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題名 | Radiocarbon Dates of River Terraces Alone the Lower Tahanchi, Northern Taiwan: Their Tectonic and Geomorphic Implications=大漢溪下游河階碳十四定年及其在構造與地形上之涵義 |
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作者姓名(中文) | 陳于高; 劉聰桂; | 書刊名 | 中國地質學會會刊 |
卷期 | 34:4 1991.10[民80.10] |
頁次 | 頁337-347 |
分類號 | 353.17 |
關鍵詞 | 下游; 大漢溪; 地形; 定年; 河階; 構造; 碳十四; |
語文 | 英文(English) |
中文摘要 | 大漢溪下游一帶之河階,依其比高及沈積特徵約可分為三類:高度最高,表層有紅土發育,為厚層礫石組成,且地形面分布較廣者,為高位紅土河階,如中壢桃園臺地,其比高在100公尺以上;位於現河床兩側分布較局限,呈岩床河階特徵者,為低位沖積河階,其比高約在10公尺-40公尺之間;最低一階,乃為現河谷氾濫沖積平原,其比高均不大於5公尺。本研究經詳細野外調查後,於各類河階中,均採得具代表性之碳化漂木標本,經碳十四定年分析,得知高位紅土河階發育於四萬七千年前至三萬年前;較高之低位沖積河階,發育於一萬八千年前左右;較低之低位沖積河階,發育於一萬一千年前。由河階發育的時間以及河階地形的特徵,也可推知古大漢溪大約於三萬年前在鶯歌附近,為古淡水河襲奪;另外,大漢溪下游一帶,自龔奪發生後即持續上升,大約一萬年前上升速率達到最快,之後又漸趨平穩。 |
英文摘要 | The depositional ages of some representative fluvial terraces along the lower Tahanchi have been determined by the radiocarbon method. The relative heights are 10 to 40 meters and the formation age is 11 Ka for the first-step lowest terraces, while they are 50 to 90 meters and 18 Ka for the second-step. The third-step terraces, which have lateritic soil on their tops, were formed between 47 ka and 30 ka. Chronologic and geomorphic evidence from the fluvial terraces indicate that the paleo-Tahanchi was pirated by the paleo-Tanshuiho at about 30 ka. The rates of crustal uplift of the lower Tahanchi area increased after that, reached its maximum value at about 10 ka, and then gradually decreased to the present-day state. |
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