https://scholars.lib.ntu.edu.tw/handle/123456789/45087
標題: | 季節性硫酸鹽還原與硫化礦物物種之變化 | 作者: | 林曉武 | 公開日期: | 2001 | 出版社: | 臺北市:國立臺灣大學海洋研究所 | 摘要: | 本研究主要在瞭解大鵬灣內沈積物之硫酸鹽還原,於研究區域採集12 個岩 心。分析項目包括間隙水硫酸鹽、氯離子、硫化氫濃度。沈積物有機探含量、AVS 與Pyrite-S 濃度,活性鐵與無機探含量。 研究結果顯示大鵬灣沈積環境為無氧硫酸鹽還原環境,沈積物內進行高速之 硫酸鹽還原,不僅造成沈積物內大量之硫礦物化之累積而且大量之硫化氫亦正擴 散進入上層水體,故而大鵬灣外部海水之交換亦密切控制大鵬灣之硫酸鹽還原。 硫酸鹽藉著交換作用補充入灣內,部分內側區域沈積物因補充不及且有高量之有 機碳含量下而限制了大鵬灣內側沈積物之硫化礦物之形成。 區域性硫酸鹽還原之變化,主要受有機碳含量與硫酸鹽之供應所影響。大鵬 灣沈積物內富含有機碳,應屬淡水環境,但從其鹼水/半鹼水特性則顯示硫化物 之偏低應是缺乏活性鐵所導致。 This research studied sulfate reduction and iron sulfide mineral formation in the DaPan Bay sediment. Twelve cores were sampled in the study area. Pore water sulfate, chloride, dissolved sulfide and sediment organic carbon, inorganic carbon, AVS, pyrite-S, reactive iron were analyzed. The result demonstrated that sulfate reduction and iron sulfide mineral formation predominate in the study DaPan Bay sediment. Rapid sulfate reduction and high concentrations of dissolved sulfide as well as AVS and pyrite-S were observed in the anoxic DaPan Bay sediments. Flushing of seawater from the only inlet constantly provided oxic seawater as well as sulfate into the bay. Regional variations of sulfate reduction and sulfide mineral formation were also observed. Inner bay sediments were characterized by high concentrations of organic carbon, dissolved sulfide, AVS and pyrite-S. Away from the inner bay, organic carbon concentration decreased rapidly as well as dissolved sulfide in the pore water. Low reactive iron was the primary limiting factor for the observed high C/S ratios in the DaPan Bay sediment. |
URI: | http://ntur.lib.ntu.edu.tw//handle/246246/14780 | 其他識別: | 892611M002042 | Rights: | 國立臺灣大學海洋研究所 |
顯示於: | 海洋研究所 |
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892611M002042.pdf | 1.32 MB | Adobe PDF | 檢視/開啟 |
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