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首页> 外文期刊>Journal of Asian earth sciences >Geomorphic constraints on Middle Yangtze River reversal in eastern Sichuan Basin, China
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Geomorphic constraints on Middle Yangtze River reversal in eastern Sichuan Basin, China

机译：四川盆地东部长江中游逆转的地貌约束

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摘要

The Yangtze, the longest river in Asia, was hypothesized to be assembled through a series of Cenozoic capture events, such as the reversal of Middle Yangtze River and the capture of Upper Yangtze River, but the history remains largely unknown. Here, we present new geomorphic observations in the structural context of the eastern Sichuan Basin, namely the Eastern Sichuan fold belt, and identify an important drainage divide along the "midline" of this arc-shape fold belt. Based on longitudinal profile analysis, we find that the river capture events more likely occurred in the syncline valleys of low-relief landscape. Our results yield a new perspective on Middle Yangtze River reversal, and we propose that the "midline" drainage divide, rather than the Three Gorges, was the starting site of Middle Yangtze River reversal. In this manner, the reversal could have been accomplished by a sequence of river reversal over range-parallel segments in syncline valleys with less impact on the pre-existing drainage system in eastern Sichuan Basin.
机译：据推测，长江是亚洲最长的河流，它是通过一系列新生代捕获事件集结起来的，例如长江中游的逆转和长江上游的捕获，但历史仍然未知。在这里，我们介绍了川东盆地（即川东褶皱带）的构造背景下的新地貌观测结果，并确定了沿该弧形褶皱带“中线”的重要排水沟。基于纵向剖面分析，我们发现河流捕获事件更可能发生在低浮雕景观的向斜山谷中。我们的研究结果为长江中游逆流提供了新的视角，我们认为“中线”排水沟而不是三峡是长江中游逆流的起点。以这种方式，可以通过沿斜向河谷的范围平行段上的一系列河流逆转来完成逆转，而对川东东部已有的排水系统的影响较小。

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