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題 名 | Holocene Climatic River Terraces in an Active Tectonic-Uplifting Area, Middle Part of the Coastal Range, Eastern Taiwan=花東海岸中段地區之全新世氣候性河階 |
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作 者 | 謝孟龍; 賴慈華; 劉平妹; | 書刊名 | 中國地質學會會刊 |
卷 期 | 37:1 1994.01[民83.01] |
頁 次 | 頁97-114 |
分類號 | 359.274 |
關鍵詞 | 花東海岸; 全新世; 河階; 氣候性河階; Holocene; River terrace; Climate; Coastal Range; Eastern Taiwan; |
語 文 | 英文(English) |
中文摘要 | 由於花東海岸的快速地殼隆升,一般認為發育其間的河流當 以下切為主;然而於長濱至成功一帶,加積性的河階卻普遍存在 。在長濱、烏石鼻間的河系以及三仙溪、新港溪等河系中發育了 一至二階延續良好的加積性河階,並常成對發育。其中,水流營 力逐次加積而成的礫石層厚達20-30米,顯示出一個不同於下蝕 的河階發育環境。在此加積性河階之下,因河流之繼續下切,發 育了數階規模較小的侵蝕性河階,顯示加積結束後河流的逐次下 切至今。 在三仙溪河階剖面中,加積的礫石層與底岩接觸面上漂木定 年為5080±50年前。考慮全新世中期以來,全球海水面並無大幅 度的波動,且在此時距內陸地快速隆升的趨勢,該河階生成時似 無河流侵蝕基準面上升的條件。這侵蝕--加積--再侵蝕的現象遂 可能起因於氣候引起的河流水量及沉積物供應量的變化。 在地形上,這兩階主要加積性河階於河口地區大部分皆能與 全新世主要海階對比;而在年代上,長濱以北地區所發育海階定 年結果亦為大約五千年前。河階與海階在地形、時代上的吻合似 乎暗示本區海階的成因亦與當時的氣候環境有關。因此,即使在 此低緯度地區,構造快速隆升的背景下,氣候因素對於全新世地 形的演育仍然伴演著不可忽略的角色。 |
英文摘要 | Even in a rapidly tectonic uplifting setting-the middle part of the Coastal Range between Changpin and Chengkung-fill terrace is not a local phenomenon. One or two levels of well extended fill terraces have developed in river systems between Changpin and Wushihpi, the Sanhsien River and Hsinkang River systems. They consist of 20 to 30 m thick water-lag gravels overlying bedrock straths and occur as paired terraces in some places. Below the fill terraces, minor fill-cut or strath terraces are commonly developed, indicating the subsequent river incision after aggradation. One beginning of the river aggradation in the Sanhsien River Basin is dated by the C�喓ethod as 5080±50 yr.B.P.. Because sea level has been relatively stable compared with the uplift land since then, this aggradation, appearing as a reversal of long-term tectonically induced downcutting, is ascribed to the climatic change. Thus, it is worth noting that even in this low latitude, active tectonic-uplifting setting, the climatic factor can't be neglected when the issue about landform evolution is being considered. |
本系統中英文摘要資訊取自各篇刊載內容。