塔里木盆地腹地新生界平行剖面的磁性地层研究:对塔克拉玛干沙漠形成演化的指示意义

王鑫; 孙东怀; 王飞; 吴晟; 李宝锋

塔里木盆地腹地新生界平行剖面的磁性地层研究:对塔克拉玛干沙漠形成演化的指示意义

兰州大学西部环境教育部重点实验室, 甘肃兰州 73000

基金项目:

国家杰出青年基金 40625009

国家重点基础研究发展计划 973课题编号:2010CB833401

国家创新群体计划项目 40121061

详细信息

作者简介:
王鑫(1983-), 男, 博士生, 第四纪地质学专业, E-mial:wang_xin06@lzu.cn

中图分类号: P534.6
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- 文章访问数: 189
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- PDF下载量: 9
- 被引次数: 0
出版历程
- 收稿日期: 2010-04-20
- 刊出日期: 2010-12-01

PALAEOMAGNETIC STUDY OF THE LATE CENOZOIC STRATA IN THE CENTRAL TARIM BASIN:IMPLICATION ON THE EVOLUTION OF TAKELIMAKAN DESERT

Key Laboratory of West China's Environmental System within Ministry of Education, Lanzhou University, Gansu Lanzhou 73000, China

摘要

摘要: 选择了塔里木盆地腹地的红白山剖面, 对出露连续的晚新生代地层进行了高分辨率的磁性地层研究和古环境分析。结果表明:4.2Ma~3.4Ma, 塔里木盆地腹地的自然环境为干旱沉积平原, 气候条件相对湿热; 3.4Ma, 首次出现流动沙丘, 塔克拉玛干沙漠开始形成; 2.8Ma开始, 干旱化程度显著加强, 最终形成当今极度干旱的大型沙漠环境。在塔里木盆地的干旱化过程中, 副特提斯海的消亡、青藏高原的隆升和北极冰盖的演化均起到关键作用。
- 塔里木盆地 /
- 塔克拉玛干沙漠 /
- 磁性地层
Abstract: High resolution magnetostratigraphy study and paleoenvironment analysis were developed to the parallel section in the central of Tarim basin. The results indicate that dry land environment with relative warm and humid climate pattern dominant in the area between 4.2~3.4Ma. The oldest in-situ eolian dun sands formed in 3.4Ma, which in turn indicate the age of Taklimakan desert. The dry climate significant intensified by 2.8Ma, consequently forming the extremely dry environment like those of present. We argue that the retreat of Para-Tethys, uplift of Tibet Plateau and evolution of Northern Hemisphere glaciations are all played key roles in the desertification of interior Asian.
- Tarim Basin /
- Taklimakan Desert /
- Magnetostratigraphy

HTML全文

图 1 塔里木盆地数字高程模型图(A)及红白山剖面地质图(B)

实心圆指示剖面位置:1、红白山剖面; 2、塔格山剖面; 3、KT2钻孔; 4、KT1钻孔

Figure 1. A map showing the digital elevation model of Tarim Basin (A) and geology of the Hongbaishan section (B)

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图 2 红白山剖面地层柱状图与典型岩性照片(柱状图图例参照图 1)

Figure 2. Column of the Hongbaishan Section and photos of typical lithology

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图 3 红白山剖面磁性地层结果及与塔格山剖面^[17]、KT1^[23]、KT2^[24]钻孔、玛扎塔格剖面^[16]磁性地层的对比。柱状图图例参照图 1。

Figure 3. Palcomagnctic results of the Hongbeishan Section and correlation with Mazatagh scclion[16, 17]. KT1 Core^[23] and KT2 Core^[24]

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图 4 红白山剖面色度、磁化率指标及其反映的古环境演化序列(柱状图图例参照图 1)

Figure 4. Color index and magnetic susceptibility of Hongbaishan Section and inferred paleoenvironment evolution

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