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地质通报  2008 

雅鲁藏布江大峡谷的形成

, PP. 491-499

Keywords: 雅鲁藏布大峡谷,河流袭夺,释光定年

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Abstract:

通过对雅鲁藏布大峡谷流域地貌形成响应时间域的定量估算,大峡谷与上游河道特征的对比,以及大峡谷入口处河湖阶地的沉积分析和定年研究,结合构造研究的新进展和数值地貌分析成果,系统论证了雅鲁藏布大峡谷的形成。研究结果表明,现今的雅鲁藏布大峡谷与大峡谷上游的河道在大峡谷形成之前分属不同的河流体系,大约在距今30kaBP前后,原属于帕隆藏布江水系支流的扎曲―直白河段因溯源侵蚀,袭夺了位于现今直白河段上游的古雅鲁藏布江水系,使得此前向南经南伊沟(纳伊普曲)流出高原的古雅鲁藏布江与帕隆藏布江合二为一,雅鲁藏布大峡谷得以贯通和强烈的侵蚀下切,形成现今著名的大峡谷和大拐弯式样的流域结构。

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