IMHE OpenIR  > 成都山地所知识仓储(2009年以前)
甘孜黄士研究的新进展
Alternative TitleRecent Studies for the Loess of Ganzi
Language中文
方小敏; 陈富斌; 施雅凤; 李吉均
Corresponding Author方小敏
1996-05
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
Pages40-45
Conference Date1995-4
Conference Place成都
Publication Place成都
Publisher成都科技大学出版社
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
ISBN7-5616-3241
Document Type会议论文
Identifierhttp://ir.imde.ac.cn/handle/131551/7864
Collection成都山地所知识仓储(2009年以前)
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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