중국 신장 옌치분지 북부의 허징선상지 지형발달

초록

The Hejing alluvial fan is located on the northern part of the Yanqi Basin and the southern foothills of the southeastern Tianshan Mountains in Xinjiang, China. This study aimed to clarify the process of the fan development by analyzing the sedimentary facies of 18 outcrops in the field. We also examined how tectonic movement influenced the geomorphic development of the fan. According to the sedimentary characteristics of general alluvial fans, it was determined that the Hejing alluvial fan was shaped by fluvial processes and debris flows originating from gravitational action. There were multiple factors affecting the alluvial fans, such as tectonic movement and climate change. The tectonic movement of the Hejing reverse fault-fold zone in front of the southern foothills of the Tianshan Mountains has affected the geomorphic development of the the Hejing alluvial fan. After the Huangshui river eroded the anticline and passed through the water gap, a secondary alluvial fan formed on the southern side of the anticline of the Hejing reverse fault-fold zone. Later, according to the tectonic movement of the fault-fold zone, the Huangshui river moved eastward along the direction of the anticline development. Therefore, the secondary alluvial fans of the Hejing alluvial fan by the Huangshui river developed in sequence.

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