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- W2363125756 abstract "The Jiuquan Basin is a reverse- fault- controlled basin in the north west part of the Hexi Corridor, a Cenozoic foreland basin system located in the northeastern margin of the Qinghai-Tibet Plateau. From the southwest to the northeast, the landforms in the Jiuquan Basin can be divided into three zones, i. e., the North Qilian Mountain, basin plain, and North Mountain. They are parallel with the active fault zones of NWW-SEE. The basin plain is around 2000 m alove sea level in the southwest and 1500 m above sea level in the northeast, which can be subdivided into three zones, i. e., the folded zone, the deep downwarped zone and the monocline zone. The present climate in this area is continental arid. The annual precipitation is only 86 mm in the Jiuquan Basin, but in the alpine zone of the Qilian Mountain over 4000 meters above sea level it can reach over 500 mm. The meltwater from the alpine zone is an important supply to the rivers. The Beida, Hongshuiba, Fengle and Maying Rivers, rising from the Qilian Mountain flow through the Jiuquan akin from south to north, and disappear in deserts to the north. The longitudinal profiles of the rivers have been obtained based on 7-10 transverse sections on each river. The longitudinal profiles of the rivers are affected by the faults. The fault in the front of the Qilian Mountains dislocated the terraces older than the T6 terrace around 40 ha BP, and the fault at the north front of the folded zone dislocated the terraces older than the T2 terrace. The river valleys are dissected into the Pleistocene gravel to the south of the fault in the front of the Qilian Mountain. The beginning of the highest terrace (T15) development represents a transition from aggradation to degradation in this area. Based on the average dissecting rate of the Hongshuiba River, it is deduced that the T15 was formed around 160 ha BP. The rivers incised through the gravel of the older fans between the F1 and F2 faults also reveal a transition from aggradation to degradation around 40 ha BP. These two transitions may represent two periods of strong tectonic movement. The two fans have been formed by each river at the front of the Qilian Mountains. The older fan is larger and closer to the Qilian Mountain. They are controlled by the fault in the front of the Qilian Mountain and the fault in the north boundary of the folded zone in the Jiuquan Basin. The movement of the latter fault caused the older fan to be dissected, and the younger fan to be deposited more towards the centre of the Jiuquan Basin." @default.
- W2363125756 created "2016-06-24" @default.
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- W2363125756 date "2000-01-01" @default.
- W2363125756 modified "2023-09-25" @default.
- W2363125756 title "RESPONSE OF ALLUVIAL LANDFORMS TO NEOTECTONICS IN THE JIUQUAN BASIN, GANSU, NORTHWEST CHINA" @default.
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