The uplift of orogenic plateaus has been assumed to be coincident with the fluvial incision of the gorges that commonly cut plateau margins. The Mekong River, which drains the eastern Qiangtang Terrane and southeastern Tibetan Plateau, is one of the ten largest rivers in the world by water and sediment discharge. When the Mekong River was established remains highly debated—with estimates that range from more than 55 to less than 5 million years ago—despite being a key constraint on the elevation history of the Tibetan Plateau. Here we report low-temperature thermochronology data from river bedrock samples that reveal a phase of rapid downward incision (>700 m) of the Mekong River during the middle Miocene about 17 million years ago, long after the uplift of the central and southeastern Tibetan Plateau. However, this coincides with a period of enhanced East Asian summer monsoon precipitation over the region compared with the early Miocene. Using stream profile modelling, we demonstrate that such an increase in precipitation could have produced the observed incision in the Mekong River. In the absence of an obvious tectonic contribution, we suggest that the rapid incision of the Tibetan Plateau and the establishment of the Mekong River in the middle Miocene may be attributed to increased erosion during a period of high monsoon precipitation.
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The authors declare that all data supporting the findings of this study are available within the article and its Supplementary Information.
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We thank J. Dai for clarification of the sample elevations of the upper Mekong in his work, S. Ji for assisting with sampling, Z. Zhang for analytical help, and H. Geng for discussion. This work was financially supported by the National Key Research and Development Program of China (2016YFE0109500), the (973) National Basic Research Program of China (grant no. 2013CB956400), the National Natural Science Foundation of China (grant nos 41422204 and 41672157) and the US National Science Foundation (grant nos 1348005 and 1545859). M.D. was supported by Australian Research Council Discovery funding scheme (DP160102427) and Curtin Research Fellowship.
The authors declare no competing interests.
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Nie, J., Ruetenik, G., Gallagher, K. et al. Rapid incision of the Mekong River in the middle Miocene linked to monsoonal precipitation. Nature Geosci 11, 944–948 (2018). https://doi.org/10.1038/s41561-018-0244-z
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