The anisotropy of loess magnetic susceptibility in the northeastern fringe of Qinghai-Xizang Plateau as an indicator of palaeowind direction
The anisotropy of loess magnetic susceptibility in the northeastern fringe of Qinghai-Xizang Plateau as an indicator of palaeowind direction
复制标题
DOI：
10.1007/s11769-997-0086-x
复制
发表时间：
1998-03
影响因子：
3.4
通讯作者：
Jianli Wang
中科院分区：
文献类型：
--
作者：
Jianli Wang
首次利用黄土磁化率（AMS）测量的各向异性对中国西北地区的古地下风向进行了系统的估计。在兰州、临夏、武都地区采集了140个原状定向风成黄土样品进行AMS测量，结果表明黄土沉积时地面风向并不相同。从早更新世到中更新世直至晚更新世，研究区的风向经历了逆时针旋转。我们认为这种变化与青藏高原的隆升以及海流和地貌效应的调整有关。
Estimates of the palaeo-subaerial wind direction were studied systematically for the first time by using the anisotropy of loess magnetic susceptibility (AMS) measurements in the northwestern China. One hundred and forty undisturbed oriented aeolian loess samples were collected from Lanzhou, Linxia and Wudu areas for AMS measurements, which indicated the subaerial wind directions were not the same while the loess deposited. From the Early Pleistocene to Middle Pleistocene till Late Pleistocene, the wind direction experienced an anticlockwise rotation in the studied area. We suggested this change was related to the uplift of the Qinghai-Xizang Plateau and the adjustment of current and landform effects.