https://scholars.lib.ntu.edu.tw/handle/123456789/37479
標題: | 台灣南部中上中新統層序地層學研究(II) | 其他標題: | Sequence Stratigraphic Study of the Middle-Upper Miocene Strata in Southern Taiwan (II) | 作者: | 鄧屬予 | 關鍵字: | 台灣南部;中上中新統;層序地 層;全球海水面;大地構造;Southern Taiwan;Middle-Upper Miocene;Sequence Stratigraphy;Eustasy;Tectonics | 公開日期: | 2003 | 出版社: | 臺北市:國立臺灣大學地質科學系暨研究所 | 摘要: | 出露於台灣南部的麓山帶與恆春半島 的中上中新統,也向西隱伏於海岸平原和台 灣海峽,是濱海-淺海相的堆積層。 根據第二年的研究顯示:在屏東的三 條露頭剖面中,中上中新統底部多屬於外陸 棚-棚緣相的沈積物,中上部則以濱面與內 陸棚相為主,沈積環境與地層厚度呈現由北 向南變深與增厚的變化,大致可分為4 個沈積 層序。這些層序可以對比第一年度嘉義-高 雄地區5 個層序中的上部4 個層序。 綜合二年來的研究成果,台灣南部中 上中新統的整體外型是一個由西北向東南變 深、變厚的楔形體。這些矽質碎屑沈積岩在 堆積過程至少經歷過4 次海進海退循環,沈積 環境在陸棚邊緣、大陸棚、濱海與陸相環境 之間變動。這些環境的變化深受全球海水面 升降的影響,堆積物的厚度變化則與當時大 陸邊緣的張裂活動有關。 In southern Taiwan from Pingung to Hengchung, middle-upper Miocene strata are widely outcropped in the Western Foothills and Central Range and extend westward in the subsurface of the Coastal Plain and Taiwan Strait. These silisiclastic strata are mainly coastal to shallow marine deposits. Based on the results of the second-year research in 3 outcrop sections in the Pingtung area, the lower part of the studied strata is dominated by outer shelf and shelf edge facies, while the upper part is composed of coastal and inner shelf facies. The depositional environment drastically deepen southwards, whereas the thickness decrease. Four depositional sequences are identified in these marine successions. The sequences can be compared with the upper 4 of the 5 sequences identified in the Chia-I and Kaohsiung area in the last-year study.The chronostratigraphic framework can be delineated by nannofossil and planktic foraminiferal biozonations. Summarizing the results of the last 2 years, the middle-upper Miocene in southern Taiwan appears as a siliciclastic wedge that deepens and thickens toward the east and south. During its accumulation, the wedge displays at least 4 depositional cycles shifting from the shelf edge, shelf, shoreline to terrestrial environments. Owing to the significant environmental changes, vast area in the present-day Taiwan Strait and Coastal Plain had occasionally been subaerial exposed. The depositional cycles are believed to be related to the global sea-level fluctuations, while the distinct thickness variations dominated by the extensional tectonics of the continental margin. |
URI: | http://ntur.lib.ntu.edu.tw//handle/246246/11812 | 其他識別: | 912116M002016 | 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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912116M002016.pdf | 129 kB | Adobe PDF | 檢視/開啟 |
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