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題名 | Depositional Mechanism of the Fukang Sandstone, Lichi Melange, Eastern Taiwan=利吉層中富崗砂岩之沈積機制研究 |
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作者 | 宋國城; | 書刊名 | 中國地質學會會刊 |
卷期 | 34:3 1991.07[民80.07] |
頁次 | 頁173-197 |
分類號 | 358.5 |
關鍵詞 | 利吉層; 沈積; 富崗砂岩; |
語文 | 英文(English) |
中文摘要 | 富崗砂岩,利吉層中最大的沈積岩塊,由一系列具有特殊沈積構造層序的濁流岩組成。最顯著的沈積現象就是平行紋理與交錯紋理反覆出現,伴隨著全然相反的古水流方向指示在很短時間內發生相同的沈積機制。而且砂岩粒度之連續性也指示它的沈積作用係由一次濁流造成。因此,富崗砂岩很可能是由反彈之濁流在一個狹窄封閉的盆地中沈積而成,或者是濁流受到海底地形高區之阻擋反向回流之沈積。這些沈積場所很可能是大陸斜坡上的小盆地或者是海溝。 |
英文摘要 | The Fukang Sandstone, a giant exotic block in the Lichi melange, comprises a series of turbiditic sequences with several unusual sedimentary features. The most remarkable of which are evidence for repeated occurrence of the same depositional conditions without great separation in time, as, for example, the alternations of B and C divisions associated with opposite current flow directions. In addition, continuous grain size distribution indicates the deposition evoked from a single event of turbidity current. Thus we may infer that the Fukang Sandstone may have been deposited by the reflected turbidity current flowing in a confined basin or rebounding from a bathymetric barrier. A continental slope basin or trench may be possible sites for deposition of the Fukang Sandstone. |
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