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| DC 欄位 | 值 | 語言 |
|---|---|---|
| dc.contributor.advisor | 林曉武 | |
| dc.contributor.author | Ying-Ying Shih | en |
| dc.contributor.author | 施迎瑩 | zh_TW |
| dc.date.accessioned | 2021-06-08T05:57:18Z | - |
| dc.date.copyright | 2011-08-22 | |
| dc.date.issued | 2011 | |
| dc.date.submitted | 2011-08-22 | |
| dc.identifier.citation | 中文部分
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J. , Kroon, D. and Alexander, I. （1997）Monsoon related variations in Zaire (Congo) sediment load and influence of fluvial silicate supply on marine productivity in the east equatorial Atlantic during the last 200,000 years. Paleoceanography, 12, 463-481. Schonfeld, J., Kudrass, H.-R.,（1993）Hemipelagic sediment accu mulation rates in the South China Sea related to late Quaternary sea-level changes. Quat. Res. 40, 368–379. Su, G. , Wang, T. ,（1994）Basic characteristics of modern sedimentation in South China Sea.Oceanology of China Sea,Dordrecht : Kluwer, 2, 407-418. Sun, X. J. and Li, X.（1999）A pollen record of the last 37 ka in deep sea core 17940 from the northern slope of the South China Sea. Mar. Geol. , 156, 227–244. Sun, X., Luo, Y., Huang, F., Tian, J. , Wang, P. (2003) Deep-sea pollen from the South China Sea : Pleistocene indicators of East Asian monsoon .Marine Geology , 201, 97-118. 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J.（2002）Astronomical forcing of the East Asian monsoon mirrored by the composition of Pliocene South China Sea sediments. Earth and Planetary Science Letters, 201,621-636. Wei, G. , Liu,Y. , Li, X.H. ,Lei, S. and Dian,Y. F.(2004) Major and trace element variations of the sediments at ODP Site 1144, South China Sea, during the last 230 ka and their paleoclimate Wei, K. Y. , Lee, M. Y. , Duan, W., Chen, C., Wan, C. H. （1998） Palaeoceanographic change in the northeastern South China Sea during the last 15000 years. Journal of Quaternary Science,13, 55-64. Windom, H.L., Schropp, S.J., Calder, F.D., Ryan, J.D., Smith Jr., R.G., Burney, L.C., Lewis, F.G., and Rawlinson, C.H., 1989. Natural trace metal concentrations in estuarine and coastal marine sediments of the southeastern United States. Environ. Sci. Technol. 23, 314-320. | |
| dc.identifier.uri | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/24852 | - |
| dc.description.abstract | 南海東北部周遭環繞台灣、菲律賓、中國大陸及許多小島，每年承接大量河川帶來之懸浮顆粒物質，沉積物之組成深受河川輸出陸源物質所影響；鈣質或矽質生物殼體沉降，也是另一種重要的沉積物來源。沉積物組成受到氣候、海平面狀態升降和陸海源物質輸入改變之影響，隨時序分布記錄下不同沉積環境的特徵。本研究利用海岩一號901航次活塞岩心採集器所取得南海東北部沉積物岩心，經由沉積物中浮游孔蟲C14定年結果重建沉積年代，以了解南海東北部過去約4萬年來古海洋環境及氣候變遷記錄。本研究亦分析沉積物中有機物質碳氮比值與有機碳、碳酸鈣、主要金屬離子含量及粒徑大小分布，來探討此段時間內沉積物來源變化及海域環境變遷影響機制。
研究結果發現南海東北部沉積物受古氣候變遷影響，大致上可分成下列三種沉積環境狀態：冰期（低海平面）、轉換期（海平面上升）及全新世（高海平面）。不同沉積環境下物質所表現的特徵也有所差異，冰期時沉積物陸源物質訊號增強，且出現粗顆粒物質沉積的頻率增加，碳酸鈣含量偏低；轉換期期間海平面上升，沉積物中特徵從陸源逐漸偏向海源，細顆粒物質含量逐漸遞增，主要離子受粒徑大小分布也隨之增加；全新世時期沉積物中海源物質訊號較強，碳酸鈣含量也約為冰期的兩倍，細顆粒物質含量也較冰期高；本研究結果顯示南海東北部沉積物組成受古氣候影響從冰期到間冰期由陸源物質沉積為主轉換成海源物質沉積。 沉積速率在南海東北部空間上之分布顯示研究測站於全新世時期，深受台灣小河傳輸陸源物質所影響。全新世氣候較溫暖且降雨量大，加上台灣小河山高水急懸浮顆粒輸出量大之特性，可藉由河川傳輸大量陸源物質至研究區域沉積；然而在過去冰期為低海平面狀態，沉積物中陸源物質訊號增強，顯示河川輸入陸源物質於冰期時可能有更重要之影響。 | zh_TW |
| dc.description.abstract | Northeastern South China Sea receive particles from Taiwan, China, Philippines and other islands. Large amounts of terrigenous suspended sediments from the surrounding rivers control composition of sediments in the South China Sea. Another major source of sediment entering the South China Sea is the biogenic calcium and siliceous biogenetic particles. In addition to terrigenous and biogenic sediments, the type and amount of sediments may vary during glacial and interglacial transitions. Little data are available in addressing variations of particles entering the South China Sea during climatic changes and temporal variations.
