한반도(韓半島)의 고환경(古環境) : 그 예비적 고찰
저자
발행기관
학술지명
권호사항
발행연도
1993
작성언어
Korean
KDC
370.000
자료형태
학술저널
수록면
137-184(48쪽)
제공처
소장기관
1. Widely distributed Precambrian strata in Korean Peninsula are highly metamorphosed and contain only a few paleoclimatic information, among these are Sangweon Group and Macheonryeong Group. These groups consist of thick limestones which imply the oceanic influence with warm climate during the late Proterozoic Era. The Birangdong Formation which is the upper part of the Sangweon Group and composed of conglomerate, however, had been interpreted as the glacial deposits. The glacial activity prevailed worldwide during this time span, and the glacial influence was reported also in Yangtze region in China.
2. During the Early Paleozoic Era, Aprokgang, Pyeongnam, and Okcheon regions were covered by the epicontinental sea. Fossils from these regions show the close similarity to the Hwangho Trilobite Fauna in China. The faunal assemblage was probably the result of the equatorial warm temperature. The paleogeographic map, reconstructed chiefly by the paleomagnetic data, support the low-latitude position of the Korean Peninsula at this time span.
3. Fossil faunas, such as conodnts, graptolites, and trilobites, indicate that the warm equatorial climate was continued in the Korean Peninsula through the Ordovician time. The faunas are similar to those of North China and North American Midcontinent regions. Thus the epicontinental sea in the peninsula may have been connected to the inland sea of North China, and North China and North American Midcontinent were situated also in low-latitude.
4. Fossil faunas are cosmopolitan during the Silurian. This might be due to the equator-ward migration of the North Atlantic Faunal Region including Europe, previously located in the higher latitude. Both the recently discovered donodont fauna of the Silurian Hoedongri formation and the paleogeographic data suggest that the Korean Peninsula was situated nearly at the same position and contrlled by the similar climatic condition as in the Ordovecian.
5. During the Carboniferous through the Triassic, the Pyeongan Group was deposited in the Korean Peninsula. The lower part of this strata was produced under transgressed marine influence. Following regression of the sea, the inland lakes and sccompanying rivers controlled the depositional system of the upper part of the Pyeongan Group. Hongjeom Formation and the lower part of the Sadong Formation yielded a significant fusulinid fauna. Fusulinid fauna is similar to those of China and Russia, and represents the warm climate. Fossil flora from the overlying strata, such as the upper part of the Sadong and the Gobangsan formations, shows the characteristic of Cathaysian Flora. The flora also represents the warm and humid climate. The composition of sandstones and the paleogeographic position of the peninsula support the interpretation mentioned above.
6. Daedong Group was formed during the Late Triassic to Early Jurassic. During this time, many georaphiclly separated lakes were developed in the peninsula. These lake environments produced an abundant and diverse fossil flora, The flora is composed of abundant Ginkgoales and Podozamites which represent the temperate climate. Paleomagnetic data also indicate that peninsula was located in lower latitude (23-24˚N). The climate of this time span must have been much warmer and more humid than today. The floral assemblage belongs to the Eastern Subprovince of the Dictyophyllum-Clathropteris Province.
7. Upper Jurassic strata in Korea are represented by the Myogog Formation. The compostion of fossil fauna and flora of the formation is similar to those of the Early Cretaceous Nakdong Formation, and the climate of this time must have been similar to that of Early Cretaceous.
8. Fossil plants from the Nakdong Formation, the basal unit of the Gyeongsang Supergroup, is similar, in composition, to the Lower Cretaceous Tetori Flora in Japan. The flora is interpreted as the product of the warm and humid climate prevailed during the Nakdong time. Overlying Hasandong to Chilok formation, however, include poorly fossiliferors arkosic sandstones and red beds, which implies the arid climate. Especially the predominance of Corollina and Ephedripites from the Jinju Formation supports the above interpretation which is warm and arid cimatic condition during this time span. Paleomagnetic data indicate that the Korean Peninsula was situated nearly at the same latitude as the present in 110Ma. The sedimentary, paleontologic, and palemagnetic records of the Silla Group, the upper part of the Gyeongsang Supergroup indicate that the cimate was mostly warm and arid, and Korean Peninsula was located in similar position as today.
9. During the Miocene, the Korean peninsula experienced the alternations of cool and warm climate. Organic isotope data indicates a pulse of subtropical influence at one time span, and it could possibly be the result of the direct influence of warm oceanic currents from the equatorial region at that time. Since the Early Miocene (20 million years ago), Korean peninsula has located approximately the same latitude as today.
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