Post-Last Glacial Sea-Level Change and Time-Averaging appeared from the Molluscan Thanatocoenoses in the Southern Sea of Korea

한국 남해해역 패류군집에서 나타나는 시간평균화 현상과 최종 빙하기 이후 해수면 변동

  • Lee, Yeon-Gyu (Division of Ocean System, College of Fisheries and Ocean Science, Yosu National University)
  • 이연규 (국립여수대학교 수산해양대학 해양시스템학부)
  • Published : 2005.08.01

Abstract

Molluscan shells were sampled from the continental shelf of South Sea: 19 stations in the southeast continental shelf and 5 in the southwest sea, in order to understand characteristics of sea level changes and time-averaging since the last glacial age. Radiocarbon dates were made on 42 dominant and specific species which were sampled from 24 stations. Time-averaging was observed and showed to be 11,939 years in age difference. The sea-level ranged from 150 to 160 m below sea level during the LGM (about 15,000 yrs B.P). The sea-level significantly rose to 60 m at around 9,000 yrs B.P. and became stable at 50 to 60 m between periods between 4,000 and 5,000 yrs B.P. Between 3,000 and 4,000 yrs B.P, the sea-level rapidly rose to a depth of $10\~20m$ below today’s present sea level.

한국 남해해역의 최종빙하기 이후 해수면변화 및 시간평균화 현상을 파악하기 위하여 남동대륙붕 19개 정점, 서남해역 5개 정점에서 산출하는 패류유해 중 우점종 및 특징종 42개체에 대해 $^{14}C$연대측정을 행하였다. 측정결과 동일 정점 내에서 시간평균화(Time-averaging) 현상이 나타나며 최대 11,939년까지 연대차이가 있었다. 그리고 최종빙하기 이후 남해해역에서의 해수면은 약 15,000년 전 최종빙하기시 해수면이 현재 해수면보다 약 $150\~160 m$ 하강하였으며, 이후 약 9,000년까지 해수면이 약 60m로 급격히 상승하였다. 그리고 이후 약 $4,000\~5,000$년까지 수심 약 $50\~60 m$에서 안정적이었으며, $3,000\~4,000$년 사이 또 한번의 급한 해수면 상승으로 수심이 현재 해수면보다$10\~20 m$ 낮아졌으며, 이후 현재에 이르는 것으로 생각된다.