The objective of this study is to verify if climatic and subsequent sea-level changed were recorded in the study area. Age model was constructed using AMS 14C dating over foraminifera in the sediment to delineate 400,000 years sedimentation and climatic variations in the area. This study also analyzed carbon and nitrogen ratio of organic matter in sediments, organic carbon, calcium carbonate content, major element compositions, and particle size distribution, to understand sources of sediment. The results showed that sediments in the northeastern South China Sea strongly controlled by climate change. Based on their geochemical variations, the following three types of sedimentary environments can be identified : glacial (lower sea level), transition (sea-level rise) and Holocene (higher sea level). Each type of sedimentary environment showed different depositional pattern, with the glacial sediments (lower sea level) showing stronger terrigenous signal with more frequent of coarse particles, low calcium carbonate content, while the transition (sea-level rise) sediment showing a gradual trend from a more terrigenous type sediments to more biogenous sediment, more finer grain particulate matter, in accompany with less terrigenous major ions characters. The Holocene sediments were deposited during higher sea level with a stronger biogenous signal, twice as much of calcium carbonate content than glacial period, more fine-grained substances. | en |
| dc.description.provenance | Made available in DSpace on 2021-06-08T05:57:18Z (GMT). No. of bitstreams: 1 ntu-100-R97241406-1.pdf: 4028416 bytes, checksum: c3a1b2b7475b3f27d061d1ad3e1e64c8 (MD5) Previous issue date: 2011 | en |
| dc.description.tableofcontents | 目錄
中文摘要……………………………………………………….…….…Ⅰ 目錄…………………………………………………………….……….Ⅲ 圖目錄………………………………………………………….……….Ⅶ 表目錄……………………………………………………………..........Ⅸ 第一章 緒論……………………………………………………..............1 1.1 前言…………………………………………………….……......1 1.2 沉積環境背景……………………………………………….......2 1.3 環境變遷之指標…………………………………………….......3 1.4 研究目的…………………………………………………….......5 第二章 樣品採集與實驗方法…………………………………………..9 2.1 樣品採集…………………………………………….………...9 2.1.1研究材料..……………………………………………….........9 2.1.2採樣方式...………………………………………………........9 2.2 多重感應元岩心記錄器測量……………………………......11 2.3 樣品前處理……………………………………......................13 2.4 分析方法與實驗流程……………………………………......13 2.4-1岩心數位照片拍攝及反射色分光測定.................................13 2.4-2岩心定年分析………………………………….....................14 2.4-3沉積物含水量、孔隙率、統體密度.........................................15 2.4-4沉積物顆粒大小…………………….…………………........15 2.4-5沉積物有機碳及碳酸鈣含量……….………………………16 2.4-6沉積物有機碳/氮莫耳比值分析…………………………...17 2.4-7沉積物主要離子分析…………….…………………………17 第三章 研究結果………………………………………........................23 3.1 γ密度、孔隙率、磁感率…………………....…………….......23 3.2 岩心掃描攝影……………………………………..................24 3.3 反色率……………………………………..............................24 3.4 實測樣品之含水量、孔隙率、統體密度…..…………….......25 3.5 沉積物中黏土、粉砂及砂粒含量變化……….……………...26 3.6有機碳、有機氮、有機碳/氮莫耳比值及碳酸鈣含量含量變 化.................................................................................................27 3.7 沉積物中主要離子含量變化………………….……………..28 3.8岩心年代及沉積速率……………………………….....……....28 3.9 地化參數間之相關性……………………….…………….....29 第四章 討論………………………........................................................40 4.1 不同沉積環境下物質組成之特徵……………………..........40 4.2 海進期物質劇烈變動之因素……………………..................42 4.3 末次冰期與全新世時期沉積組成差異之因素……..……....43 4.4 南海東北部沉積速率在空間上分布及影響因素…….……44 4.5 河川輸出陸源物質對於沉積作用之影響………..………....45 4.6 主要金屬時序性變化之環境意涵…..……………..………....47 第五章 結論………………………........................................................70 第六章 參考文獻………………………................................................72 | |
| dc.language.iso | zh-TW | |
| dc.title | 南海東北部過去四萬年古海洋沉積作用和氣候變遷紀錄 | zh_TW |
| dc.title | Records of the Past 40k Years Sedimentation and Climatic Variations in the Northeastern South China Sea | en |
| dc.type | Thesis | |
| dc.date.schoolyear | 99-2 | |
| dc.description.degree | 碩士 | |
| dc.contributor.oralexamcommittee | 陳明德,王珮玲,羅建育 | |
| dc.subject.keyword | 沉積環境,南海東北部,氣候變遷, | zh_TW |
| dc.subject.keyword | Sedimentation,Northeastern South China Sea,Climatic variations, | en |
| dc.relation.page | 76 | |
| dc.rights.note | 未授權 | |
| dc.date.accepted | 2011-08-22 | |
| dc.contributor.author-college | 理學院 | zh_TW |
| dc.contributor.author-dept | 海洋研究所 | zh_TW |
| 顯示於系所單位： | 海洋研究所 | |
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