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完整後設資料紀錄
DC 欄位 | 值 | 語言 |
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dc.contributor.advisor | 王珮玲 | |
dc.contributor.author | Yun-Chun Wang | en |
dc.contributor.author | 王韻淳 | zh_TW |
dc.date.accessioned | 2021-06-17T06:34:26Z | - |
dc.date.available | 2020-08-21 | |
dc.date.copyright | 2018-08-21 | |
dc.date.issued | 2018 | |
dc.date.submitted | 2018-08-16 | |
dc.identifier.citation | Berner, R. A., 1982, Burial of organic carbon and pyrite sulfur in the modern ocean; its geochemical and environmental significance. American Journal of Science, 282, 451-473.
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Journal of Earth System Science 123, 4, 905–921 莊釗鳴、謝凱旋、臧振華、鮑曉鷗、黃耀慶、盧詩丁、朱傚祖、劉彥求、林燕慧、陳柏村、黃志遠、姜彥麟 (2012),基隆和平島考古槽溝的海嘯沉積層初探,經濟部中央地質調查所100年度業務成果發表會手冊。 莊文星 (1999),台灣之火山活動與火成岩,國立自然科學博物館。 陳正宏 (1990),台灣之火成岩,經濟部中央地質調查局。 | |
dc.identifier.uri | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/72305 | - |
dc.description.abstract | 近年來諸多海嘯事件吸引世人關注,而地質紀錄保存著不為人知的古海嘯事件。過去的相關研究藉由已知的海嘯事件建立起對海嘯沉積物的初步認知,並與相似自然事件,如颱風、洪水做比較。由於古海嘯紀錄並無文字史料記載,因此前人分析古海嘯的指標,多數為沉積學相關特徵,但受到距海遠近與地形等影響,沉積特徵有時無法明確分辨,因此學界開始將目光轉向地球化學分析,希望能找到海嘯沉積物的化學特徵,進一步突破研究困境。地球化學分析著重於沉積物來源的特徵,因此本研究目標為以地球化學方法研究,結合沉積學分析,針對豐濱地區之海嘯事件層進行研究。
研究目標為豐濱沿海之沖積平原,其表面至 2 公尺深處,由粉砂夾細砂質沉積物所組成,其下為一厚度 30 公分至 1 公尺不等之海灘礫石層,更深處則為厚 6 公尺之稜角狀火成岩巨礫層。在細顆粒沉積層之中,部分區域可見一基質支持、中等圓度、淘選度差之火成岩與砂岩質礫石層,向陸地尖滅,被推測為海嘯事件層。在挖掘之槽溝中選擇五個垂直剖面採集沈積物,分析有機碳、無機碳、氮、硫含量和各種元素的相對含量,並分析粒徑,元素分析結果再佐以主成分分析進行探討。結果發現海嘯事件層有著較高比例的矽與鉻,推測矽源於火成岩風化殘留之石英和鄰近區域的八里灣砂岩層,鉻源自於水璉礫岩中的輝長岩所含的含鉻尖晶石,兩種元素的來源都必須透過海水搬運而來。隨事件層深入陸地,粒徑與上下層位無異,但在元素相對含量上依然保有特徵,因此地球化學分析在研究海嘯事件上有其擅長的地方,佐以沉積學特徵分析可得到良好的辨別事件能力。 | zh_TW |
dc.description.abstract | High energy events, such as tsunami, although occur episodically, are destructive over a wide range of geographic area, and often cause substantial casualties and/or property damages. With the aid of historical records and precise dating, the target tsunami deposits could be correlated over various spatial and temporal scales. This general concept and methodological framework is often challenged under the circumstance where historical records and typical tsunami sediments are fragmentary or absent. As marine sediments bear a variety of geochemical characteristics distinctive from terrestrial ones, geochemical methods would provide additional evidence to constrain the origin of the possible target sediments but have seldom been applied in Taiwan.
