돌로마이트가 우세한 암상 또는 부분적으로 돌로마이트화된 암상이 반복적으로 퇴적되는 특성이 존재한다(Fischer, 1975; Hoffman, 1975; Wright, 1984; Goodwin et al., 1986; Anderson and Goodwin, 1990; Pratt et al. | |
Type1과 Type2의 돌로마이트 결정은 상대적으로 높은 Mg/Ca ratio와 평평한 기울기의 REE패턴, 낮은 또는 보통 이하의 Fe 함량, 낮은 Mn 함량의 특성을 가지는데 이러한 이유는 무엇인가? | Type 1과 Type 2의 돌로마이트 결정은 상대적으로 높은 Mg/Ca ratio와 평평한 기울기의 REE 패턴, 낮은 또는 보통 이하의 Fe 함량, 낮은 Mn 함량의 특성을 가진다. 이는 고염수로부터의 지속적인 Mg 유입이 돌로마이트 형성에 영향을 주었음을 지시한다. 방해석 결정에서 Type 1은 LREE가 부화된 REE 패턴을 가지는 반면, Type 2는 평평한 기울기의 패턴을 가지며 이는 막골층 하부 Type 3와 Type 4 방해석 결정의 REE 패턴 및 총 REE 함량과 유사한 특성을 갖는다. |
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