###
DOI:
地质力学学报:2009,15(1):95-104
←前一篇   |   后一篇→
本文二维码信息
码上扫一扫!
江西九江红土堆积的粒度特征及成因研究
(1.中国地质科学院地质力学研究所;2.中国地质科学院地质力学研究所,国土资源部新构造运动与地质灾害重点实验室;3.中国地质科学院地质力学研究所,中国海洋大学海洋地球科学学院)
Aeolian origin of the red earth tormation in Jiujiang City of Jiangxi Province, China: Evidence from grain-size analysis
(1.Institute of Geomechanics, Chinese Academy of Geological Sciences;2.Key Laboratory of Neotectonic Movement & Geohazard;3.College of Marine Geo-science, Ocean University of China)
摘要
图/表
参考文献
相似文献
本文已被:浏览 3506次   下载 2252
    
中文摘要: 在南方红土的研究中,区分不同地区红土地层的成因类型是研究区域古环境演化的 关键。以江西九江红土剖面为例,通过系统的粒度分析,并与西峰黄土、古土壤样品及代表 性河、湖相沉积的粒度特征进行对比,结果表明,九江红土与西峰黄土、古土壤样品具有 相似的粒度分布特征,而与河、湖相沉积有较大区别。其中,九江剖面上部的下蜀土与西峰 黄土粒度特征相近,而剖面下部的网纹红土与西峰古土壤样品更为相似,表明江西九江红土 堆积与中国北方黄土一样属于风尘堆积。研究成果为古环境信息的进一步提取奠定了基础。
中文关键词: 江西九江  网纹红土  下蜀土  粒度特征  成因
Abstract:The Red Earth Formation in the middle lower Yangtze River is an import ant pedo stratigraphical unit in southern China. This formation is among the b e st geological records of Quaternary environment that bear information of climate changes for the subtropical zone of China. The study on the origin of this form ation is the basis for further investigation of the paleoclimatic information. I n this study, grain size was analyzed on the samples from Jiujiang section at J i ujiang city of Jiangxi Province, and the result was compared with that of the ty pical Quaternary eolian deposit, as well as the lacustrine and fluvial sediments . Grain size distribution was determined with a Malvern Mastersizer 2000 partic l e analyzer with a precision less than 1%. The analysis on grain size indicates t hat the Xiashu loess and vermiculated red soil (VRS) in Jiujiang section consist of uniform fine particles. The particles display a bimodal distribution, with g rain size fraction of 5~50 μm dominantly, and > 63μm in a small part. The di stribution is essentially similar to that in the Xifeng loess samples, but diffe r from the multimodal patterns of the lacustrine and fluvial deposits. The Xiash u loess and VRS are also similar to the Xifeng loess samples in grain size para meter. The mean grain sizes of the Xiashu loess and VRS are about 64~68 (90~118 μm) and 71~72(68~73 μm) respectively, somewha t finer tha n thos e of the Xifeng loess samples. The Xiashu loess, VRS and Xifeng loess have a sma ller mean square deviation value than the fluvial samples, indicating a much bet ter sorting and relatively stable depositional dynamics. The Xiashu loess, VRS a nd Xifeng loess samples show a positive skewness, but the fluvial samples a nega tive one. The lacustrine samples also show a positive, but obviously larger skew nes s. In kurtosis value, the Xiashu loess and VRS samples are close to the Xifeng l oess, and the fluvial sediments are obviously smaller than the lacustrine sample s. All these indicate that the Red Earth Formation in Jiujiang area have the sam e origin as the Quaternary loess in northern China.
文章编号:     中图分类号:    文献标志码:
基金项目:
引用文本:
李敬卫,乔彦松,王燕,等,2009.江西九江红土堆积的粒度特征及成因研究[J].地质力学学报,15(1):95-104.DOI:
LI Jing-wei,QIAO Yan-song,WANG Yan,et al,2009.Aeolian origin of the red earth tormation in Jiujiang City of Jiangxi Province, China: Evidence from grain-size analysis[J].Journal of Geomechanics,15(1):95-104.DOI:

用微信扫一扫

用微信扫一扫