https://scholars.lib.ntu.edu.tw/handle/123456789/37177
標題: | 台灣西部第三系之層序地層學研究(II) | 其他標題: | Sequence Stratigraphic Analysis of the Tertiary Strata in Western Taiwan (2) | 作者: | 鄧屬予 | 關鍵字: | 台灣西部;第三系;層序地層;漸新統- 下部中新統;中上中新統;剖面檢驗;Western Taiwan;Tertiary;Sequence Stratigraphy;Oligocene- Lower Miocene;Middle and Upper Miocene | 公開日期: | 2000 | 出版社: | 臺北市:國立臺灣大學地質科學系暨研究所 | 摘要: | 第三系廣泛出露於台灣西部的雪山山脈和西 部麓山帶,並隱伏於海岸平原和台灣海峽的地下地質,是濱海-淺海相的堆積層。根據第一年的研究計畫成果顯示,在台灣北 部與中部地區的三條露頭剖面與三口鑽井資料 中,漸新統至下中新統多屬於遠濱相的沈積物, 沈積環境與地層厚度呈現由西向東變深與增厚的 變化,並可分為8 個沈積層序。中上中相統仍以遠 濱相沈積物為主,也含有顯著的海岸平原與近濱 相的沈積物,不論是從北到南或由西到東,岩相 的側向變化方面則顯得比較一致,並可分為10 個 沈積層序。此外,在台灣中部,上中新統具有顯著的沈積間斷,以致缺失部分沈積層序。在本年度中,本研究利用台灣西北部的出磺 坑剖面與另2 口鑽井資料,檢驗這些沈積層序。雖 然這些第三系在本區的厚度急劇增加,使得漸新 統多深埋於地下地質之中,或出露不完整;不 過,在4 個地質剖面中,中新統沈積層序同樣具有 顯著的沈積相變化,並且顯得更為完整連續,共 可辨識出12 個沈積層序,並且可對比第一年度所建立的層序地層架構。綜合二年度的研究成果,本研究發現現有的 層序地層架構可以獲致初步的確立。這些有趣的 結果值得進一步擴大應用範圍。取得更多剖面的 驗證,並進一步嘗試沈積深度的定量分析,以及 海水面變化的重建,以完竣台灣西部第三系的層 序地層系統,進行全面的劃分-驗證-地史描述等深入分析。 In western Taiwan, Tertiary strata are widely outcropped in the Hsueshan Range and Western Foothills, and distributed in the subsurface geology of the Coastal Plain and Taiwan Strait. They were deposited in a coastal to shallow shelf environment. According to the results of the first-year research in 3 outcrop sections and 3 electric well logs, the facies and thickness of the Oligocene and Lower Miocene strata drastically deepen and thicken eastwards, respectively. Eight depositional sequences are identified in these offshore-dominated facies successions. The Middle and Upper Miocene strata are likewise dominated by the offshore deposits and further characterized by the coastal plain and nearshore deposits. Their lateral facies changes are more consistent and widely observed both southwards and eastwards. Ten depositional sequences are identified in the faices successions. In central Taiwan, missing of some of the Upper Miocene sequences are discovered. During this year, the stratigraphic records of the Chuhuangkeng section and 2 well logs in northwestern Taiwan have been investigated to examine the vadility of the sequence stratigraphic scheme established in the previous year. The Oligocene sequences are not completely reocrded in these sections, because they are usually deep-seated in the subsurface geology or discontinuously outcropped. This is due to the drastic thickness increase of the Tertiary strata in this area. Nevertheless, the Miocene sequecnes are still distinguishable with similar facies and sequence characteristics. Twelve depositional sequences are identified and comparable to those discovered in the first year. Based on the researches in the past two years, it is believed that the new-established sequence stratigraphic scheme is successfully examined and found appliciable. These interesting findings call for further studies on more stratigraphic sections, quantitative depositional depth evaluation and sealevel reconstruction. These advancesd analyses are helpful to improve the sequence stratigraphic scheme with the details of straitgraphic division, application and geohistory reconstruction. |
URI: | http://ntur.lib.ntu.edu.tw//handle/246246/11747 | 其他識別: | 892116M002013 | 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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892116M002013.pdf | 52.06 kB | Adobe PDF | 檢視/開啟 |
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