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Analyses of mineral composition and grain size of the sandstones from the Daedong group
Kang Min Yu(兪剛民) 대한자원환경지질학회 1985 자원환경지질 Vol.18 No.3
초기 쥬라기 大同層群의 砂岩을 대상으로 鑛物成分分析과 粒度分析을 堆積物 供給地와 堆積環境을 유추하기 위하여 大同層群의 분포지인 聞慶, 大川, 金浦, 漣川 地域에 대해 실시하였다. 砂岩의 鑛物 및 粒度分析은 聞慶地域을 중점적으로 하여 大川, 金浦, 漣川地域의 일차적 결과를 첨부하였다. 硏究地域의 砂岩은 59.8~87.2%의 높은 함량의 石英을 포함하는 특징이 있다. 石英 중 많은 수가 風成層에서 생성되어지는 원마도가 좋은 dust ring을 나타낸다. 長石은 극히 드물게 함유되어 있다. 허나 大川地域의 砂岩은 타지역보다 높은 수치인 1.8~10.0%를 함유하고 있다. 硏究地域의 砂岩의 특성으로부더 大同層群의 供給地는 石英質砂岩 내지 硅岩이었을 가능성이 매우 높다. 砂岩은 quartz 내지 quartzose arenite 및 wacke로 분류되며 단, 大川의 砂岩은 quartzose 내지 lithic arenite 및 wacke로 분류된다. C-M과 sorting-skewness 그림표의 결과는 河川性環境을, 누적곡선의 양상은 湖水性環境을 시사하고 있어 堆積環境에 관한 타증거가 필요하다. Mineral composition and grain size analyses of the sandstone from the Early Jurassic Daedong Group distributed in Mungyeong, Daecheon, Kimpo and Yeoncheon areas were made for the study of provenances and depositional environments. The most of the analyses are obtained from Mungyeong area, with some preliminarly works from Daecheon, Kimpo and Yeoncheon areas. All sandstones from the study area are characterized by high content of quartz ranging from 59.8 to 87.2 percent of total constituents. Many of quartz which has rounded dust ring seems to come from aeolian sediments. Content of feldspar is very low except Daecheon area where it ranges from 1.8 to 10.0 percent. Sandstones from Mungyeong, Kimpo and Yeoncheon areas are classified as quartz and quartzose arenite/wacke, while those from Daecheon area are classified as quartzose and lithic arenite/wacke. According to the character of the sandstones, provenance could be quartzose sandstone and quartzite. Results of grain size analysis of C-M and sorting versus skewness suggest that depositional environment seems to be fluvial, while log-probability curve pattern lacustrine environment. It is hard to derive a definite conclusion of sedimentary environment by the grain size analysis.
Ok Joon Kim(金玉準),Kang Min Yu(兪剛民) 대한자원환경지질학회 1977 자원환경지질 Vol.10 No.1
The study area is located in between Hacheonri and Weolgulri, Jecheon-gun where the formations of Okcheon group and Chosun group come in contact and the stratigraphy and geological age of the Okcheon group have been debated among previous workers. The dolomitic limestone which distributed at Cheongam and Dumusil is clarified as the Hyangsanri dolomite formation and the quartzite distributed at Cheongam and Howeunri as Taehyangsan quartzite formation. The newly named Soorumsan schist interbedded in the Great Limestone Series was previously classified Seochangri formation. It is also classified that the formation formerly named as Seochangri was divided into newly named Manji schist which seems to be correlated to Kemyeongsan and Munjuri formation. The formation formerly named as Buknori is clarified as Hwanggangri formation. The Samtaesan formation has been clarified as the lower and upper limestone beds which belong to the Great Limestone Series. The area divided into two groups, that is, Okcheon system of Pre-cambrian age occupies western part and the Great Limestone Series of Chosun system of Cambro-Ordovician age eastern part of this area. Okcheon system consists in ascending order of Manji schist, Hyangsanri dolomite, Taehyangsan quartzite, Munjuri schist, and Hwanggangri formation of meta-tillite. The Great Limestone Series of Chosun group consists in ascending order of lower limestone, Soorumsan schist, Hoosanri quartzite and upper limestone formations. Busan augen gneiss seems to be igneous origin. Unmetamorphosed shale interbed can be traced in the Soorumsan schist. Previous study (Kims, 1974) reveals that meta-volcanic rocks are distributed from south to north alone contact zone of the Okcheon and Chosun groups, and it has been confirmed that the meta-volcanics crop out continuously from the adjacent southern quardrangle into the southern part of the area studied, intruding along the fault zone between the Okcheon and Chosun groups which seems to be upthrust as in the area south. This evidence coincides with Kims’ work (1974) which states that the Precambrian Okcheon group is largely overturned and thrusted over the Chosun group.