主要源自光合作用的生物，長碳鏈正烷類被廣泛的應用在古氣候重建的研究中；而對於正烷類在當代陸棚－陸坡系統分佈的研究，則是讓此一替代指標在古環境研究中獲得適當解釋的基礎。然而，與其他已發表的系統迥異的是，臺灣海峽表層沉積物中的正烷類缺乏奇數碳的優勢。由於此現象可追溯至河流沉積物，前人推測可能是陡峭山溪型河川攜入大量岩石源正烷類、進而稀釋植物源訊號所造成，但此一假設尚未獲得驗證。本研究的目的為分析變質岩中正烷類的分子組成，提供檢驗此假設的基礎資料。結果發現，隨著變質程度增加，岩石中的正烷類總濃度下降，平均碳鏈長變短，與短碳鏈正烷類的比例增加，碳優勢指數變質度接趨近於1，意即無奇數碳的優勢。本研究進一步建立了一個以碳優勢指數與有機碳正規化正烷類濃度為參數的混合模型，並估算出岩石源正烷類在濁水溪河流沉積物的貢獻度為48到100%。

Derived mainly from phototrophic organisms, n-alkanes are one of the most widely employed compound groups in paleoclimate reconstruction. The modern distribution of n-alkanes has been investigated in several shelf-slope systems to serve as the basis for proper paleoenvironmental interpretation of this proxy. However, the lack of odd-over-even preference in carbon number in the n-alkanes from the Taiwan Strait surface sediment distinguishes this setting from other published systems. As such a feature can be tracked back to the river sediment, it has been postulated that the strong erosion of the steep mountain rivers is responsible for diluting plant signals by lithic n-alkanes, but no rock samples have ever been examined to verify the hypothesis. The aim of this study is to examine the molecular composition of n-alkanes in the metamorphic rocks of Taiwan. The results show that as the metamorphic grade increased, the total concentration of n-alkanes became lower, the average chain length shortened, the proportion of short-chain n-alkanes was elevated, and the carbon preference index value approached 1, indicating no odd-over-even preference. A mixing model was developed based on the parameters of CPI and TOC-normalized n-alkane concentration, and the estimated contribution of lithic source was between 48 to 100% to the n-alkane pools in the Zhoushui River sediments

Contents
Acknowledgements i
摘要 iii
Abstract iv
Contents v
Chapter 1. Introduction 1
Chapter 2. Material and methods 6
2.1. Geological setting of the study area 6
2.2. Sample collection and pretreatment 8
2.3. Preparation for lipid analysis 9
2.4. Blank tests 10
2.5. Bulk analyses 11
2.6. Instrumentation 12
Chapter 3. Results 16
3.1. n-Alkane contamination 16
3.2. Molecular composition of n-alkanes 17
3.3. Concentrations and stable isotopic values of carbonate and TOC 19
Chapter 4. Discussion 26
4.1. Contamination control 27
4.2. Alteration of n-alkanes during metamorphism 28
4.3. Fraction of fossil n-alkanes in the Zhoushui River sediment 31
Chapter 5. Conclusion 39
References 41
Appendix 45

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