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系統識別號 U0026-1202201810342500
論文名稱(中文) 利用鋰同位素探討敏督利颱風期間濁水溪流域風化來源的變化
論文名稱(英文) Lithium isotopes as proxy for weathering sources in Choshui River during typhoon Mindulle
校院名稱 成功大學
系所名稱(中) 地球科學系
系所名稱(英) Department of Earth Sciences
學年度 106
學期 1
出版年 107
研究生(中文) 陳晏欣
研究生(英文) Yen-Hsin Chen
學號 L46031154
學位類別 碩士
語文別 中文
論文頁數 57頁
口試委員 指導教授-游鎮烽
口試委員-黃國芳
口試委員-劉厚均
中文關鍵字 鋰同位素  矽酸鹽化學風化  颱風  風化來源  河流化學 
英文關鍵字 River chemistry  Silicate weathering  Typhoon  Li isotope 
學科別分類
中文摘要 矽酸鹽化學風化因為其過程會消耗大氣中的二氧化碳,為調節長期地球氣候的重要反應,因此瞭解風化行為以及風化來源的水岩反應為重要的課題。河流的水化學組成變化可提供來自水岩反應的訊息,因此為瞭解矽酸鹽風化的地質材料之一。河流逕流主要來源為降雨以及在流域地層中的水,這些水會持續和地層進行風化反應。一般時期和颱風期間的河水受到不同風化來源的貢獻,有些風化來源在一般時期可能對河水影響不大,直到暴雨或颱風等天氣事件才會進到河水中。為了能完整瞭解整個颱風時期河流溶解相的化學組成變化,本研究採取敏督利颱風時期每三小時以及颱風前後的臺灣濁水溪河水樣品,以及一般時期的土壤和地下水樣品。分析樣品的主量元素、微量元素和陰離子濃度以及鋰同位素值(δ7Li)。濁水溪颱風前河水溶解相δ7Li為+10.7 ~ +11.6‰,而颱風初期的δ7Li為+15.6 ~ +20.9‰,颱風後期δ7Li為+15.0 ~ +16.7‰。比較河水和地下水、土壤可交換相之間Sr/Na和Li/Na的關係,顯示颱風期間鋰的來源可能來自土壤和地下水的注入。進一步使用Rayleigh fractionation model評估颱風時期河水的δ7Li,由於不同風化來源所生成的次生礦物相差異會反應在δ7Li,結果顯示颱風初期受到土壤來源影響比較大,而颱風後期地下水影響變高。一般時期有些風化來源對河水沒有太大的影響,唯有在颱風所帶來的強降雨以及河水高流量的影響下才進到河水中。根據本研究使用鋰同位素值能夠初步區分這些來自不同風化來源的訊號。
英文摘要 Silicate weathering on Earth surface is a crucial processes in the long-term evolution of climate through the consumption of atmospheric CO2. River water chemistry could provide the information about weathering processes. River runoff is derived from precipitation, and water stored in the catchment which water-rock interaction continues happening. Extreme weather induced high river discharge would result the water stored in the catchment flow out and the chemical composition of the water recorded signal of weathering sources. With the aim to identify the contribution of sources during typhoon period and the water-rock interaction of weathering sources, the river samples were collected from Choshui River in Taiwan during Typhoon Mindulle, 2004 every 3hrs in this study. Besides, groundwater and soil samples were collected during normal flow period. The major, minor element concentrations and the Li isotopic compositions (δ7Li) of samples were determined. Because Li isotopes can reflect secondary minerals phase from different weathering sources. The δ7Li of dissolved load (δ7Lidiss) before the typhoon was +10.7 ~ +11.6‰. At the early stage of typhoon, the δ7Lidiss is +15.6 ~ +20.9‰ while it is +15.0 ~ +16.7‰ at the late stage. According to Sr/Na and Li/Na ratio of river, and other samples, and Rayleigh fractionation model calculation, these results showed that river may be effected by soil at the early stage of typhoon while the contribution of groundwater became higher at the late stage. These sources may have slight influence on the river chemistry at normal flow period, and have obvious influence only during typhoon period.
論文目次 摘要 I
Abstract II
誌謝 VII
目錄 VIII
表目錄 X
圖目錄 XI
第一章 緒論 1
1.1 鋰同位素地球化學行為 2
1.2 臺灣的河流特徵 4
1.3 研究目的 6
第二章 研究區域地質環境以及颱風事件 7
2.1 濁水溪流域地質環境 7
2.2 敏督利颱風事件 10
2.3 樣品採樣時間以及樣品處理 12
第三章 研究方法與原理 13
3.1 化學試劑與標準品 13
3.2 土壤和河流懸浮沉積物樣品前處理 13
3.2.1 土壤和懸浮沉積物全溶 13
3.2.2 土壤可交換相 14
3.3 管柱化學分離法 15
3.4 元素及同位素分析技術 19
3.4.1 元素濃度量測 19
3.4.2 鋰同位素值測量 20
第四章 結果 26
4.1 主量元素和陰離子隨流量變化趨勢 27
4.2 鋰元素比值變化趨勢 30
4.3 鋰同位素變化趨勢 32
第五章 討論 35
5.1 濁水溪溶解相鋰來源 35
5.1.1 大氣源輸入 35
5.1.2 岩石風化貢獻 35
5.2 鋰同位素反應不同水源注入 38
5.2.1 特定來源影響河水鋰同位素 42
5.3 颱風事件對於不同風化來源注入流域的影響 – 以鋰同位素示蹤 45
第六章 結論 46
參考文獻 47
附錄 53

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