In this study, a marine terrace in Fongbin Area was chosen for investigation of geochemical characteristics of sediments that have been previously identified to archive a tsunami event. The terrace is composed of colluvial deposits, within which rounded and poorly sorted gravels with a thickness of 50 cm appear in the upper portion, fade away toward inland, and are interpreted to originate from a tsunami event. Particle size and elemental analyses indicated that the poorly soring tsunami deposits have higher Si and Cr content, which could derive from quartz and Cr-spinel. These two minerals may originate from Paliwan Formation and Suilien Conglomerate and were delivered by a tsunami event. The geochemical difference between tsunami and regular deposits decreases toward inland, but the characteristics still subsists. Apparently, geochemical evidence can give a clue to trace the target layer, even if the grain size and sorting cannot exhibit the feature of tsunami event. It seems that geochemical analyses can provide extra indicators to general features of tsunami deposits, while the difference of sediment source could be fully characterized. | en |
dc.description.provenance | Made available in DSpace on 2021-06-17T06:34:26Z (GMT). No. of bitstreams: 1 ntu-107-R04241303-1.pdf: 3271829 bytes, checksum: b164df7286a366bf44a7be3eaed4178a (MD5) Previous issue date: 2018 | en |
dc.description.tableofcontents | 致謝 i
摘要 ii ABSTRACT iii 目錄 v 圖目錄 vii 表目錄 ix 第一章 緒論 1 第一節 研究動機與目的 1 第二節 海嘯事件研究 3 第一項 沉積學特徵 3 第二項 地球化學特徵 5 第三項 台灣的古海嘯紀錄 6 第二章 研究方法 7 第一節 樣本採集 7 第一項 採樣地點描述 7 第二項 採樣槽溝描述 8 第三項 層位比對 8 第四項 採樣方法與基礎處理 8 第二節 沉積物分析 15 第一項 粒徑分析 15 第二項 沉積物之碳氮硫含量分析 16 第三項 X 光螢光分析 17 第四項 主成分分析 21 第三章 分析結果 22 第一節 粒徑分析 22 第一項 粒徑組成比例分析 22 第二項 淘選度 24 第二節 沉積物之碳氮硫含量分析 26 第三節 X 光螢光分析 30 第四節 主成分分析 33 第一項 標準化與主成分數量選取 33 第二項 EO 剖面PCA結果 35 第三項 SI 剖面 PCA 結果 37 第四項 剖面綜合分析 39 第四章 討論 41 第一節 以粒徑組成辨別事件層 41 第二節 沈積物碳氮硫含量比較 42 第一項 總有機碳、氮、碳氮比、總無機碳比較 42 第二項 硫含量與有機碳硫比值之比較 42 第三節 沉積物多元素相對含量辨別事件層與來源特性 43 第一項 元素相對含量變化之意義 43 第二項 主成分分析結果之意義 43 第四節 綜合討論 45 第一項 XRF 與沉積物碳氮硫分析結果討論 45 第二項 粒徑與地球化學分析結果討論 45 第三項 LD02 與 LD04、LD05 坑比對 46 第五章 結論 47 參考文獻 48 | |
dc.language.iso | zh-TW | |
dc.title | 海嘯沉積物之地球化學特性:花蓮豐濱地區之案例分析 | zh_TW |
dc.title | Geochemical characteristics of tsunami deposits: A case study from Fongbin area, Hualien | en |
dc.type | Thesis | |
dc.date.schoolyear | 106-2 | |
dc.description.degree | 碩士 | |
dc.contributor.oralexamcommittee | 林立虹,顏君毅,游能悌,蘇志杰 | |
dc.subject.keyword | 海嘯事件層,粒徑分析,元素分析,主成分分析, | zh_TW |
dc.subject.keyword | tsunami event,grain size analysis,elemental analysis,principal components analysis, | en |
dc.relation.page | 51 | |
dc.identifier.doi | 10.6342/NTU201803596 | |
dc.rights.note | 有償授權 | |
dc.date.accepted | 2018-08-16 | |
dc.contributor.author-college | 理學院 | zh_TW |
dc.contributor.author-dept | 海洋研究所 | zh_TW |
顯示於系所單位: | 海洋研究所 |
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