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이 연구에서는 동해 울릉분지 천부 가스의 지화학적 특징, 지역적 및 수직적 분포 특성과 기원을 규명하기 위해 천부 퇴적물에서 채취한 공기층 가스 (headspace gas)를 이용하여 성분 분석과 메탄가스 내 탄소 안정동위 원소 분석을 실시하였다. 가스 분석 결과, 천부가스 대부분이 메탄으로 구성되어 있으며 심도에 따른 수직적인 변화와 시료 채취 지역에 따른 지역적인 변화가 인지되었다. 울릉분지 북부지역에서 채취한 시료들의 공기층 가스 내 메탄 함유량은 900 ppm 이하이고 심도에 따른 변화가 관찰되지 않았지만 남부지역에서는 SMI (sulfate-methane interface) 심도 하부에서 메탄의 함유량이 급격히 증가하여 메탄의 최대 함유량이 42,000 ppm에 달한다. 이는 울릉분지 남부지역이 북부지역보다 메탄 함유량이 높다는 것을 지시한다. 그러나 메탄가스 내 탄소 안정동위원소 분석결과는 울릉분지 남부지역과 북부지역 사이에서 메탄가스의 기원 차이가 관찰되지 않았다. 탄소 안정동위 원소 비는 -94.8 ‰에서 -69.5 ‰의 범위를 가지고 있으며, 이와 같은 분석 결과는 울릉분지 내 천부가스의 메탄이 열 기원보다는 이산화탄소 환원작용에 의한 생물 기원임을 지시한다. 또한 울릉분지 남부지역에서 채취한 시료들의 메탄가스 내 탄소 안정동위원소 비는 SMI 심도부근에서 전형적인 무산소 메탄산화작용 (AMO)의 특징을 보여준다.
Gas composition and carbon isotopic analyses of methane in the headsapce gas were carried out to identify the sallow gas characteristics, their spatial and vertical variation and origin in Upper Quaternary sediments from Ulleung Basin of the East Sea. Based on the gas composition analysis, hydrocabon gases in the headsapce gas predominantly consist of methane and they show the vertical and spatial variation according to the sampling location. Methane contents of the headspace gases in the northern part of Ulleung Basin are lower than 900 ppm and have relatively constant value with depth whereas they rapidly increase below the sulfate-methane interface (SMI) in the southern part of Ulleung Basin and then their content reaches 42,000 ppm. These results imply that methane content in the sediment has higher in the southern part of Ulleung Basin than in the northern part. However, methane in the both parts of Ulleung Basin have the same origin. The analyzed δ13CCH4 values in the study cores ranged from -94.8 ‰ to -69.5 ‰, irrespective of sampling location. This indicates that the methane should have been dominantly originated from biogenic rather than thermogenic source through the CO2 reduction process. Also, the δ13CCH4 in the southern part of Ulleung Basin shows the typical characteristics when the anaerobic methane oxidation (AMO) occurs around the SMI.
Gas composition and carbon isotopic analyses of methane in the headsapce gas were carried out to identify the sallow gas characteristics, their spatial and vertical variation and origin in Upper Quaternary sediments from Ulleung Basin of the East Sea. Based on the gas composition analysis, hydrocabon gases in the headsapce gas predominantly consist of methane and they show the vertical and spatial variation according to the sampling location. Methane contents of the headspace gases in the northern part of Ulleung Basin are lower than 900 ppm and have relatively constant value with depth whereas they rapidly increase below the sulfate-methane interface (SMI) in the southern part of Ulleung Basin and then their content reaches 42,000 ppm. These results imply that methane content in the sediment has higher in the southern part of Ulleung Basin than in the northern part. However, methane in the both parts of Ulleung Basin have the same origin. The analyzed δ13CCH4 values in the study cores ranged from -94.8 ‰ to -69.5 ‰, irrespective of sampling location. This indicates that the methane should have been dominantly originated from biogenic rather than thermogenic source through the CO2 reduction process. Also, the δ13CCH4 in the southern part of Ulleung Basin shows the typical characteristics when the anaerobic methane oxidation (AMO) occurs around the SMI.
