摘要
矿物成熟度能够很好地反映碎屑沉积物的组成状态,与物源、化学风化、搬运沉积以及气候等因素有关,因而在沙漠研究中成为重要的常量元素地球化学指标.采集古尔班通古特沙漠22个沙丘顶部沙样并对其常量元素进行测量,在此基础上利用Pettijohn提出的方法对沉积物矿物成熟度进行计算,系统分析沙漠沉积物的矿物成熟度特征.研究发现:古尔班通古特沙漠沙质沉积物存在明显的区域分布差异,呈现出从沙漠边缘向沙漠腹地递增的空间分布趋势.物源、搬运沉积和分选过程、植被以及化学风化等因素是导致其产生区域分布差异的原因.
Abstract
Mineralogical maturity can well reflect the composition of clastic sediments,which is related to prove-nance,chemical weathering,transported sediments and climate.Therefore,it has become an essential geochemical index of major elements in desert research.In this study,sand samples were collected from 22 dune tops in the Gurbantunggut Desert and their major elements were measured.On this basis,the mineralogical maturity of the sediment was calculated using the method proposed by Pettijohn,and the mineralogical maturity characteristics of the desert sediment were systematically analyzed.It was found that the sandy sediments in the Gurbantunggut Desert had obvious zonal and distributional differences,showing an increasing spatial distribution trend from the desert edge to the desert hinterland.Factors such as physical sources,transport deposition and sorting processes,vegetation,and chemical weathering are responsible for the regional distribution differences.
国家科技期刊平台
NSTL
维普
万方数据