geolmsuВЕСТНИК МОСКОВСКОГО УНИВЕРСИТЕТА. СЕРИЯ 4. ГЕОЛОГИЯMoscow University Bulletin. Series 4. Geology0579-9406Издательский Дом МГУ10.33623/0579-9406-2020-2-9-17geolmsu-226Research ArticleСтатьиАктивные современные разломы западного сегмента гор Цилиан (Северный Тибет)Active present faults of the Western segment of the Qilian Mountains (Northern Tiber)ЧжиданьЧэньZhidanChen

геологический факультет, кафедра динамической геологии, аспирант

chenzhidan188@163.comКороновскийН. В.KoronovskyN. V.

геологический факультет, кафедра динамической геологии, заведующий кафедрой, профессор

koronovsky@rambler.ruМосковский государственный университет имени М.В. ЛомоносоваRussian Federation20202804202002917Copyright © Чжидань Ч., Короновский Н.В., 20202020Чжидань Ч., Короновский Н.В.Zhidan C., Koronovsky N.V.Данная работа распространяется под лицензией Creative Commons Attribution 4.0.This work is licensed under a Creative Commons Attribution 4.0 License.https://vestnik.geol.msu.ru/jour/article/view/226

Горы Цилиан — северо-восточная граница Тибетского плато, поглощавшая сокращение земной коры и компенсировавшая его левосдвиговым смещением по разлому Алтынтаг. Детальное изучение геоморфологии речных долин на северном краю гор Цилиан показало, что с позднего плейстоцена скорость поднятия земной коры в северных отрогах гор Цилиан была больше, чем в их центральной части. В связи с расширением Тибетского плато между разломом Чанма и разломом Юмен образовался новейший пояс разломов и складок на северном краю гор Цилиан. В результате изучения высоты речных террас за последние 60 тыс. лет выявлено, что скорость вертикального смещения по разлому Чанма составляет 0,31±0,06 мм/год, а скорость горизонтального сокращения земной коры — 0,11±0,02 мм/год. Скорость вертикального смещения по наиболее северному разлому Юмен определена равной 0,33±0,02 мм/год, а скорость горизонтального сокращения земной коры — 0,53±0,03 мм/год. Активные разломы в западном сегменте северных гор Цилиан обусловливают 12% общего сокращения земной коры во всех горах Цилиан. Кроме того, скорость сокращения земной коры в зоне северного разлома гораздо больше, чем скорость внутри этих гор. Это указывает на то, что с позднего плейстоцена скорость поднятия северных гор Цилиан была больше, чем центральных.

The Qilian Mountains, as the northeastern margin of the Tibetan Plateau, absorbed the crustal shortening and accommodated the left-lateral displacement of the Altun Tagh fault. Detailed geomorphologic study of river valleys on the northern margin of the Qilian Mountains showed that since the late Pleistocene the crustal uplift rate of the northern Qilian Mountains has been greater than the central part. Due to the extension of the Tibetan plateau between the Changma fault and the Yumen fault the latest belt of faults and folds was formed on the northern margin of the Qilian Mountains. The study of the height of river terraces over the past 60 thousand years shows that the rate of vertical displacement along the Changma fault is 0,31±0,06 mm/a and its horizontal crustal shortening rate is 0,11±0,02 mm/a. The rate of vertical displacement along the northernmost Yumen fault is 0,33±0,02 mm/a and its horizontal crustal shortening rate is 0,53±0,03 mm/a. Active faults in the western segment of the northern Qilian Mountains account for 12% of the total crustal shortening in the Qilian Mountains. In addition, the crustal shortening rate of faults in the northern Qilian Mountains is much greater than the crustal shortening rate of faults inside the Qilian Mountains, which further indicates that since the Late Pleistocene the crustal uplift rate of the northern Qilian Mountains has been greater than the central Qilian Mountains.

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The authors declare that there are no conflicts of interest present.