宁镇地区下蜀黄土粒度特征及其古环境意义
发布时间：2018-11-27 15:15
【摘要】：黄土的粒径对于反映古季风强度变化、物源区环境变迁和黄土沉积后改造作用等具有重要的意义。中国东部宁镇地区位于东亚冬、夏季风交汇地带,在晚第四纪普遍发育下蜀黄土,它是研究东亚气候及季风演化的良好载体。对南京周家山、镇江W 山典型下蜀黄土剖面进行了系统的粒度特征分析,结果表明下蜀黄土风尘沉积是由"近源"粗颗粒物质和"远源"细颗粒物质共同作用的产物。周家山剖面粒度组分含量变化记录指示了下蜀黄土所经历的古气候环境较之西北黄土更为暖湿,经历了较之更强的后期风化成壤作用,大致上经历了2次完整的干冷-暖湿气候旋回。
[Abstract]:The size of loess is of great significance to reflect the change of paleo monsoon intensity, the environmental change of provenance and the transformation of loess after sedimentation. The Ningzhen area in eastern China is located at the intersection of East Asian winter and summer monsoon. Xiashu loess was widely developed in the late Quaternary. It is a good carrier for studying the evolution of East Asian climate and monsoon. The grain size characteristics of typical Xiashu loess profiles in Zhoujiashan, Zhenjiang and Zhenjiang are analyzed systematically. The results show that the aeolian dust deposition of Xiashu loess is the result of the interaction of "near source" coarse granular material and "distant" fine granular material. The change of grain size component content in Zhoujiashan section indicates that Xiashu loess experienced more warm and wet paleoclimate environment than northwest loess, and experienced stronger weathering and soil formation in late stage. It has experienced two complete dry-cold-warm-wet climate cycles.
【作者单位】： 华东师范大学地理科学学院地理信息科学教育部重点实验室;
【基金】：国家自然科学基金项目(J1310028;41371032)
【分类号】：S151.9
本文编号：2361251
[Abstract]:The size of loess is of great significance to reflect the change of paleo monsoon intensity, the environmental change of provenance and the transformation of loess after sedimentation. The Ningzhen area in eastern China is located at the intersection of East Asian winter and summer monsoon. Xiashu loess was widely developed in the late Quaternary. It is a good carrier for studying the evolution of East Asian climate and monsoon. The grain size characteristics of typical Xiashu loess profiles in Zhoujiashan, Zhenjiang and Zhenjiang are analyzed systematically. The results show that the aeolian dust deposition of Xiashu loess is the result of the interaction of "near source" coarse granular material and "distant" fine granular material. The change of grain size component content in Zhoujiashan section indicates that Xiashu loess experienced more warm and wet paleoclimate environment than northwest loess, and experienced stronger weathering and soil formation in late stage. It has experienced two complete dry-cold-warm-wet climate cycles.
【作者单位】： 华东师范大学地理科学学院地理信息科学教育部重点实验室;
【基金】：国家自然科学基金项目(J1310028;41371032)
【分类号】：S151.9
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