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1
題名:Physiographic and Geologic Frameworks of the Shelf-Slope Region off Northeastern Taiwan    
台灣東北海域大陸棚-坡區的地形與地質架構
著者:Ho-Shing Yu(俞何興) ;Gwo-Shyh Song(宋國士)
出版地區:台灣
出版城市:台北市
學科:地球科學
關鍵字:台灣 ; 東海 ; 大陸棚 ; 大陸斜坡 ; 地形 ; 地質 ; Taiwan ; East China Sea ; shelf ; slope ; physiography ; geology
刊名:ACTA Oceanographica Taiwanica
卷期:38卷1期(2000.6)
頁碼:1-22
語言:英語
摘要: 中文摘要PDF ; 英文摘要PDF

東海大陸棚與大陸斜坡是台灣東北部大陸邊緣上主要的地形區。東海大陸棚海床淺而平坦,其棚裂平均深度為120公尺,橫向呈現一種簡單向上凸起的剖面,反映出18,000年前冰期的效應。 東海大陸斜坡的寬度介於73與94公里之間。它的上界是東海大陸棚裂,其下界位於水深1700與2030公尺之間,接近南沖繩海槽的底部。整體而言,此斜坡的平均度坡為1.31度,側向上的坡度變化不大。海底峽谷及許多溝渠切割此斜坡,造成不規則的海底地形。構造上,東海大陸斜坡是南沖繩海槽的北坡。此斜坡的形貌與規模大小和成熟的大陸斜坡差異極大,由於它的成因與年輕弧後張裂有關。 台灣東北海域之東海大陸棚與東海大陸斜坡是由一系列張裂事件造成的,沿著歐亞大陸邊緣發生廣泛的張裂正斷層及大量的陸源沉積物堆積。晚白堊紀-早第三紀的張裂正斷層伴隨著晚第三紀-第四紀的地殼下陷與淺海沉積物堆積,形成今日的東海大陸棚。晚中新世-第四紀弧後張裂造成傾斜的正斷層岩塊被隨後來自大陸棚的沉積物覆蓋,形成今日的東海大陸斜坡。
The East China Sea Shelf and East China Sea Slope are the major physiographic provinces of the continental margin off northeastern Taiwan. The shallow and flat East China Sea Shelf has an average shelf break depth of 120m and shows a simple type of convex-up profile form, reflecting the effect of Quaternary glaciation about 18,000 years ago. The East China Sea Slope has a width ranging from 73 to 94 km. Its upper limit is at the shelfbreak, and its lower boundary ranges from water depth of 1700 to 2030 meters near the bottom of southern Okinawa Trough. Overall, it shows moderate lateral variation in gradient with an average slope angle of 1.31 degrees. This slope is transversely dissected by submarine canyons and many gullies which produce irregular sea floor topography. Structurally, the East China Sea Slope is the northern flank of Okinawa Trough. It is quite different in size and morphology from mature continental slopes due to its young back-arc basin related formation. The shelf and slope region off northeastern Taiwan was formed by a sequence of extensional episodes that produced extensive normal faulting and massive terrigeneous deposition along the Eurasian continental margin. Rift faulting during the Late Cretaceous-Early Tertiary, together with subsequent subsidence and deposition of shallow marine sediments in the Late Tertiary and Quaternary resulted in today's East China Sea Shelf. In comparison, tilted normal fault blocks formed by back-arc extension during the Late Miocene to Quaternary and subsequent deposition of sediments from the nearby shelf have produced the present-day East China Sea Slope.




本卷期目次
ACTA Oceanographica Taiwanica 38卷1期 (2000.6)
Physiographic and Geologic Frameworks of the Shelf-Slope Region off Northeastern Taiwan/ Ho-Shing YuGwo-Shyh Song
南太平洋長鰭鮪分佈與洄游之初步探討/ 許泰隆葉昭慶王健雄
A Study on Typhoon Swell Decay by an Adverse Wind/ Wen-Chung LinNai-Kuang Liang
Chromatographic evidence of the presence of Prochlorococcus in the East China Sea/ Nian-Zhi JiaoNian-Hong ChenI-Hsun Ni
渦旋的不穩定性與最佳激發理論/ 李啟運
一種新浮式防波堤構想/ 梁乃匡
 
   
 
   

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