Preliminary Study on Valley Variation in the Mountain Pass of Kumalake River of South Tianshan Mountain Since the Quaternary
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Abstract:
in the mountain pass of Kulamake River were used to investigate the valley variation in the area. The comprehensive analysis of geologic and geomorphologic data, such as tectonic development history, the characteristics of ancient riverbed sediment and its elevation based on the drill-hole data, and the terrace development elevation in the mountain pass of Kulamake River were used to determine the stable-erosive periods of the riverbed since the Quaternary, which was compared with the karst development characteristics in the study area to identify the vertical valley variation. The results indicated that there are were seven stable-erosive periods for the valley since during the Quaternary. According to the thermoluminescence dating analysis on the terrace sediments, the erosive rate of the valley was calculated, which showed that the valley has the fastest erosive rate of 8.2 m/ka before the time period of 70 to 80 ka. In addition, the valley continued to move to left side of valley during the valley erosion process.
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