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-sin...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.展开更多
基金the National Natural Science Foundation of China(Grant Nos.49971080,40371013)the National Key Basic Research Project(Grant No.G1998040815)
文摘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.
