Quaternary Lacustr ine Outwash: Sign ificance to the Western Qa idam, China

ZHONG Jian-hua; LI Hao; HUANG Li-gong; WEN Zhi-feng; GUO Ze-qing; WANG Hai-qiao; LI Yong

The Quaternary outwash, characterized by the drip stone bounded by the gray and yellow shale and mud-stone, is discovered in theMang'ai depression of Qaidam basin. The drip stone is up to 4 cm ×12 cm with complicated compositions owing to the volcanic, metamorphic and sedimentary origin. The sporo-pollen analysis revealed that it is formed in Quaternary period, most probably Pleistocene epoch, coinciding with the Quaternary glacial epoch of West China although the detailed age is, as yet, uncertain. The strong evidence of outwash existed in theMang'ai dep ression is of great importance to the research on the evolution and paleoclimate, paleogeography of Qingzang plateau of Quaternary glacial epoch of China. Moreover, it reveals that a whole ice cover in the Quaternary does not cover the Qingzang plateau

1. Institute of Earth Information and Resources, University of Petroleum (Eastern China), Dongying, Shandong 257061;

2. Guangzhou Institute of Geochemistry, Chinese Academy of Science, Guangzhou 510640

Received Date: 2004-05-26

Rev Recd Date: 2004-11-02

Publish Date: 2005-06-10

Key words:

drop stone /
outwash /
Quaternary /
Qaidam

Abstract: The Quaternary outwash, characterized by the drip stone bounded by the gray and yellow shale and mud-stone, is discovered in theMang'ai depression of Qaidam basin. The drip stone is up to 4 cm ×12 cm with complicated compositions owing to the volcanic, metamorphic and sedimentary origin. The sporo-pollen analysis revealed that it is formed in Quaternary period, most probably Pleistocene epoch, coinciding with the Quaternary glacial epoch of West China although the detailed age is, as yet, uncertain. The strong evidence of outwash existed in theMang'ai dep ression is of great importance to the research on the evolution and paleoclimate, paleogeography of Qingzang plateau of Quaternary glacial epoch of China. Moreover, it reveals that a whole ice cover in the Quaternary does not cover the Qingzang plateau

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Quaternary Lacustr ine Outwash: Sign ificance to the Western Qa idam, China

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