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| 沉积物粒度分析在阿尔金山隆升研究中的应用 | |
| 引用本文： | 王亚东,刘永江,常丽华,ANDREA B.Rieser,计桂霞.沉积物粒度分析在阿尔金山隆升研究中的应用[J].吉林大学学报(地球科学版),2005,35(2):155-162. |
| 作者姓名： | 王亚东 刘永江 常丽华 ANDREA B.Rieser 计桂霞 |
| 作者单位： | 1. 吉林大学,地球科学学院,吉林,长春,130061;兰州大学,资源环境学院,甘肃,兰州,730000 2. 吉林大学,地球科学学院,吉林,长春,130061 3. 奥地利萨尔茨堡大学 地质古生物系,奥地利,萨尔茨堡,A-5020 |
| 基金项目： | 国家自然科学基金 , 高等学校博士学科点专项科研项目 , 吉林大学校科研和教改项目 , 吉林大学校科研和教改项目 |
| 摘 要： | 山体隆升必然制约两侧盆地的沉积,这种约束体现在盆地的沉积响应上.柴达木盆地西北缘的阿尔金山,位于青藏高原的西北边界,自第三纪以来发生了多次隆升事件,其中以早更新世末的一次最为强烈.本次研究在阿尔金山山前红三旱一号剖面干柴沟组自下而上不同层位选取典型的沉积岩样品,进行了系统的薄片矿物鉴定和粒度分析,发现沉积区柴达木盆地的沉积环境和气候条件因受阿尔金山多期次隆升的影响而发生变化,其各方面的沉积特点受到物源区的控制.研究表明,始新世时(下干柴沟组)物源区阿尔金山相对于柴达木盆地没有发生明显的快速隆升,到渐新世(上干柴沟组)阿尔金山相对于柴达木盆地开始发生强烈的快速隆升,沉积区气候变得明显干旱.中新世到上新世(下、上油砂山和狮子沟组)红三旱地区整体处于抬升阶段,可能阿尔金山相对于沉积盆地区不具有明显的地形高差,到早更新世(七个泉组)阿尔金山开始发生急剧隆升,相对于柴达木盆地沉积区在地形上出现巨大的相对高差,这一隆升事件目前仍在持续.该研究也为青藏高原的多次隆升和气候环境变化提供了佐证. |
| 关 键 词： | 粒度分析 阿尔金山 柴达木盆地 沉积物 沉积物 粒度分析 阿尔金山 快速隆升 研究 应用 Uplift Analyse Grainsize Sediment 气候环境变化 相对高差 地形高差 盆地区 抬升 狮子沟组 砂山 上新世 中新世 干旱 |
| 文章编号： | 1671-5888(2005)02-0155-08 |
| 修稿时间： | 2004年5月17日 |
Application of Sediment Grainsize Analyse Researched on the Uplift of Altyn |
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| WANG Ya-dong,LIU Yong-jiang,CHANG Li-hua,ANDREA B.Rieser,JI Gui-xia.Application of Sediment Grainsize Analyse Researched on the Uplift of Altyn[J].Journal of Jilin Unviersity:Earth Science Edition,2005,35(2):155-162. | |
| Authors: | WANG Ya-dong LIU Yong-jiang CHANG Li-hua ANDREA BRieser JI Gui-xia |
| Abstract: | Mountain uplifting must have controlled the sedimentation of the basins on both sides of the mountains uplifted and such a constraint is represented by sedimentary responses of the basins. The Altyn Mountains along the northwestern margin of the Qaidam basin act as the north-west boundary of the Qaidam basin and Qinghai-Tibet Plateau. It has experienced several uplifting events in the Cenozoic, in which the last-phase and strongest uplifting occurred in early Late-Pleistocene. The studied samples of sandstone were collected from the Hongsanhan No.1 area along a crossed profile in front of the Altyn Mountains. The detailed microscope works and grain size analyses of the samples have been done, and from which the authors may conclude that the Altyn Mountains uplifting events then had controlled the sedimentary environment of the basin and related climatic conditions. Sedimentary characters are often constrained by source area. The present study indicates that Altyn Mountains were not experiencing a rapid uplifting (Xiaganchaigou Formation) topographically relative to the Qaidam basin at Eocene, but it began to rapid intensive uplifting at Oligocene (Shangganchaigou Formation) and the climate then became drought. The Hongsanhan area was in a regional uplifting tectonic setting and did not have a distinct topographical difference between the Altyn Mountains and Qaidam basin from Oligocene to Plicocene (Xiayoushashan Formation,Shangyoushashan Formation and Shizigou Formation). The Altyn Mountains started the final intensively rapid uplifting in Early Pleistocene (the Qigequan Formation) and then a relatively big elevation difference appeared between the Altyn Mountains and the Qaidam basin. The uplifting continues up to now. The present study provides more evidences for the research of multiple uplifting and of climate changes in the entire Qinghai-Tibet Plateau. |
| Keywords: | grain-size analysis the Altyn Mountains the Qaidam basin sediment |
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