Keywords

References

  1. 과학기술처, 1993, 한국해역 종합해양 자원도 작성 연구-대한해협(2차년도)-. 392 p
  2. 박용안, 최진용, 임동일, 최강원, 이영길, 1995, 한국 서해 남양만 조수퇴적분지의 제4기 퇴적층서와 부정합, 한국해양학회지, 30(4), 332-340
  3. 수로국, 1996, 조류도 (목포항 및 부근), 서지 제630호, 22p
  4. 이연규, 1997, 한국 서남해역 화원반도 주변해역의 패류유해군집 특성. 한국고생물학회지, 13 (1), 1-20
  5. 이연규, 최정민, 김창규. 1999, 벤젠-액체 섬광계수법에 의한 $^{14}C연대측정$. 한국해양학회지(바다). 4 (3), 180-187
  6. 이연규, 최정민, 신현출, 제종길, 2003, 한국남동대륙붕 표층퇴적물에서 산출하는 패류유해군집 특성과 최종빙하기 고환경. 지질학회지, 39 (4), 479-501
  7. 최진용, 박용안, 1993, 한반도 대륙붕 퇴적물의 분포와 조직특성. 한국해양학회지, 28 (4), 259-271
  8. 岡本和夫.北川雅子, 1981, 日本海西南部からの寒冷域を示す貝化石とその$^{14}$C年代. 日本第4 紀學會 講演要旨集 11, 134-135
  9. 波部忠重.小管貞男, 1970, 對馬舟狀海益より得られた貝化石の年代その地史的意義 國立科傳報 3, 75-82
  10. 中村俊夫, 2001, 放財性炭素年代とその高精度化. 第4紀硏究, 40, 445-459
  11. 藤井昭二.有田正史.神嶋利夫.中井信之.中村俊夫.大石昭二, 1991, 三陸沖陸棚から産出した軟體動物遺骸の$^{14}$C年代の意義. 中川久夫敎授退官記念地質學論文集, 31-35
  12. 藤原 治.鎌瀧孝信.增田富士雄, 2000, 前進型外浜堆積物中の貝殼の起源: 千葉縣九十九里浜 月刊地球, 249, 202-205
  13. Bloom, A.L. and Park, Y.A., 1985, Holocene sea-level history and Republic of Korea. The Quaternary Research, 24, 77-84 https://doi.org/10.4116/jaqua.24.77
  14. Brett, C.E. and Baird, G.C., 1986, Comparative Taphonomy: A key to paleoenvironmental interpretation based on preservation. Palaios, 1 (3), 207-227 https://doi.org/10.2307/3514686
  15. Chough, S.K., 1983, Marine Geology of Korean Seas. International Human Resources Development Corporation, p. 157
  16. Emery, K.O., 1969, The continental shelves. Scientific America, 221, 106-122 https://doi.org/10.1038/scientificamerican0969-106
  17. Feng, Y., 1983. Since 40 Ka sea-level change and lowest sea level. East China Sea 1 36-42 (in Chinese)
  18. Flessa K.W. Meldahl, K.H. and Cutler, A.H., 1990, Quantitative estimates of stratigraphic disorder and time-averaging in a shallow marine habit. Geological Society of America. Abstracts with Programs, 22, A83
  19. Fujii, S. and Fuji, Y., 1982. Postglacial sea-level changes in the Hokuriku region, central Japan. The Quaternary Research, 21, 183-193 https://doi.org/10.4116/jaqua.21.183
  20. Fujii, S. and Naruse, Y., 1982. Sea level changes since the late Pleistocene in the Japanese Islands and related problems. The Quaternary Research, 21, 283-287 https://doi.org/10.4116/jaqua.21.283
  21. Fujiwara, O. and Kamataki, T., 2003, Significance of Sedimentological Time-averaging for Estimation of Depositional Age by $^{14}C$ Dating on Molluscan Shells. The Quaternary Research, 42 (1), 41-48 https://doi.org/10.4116/jaqua.42.41
  22. Gorbarenko, S.A., 1983, Paleogeographic conditions in the central part of the of Japan during Holocene and late Pleistocene time on the basis of 18O/16O ratios in foraminiferal tests, Oceanology, 23, 224-227
  23. Kim, J.M., Kennett, J.P., Park, B.K., Kim, D.C., Kim, Y.K. and E.B. Roark, 2000, Paleoceanographic change during the last deglaciation, East Sea of Korea. Paleoceanography, 15 (2), 254-266 https://doi.org/10.1029/1999PA000393
  24. Martin, R.E., 1999, Taphonomy: A Processes Approach, Cambridge University Press, 508p
  25. Park, S.C., Yoo, D.G., Lee, C.W. and Lee, E.I., 2000, Last glacial sea-level changes and paleogeography of the Korea (Tsushima) Strait. Geo-Marine Letters, 20, 64-71 https://doi.org/10.1007/s003670000039
  26. Saito, Y., Wei, H., Zhou, Y., Nishimura, A., Sato, Y. and Yokota, S., 1999, Natural and anthropogenic changes of the Huanghe (Yellow River) delta, China. Saito, Y., Ikehara, K. and Katayama, H. (eds.) Land-Sea link in Asia: 'Prof. Kenneth O.Emery Commemorative International Workshop': 33-38, Proceedings of an international workshop on sediment transport and storage in coastal sea-ocean system. Science Technology Agency of Japan and Geological Survey of Japan
  27. Suk, B.C., 1989, Sedimentology and history of sea level changes in the east China sea and Adjacent seas. Sedimentary facies in the active plate margins. In: Taira, A. and Masuda, F., (eds.), Terra Scientific Publishing Company (Terra Pub.), Tokyo, 215-21
  28. Susan, M.K., Frantz, T.F. and Thomas, A., 1986, Conceptual framework for the analysis and classification of fossil concentrations. Palaios, 1 (3), 228-238 https://doi.org/10.2307/3514687
  29. Swift, D.J.P., Stanley, D.J. and Curray, J.R., 1971, Relict sediments on continental shelves: a reconsideration, Journal Geology, 79, 322-346 https://doi.org/10.1086/627629
  30. Ujiie, H., 1973, Sedimentation of planktonic foraminiferal shells in the Tsushima and Korea Straits between Japan and Korea. Micropaleontology, 19 (4), 444-460 https://doi.org/10.2307/1484907
  31. Saito, Y., Wei, H., Zhou, Y., Nishimura, A., Sato, Y. and Yokota, S., 1999, Natural and anthropogenic changes of the Huanghe (Yellow River) delta, China
  32. Walker, K.R. and Bambach, R.K., 1971, The significance of fossil assemblages from fine-grained sediments: time-averaged communities. Geological Society of America, Abstracts with Programs, 3, 783-784
  33. Xu, S., Ito, S., Iwatsuki, T., Abe, M. and Waqtanabe, M., 2000, A new AMS facility at the JNC Tono Geo-science Center, Japan. Nuclear Instruments and Methods in Physics Research B, 172, 8-12 https://doi.org/10.1016/S0168-583X(00)00379-7