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題名 | Tectonic Evolution of the South China Sea Region=南海新生代構造演化 |
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作者 | 李通藝; Lawver,Lawrence A.; |
期刊 | 中國地質學會會刊 |
出版日期 | 19921000 |
卷期 | 35:4 1992.10[民81.10] |
頁次 | 頁353-388 |
分類號 | 356.2 |
語文 | eng |
關鍵詞 | 南海; 新生代; 構造; 演化; |
中文摘要 | 我們使用三維電腦繪圖工作站,從事新生代南海地區的板塊重建工作。從分析南海地區的地質及地球物理資料,可以推斷南海中生代晚期以降可能有兩次至三次的擴張發生。第一次是從晚白堊系到始新世,主要是西北-東南向的擴張,第二次在晚始新世到早中新世,主要是南-北向擴張,第三次發生在漸新世以後,主要是西北-東南向擴張。 上新世以來,南海海塊向菲律賓島弧在馬尼拉海溝俯衝,使得歐亞大陸邊緣和北呂宋弧在臺灣附近碰撞。由於北呂宋弧沿著菲律賓斷層運動,使得弧--陸碰撞主要是在西北西-東南東方向進行。 |
英文摘要 | We have attempted to place the tectonic history of the South China Sea Basin in a regional framework. To do that, we analyzed the tectonic evolution of the major blocks surrounding the South China Sea as well as the relative motions of the Indian and Australian Plates. We have tried to rectify the available tectonic models in this region. A 3-d graphics terminal was utilized to derive rotation poles for the different tectonic blocks and then tested our model to determine its self-consistency. When the model conflicted with previous interpretations, the input data were evaluated for alternative explanations. We present reconstrcutions of the South China Sea region at 60 Ma, 40 Ma, 30 Ma, 20 Ma, 10 Ma and 5 Ma. Our reconstructions, along with detailed geological and geophysical information, may be used as a predictive tool for basin evolution models and block interactions in this region. At least two and possibly three stages of extension can be recognized in this region. The earliest one, active in the Late Cretaceous to Eocene, involved NW-SE extension. The tsecond one, active from Late Eocene to Early Miocene involved north-south extension. The first stage of extension which was probably NW- SE, can be dated as post-Oligocene. The first extensional event produced the NE-SW trending proto-South China Sea and a series of sedimentary basins along the South China margin. Following the southeastward extrusion of indochina, the proto-South China Sea has been mostly consumed at the Palawan Trough. Renewed north-south extension in the South China continental margin started the present-day South China Sea spreading in the Oligocene. The southeastward extrusion of Indochina, blocked by the Sundaland, resulted in the NW-SE opening of the South China Sea Basin in the Early Miocene. Collision of the North Palawan microcontinental block with the West Philippines block stopped the opening of the South Cina Sea at the end of Early Miocene. Spreading activity switched to the Sulu Sea Basin in the Middle Miocene but collision between the Sulu Ridge and the West Philippines at Mindanao halted the opening of the Sulu Sea at the end of Middle Miocene. In the Late Miocene Greater India continued its northward path; it seems to have ripped open the Andaman Sea. In the Pliocene, subduction along the northern Manila Trench placed the North Luzon Arc on a collision path with the East Asia continental margin at Taiwan. Motion along |
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