Analysis of environmental index by n-alkanes in sediments of Tung-Yuan Pond
| Autor: | Yao-Sheng Hsieh, 謝耀陞 |
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| Rok vydání: | 2015 |
| Druh dokumentu: | 學位論文 ; thesis |
| Popis: | 103 In this study, we analyzed the C14-C35 n-alkanes concentrations in sediments of Tung-Yuan Pond, Pintung, to identify n-alkanes source and reconstruct palaeoenvironment and palaeoclimate. There are eighty-nine samples of 3 cm to 650.3 cm and 1,255 cm to 1,452 cm in depth, corresponding two periods from 30 yr. B.P. to 7,000 yr. B.P. and 13,500 yr. B.P. to 15,600 yr. B.P., respectively. The average concentration of the total n-alkanes(C14-C35) was 30.6±29.4 μg/g(1.3~200.1 μg/g), with predominance of odd carbon-numbered n-alkanes, such as C31, C29, C33 and C27. The environmental index CPI24-34(1.25~10.87), CPIL(1.46~ 11.72) and, TAR ratio(1.0~194.0) also indicate the terrestrial plants biological origins. The CPIS of 0.69±0.47 indicate an even carbon-numbered predominance with C16 and C18. Index C27+C29+C31(0.4~143.0 g/g) and C31/(C27+C29) ratio (0.23~2.03) suggest two major of climate types, including warm-humid and cold-dry climate. The two periods of warm-humid climate type identified were consisted with the global environmental change of the Bølling-Allerød and Holocene Hypsithermal warm events. |
| Databáze: | Networked Digital Library of Theses & Dissertations |
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