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系統識別號 U0026-2008201220442200
論文名稱(中文) 利用鋰同位素探討黃土化學風化及成壤過程
論文名稱(英文) Lithium Isotopic Fractionation during Loess Chemical Weathering and Soil Formation Processes
校院名稱 成功大學
系所名稱(中) 地球科學系碩博士班
系所名稱(英) Department of Earth Sciences
學年度 100
學期 2
出版年 101
研究生(中文) 蔡佩璇
研究生(英文) Pei-Hsuan Tsai
學號 L46994077
學位類別 碩士
語文別 英文
論文頁數 81頁
口試委員 指導教授-游鎮烽
口試委員-何恭算
口試委員-楊懷仁
中文關鍵字 鋰同位素  渭南  化學風化  次生礦物 
英文關鍵字 Lithium isotope  Weinan  chemical weathering  secondary minerals 
學科別分類
中文摘要 鋰(Lithium, Li)為一易遷移元素,其在自然界中有兩個穩定的同位素核種,分別是6Li(7.59%)以及7Li(92.41%)。沉積物中的鋰同位素比值為了解次生礦物形成過程以及矽酸鹽風化程度指標。本研究區域為中國黃土高原地區南端的渭南剖面。其為一發育良好且保存完整末次冰期與間冰期古氣候紀錄的剖面。土壤樣品取自中國渭南剖面1205公分至1295公分處,屬L2-S1期發育之土壤,利用序列淋洗將其分為兩相:岩屑相及碳酸鹽相。結果顯示渭南剖面岩屑相中鋰濃度分佈範圍在1.4~2.0 μg/g 之間,鋰同位素比值(δ7Li)範圍約在+2.5 ~ +4.7‰ 之間。岩屑相中鋰同位素比值與剖面平均粒徑大小呈現相反地趨勢,推測黃土岩屑相中鋰同位素變化與黃土中黏土礦物成分有關。渭南剖面碳酸鹽相中鋰濃度分布範圍在781 ~ 963 ng/g,其鋰同位素比值範圍在-4.1 ~ +10.2‰ 之間。黃土中碳酸鹽相中δ7Li的變化反應當時環境化學風化強度的變化。
英文摘要 Lithium (Li) is a fluid-mobile element and has two natural stable isotopes, 6Li (7.5%) and 7Li (92.5%). The 7Li/6Li ratio in secondary deposits is a highly potential proxy for understanding processes during secondary mineral formation and the degrees of silicate weathering. I studied the Weinan loess-paleosoil sequence, which represents one of the best well-developed and continuous paleo-climatic records covering the last glacial-interglacial cycle. Soil samples, collected from 1205 cm to 1295 cm in depth, were chemically divided into two parts, detrital and carbonate fractions. The Li concentrations in detrital fraction vary from 1.4 to 2.0 μg/g. The Li isotopic ratios range from +2.5 to +4.7‰. Li isotopic values tend to decrease with increasing grain size. This suggests that the Li isotope ratios in the detrital fraction most likely reflect the isotopic fractionation during clay mineral formation. On the other hand, Li isotopic ratios and Li in carbonate fraction ranging from -4.1 to +10.2‰ and from 781 to 963 ng/g, respectively. Li isotopic compositions in carbonate fraction have dramatic variation, suggesting that they might be influenced by chemical weathering intensity.
論文目次 摘要 I
ABSTRACT II
致謝 III
TABLE OF CONTENT IV
LIST OF TABLES VII
LIST OF FIGURES VIII
LIST OF APPENDIX XI
Chapter 1. Introduction 1
1.1 Behavior of Li and Li isotopes 2
1.2 Li isotopes as chemical weathering tracers 4
1.3 Li isotopes in the natural system 6
1.4 The aim of this study 8
Chapter 2. Study Area 9
2.1 Background of loess in China 9
2.2 Source of Chinese Loess Plateau 14
2.3 Clay mineral composition of loess 16
2.4 Climatological background of Weinan section 17
2.5 Sample location 18
Chapter 3. Methodology 22
3.1 Chemical reagents and standards 22
3.2 Sample preparation 23
3.2.1 Sequential leaching–loess samples in Weinan section 23
3.2.2 Clay standard dissolved 23
3.3 Chromatography 24
3.4 Analytical Instrumentation 28
3.4.1 Elements analysis 28
3.4.2 Lithium isotope analysis 30
Chapter 4. Results 37
4.1 Elemental concentration and distribution 37
4.1.1 Detritus composition 37
4.1.2 Carbonate composition 43
4.2 Li isotopic composition 48
4.2.1 Detrital fraction 48
4.2.2 Carbonate fraction 49
Chapter 5. Discussion 50
5.1 Li isotope and silicate weathering 50
5.1.1 Evidence for Li isotopic fractionation in carbonate
during chemical weathering 50
5.1.2 The δ7Li in detrital fraction regarded as source
signal 53
5.1.3 The δ7Li v.s. Grain size in detrital fraction 55
5.2 Li concentration v.s. Li isotope in Weinan profile 57
5.3 Provenance of loess material in Weinan profile 59
Chapter 6. Conclusions 62
References 64
Appendix 72
Introduction to clay minerals 72
Behavior of Li and Its Isotopes in the Clay minerals 73
Materials – Clay Standards 75
Experimental Results 81
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