IMHE OpenIR  > 成都山地所知识仓储(2009年以前)
Alternative TitleRecent Studies for the Loess of Ganzi
方小敏; 陈富斌; 施雅凤; 李吉均
Corresponding Author方小敏
Source Publication全国第一届应用第四纪学术会议 ; 中国应用第四纪研究——全国第一届应用第四纪学术会议论文集
Conference Date1995-4
Conference Place成都
Publication Place成都
Funding Organization中国科学院水利部成都山地灾害与环境研究所
Abstract逐样系统统退磁磁性测量表明, 86m 的甘孜黄土剖面形成距今约76.6 万年。系统统4 英砂分析揭示黄土中冰川冰缘砂含量平均高达40.03% ,最高发生于距今约73 万年处,达65% ,其次于约17~20 万年处,达56.52% ,倒数第二次冰期后明显减少,而风沙颗粒
的含量在黄土中一般高于古土嚷,且在约60 万年前发生显著改变,其后含量普遍两倍于早先的含量,并于倒数第二;水期后边步增加,反映自约76.6 万年以来,高原冰川一直存在,而且可能在约73 万年前规模最大. ,即倒数第三次冰期,倒二冰期时冰川规模次之,其后,冰川规模明显减少,同时也反映大气环流和环境在这些时期以及约60 万年前有过较明显的改变或调整与增强,是青藏高原隆起阶段性环境突变效应的产物。黄土主要为风成,物质主要来源于青藏高原本身。
Other AbstractMagnetic polarity dating of 86 m loess section at Ganzi (Garze) on the southeastern Q inghai-Xizang (T ibet) Plateau dem onstrates that the bottom of the section was formed 766 ka BP. A nalysis of quartz sand types in the section reveals that the content of glacial and periglacial sands reaches and average of 10. 03 %, with a maximum of 65 % round 710ka (high peak extending to c. 500ka) and a second maximum of 56. 52% between 170-200ka. and has a big decrease after penultimate glaciaI. Aeolian sands have a higher content in loess than that in its interbedded plaeosols , have a sharp shift in content at about 600 ka that their content after that time mainly doubles that before , and increase gradual1y after penultimate glacial. These indicate that the Qinghai-Xizang Plateau uplifted above snow line and began to develop glaciers at least 766 ka ago. Soon late (c. 710ka) , glaciers reached their maximum , which are also largest in scale during 766 ka , and may persist to about 500 ka. The second largest glaciers developed during the penultimate. Since the penultimate , the scale of glaciers decreases greatly. The results also suggest that air circulation and environment occurred sharp changes or adjustments and enhancement at about 766 ka , 600 ka and 150 ka. They may be the results of accompanied environmental abrupt changes at some critical heights of thd Qinghai-Xizang Plateau with the step uplift of the Plateau. The Ganzi loess is mainly aeolian and its materials come principally from the Plateau itself.
Keyword甘孜黄土 形成年代 成因 环境意义
Document Type会议论文
Corresponding Author方小敏
Recommended Citation
GB/T 7714
方小敏,陈富斌,施雅凤,等. 甘孜黄士研究的新进展[C]. 成都:成都科技大学出版社,1996:40-45.
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