https://scholars.lib.ntu.edu.tw/handle/123456789/37492
標題: | 「地震及活斷層研究」-地震地質─車籠埔斷層活動相關之光螢光法年代學研究(2/2) | 其他標題: | OSL geochronological study on relevant problems of the Chelungpu fault | 作者: | 陳于高 | 關鍵字: | 地震地質;活斷層;光螢光法;槽溝;河階;earthquake geology;active fault;OSL;trench;river terrace | 公開日期: | 2004 | 出版社: | 臺北市:國立臺灣大學地質科學系暨研究所 | 摘要: | 本計劃著眼於地震地質與活斷層運動學之整 合型計畫對於地質年代的需求,所採用之方法以90 年代快速發展之光螢光定年法,希望藉此方法於晚 更新世年代範圍中的優勢,延長碳十四法所不能達 到的極限,另外亦可補足無法連續取得樣本的困擾。地震地質與活斷層運動學研究的主題,不外 乎同震活斷層再發週期的研究,以及活斷層長期之 滑移速率的探討,這些與時間相關的課題,都需要 有良好的年代學研究來加以配合,傳統上碳十四定 年法是最主要的手段,但其使用上有諸多限制,例 如標本取得不易及年代上限僅及五萬年,都不足以 滿足相關研究的需要。光螢光定年法近年來積極的 發展,可以改善年代學在上述問題方面的缺憾,如 它的定年上限至少可達十五萬年之久,所使用樣本 為最常見的石英與長石顆粒,又不似熱螢光法受限 於環境易有曬退不完全的疑慮,再加上分析效率 高,相對成本較低,其可行性自不在話下。 本計劃初步規劃優先配合古地震研究中槽溝 開挖的工作,輔以河階之定年並配合其他地形學研 究以達整合之目的,其中槽溝的開挖以車籠埔斷層 沿線為主要目標,河階定年則是由北往南逐年進 行,保守估計至少有一百五十個光螢光年代可於三 年執行計劃期間完成,希望能對地震地質與活斷層運動學的研究,做出具體的貢獻。 This proposal will focus on age determination, which is eagerly needed in the integrated project “Earthquake Geology and Kinematics of Active Faults”. Adopted method is Optical Stimulated Luminescence (OSL) method, which has been rapidly developed during 90’s. Hopefully the advantage of this method in dating limit can help us extending our knowledge into much older past. It is also expected that the advantage in sampling would fill up age void during late Pleistocene. The major subjects on earthquake geology and kinematics of active fault are recurrence interval of coseismic faulting and long-term slip rate. These time related subjects need to cooperate with useful geochronological study. In the past, radiocarbon method was commonly used; however, its short dating limit and restricted sample requirement made widely using unable. On the other hand, recent progress on OSL method seems able to make up these deficiencies. Its oldest limit can reach 150ka. Its dating materials are common minerals that are widely distributed elsewhere in sediments. Furthermore, not like TL method, it is applicable to sediments collected from different sedimentary environments. One more advantage worthwhile to mention is its highly efficient analyzing processes. It further results in a relative low cost. All these above-mentioned advantages indicate that the OSL method is unequivocally useful. During the coming year, this project plans to firstly collaborate with the other principal investigators who are working paleoseismology, the trenching excavation along the chelungpu fault. The second goal is to work on samples collected from river terraces, which can provide more age data to decipher the neotectonics in central Taiwan. Hopefully, this project can provide at least 150 OSL ages in coming three years to help understanding more details regarding to earthquake geology and kinematics of active faults in central Taiwan. |
URI: | http://ntur.lib.ntu.edu.tw//handle/246246/11826 | 其他識別: | 912119M002024 | Rights: | 國立臺灣大學地質科學系暨研究所 |
顯示於: | 地質科學系 |
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912119M002024.pdf | 380.03 kB | Adobe PDF | 檢視/開啟 |
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