地理科学 ›› 1996, Vol. 16 ›› Issue (2): 159-163.doi: 10.13249/j.cnki.sgs.1996.02.159

• 研究报道 • 上一篇    下一篇

黄土高原全新世黄土重矿物研究及其土壤发生学意义

贺秀斌1, 唐克丽1, 雷祥义2   

  1. 1. 中国科学院、水利部西北水土保持研究所国家重点实验室, 陕西 扬陵712100;
    2. 西北大学地质系, 西安710068
  • 收稿日期:1994-10-01 修回日期:1995-01-01 出版日期:1996-03-20 发布日期:1996-03-20

ANALYSIS OF HEAVY MINERALS OF HOLOCENE LOESS ON LOESS PLATEAU AND ITS ASPECTS OF PEDOGENESIS

He Xiubin1, Tang Keli1, Lei Xiangyi2   

  1. 1. Northwest Institute of Soil and Water Conservation, Academia Sinica, Ministry of Water Resourses, Yangling 712100;
    2. Department of Geology, Northwest University, Xi’an 710068
  • Received:1994-10-01 Revised:1995-01-01 Online:1996-03-20 Published:1996-03-20

摘要: 对黄土高原三个典型全新世黄土-古土壤剖面进行密集采样,对样品中的重矿物进行了半定量统计.利用不稳定矿物与稳定矿物比值的F值指标作为矿物风化指数,说明重矿物含量变化与气候环境变迁、成土作用强度时空变化的关系.分析结果表明,F值是反映矿物风化程度较敏感的指标,也是反映生物气候环境变化、成土作用强度的敏感指标;F值表明全新世中期是成土的最佳期.黑垆土的形成过程可分为4个时期:古土壤母质黄土沉积期(12000~8500a B.P.);古土壤发育与剖面加厚期(8500~3500a B.P.);盖层形成期(3500~2500a B.P.)和盖层加厚与人为影响盖层熟化期(2500a B.P.~现今).因此,黑垆土剖面是多次环境演变和风沙沉积形成的多元发生剖面.

Abstract: On the Loess Plateau,three typical Holocene loess sections are investigated and sampled.Compositions of heavy minerals in all samples are distinguished under microscopy and their contents are semi-quantitively analysised.The content ratios of unstable minerals to stable minerals are considered as the index to reflex the degree of weathering and pedogenesis.The results indicate that:1) The categories of heavy minerals in all samples are complex and diverse,and the dominant heay minerals (opaque minerals,epidoteand hornnlende) are almost the same.However,some differences in contents are noted,especially in contents of unstable minerals.2) The F value is susceptible index of degree of weathering and pedogenesis.3) From the view piont of pedogenics,the Hei Lu Tu soil has given rise to different natural weathering conditions and human actions,the profile of Hei Lu Tu is a multi-profile.