권호기사
참고문헌 (33건) : 자료제공( 네이버학술정보 )
| 번호 | 참고문헌 | 국회도서관 소장유무 |
|---|---|---|
| 1 | Geological and Geochemical Studies on the Late Quaternary Sedimentary Environment of the Southwestern Ulleung Basin, East Sea. | 소장 |
| 2 | Origin of Organic Matter and Geochemical Variation of Upper Quaternary Sediments from the Ulleung Basin | 소장 |
| 3 | Stratigraphical and Sedimentological Studies on Core Sediments from the Southwestern Ulleung Basin, East Sea | 소장 |
| 4 | Sulfate Reduction and Origin of Organic Matter in the Ulleung Basin, East Sea | 소장 |
| 5 | 박명호, 김지훈, 이성숙, 한상근, 길영우, 2006, 동해 남서부 해역의 제4기 후기 퇴적물과 공극수에서의 퇴적학적 및 지화학적 변화의 의미. 한국석유지질학회지, 12, 20-26. | 미소장 |
| 6 | Origins and paleoceanographic significance of laminated muds from the Ulleung Basin, East Sea (Sea of Japan)  |
미소장 |
| 7 | Bahk, J.J., Chough, S.K., Jeong, K.S., Han, S.J., 2001. Sedimentary records of paleoenvironmental changes during the last deglaciation in the Ulleung Interplain Gap, East Sea (Sea of Japan). Global Planetary and Change 28, 241-253. | 미소장 |
| 8 | Bahk, J.J., Kong, G.S., Park, Y., Kim, J. H., Lee, H., Park, Y., Park, K.P., 2007, Preliminary results of near-seafloor gas hydrate occurrence in the Ulleung Basin. Korea- Japan Joint Symposium on Ocean Drilling (abstract), Jeju, November 22-23, 55 p | 미소장 |
| 9 | Carbon cycling within the upper methanogenic zone of continental rise sediments; An example from the methane-rich sediments overlying the Blake Ridge gas hydrate deposits |
미소장 |
| 10 | Global and local variations of interstitial sulfate gradients in deep-water, continental margin sediments: Sensitivity to underlying methane and gas hydrates |
미소장 |
| 11 | Chough, S.K., Lee, H.J., Yoon, S.H., 2000, Marine geology of Korean seas, 2nd edition. Elsevier, Amsterdam, 313 p. | 미소장 |
| 12 | Claypool, G.E., Kaplan, I.R., 1974, The origin and distribution of methane in sediments. In: Kaplan, I.R. (ed.), Natural Gases in Marine Sediments. Plenum, New York, 99-139. | 미소장 |
| 13 | Gorbarenko, S.A., 1983, Paleogeographic conditions in the central part of the Sea of Japan during Holocene and late Pliestocene time on the base of 18O/16O ratios in foraminiferal tests. Oceanology, 23, 224-227. | 미소장 |
| 14 | KIGAM, 2003, Study on techniques for the gas hydrate exploration and development. Annual Report. KR- 03(C)-09, Korea Institute of Geoscience and Mineral Resources. Daejeon, 263 p. | 미소장 |
| 15 | KIGAM, 2004, Study on techniques for the gas hydrate exploration and development. Annual Report KR- 04(C)- 09, Korea Institute of Geoscience and Mineral Resources. Daejeon, 525 p. | 미소장 |
| 16 | KIGAM, 2005, Studies on Gas Hydrates Development Technology. Annual Report KR-05-032, Korea Institute of Geoscience and Mineral Resources. Daejeon, 552 p. | 미소장 |
| 17 | Tephrostratigraphy and paleoenvironmental variation in late Quaternary core sediments of the southwestern Ulleung Basin, East Sea (Sea of Japan) |
미소장 |
| 18 | Kim, J.H., 2007, Geochemical characteristics of organic matter, pore waters and methane gas of Upper Quaternary sediments from the Ulleung Basin, East Sea. Ph. D. thesis, Seoul National University, Seoul, 191 p. | 미소장 |
| 19 | Geochemical characterization of the organic matter, pore water constituents and shallow methane gas in the eastern part of the Ulleung Basin, East Sea (Japan Sea) |
미소장 |
| 20 | Paleoceanographic change during the last deglaciation, East Sea of Korea (Paper 1999PA000393) |
미소장 |
| 21 | Slope-stability change from late Pleistocene to Holocene in the Ulleung Basin, East Sea (Japan Sea) |
미소장 |
| 22 | Distribution and origin of shallow gas in deep-sea sediments of the Ulleung Basin, East Sea (Sea of Japan) |
미소장 |
| 23 | Lee, S.H., Bahk, J.J., Chough, S.K., Back, G..G., Yoo, H.S. 2004, Late Quaternary sedimentation in the Ulleung Interplain Gap, East Sea (Korea). Marine Geology, 206, 225-248. | 미소장 |
| 24 | Oba, T., Kitazato, H., 1980, Analysis of paleoenvironmetna since the last glacial age based on two cores from the Japan Sea. Archeology and National Science. 13 31-49 (in Japanese with English abstract). | 미소장 |
| 25 | Framboidal pyrites in late Quaternary core sediments of the East Sea and their paleoenvironmental implications | 소장 |
| 26 | Tephrostratigraphy and paleo-environmental implications of Late Quaternary sediments and interstitial water in the western Ulleung Basin, East/Japan Sea |
미소장 |
| 27 | AMS radiocarbon dating of the marine late Pleistocene–Holocene sediment cores from the western Ulleung Basin, East/Japan Sea |
미소장 |
| 28 | Park, M.H., Kim, J.H., Kil, Y.W., 2007, Identification of the late Quaternary tephra layers in the Ulleung Basin of the East Sea using geochemical and statistical methods. Marine Geology, 244, 196-208. | 미소장 |
| 29 | Pimmel, A., Claypool, G., 2001, Introduction to shipboard organic geochemistry on the JOIDES Resolution. ODP Technical Note 30, 29 p. | 미소장 |
| 30 | Carbon isotopic distribution of methane in deep-sea hydrothermal plume, Myojin Knoll Caldera, Izu-Bonin arc: implications for microbial methane oxidation in the oceans and applications to heat flux estimation |
미소장 |
| 31 | Carbon isotopic evidence of methane oxidation through sulfate reduction in sediment beneath cold seep vents on the seafloor at Nankai Trough |
미소장 |
| 32 | Carbon and hydrogen isotope systematics of bacterial formation and oxidation of methane |
미소장 |
| 33 | Biogenic methane formation in marine and freshwater environments: CO 2 reduction vs. acetate fermentation—Isotope evidence |
미소장 |
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