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의성소익지(義城小益地) 신동층군(新洞層群)의 퇴적암석학(堆積岩石學) 및 퇴적환경(堆積環境)
이광춘,Lee, Kwang-Choon 대한자원환경지질학회 1985 자원환경지질 Vol.18 No.3
Sedimentary petrology and depositional environments of the Sindong Group, consisting of in ascending order the Nagdong, Hasandong and Jinju Formations, in the Euiseong Subbasin are studied. For these, the Sindong sequence over 1,000m thick is measured at the scale of 1:200 and 36 thin sections of sandstones of the Hasandong Formation are studied under the polarizing microscope. In addition, published paleontologic data are incorporated in the sedimentologic interpretation. Most of the sandstones are classified as arkose. They are moderately sorted, near symmetrical to fine skewed and mesokurtic. Relationship between the textural parameters suggests a fluviatile environment of the Hasandong Formation. The Sindong fauna and flora also indicate non-marine depositional environments. Sedimentologic data of the measured sections show that the Sindong Group is made up of from the bottom an alluvial fan (lower part of the Nagdong Formation), a fluvial plain (upper part of the Nagdong Formation and the Hasandong Formation) and a fluvial/lacustrine (the Jinju Formation) deposits.
慶尙北道 軍威 地域 上部 晋州層産 湖成 圓柱形 스트로마톨라이트와 古環境
李光春(Kwang Choon Lee) 상지대학교 환경과학기술연구소 1997 환경과학연구 Vol.3 No.1
경상북도 군위 지역에 분포하는 백악기 호변상 퇴적층으로 알려진 상부 진주층 내에서는 원주형 스트로마톨라이트, 우이드 등의 탄산염암과 석고 정벽들이 산출된다. 원주형 스트로마톨라이트는 직경 24 ㎝ 길이 100 ㎝인 것과 직경 10 ㎝, 길이 120 ㎝에 이르는 것들을 비롯하여 다양한 크기와 표면 구조를 갖는다. 이러한 원주형 스트로마톨라이트는 나무줄기가 물 속에 잠겨 있는 동안 그 주위에 조식물이 부착ㆍ성장하면서 형성된 것으로 판단된다. 성장의 중심(핵)이 되었던 나무줄기 부분은 부패되어 없어져서 비어 있거나, 쇄설성 퇴적물 아니면 침전된 교결물로, 또는 이들의 혼합물로 충전되어 있다. 파상이나 평탄한 엽층리 조직이 잘 발달되어 있으며 작은 기둥이나 돔들이 발달되는 경우도 있다. 흑색 셰일층 내에서 산출되는 석고 정벽들은 주형과 반양추형의 단결정, 제비꼬리형 쌍정, 반양추형 다결정체, 평원반형 다결정체들이다. 탄산염암과 석고 정벽의 연구에 의하면 진주층은 주로 온난하고 우기와 건기가 자주 반복되는 고기후였으며 염호 환경하에서 퇴적된 것으로 판단된다. The Cretaceous Chinju Formation distributed in Kunwi area, Kyongsangbukdo, is a lacustrine deposit. Cylindrical stromatolites, ooids and gypsum habits are found in the Upper Chinju Formation known as marginal-lacustrine facies. The stromatolites of the study area are cylindrical types that are very variable in diameter, length and surface ornament. Algae grew on tree branches submerged in the lake and growth of the stromatolite began below the water surface on the branches. The branch decayed leaving a branch mould, which might be passively filled with detrital sediments and precipitated cements. The diameters of the cylinders range from several centimeters to several tens centimeters, the longest recorded in this study being 24 ㎝ long, and the lengths of the cylindrical stromatolites are from several centimeters up to 120 ㎝ long, e.g., 24×100 ㎝ and 10×12.0 cm (diameter×length). Also surface ornaments are variable; smooth to knobby. The cylindrical stromatolites have smooth, wavy and columnar/domal laminae. Gypsum habits from black shale are prismatic and hemi-bipyramidal single crystals, hemi-bipyramidal and swallow-tailed twins, hemi-bipyramidal aggregates, and disc-shaped aggregates(rosettes). According to the study of carbonate rocks and gypsum habits, the Chinju Formation formed under saline lake environments and paleoclimatic fluctuations from rainy to arid.
Kwang Choon Lee(李光春) 대한자원환경지질학회 1985 자원환경지질 Vol.18 No.3
Sedimentary petrology and depositional environments of the Sindong Group, consisting of in ascending order the Nagdong, Hasandong and Jinju Formations, in the Euiseong Subbasin are studied. For these, the Sindong sequence over 1,000m thick is measured at the scale of 1:200 and 36 thin sections of sandstones of the Hasandong Formation are studied under the polarizing microscope. In addition, published paleontologic data are incorporated in the sedimentologic interpretation. Most of the sandstones are classified as arkose. They are moderately sorted, near symmetrical to fine skewed and mesokurtic. Relationship between the textural parameters suggests a fluviatile environment of the Hasandong Formation. The Sindong fauna and flora also indicate non-marine depositional environments. Sedimentologic data of the measured sections show that the Sindong Group is made up of from the bottom an alluvial fan (lower part of the Nagdong Formation), a fluvial plain (upper part of the Nagdong Formation and the Hasandong Formation) and a fluvial/lacustrine (the Jinju Formation) deposits.