Evolution of drainage systems and its developing trend in connection with tectonic uplift of Eastern Kunlun Mt. |
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Authors: | Chang’an Li Hongfu Yin Glingwen Yu |
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Institution: | (1) Faculty of Earth Sciences, China University of Geoscience, 430074 Wuhan, China;(2) China Geological Survey Bureau, 100812 Beijing, China |
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Abstract: | The Eastern Kunlun Mt. had been subjected to uplift together with the Qinghai-Xizang (Tibet) Plateau before the Early Pleistocene,
and yet the Mt, did not protrude out of the Plateau surface. During that period lakes spread all over the studied region,
with the drainage systems being all short rivers flowing into the lakes. At the end of the Early Pleistocene, intensive tectonic
uplift led to the rising of the Eastern Kunlun Mt. and made the Mt. protrude onto the Plateau surface. As a result, a fault
depression valley formed extending nearly from west to east along the fault belt of the Southern Kunlun Mt. Lakes in this
region died out, surface runoffs joined into the valley of the Southern Kunlun Mt. resulting in a large river streaming nearly
from west to east. Around 150 kaBP, because of the strong differential movement, rivers, such as the Jialu River and the Golmud
River, retrogressively eroded seriously, cutting through the Burhan Budai Mt. Then they pirated the large river and divided
it into four portions. Owing to the uplift of the Eastern Kunlun Mt., strongly retrogressive erosion of the upper reaches
of the Jialu River has made the watershed of the Buqingshan Mt. migrate 6–10 km southward since Holocene. At present, it remains
a stronger trend of retrogressive erosion developing upward to the basin of the Yellow River Source and it seems that the
Jialu River is scrambling for the streamhead of the Yellow River. |
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Keywords: | Eastern Kunlun Mt drainage systems tectonic uplift retrogressive erosion Quaternary |
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