The Active Modern Faults of the Western Segment of the Qilian Mountains (North Tibet),Moscow University Geology Bulletin

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The Active Modern Faults of the Western Segment of the Qilian Mountains (North Tibet)
Moscow University Geology Bulletin ( IF 0.3 ) Pub Date : 2020-08-31 , DOI: 10.3103/s0145875220030035
Chen Zhidan , N. V. Koronovskii

Abstract—

The Qilian Mountains, at the northeastern border of the Tibetan Plateau, absorbed crustal shortening and accommodated it with a left-lateral displacement along the Altyn Tagh fault. A detailed geomorphological study of river valleys on the northern edge of the Qilian Mountains showed that since the late Pleistocene the rate of crustal uplift in the northern spurs of the Qilian Mountains has been greater than in their central part. Due to the extension of the Tibetan plateau between the Changma and Yumen faults, a new fault-and-fold belt formed on the northern edge of the Qilian Mountains. As a result of studying the changes in heights of river terraces over the years last 60 ka, it has been found that the vertical displacement rate along the Changma fault was 0.31 ± 0.06 mm/yr, and the rate of horizontal crustal shortening was 0.11 ± 0.02 mm/yr. The vertical displacement rate along the northernmost Yumen fault has been determined to be 0.33 ± 0.02 mm/yr and the rate of the horizontal crustal shortening is 0.53 ± 0.03 mm/yr. Active faults in the western segment of the northern Qilian Mountains account for 12% of the total crustal shortening in the entire Qilian Mountains. In addition, the rate of the crustal shortening in the northern fault zone is much greater than the rate of shortening within these mountains. This indicates that since the Late Pleistocene the rate of uplift for the northern Qilian Mountains has been greater than that of the central Qilian Mountains.

更新日期：2020-08-31

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