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系統識別號 U0026-1708201219481200
論文名稱(中文) 南海沉積物三萬兩千年來自生氧化物和岩屑相稀土元素分析及鍶、釹同位素組成與氣候變化之關聯
論文名稱(英文) Authigenic and Detrital REE, Sr and Nd Isotopes in the South China Sea Sediments: Implications of Paleoclimatic Change During the Past 32 ka
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) 廖韋嵐
研究生(英文) Wei-Lan Liao
電子信箱 ininppo@gmail.com
學號 L46994093
學位類別 碩士
語文別 英文
論文頁數 91頁
口試委員 指導教授-游鎮烽
口試委員-楊懷仁
口試委員-何恭算
中文關鍵字 南海  釹同位素  鍶同位素  氣候變遷  岩心MD05-2901 
英文關鍵字 South China Sea  Sr & Nd isotope  climatic change  MD05-2901 
學科別分類
中文摘要 南海,西太平洋最大的邊緣海。地表物質經風力作用和河流侵蝕作用進入海洋,是海洋中元素的主要來源。南海的水團循環已廣泛研究,然而大陸邊緣與海洋的相互作用(邊界交換,boundary exchange)及其對海洋同位素化學影響的信息仍然是未知的領域。因此,本研究分析南海沉積物岩心MD05-2901,探討自生氧化物和岩屑相稀土元素濃度及鍶、釹同位素組成與古氣候變化事件(距今三萬兩千年)的關聯性。本研究結果顯示,南海沉積物中稀土元素濃度與氣候變化無顯著關聯;然而,鍶釹同位素組成則良好反應古氣候變化事件。自生氧化物中鍶同位素組成 (0.709262 - 0.709313) 高於南海海水平均鍶同位素組成 (0.70918),顯示鍶同位素易受到岩屑相影響。透過釹同位素組成說明南海確有邊界交換效應,將陸源訊號帶入海洋。自生氧化物與岩屑相中的釹同位素組成變化皆與氣候有關:於Bølling/Allerød時期 (13.5-15.0 ka BP),εNd值分別驟降至-12.10及-9.6;而在新仙女木事件發生時期(~12.8 ka BP)則分別出現近-10.2與-6.31的峰值,推測與陸棚溶解態釹自各陸源輸入的影響有關。另外,配合鍶釹沉積物示蹤,顯示三萬兩千年來南海沉積物岩心MD05-2901來源變化不大,主要為珠江、湄公河、紅河之貢獻,並且進一步說明海洋沉積物源變化與氣候之關聯性。
英文摘要 South China Sea (SCS) as the marginal sea is, via river sediment discharges, the major source of a number of elements to the ocean. Thus, SCS plays a role of a source and/or a sink of elements for the ocean. Water mass circulation in the SCS has been widely studied; however information of the margin/ocean interactions and their influence on the oceanic isotopic chemistry is still sparse. Here, we present the REE concentrations, Nd and Sr isotopic data in Fe-Mn oxyhydroxides (authigenic phase) and detrital phase of the core MD05-2901, which developed during the last 32 ka. Moreover, 87Sr/86Sr and εNd analysis of sediments were combined to trace the elemental sources, and to evaluate the relative proportions of different end-members. All of the authigenic phases yielded 87Sr/86Sr values varying from 0.709262 and 0.709313 that are offset from the seawater value of 0.70918, which suggested that some detrital contamination involved in Core MD05-2901. The εNd values in authigenic and detrital phases vary with the abrupt climatic events. During the Bølling/Allerød period, εNd value was as low as -12.10 and -9.6 in detrital and authigenic phases, respectively. In contrast, the εNd value becomes slightly high (-10.28 and -6.3 in detrital and authigenic phases, respectively) during the Younger Dryas event. The paleoclimatic changes affect sediment transport pathways to SCS have been further clarified.
論文目次 ABSTRACT.................................................i
摘要.....................................................ii
致謝....................................................iii
TABLE OF CONTENTS.......................................iv
LIST OF TABLES.........................................vii
LIST OF FIGURES.......................................viii
APPENDIX................................................xi

Chapter 1.Introduction...................................1
1.1 Geochemical properties of REE........................1
1.1.1 Ce-Anomaly.........................................3
1.1.2 MREE Bulge.........................................4
1.2 Provenance Tracer....................................6
1.2.1 Sr Isotope.........................................6
1.2.2 Nd Isotope.........................................7
1.2.3 Mineral Sorting....................................9
1.3 Nd Isotope in Seawater..............................10
1.3.1 Geochemical Behaviours............................10
1.3.2 Nd Paradox........................................15
1.3.3 Study in Fe-Mn Oxyhydroxides......................17
1.4 Sr Isotope in Seawater..............................19
1.4.1 Geochemical Behaviours............................19
1.4.2 Study in Fe-Mn Oxyhydroxides......................19
1.5 Study Aims..........................................21

Chapter 2.Study Area....................................22
2.1 South China Sea.....................................22
2.2 Materials...........................................24
2.2.1 Core Sampling.....................................24
2.2.2 Age Model.........................................25

Chapter 3.Methods.......................................28
3.1 Laboratory Environment..............................28
3.2 Pre-Treatment.......................................30
3.2.1 Authigenic Fe-Mn Oxyhydroxides....................33
3.2.2 Detrital Fraction.................................37
3.3 Chemical Separation.................................38
3.3.1 Nd Purification...................................38
3.3.2 Sr Purification...................................42
3.4 Instrument Analysis.................................43
3.4.1 Elemental Concentration Measurements..............43
3.4.2 Nd IC Measurements................................44
3.4.3 Sr IC Measurements................................46

Chapter 4.Results.......................................48
4.1 Detrital Fraction...................................48
4.1.1 REE Pattern.......................................48
4.1.2 Nd ICs............................................50
4.1.3 Sr ICs............................................50
4.2 Authigenic Fe-Mn oxyhydroxides......................53
4.2.1 REE Pattern.......................................53
4.2.2 Nd ICs............................................56
4.2.3 Sr ICs............................................56

Chapter 5.Discussion....................................59
5.1 REE Patterns in Core MD05-2901......................59
5.2 Sr Isotopic Mixing..................................62
5.3 Nd Isotopic Signature...............................66
5.4 Provenance of the Core MD05-2901....................69
5.5 Climatic Change Control on Provenance...............72

Chapter 6.Conclusions...................................77

References..............................................79
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