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中国沙漠 ›› 2007, Vol. 27 ›› Issue (5): 771-774.

• 古气候与古环境 • 上一篇    下一篇

岭南东江流域MIS2阶段红色沙质沉积物粒度分布特征分析

杜恕环1, 李保生1,2*, 温小浩1, 李后信3, 牛东风1,4, 欧先交1, 邱世藩1

  

  1. 1.华南师范大学地理科学学院, 广东 广州 510631; 2.中国科学院地球环境研究所黄土与第四纪地质国家重点实验室, 陕西 西安 710061; 3.中国科学院广州地球化学研究所, 广东 广州 510640; 4.包头职业技术学院, 内蒙古 包头 010022
  • 收稿日期:2006-10-17 修回日期:2007-01-22 出版日期:2007-09-20 发布日期:2007-09-20

Grain\|size Distribution Characteristics of Red Sandy Sediments in Dongjiang River Valley, Southern Nanling Mountains during MIS2 Phase

DU Shu\|huan1, LI Bao\|sheng1,2, WEN Xiao\|hao1, LI Hou\|xin3,
NIU Dong\|feng1,4, OU Xian\|jiao1, QIU Shi\|fan1
  

  1. 1.Department of Geography, South China Normal University, Guangzhou 510631, China; 2.State Key Laboratory of Loess and Quaternary Geology, Institute of Earth Environment, Chinese Academy of Sciences, Xi'an 710061, China; 3.Institute of Guangzhou Geochemistry, Chinese Academy of Sciences, Guangzhou 510640, China; 4.Baotou Vocational College, Baotou 010022, Inner Mongolia, China
  • Received:2006-10-17 Revised:2007-01-22 Online:2007-09-20 Published:2007-09-20

摘要: 南岭以南东江流域临江地层剖面LJ3层位是一套红色沙质沉积物,经TL年代测定其形成于(9 500±800)—(19 600±1 800) a BP的MIS2阶段。根据对该层16个样品(LJ3\|100到LJ3-85)的粒度分析结果,发现:①各个粒组配置给不同样品具有大致相同的含量;②)Md、Mz、σ、Sk和Kg从LJ3\|100到LJ3\|85摆动在一个狭窄的区间;③诸样品在概率累积曲线上的各个段落以基本相同的斜率平行延展。经研究,这三个方面都共同的反映了LJ3的风成特征。据此认为,该层是发生在岭南MIS2阶段内的红色沙质沉积物,反映了当时干旱的气候。

关键词: 南岭以南, 东江流域, 红色沙质沉积物, 粒度分析, 干旱环境

Abstract: Layer LJ3 of Linjiang stratigraphic section in Dongjiang river valley in the south of Nanling Mountains is a set of red sandy sediments. Measured by TL dating it was found to be formed in MIS2 phase of (9 500±800)—(19 600±1 800)a BP. Analyzed by the grain sizes of the 16 samples (LJ3-100 to LJ3-85) in this layer, it was discovered that: ①The contents of each grain group in different samples are similar;② The values of Md, Mz, σ ,Sk and Kg swing from LJ3-100 to LJ3\|85 in a narrow range;③The segments of each samples in the accumulative curves extend parallel with similar slopes. All the three aspects reveal the aeolian characteristics of layer LJ3. Hereby, the layer LJ3 is made up of red sandy sediments formed in MIS2 in the south of Nanling Mountain, reflecting the arid climate at that time.

Key words: the south of Nanling Mountains, Dongjiang river valley, red sandy sediment, grain-size analysis, arid environment

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