摘要
本文在多次实地考察的基础上,就南趣巴瓦峰地区山水地貌的形成及其对自然环境的影响作了初步总结,为今后征服南峰的登山活动和大峡弯丰富自然资源的开发和利用,提供一些科学依据。
Mt. Namjagbarwa, 7782 meters above sea level, is the highest in the East Himalayas and the piedmont belt was enclosed by Great Bend Gorge at the Yarlung Zangbo River. Mt. Namjagbarwa is a '△' shaped fault block with strong uplift speed. The great Bend Gorge at the Yarlung Zangbo River around Mt. Namjagbarwa is an antecedent valley adopted oneself to complex structure of arcuate circumstance. The geomorphological developing progress at Mt. Namjagbarwa region is very complex and ancient. During Precambrian period(the absolute age is about 749 million years)the area belonging to one part Of the Indian Plate was located in the upheaveldenudation region. Following the northward drifting of the continent thrusted under the Qinghai-Xizang Plateau this area had changed the northeast part of the Indian Plate and then the European-Asian and the Indian Plate connected together(the absoluted age is about 140 million years). Starting the Quaternary the neotectonics turned to intermittent uplift. The exogenic process of ice-age and intermittent age influenced the geomorphological developments and circumstance changes,especially, after the Middle Pleistocene because the crust lift in this area was arrived at the largest Mt.Namjagbarwa rose as a natural barrier.Meanwhile, the action of moisture passageway of the Great Bend Valley at the Yarlung Zangbo River got stronger and stronger.Its powerful influence changed the plateau climate, biological groups, ancient and modern human survival, glacial evolution and other phenomena of physical geology.
出处
《地理科学》
CSSCI
CSCD
北大核心
1991年第2期165-171,共7页
Scientia Geographica Sinica
关键词
地貌
大拐弯峡谷
水汽通道
褶断山
Gteat Bend Gorge
Moisture passageway
Fold-fault motintain
Antecedent river
