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題 名 | Submarine Physiography around Taiwan and Its Relation to Tectonic Setting=臺灣周圍之海底地形與地體構造架構之關係 |
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作 者 | 俞何興; 宋國士; | 書刊名 | 中國地質學會會刊 |
卷 期 | 36:2 1993.04[民82.04] |
頁 次 | 頁139-156 |
分類號 | 351.926 |
關鍵詞 | 地體構造; 架構; 海底地形; 臺灣; |
語 文 | 英文(English) |
中文摘要 | 臺灣屬於西太平洋火山島弧之一,除了陸上可見複雜的碰撞地體構造,臺灣島四 周複雜的海底地形也相當可觀。臺灣西部及北部外海的海底一般淺於二百公尺,其下為歐亞 大陸地殼;臺灣東南海域大部分屬於深海區,其深度可達六千公尺。臺灣西部及北部的海床 展現成大陸棚及大陸斜坡,海床表面的起伏很小,一般小於一百公尺;反之,有許多顯著的 地形,其起伏落差大於數千公尺,位於兩個地體活動較強的海域;東北海域的海溝-島弧系 統及南部海域的碰撞體系。 大陸棚的表面平坦,僅有少數小起伏的地貌,其為晚更新世海水面變動的產物。大陸棚的寬 度變化很大,北方陸棚寬約四百公里,而東部陸棚狹於二公里。臺灣東部海域的斜坡呈線狀 ,平行於陸上的碰撞縫合帶;西南海域的大陸坡呈一弓狀,頂點朝北、範圍寬廣,主要由源 自臺灣的上新世-第四紀沉積物堆積而成。 弧後盆地、火山島嶼、弧前盆地及海溝組成臺灣東北海域主要的地形單元。臺灣東南外海地 形以南北走向狹長的海脊與海槽為特徵,其為菲律賓海板塊與歐亞大陸板塊聚合的結果;加 瓜海盆的深海平原也是臺灣東南海域的一個主要地形單元。自早上新世以來,歐亞大陸板塊 與菲律賓海板塊相互間的運動扮演著主要角色來形成臺灣外海的海底地形。 |
英文摘要 | The island of Taiwan is among the volcanic islands that form an arc along the western Pacific. In addition to the visible complexity of the island's collision tectonics, the complex submarine topography around Taiwan is also remarkable. West and north of the island, the sea floor is generally shallower than 200 m and is underlain by the Eurasian continental crust. Off south-eastern Taiwan, a major portion of the sea floor is submerged to a depth of up to 6,000 m. The offshore areas west and north of Taiwan are floored by continental shelves and slopes, mostly nearly featureless (relief smaller than tens of meters). In contrast, many prominent physiographic features with reliefs greater than thousands of meters are present in two tectonically far more active offshore areas: the trench-arc system to the northeast of Taiwan and the collision complex in the south. The surfaces of the shelves are smooth, marked only locally by low-relief features formed by the sea-level fluctuations during the late Pleistocene. Shelf width varies from about 400 km north of Taiwan to less than 2 km off the eastern coast. The slope off eastern Taiwan is a linear narrow zone of steep slope parallel with the suture zone exposed onshore eastern Taiwan. Off southwestern Taiwan, the continental slope is a broad deep water area that is marked by outward bowing of the isobaths contouring a huge mass of Pliocene-Quaternary sediments derived from the mountainous island. The backarc basin, volcanic islands, forearc basin, trench slope break and trench form various major physiographic units of the continental margin off northeasten Taiwan. The sea floor off southeastern Taiwan is featured linearly with north-south trending ridges and troughs formed by the collision between the Philippine Sea plate and the Eurasian plate. The abyssal plain of the Gagua Basin is the major physiographic province off southeastern Taiwan. Since Early Pliocene the interaction between the Philippine Sea plate and the Eurasian plate has played an important role in making the submarine physiography around Taiwan. |
本系統中英文摘要資訊取自各篇刊載內容。