碩士 / 國立臺灣海洋大學 / 海洋環境資訊學系 / 96 / The core MD012404 from Okinawa Trough in this study was reconstructed the sedimentary record of the past 23,000 years. Biomarkers that originate from higher plant wax n-alkanes and C37 alkenones are recognized as proxies of organic matter delivery to Okinawa Trough to interpret terrigenous input changes from East China Sea shelf between interglacial and glacial stage.
The n-alkanes distribution with an odd carbon number predominance indicates a contribution from land source in Okinawa Trough all the time. the distribution of n-alkanes(C31 > C29 > C33 > C27 > C25 ) in Okinawa Trough conforms to the n-alkanes abundance order in East China Sea, we can assume that Okinawa Trough sediment has a terrigenous contribution from East China Sea shelf. In addition, n-alkane distribution shows n-C31 alkane predominance, it reported that high plant wax n-alkanes may originate from grassy vegetation. Based on n-alkane distribution and CPI, diagenesis and bidegradation were strengthened in interglacial stage and weaken in glacial stage, especially maximum in early of the inglacial stage. Acorrding to the ACL varation, higher plant wax n-alkanes distribution were varied by insolation. Through the result of TOC and biomarkers, it developed that organic carbon is chiefly composed of marine organic carbon. The trends of the higher plant wax n-alkanes and C37 alkenones are high in glacial stage and low in inglacial stage, but TOC has no such a clear phenomenon. Comparing with C/N , TOC may be affected by oxygenation -reduction in sedimentary environments. The PCA result reveals:When UK’37SST drops in glacial stage, riased terrigenous input resulted in that marine productivity increased and CaCO3 decreased.
| Identifer | oai:union.ndltd.org:TW/096NTOU5282034 |
| Date | January 2008 |
| Creators | Ssu-En Huang, 黃思恩 |
| Contributors | Hung-Yu Chen, 陳宏瑜 |
| Source Sets | National Digital Library of Theses and Dissertations in Taiwan |
| Language | zh-TW |
| Detected Language | English |
| Type | 學位論文 ; thesis |
| Format | 82 |
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