甘孜黄士研究的新进展
文献类型：会议论文
| 作者 | 方小敏 ; 陈富斌 ; 施雅凤 ; 李吉均 |
| 出版日期 | 1996-05 |
| 会议名称 | 全国第一届应用第四纪学术会议 |
| 会议日期 | 1995-4 |
| 会议地点 | 成都 |
| 关键词 | 甘孜黄土 形成年代 成因 环境意义 |
| 页码 | 40-45 |
| 其他题名 | Recent Studies for the Loess of Ganzi |
| 通讯作者 | 方小敏 |
| 中文摘要 | 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。 |
| 英文摘要 | Magnetic 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. |
| 合作状况 | 国内 |
| 会议主办者 | 中国科学院水利部成都山地灾害与环境研究所 |
| 会议录 | 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
 |
| 会议录出版者 | 成都科技大学出版社 |
| 会议录出版地 | 成都 |
| 语种 | 中文 |
| ISBN号 | 7-5616-3241 |
| 源URL | [http://ir.imde.ac.cn/handle/131551/7864]  |
| 专题 | 成都山地灾害与环境研究所_成都山地所知识仓储（2009年以前） |
| 推荐引用方式 GB/T 7714 | 方小敏,陈富斌,施雅凤,等. 甘孜黄士研究的新进展[C]. 见:全国第一届应用第四纪学术会议. 成都. 1995-4. |
入库方式： OAI收割
来源：成都山地灾害与环境研究所
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