碩士 / 國立臺灣海洋大學 / 應用地球科學研究所 / 94 / Abstract
The sea-floor spreading of the South China Sea (SCS) was stopped since Miocene; this probably means that the plate tectonics in the SCS is in a stable situation. According to the magnetic anomaly, the sea-floor spreading of SCS was started in Oligocene and stopped in Miocene, and the continental rifting probably happened around Mesozoic. There are many differences between the northern and the southern sides of SCS. As we can see in the SCS regional map; the northern side is the continental shelf covered by thick sediments; and the southern side are numerous coral reef islands, the Spratly islands, covered up to 2-3 km thick of carbonates. Based on the seismic profiles, it shows a serial of normal faults in the northern side, and in the southern side are normal faults and thrust faults with different slip directions. The southern side has also a long history related to the formation of the reef islands. It probably means that the early continental rifting of the SCS is the passive Atlantic type shear processes.
It is not so easy to do the large scale survey around the southern side, due to its difficulty on island’s disputes among 6 countries. Our research is combining with the existing seismic profiles and drilling data, and identify all the important unconformities. After that, we draw an inference to the history of continental rifting of SCS, which means the period of the continental crust departed from the Euro-Asia plate since 65 Ma to the beginning of sea-floor spreading in the SCS basin. We focus on the discussing of the evolution of Spratly islands and how they become the reefal island today. Because of the Spratly islands are very close to one of the world major petroleum production area, and it has already discovered oil and gas in the eastern, western, and southern sides. Considering its particular conditions of the coral reef topography and the growing ages, they are closed to the petroleum-forming conditions.
| Identifer | oai:union.ndltd.org:TW/094NTOU5135001 |
| Date | January 2006 |
| Creators | Chin-Li Su, 蘇晉立 |
| Contributors | Chao-Shing Lee, 李昭興 |
| Source Sets | National Digital Library of Theses and Dissertations in Taiwan |
| Language | zh-TW |
| Detected Language | English |
| Type | 學位論文 ; thesis |
| Format | 68 |
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