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研究生:邱子虔
研究生(外文):Tzu-chien Chiu
論文名稱:南海東南海域MD972142岩心晚第四紀浮游有孔蟲氧同位素地層及古海洋變遷
論文名稱(外文):Late Quaternary Planktic Foraminiferal Oxygen Isotope Stratigraphy of Core MD972142 and Paleoceanographic Changes in the South China Sea
指導教授:魏國彥魏國彥引用關係
指導教授(外文):Kuo-yen Wei
學位類別:碩士
校院名稱:國立臺灣大學
系所名稱:地質學研究所
學門:自然科學學門
學類:地球科學學類
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:70
中文關鍵詞:南海南部晚第四紀浮游有孔蟲MD972142氧同位素地層古海洋古氣候西太平洋暖池
外文關鍵詞:South China Sealate Quaternaryplanktic foraminiferaMD972142isotope stratigraphyWest Pacific Warm PoolGlobigerinoides ruberpaleoceanography
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本研究分析位於南海東南部菲律賓巴拉望島西北方MD972142岩心 (北緯12度, 東經119度, 水深1557公尺, 全長35.91公尺)之浮游有孔蟲Globigerinoides ruber殼體氧同位素含量,建立了南海東南部晚第四紀以來之氧同素地層第1期至第21期的紀錄。MD972142岩心浮游有孔蟲氧同位素時間序列呈現受軌道偏心率(100 kyr)、地軸傾斜率(41 kyr)、歲差(23 kyr及19 kyr)等天文參數影響的週期性變化,顯示MD972142岩心浮游有孔蟲殼體氧同位素紀錄的變化主要受冰川消長控制。
MD972142岩心冰期-間冰期旋回與代表全球冰川消長的「全球氧同位素綜合曲線」架構雷同,亦與「低緯度區氧同位素綜合曲線」的架構相仿,惟部分氧同位素事件異於「全球氧同位素綜合曲線」和「低緯度區氧同位素綜合曲線」。配合其他古溫度重建(尤柏森, 2000; 鄭郁豫, 2000),可知南海東南部在氧同位素第5期大部分時段仍位於西太平洋暖池的範圍內。MD972142岩心的氧同位素數值低於鄰近蘇祿海ODP769岩心(Linsley and Dunbar, 1994)的紀錄,而且在過去幾次間冰期兩海盆的氧同位素數值差異比冰期時的差值還大,可能導因於間冰期時夏季季風增強,使中南半島、蘇門達臘、婆羅州附近的雨量增加,供給南海南部大量淡水,造成南海東南部與蘇祿海的鹽度差異,表現在MD972142以及蘇祿海ODP769兩岩心的氧同位素差值上。此外,間冰期時加強的溶解作用亦可能影響MD972142和ODP769岩心之間的氧同位素差值。
MD972142岩心氧同位素地層在氧同位素第5期、第8期初至第9期、以及第13期末至第15期末可與中國洛川黃土剖面中土壤層S1、S3、S5之磁感率紀錄相對比,此海域及陸域之間的”遙連鎖”可能受控於季風的消長,增強的夏季季風在黃土剖面土壤層的磁感率以及南海南部浮游有孔蟲之殼體氧同位素中記錄了同步的訊號。由本研究推知,晚第四紀以來南海東南海域由於季風及蒸發/降雨的變化連帶影響海表溫度和鹽度,造成西太平洋暖池邊緣的不穩定。
致謝
摘要
目次
圖目
表目
一、簡介1
1.1研究目的1
1.2西太平洋邊緣海與南海3
1.3南海的古氣候研究近況4
二、原理6
2.1浮游有孔蟲殼體的氧同位素6
2.1.1氧同位素的定義及影響因素6
2.1.2浮游有孔蟲Globigerinoides ruber7
2.2氧同位素地層、第四紀冰期-間冰期變遷與米蘭科維奇天文理論7
2.2.1有孔蟲氧同位素地層7
2.2.2米蘭科維奇天文理論(Milankovitch Theory)8
三、研究材料與方法9
3.1 研究材料MD972142岩心9
3.2研究與分析方法9
3.2.1岩心部分9
3.2.2有孔蟲部分9
3.2.3實驗前處理10
3.2.4質譜儀部分10
3.3氧同位素地層與年代模式之建立11
3.3.1碳十四定年11
3.3.2氧同位素期的建立12
3.3.3檢測年代模式12
四、結果14
4.1 MD972142岩心氧碳同位素地層14
4.1.1各個間冰期、冰期的氧同位素紀錄18
4.1.2各個冰消期(Glacial Terminations)30
4.2時間序列分析(Time-series Analysis)31
五、討論35
5.1南海東南海域的冰期-間冰期旋回35
5.1.1 MD972142岩心氧同位素地層於上次間冰期的特殊現象35
5.1.2 MD972142岩心紀錄中部分時段特殊的大幅度氧同位素數值變化37
5.2南海東南部與蘇祿海的表層水差異39
5.3南海東南部與中國黃土的古氣候對比50
5.3.1 特殊的氧同位素第14期50
5.3.2 MD972142岩心氧同位素地層與洛川黃土磁感率紀錄之對比50
六、結論58
七、附錄60
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