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研究生:陳妙珍
研究生(外文):Miaw-Zen Chen
論文名稱:OceanDrillingProgram(ODP)184航次南海北坡1146站位晚中新世至晚上新世超微化石的古海洋意義
論文名稱(外文):Late Miocene to late Pliocene calcareous nannofossils paleobiogeography and paleoceanography of Ocean Drilling Program (ODP) Leg 184,Site 1146, northern South China Sea.
指導教授:陳民本陳民本引用關係
指導教授(外文):Min-Pen Chen
學位類別:碩士
校院名稱:國立臺灣大學
系所名稱:海洋研究所
學門:自然科學學門
學類:海洋科學學類
論文種類:學術論文
論文出版年:2000
畢業學年度:88
語文別:中文
論文頁數:133
中文關鍵詞:Q型因子分析Reticulofenestra
外文關鍵詞:Q-mode factor analysisReticulofenestra
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本研究從Ocean Drilling Program (ODP) 184航次在南海北坡 Site 1146(19027.40''N,116016.37''E,水深2091公尺)鑽取的岩心中,取mcd 170.46~327.25這一段的沈積物,由沈積物中超微化石的分佈探討南海北坡晚中新世至晚上新世(6~2Ma)之古海洋。在研究中,同時利用Deep Sea Drilling Project(DSDP)在西太平洋--印度洋的上新世超微化石族群作Q型因子分析,所得到三個主要因子,其主要代表種屬分別為Discoaster、Reticulofenestra-Calcidicus與Helicosphaera,並根據其生物地理分佈的特性,可將此三個因子分別代表''暖水團''、''冷水團''與''季風影響''三個特徵。由Site 1146的超微化石族群求出的因子負荷量顯示,南海北坡從3.6Ma開始慢慢變冷,而在2.6Ma完全進入冷期。此外,本研究測量Reticulofenestra之形態變化,並將此變化與暖水團因數變化及氧18同位素值的變化相對照,由暖水團因數及氧18同位素值的變化發現在中新世晚期至上新世之間有三個相對較為溫暖的時期,分別是:
第一暖期:2.7~3.4Ma,此時為一個全球暖化事件
(middle Pliocene global warming)
第二暖期:4.2~4.6Ma
第三暖期: 5.5~6Ma
而在這三個相對較為溫暖的時期,Reticulofenestra因環境的變暖,會有較大尺寸(長軸、寬與開口長度)的球石片產生。
Late Miocene to Late Pliocene (~6-2 Ma) calcareous nannofossils at Ocean Drilling Program Site 1146 were analyzed. Q-mode factor analysis of nannofossil assemblages and biometric study of Reticulofenestra were conducted to provide a better understanding of their implications to paleoceanography. Site 1146 is located at the north slope of the South China Sea (19o27.40’N, 116o16.37’E) under 2091 m of water.
Q-mode factor analysis of Pliocene nannofossils from 65 Deep Sea Drilling Project sites in the Indo-Western Pacific region obtain 3 varimax factors which explain 92.8% of the total variance. The loadings of the 3 factors are clearly related to distinct geographical zones. Factor 1 is dominated by Discoaster and controls most part of the low to mid-latitude, warm marine environments, reflecting strong influence of warm water masses. Factor 2 is dominated by Reticulofenestra and Calcidiscus. It controls the high latitude oceans and is influenced mainly by cold water masses. Factor 3 is dominated by Helicosphaera and controls the low latitude Indian and western Pacific Oceans. It is most likely affected by the Monsoons. Factor scores of Site 1146 nannofossil assemblages indicates a gradual cooling of the northern South China Sea from 3.6 Ma to 2.6 Ma and an accelerated cooling stage after 2.6 Ma. Correlation of Factor 1 and δ18O indicates 3 relatively warmer stages in the late Miocene and Pliocene: 6-5.5 Ma, 4.6-4.2 Ma, and 3.4-2.7 Ma. Biometric study indicates that the maximum diameter (length) of Reticulofenestra changes systematically during the latest Miocene and Pliocene. Larger Reticulofenetra are more abundant in warmer stages while smaller Reticulofenestra spp. are more abundant during the colder stages.
誌謝………………………………………………………………..I
摘要……………………………………………………………….II
英文摘要…………………………………………………………III
第一章 前言……………………………………………………..1
第二章 研究樣本來源…………………………………………..7
第三章 研究方法………………………………………………12
第四章 研究結果……………………………………………....18
第五章 討論…………………………………………………....35
第六章 結論…………………………………………………....43
第七章 分類整理……………………………………………....45
參考文獻………………………………………………………....55
附圖………..……………………………………………………..60
附表…….……………………………………………………...…84
圖版…………………………………………………………..…110
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參考網站
Ocean Drillng Stratigraphic Network :
http://www.odsn.de/
NASA Goddard Institute for Space Studies :
http://www.giss.nasa.gov/research/paleo/pliocene
The Delphi Project
http://delphi.esc.cam.ac.uk
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