臺灣博碩士論文加值系統

本文主要分析海南島文昌地區27個以及泰國坤敬地區5個似曜岩類之主要元素、31個微量元素和Rb-Sr同位素之成份，此等似曜岩類均具有坑洞的表面，折射率、密度與化學成份均相當相似，且和中南半島Splash-form似曜岩類非常相近。
根據化學成份，推斷海南島和中南半島亞散佈區的似曜岩類具有相似之來源，且和後太古代之上部地殼岩石有關。此外，海南島似曜岩類具有較高之正εSr(0)，顯示此等似曜岩類之原始物質和後太古代大陸地殼沈積岩相近。
從Sr同位素資料顯示，海南島似曜岩類並不是源自於地函和年輕的沈積物（如土壤或黃土）。而根據Rb-Sr同位素資料Blum(1992)認為原始沈積物質的沈積時間應接近於170Ma(侏羅紀)。
經由不同比例原始岩石之混合計算指出，最適合海南島文昌地區似曜岩類的混合比例是：47﹪頁岩，23﹪砂岩，25﹪混濁砂岩和5﹪石英岩；而泰國坤敬地區似曜岩類之混合比例是：46﹪頁岩，2﹪砂岩，20﹪混濁砂岩和32﹪石英岩。

目錄
頁碼
圖目……………………………………………………………………Ⅰ
表目……………………………………………………………………Ⅳ
摘要…………………………………………………………………….Ⅴ
第一章 緒論…………………………………………………………….1
第二章 研究方法………………………………………………………10
2-1 標本採集………………………………………………….10
2-2 標本之處理……………………………………………….10
2-3 顯微鏡岩象觀察………………………………………….11
2-4 全岩化學分析…………………………………………….11
2-4-1 原子吸收光譜儀分析……………………………...11
2-4-2 分光光度計分析…………………………………...12
2-4-3 燒失量(L.O.I)測定………………………………...13
2-4-4 感應偶合電漿質譜儀分析………………………...13
2-5 實驗的精密度…………………………………………….16
2-6 同位素分析……………………………………………….16
2-6-1 Rb-Sr同位素分析…………………………………16
2-6-2 40Ar/39Ar同位素定年………………………………16
第三章 研究結果………………………………………………………21
3-1 物理性質………………………………………………….21
3-2 似要岩類之化學特性…………………………………….23
3-2-1 主要元素…………………………………………..23
3-2-2 微量元素…………………………………………..30
3-2-3 稀土元素…………………………………………..39
3-2-4 Rb-Sr同位素………………………………………46
3-2-5 Ar-Ar同位素………………………………………53
第四章 討論……………………………………………………………54
4-1 海南島文昌地區和泰國坤敬地區似要岩類之
可能原始物質……………………………………………54
4-1-1 主要元素含量…………………………………….54
4-1-2 微量元素比值…………………………………….54
4-1-3 稀土元素分布…………………………………….56
4-1-4 同位素資料……………………………………….60
4-1-5 可能的成因模式………………………………….63
4-2 海南島文昌地區與泰國坤敬地區似要岩類原
始物質混合比例之探討…………………………………64
4-3 澳大拉西亞似要岩類撞擊坑之探討…………………….65
第五章 結論……………………………………………………………76
誌謝……………………………………………………………………..77
參考文獻………………………………………………………………..78

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