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題名 | Sedimentary History of the Taipei Basin With Constraints from Thermoluminescence Dates=由熱螢光年代來看臺北盆地之沈積史 |
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作者 | 魏谷; 陳于高; 劉聰桂; | 書刊名 | 中國地質學會會刊 |
卷期 | 41:1 1998.02[民87.02] |
頁次 | 頁109-125 |
分類號 | 351.29 |
關鍵詞 | 熱螢光年代; 臺北盆地; 沈積史; 氧同位素階; Thermoluminescence date; Taipei basin; Sedimentary history; Oxygen isotope stage; |
語文 | 英文(English) |
中文摘要 | 本研究分析了位於臺北盆地西側五股岩心中深度為352m及156m處之兩個熱螢光 年代,由這兩個年代再配合原有地層資料討論了最後數十萬年以來臺北盆地的沈積史與全球 海平面變化的關鍵性討論。臺北盆地中最下部之板橋層大約於氧同位素第八階至第七階時開 始沈積。其上之五股層的下部粗顆粒沈積形成於氧同位素第六階時。而五股層上部之較細粒 沈積物則是氧同位素第五階時高海水面且為濕潤氣候的產物。以一假整合覆於五股層之上的 景美礫石層應形成於極乾燥且海水面較低的氧同位素第二階,因為海水面低使得該時期之侵 蝕能力增加,造成原本於氧同位素第三階級第四階的沈積可能被侵蝕怎殆盡。臺北盆地中最 上部之松山層則是形成於最後氧同位素第一階之海進。臺北盆地長期以來以及最近一萬年較 短時段中之沈降速率據推算均至每年一至二公釐上下。再由這個平均沈降速率推知臺北盆地 開始接受沈積的時間不老於三十萬年前,另外,於五股井中深度220m開始出現之紋泥層亦 可由上述沈降速率的推算得知其開始年代約二十萬年。作者相信這紋泥層的出現應為大屯火 山群最後一期火山噴出的火山碎屑岩封阻了盆地的出口,使之變成一安靜的湖泊之故。 |
英文摘要 | Two thermoluminescence (TL) ages, i.e., 90±8ka and 220±66ka, were determined for core samples collected from the depths at -156 m and -352 m in the Wu-ku borehole in the western Taipei Basin. The two new dates and other stratigraphic data make possible correlation of the sedimentary history of the Taipei Basin with the global sea-level change for the past several hundred thousand years. The lowest stratigraphic unit in the Taipei Basin, the Banchiao Formation, started to deposit in the international scale of Stage 8 to Stage 7. The lower part of the subsequent Wu-ku Formation, composed of coarser sediments, was formed in Stage 6. The fine sediments of the upper Wu-ku Formation is the product of Stage 5, a humid and high sea-level period. The Chingmei Formation, a gravel sequence disconformably overlying the Wu-ku Formation, is believed to be developed in Stage 2, a very arid and low sea-level period. Due to its high erosional potential caused by the low sea-level stand in Stage 2, the previous deposits formed in Stages 3 and 4 might have been eroded away. The uppermost unit, the Sungshan Formation, was formed in the last transgressional period, Stage 1. The long-term and short-term subsidence rates of the basin are both found to be 1-2 mm/yr. On the basis of this mean subsidence rate, the oldest deposits of the Basin can be calculated as not older than 300 ka. In addition, the beginning time of deposition of the rhythmic mud layers at the depth of -220 m is estimated to be 200 ka. These beds are believed to represent deposition in a calm lake which was dammed up probably by the latest pyroclastics from the Tatun Volcanic Group. |
本系統之摘要資訊系依該期刊論文摘要之資訊為主。