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地质科学  1976, Vol. 11 Issue (4): 291-322    DOI:
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珠穆朗玛峰北坡冈瓦纳相地层的发现
尹集祥, 郭师曾
ON THE DISCOVERY OF THE STRATIGRAPHY OF GONDWANA FACIES IN NORTHERN SLOPE OF THE QOMOLANGMA FENG IN SOUTHERN XIZANG, CHINA
Yin Jixiang, Guo Shizeng
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摘要 

于1975年我国再次登上珠穆朗玛峰的科学考察活动中,在地质方面获得了地层、古生物、岩石、构造等方面比较珍贵的资料。珠峰科考资料研究的新成果是在反击右倾翻案风斗争取得伟大胜利的大好形势推动下取得的。本刊将发表《珠穆朗玛峰北坡冈瓦纳相地层的发现》等相互联系的一组文章,从地层、沉积、古生物的角度,以较丰富的资料证实了珠峰北坡冈瓦纳相地层的存在,这对于探讨珠穆朗玛峰及喜马拉雅山的隆起和地质发展史具有重要价值。

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Abstract

Gondwana facies of Late Carboniferous and Permian age have been widely distributed in the Qomolangma Feng region in Southern Xizang, China. This paper describes the sediments in the northern slope of the Qomolangma Feng recently discovered by the Qomolangma Feng Scientific Expedition during the years 1974-1975, and also roughly correlates them with the sediments of Salt Range and other regions of the Himalayas.The Gondwana facies concerned here are characterized by the glacial marine sediments, the Stepanoviella fauna of Jilong Formation and the Glossopteris flora of the Qubu Formation. The Jilong Formation with thickness about 730 m, can be subdivided into the lower Zhadari diamictite member, the middle Stepanoviella arenaceous siltstone member and the upper Chaya Quartzose sandstone member. The Zhadari diamictite member, thick approximately 30 m, consists mainly of grey diamicti-tes of glacial marine origin and may be correlated with the Talehir boulder beds from the Indian sub-continent, the age of which is generally believed to represent Late Carboniferous or Late Carboniferous to Early Sakmarian stage. The Stepanoviella arenaceous silttone member, about 0.5-1m thick, consists of bioclastic arenaceous siltstone with aboundent megafossils known as Stepanoviella fauna of Late Sakmarian to Early Artinskian stage, comparable with the Umaria marine beds or Eurydesma fauna (s.l.) from the Indian sub-continent. The chaya quartzose sandstone member, about 700 m thick, consists of the fine sandstone and quartzose sandstone intercalated with some shales. The Qubu Formation (about 20m thick) is represented by quartzitic sandstone and shales of early Late Permian, very rich in Glossopteris flora and comparable with Raniganj Formation of the Damuda, Group in the Indian sub-continent.Following the plate tectonics theory, the "Xiang Quan-Yalu Tsangpo suture" probably represents the collision boundary of the Indian Plate subducted beneath the Eurasia Plate before 70-12 million years. Thus it obvious that the whole Himalayan mountains once occurred as a part of the northern margin of the Indian Plate, as is shown by the occurrence of the Gondwana facies in the northern slope of the Qomolangma Feng and other regions of the Himalayas. It is, therefore, suggested that the Southern Tethyan Himalayan Sea in Late Palaeozoic was an epiric sea associated with the Indian Plate.From the informations mentioned above the northern boundary of the Gondwana facies occurred in Asia continent seems to be not beyond the Xiang Quan-Yalu tsangpo river geosuture.

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. 1976, 珠穆朗玛峰北坡冈瓦纳相地层的发现. 地质科学, 11(4): 291-322.
. ON THE DISCOVERY OF THE STRATIGRAPHY OF GONDWANA FACIES IN NORTHERN SLOPE OF THE QOMOLANGMA FENG IN SOUTHERN XIZANG, CHINA[J]. Chinese Journal of Geology, 1976, 11(4): 291-322.
 
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