原名「台灣學術線上」
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項次 書目
1
題名:A Preliminary Study of Seismic Stratigraphy of the Late Cenozoic Sequences in the Tainan Basin off Southwestern Taiwan    
台灣西南外海台南盆地新生代後期地層之震波地層學研究
著者:Ho-Shing Yu(俞何興) ;Shang Jane Lin(林香珍)
出版地區:台灣
出版城市:台北市
學科:地球科學
刊名:Terrestrial, Atmospheric and Oceanic Sciences
卷期:2卷2期(1991.6)
頁碼:75-93
語言:英語
摘要: 中文摘要PDF ; 英文摘要PDF

本研究以震波地層學來討論台灣西南外海台南盆地生代後期地層之性質及其發展歷史。總共在海上作業完成參佰多公里長的多頻道震測剖面,其中有四條傾角測線,三條走向剖面,其品質介於尚可與優之間。 由震波剖面確認新生代後期地層具有相當地整一性,並定出更新世及上新世的震波序列。新生代後期地層之震波結構特徵?平行、次平行及發散狀。平行震波結構意謂著具有相當一臻沈積速率的淺海沈積物,堆積在研究區域的大陸棚上,而發散結構及楔形的外觀指出陸棚上之部份沈積相其沈積速率有側向變化及漸進的向外海傾餘。震波相分析指出,新生代後期之沈積物主要在近海環境生成。上新世及更新之區域構造代表著相當平緩的大陸棚部份而無明顯的棚一坡分界點。上新世及更新世之棚一坡分界點推測應遠於現今大陸棚界之位置。 由震波速度模式得知層速度介於1,800公尺/秒及4,000公尺/秒之間,推測新生代後期地層以砂、而岩?主。層速度的從向變化指出速度隨著深度而增快,?反應壓實作用(深埋作用)。 由震波序列、震測相及速度分析結果認?,上新世及更新世兩個沈積序列發展成一個楔形碎屑沈積岩體。其?中國南部大陸邊緣的一部份,自壹仟多萬年以來,持續受大陸邊緣傾斜及下陷作用影響。
This study investigates the late Cenozoic strata in the Tainan basin off southwestern Taiwan. The nature and development history of late Cenozoic sequences are discussed in terms of seismic stratigraphy. Multichannel seismic profiles more than 330 km long were acquired and processed, including 4 dip profiles and 3 strike lines. The quality of the seismic profiles range from fair to good. Seismic profiles show that late Cenozoic strata are relatively conformable stratigraphic successions from. which Pleistocene and Pliocene seismic sequences are defined. The seismic reflection configurations of the late Cenozoic sequences are characterized by parallel, subparallel and divergent patterns. The parallel pattern suggests that sediments accumulated at a relatively uniform rate on a shallow shelf within the study area. The divergent reflection pattern and the external wedge- shape of the sequences indicate lateral changes in depositional rates and progressive tilting of the shelf facies. Seismic facies analysis indicates that late Cenozoic sediments were deposited mainly in the fluvial-nearshore environments. The regional trends of the Pliocene and Pleistocene sequences represent relatively smooth parts of the shelf without the characteristic shelf-slope breaks. The shelf breaks in the Pliocene and Pleistocene sequences are probably situated farther seaward than today’s shelf edge. Velocity models indicate an interval velocity ranging from 1,800 m/s to 4,000 m/s suggesting that the late Cenozoic sequences are composed mainly of sands and shales. Vertical distribution of the interval velocity shows that the yelocity of the sequences increases with depth as a result of compaction (i.e. depth of burial). Analyses of seismic sequences, seismic facies and velocity suggest that the Pleistocene and Pliocene sequences developed into a clastic wedge. The sequences form parts of the South China continental margin which has undergone tilting and subsiding during the past ten or more million years.


    

本卷期目次
Terrestrial, Atmospheric and Oceanic Sciences 2卷2期 (1991.6)
Observational Study of a Multiple Microburst-Producing Storm Part Ⅱ: A Comparison between the Simple Case and the Complex Case/ Yeong-Jer Lin
Variation of Ichthyoplankton Density Across the Kuroshio Edge Exchange Area with Implications as to the Water Masses/ Tai-Sheng Chiu
A Preliminary Study of Seismic Stratigraphy of the Late Cenozoic Sequences in the Tainan Basin off Southwestern Taiwan/ Ho-Shing YuShang Jane Lin
Observational Study of a Multiple Microburst-Producing Storm PartⅠ: Kinematic, Dynamic and Thermodynamic Structures/ Yeong-Jer Lin
 
   
 
   

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