碩士 / 國立臺灣大學 / 海洋研究所 / 100 / The distribution of clay minerals in marine sediment are related to the nature of the parent rocks and the mechanism of transportation on land. Clay minerals are often used to indicate the source of sediment. In this study, the analysis of clay minerals is based on the method which published by the U.S. Geological Survey (USGS).
The clay minerals in surface the sediment of Taiwan Strait are mainly composed of illite and chlorite. The amount of kaolinite in western Taiwan Strait is higher than eastern. It shows that the composition of modern sediments from the mainland China is different from Taiwan. The highest amount of smectite is located off west Penghu Islands and highly related to its parent rock. The amount of chlorite increase alone the Changyun ridge, and it may be related to the effect of tidal current that carried fine-grain sediments and settled on the ridge.
The increase of kaolinite off western Taiwan coastal area indicates the influence of typhoon induced flooding that eroded the Tertiary strata which devastated during the 921 Earthquake.
We suggest that the rivers in western Taiwan and southeastern China are the major sources of surface sediment in Taiwan Strait. In the past, it regards that muddy sediments may be delivered from the rivers of mainland China and transported by China Coastal Water. Our results indicate the fine-grained sediments can be provided by rivers in western Taiwan, especially after the typhoon. In term of sediment dynamics, the distribution of clay minerals in the surface sediment on Changyun Ridge is highly influenced by tidal currents in the Taiwan Strait.
| Identifer | oai:union.ndltd.org:TW/100NTU05279016 |
| Date | January 2012 |
| Creators | Chi-Yu Chen, 陳琪鈺 |
| Contributors | Chih-Chieh Su, 蘇志杰 |
| Source Sets | National Digital Library of Theses and Dissertations in Taiwan |
| Language | zh-TW |
| Detected Language | English |
| Type | 學位論文 ; thesis |
| Format | 86 |
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