摘要
Geologic and geomorphologic evidence from the Shaluli Mountain indicates that the planation surface that formed in the Late Tertiary disintegrated during the Late Pliocene-Early Quaternary. At the same time, rift ba- sins appeared on some parts of the planation surface, and began to accumulate fluvial-lacustrine sediment. These are interpreted as being the response of this region to Phase-A of the Qingzang Tectonic Movement. After this, the Shaluli Mountain continued to rise in several pulses. Faulting and incision by some large tributaries of the Jinsha and Yalong Rivers resulted in several rift river valleys and the earliest terraces. Generally, the planation surface in this region had been uplifted to about 3500—3700 m a.s.l. no later than 550—600 ka BP, after the Kunlun-Huanghe Tectonic Move- ment, and coupled with global glacial climate, and resulted in the earliest glaciation recognized so far in the Hengduan Mountains. At the same time, loess was deposited in the Ganzi area of the northern Shaluli Mountain. During the last glacial period, the Shaluli Mountain approached its present altitude and developed several large ice caps, such as the Daocheng Ice Cap and Xinlong Ice Cap, as well as several huge valley glaciers. These paleoglaciers produced some of the most spectacular glacial topography on the Tibetan Pla- teau.
Geologic and geomorphologic evidence from the Shaluli Mountain indicates thatthe planation surface that formed in the Late Tertiary disintegrated daring the Late Pliocene-EarlyQuaternary. At the same time, rift basins appeared on some parts of the plantation surface, andbegan to accumulate fluvial-lacustrine sediment. These are interpreted as being the response of thisregion to Phase-A of the Qingzang Tectonic Movement. After this, the Shaluli Mountain continued torise in several pulses. Faulting and incision by some large tributaries of the Jinsha Yalong Riversresulted in several rift river valleys and the earliest terraces. Generally, the planation surfacein this region had been uplifted to about 3500-3700 m a.s.l. no later than 550-600 ka BP, after theKunlun-Huanghe Tectonic Movement, and coupled with global glacial climate, resulted in the earliestglaciation recognized so far in the Hengduan Mountains. At the same time, loess was deposited in theGanzi area of the northern Shaluli Mountain, During the last glacial period, the Shaluli Mountainapproached its present altitude and developed several large ice caps, such as the Daocheng Ice Capand Xinlong Ice Cap, as well as several huge valley glaciers. These paleoglaciers produced some ofthe most spectacular glacial topography on the Tibetan Plateau.
作者
ZHOU Shangzhe1,2, XU Liubing1, CUI Jianxin1, ZHANG Xiaowei1 & ZHAO Jingdong1 1. National Laboratory of Western China’s Environmental Systems of Ministry of Education of China and Department of Geography, Lan- zhou University, Lanzhou 730000, China
2. Department of Geography, South China Normal University, Guang- zhou 510631, China
基金
the National Natural Science Foundation of China(Grant Nos.49971080 , 40371013)
the National Key Basic Research Project(Grant No.G1998040815)
