| 研究生: |
林柏宇 Lin, Bo-Yu |
|---|---|
| 論文名稱: |
利用無機沈澱溫控實驗探討碳酸鈣中穩定同位素及微量元素的分佈特性 Distribution of stable isotope and trace element in inorganic calcium carbonate: Laboratory temperature controlled experiment |
| 指導教授: |
游鎮烽
You, Chen-Feng |
| 學位類別: |
碩士 Master |
| 系所名稱: |
理學院 - 地球科學系 Department of Earth Sciences |
| 論文出版年: | 2006 |
| 畢業學年度: | 94 |
| 語文別: | 中文 |
| 論文頁數: | 99 |
| 中文關鍵詞: | 同位素 、硼同位素 、方解石 、穩定同位素 、溫度 、代用指標 、微量元素 、無機沈澱 、碳酸鈣 |
| 外文關鍵詞: | calcium carbonate, calcite, isotope, proxy, stable isotope |
| 相關次數: | 點閱:173 下載:2 |
| 分享至: |
| 查詢本校圖書館目錄 查詢臺灣博碩士論文知識加值系統 勘誤回報 |
摘要
本研究系統性控制八個溫度(5 - 40℃),固定溶液離子濃度和pH值,利用固定流速導入法固定碳酸鈣生長速率無機沈澱生成碳酸鈣。以拉曼光譜儀及掃瞄式電子顯微鏡確定礦物相為方解石,以高精度質譜術分析碳酸鈣內的微量元素Li、B、Mg、Sr、Ba和U濃度及B、O和C同位素,加以探討溫度與微量元素濃度及穩定同位素之關係,以期瞭解在無機作用下微量元素與穩定同位素對於溫度分化的關係,找出古溫度合適代用指標。
結果顯示本研究無機沈澱方解石Li/Ca接近實際鈣化情形,溫度方程式:D(Li/Ca)=0.0068e-0.0337T;B/Ca有潛力成為古溫度的代用指標,溫度方程式:D(B/Ca)=0.0088e-0.0395T;Mg/Ca絕對值較自然界高許多,顯示自然界Mg/Ca比值除受控於溫度外,仍有其他因子影響,溫度方程式:D(Mg/Ca)=0.0115e0.0366T;Sr/Ca方解石與霰石回歸線明顯區別,顯示進入碳酸鈣行為受礦物相影響大,溫度方程式:D(Sr/Ca)=0.2676e-0.0318T;Ba/Ca與無機沈澱霰石雖趨勢相同但絕對值有所差異,溫度方程式:D(Ba/Ca)=0.7296e-0.0490T;δ18O與溫度呈負相關且與理論計算方解石值相符,證實此無機沈澱方法,氧同位素可達平衡,溫度方程式δ18OPDB(‰)= -0.23 T(℃) - 3.19。U/Ca比值和δ13C與溫度無關。過去研究認為碳酸鈣中硼同位素受溫度影響不大,但本研究中碳酸鈣硼同位素隨溫度變化在5 - 40℃ 變化~17 ‰ (δ11B = -9.43 ~ -28.43 ‰),且與溫度有良好相關性δ11B(‰) = 0.52T(℃) - 30.10,欲使用硼同位素作為環境指標,需謹慎考慮溫度效應影響。
Abstract
Understanding the real correlation between incorporation of trace metals into carbonate and temperature is the most important issue for the applications of paleoceanographic and paleoclimatic researches. In this study, calcium carbonates were inorganically precipitated under eight well-controlled temperatures ranged from 5 to 40°C. Concentrations of trace elements and pH values in parent solution were maintained in order to obtain a constant precipitation rate. All of the inorganic precipitations were identified to be pure calcite crystals by using Raman spectrometry and SEM techniques. Distribution coefficients (D) for trace elements (Li, B, Mg, Sr, Ba, and U) and stable isotopes (B, C and O) were then calculated based on high precision measurements on trace elements (HR-ICP-MS) and stable isotopes (TIMS and IRMS) both in calcites and parent solutions.
Preliminary results showed that DLi/Ca is close to the biogenic carbonates (DLi/Ca = 0.0068e-0.0337T), suggesting that it can faithfully record the ambient seawater Li concentration during calcification of calcite. However, DMg/Ca, DSr/Ca and DB/Ca can be discriminated from those in natural system (DMg/Ca = 0.0115e0.0366T, and DSr/Ca = 0.2676e-0.0318T, DB/Ca = 0.0088e-0.0395T), but are highly correlated to temperature effect, indicating that other factors possibly exert an influence on the co-precipitations of Mg, Sr and B in calcite. Furthermore, incorporation of Sr into calcite seems to be affected by mineral structure based on a significant discrepancy between the previous works on aragonite and the present study on calcite. Of special interest is that DBa/Ca follows the thermodynamic substitution (DBa/Ca = 0.7296e-0.0490T), suggesting Ba/Ca may at least in part be influenced by changes in temperature. Therefore, care should be taken about temperature effect on Ba/Ca record in carbonates (e.g., coral Ba/Ca as a proxy for sediment flux and/or regional upwelling).
On the other hand, according to previous study on biogenic carbonate, temperature fractionation of boron isotope could be negligible while calcifying. Unexpectedly, there reveals a good relationship between boron isotopic composition and temperature (δ11B (‰) = 0.52T (℃) - 30.10). Furthermore, a range of approximately 17‰ (δ11B = -9.43 ~ -28.43 ‰) variation in δ11B is consistent with published inorganic precipitation experiments. More investigations are still required to further confirm the potential contribution of temperature on calcitic δ11B.
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