伊犁盆地黄土分布与组成特征

doi:10.13249/j.cnki.sgs.2010.02.267

地理科学 ›› 2010, Vol. 30 ›› Issue (2): 267-272.doi: 10.13249/j.cnki.sgs.2010.02.267

伊犁盆地黄土分布与组成特征

宋友桂¹, 史正涛²

1. 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 710075;
2. 云南师范大学地理科学与旅游学院, 云南昆明 650092

收稿日期:2009-07-17 修回日期:2009-11-08 出版日期:2010-03-20 发布日期:2010-03-20
作者简介:宋友桂(1974- ),男,湖南祁阳人,博士,副研究员,主要从事地貌与环境变化研究。E-mail:syg@ieecas.cn
基金资助:
国家自然科学基金(40772116、40972230、40871018)、国家重点基础研究规划项目(2010CB833406)和中国博士后科学基金(200231234)资助。

Distribution and Compositions of Loess Sediments in Yili Basin, Central Asia

SONG You-gui¹, SHI Zheng-tao²

1. State Key Laboratory of Loess and Quaternary Geology, Institute of Earth Environment, Chinese Academy of Sciences, Xi’an, Shaanxi 710075;
2. School of Tourism and Geography, Yunnan Normal University, Kunming, Yunnan 650092

Received:2009-07-17 Revised:2009-11-08 Online:2010-03-20 Published:2010-03-20

摘要/Abstract

摘要： 在研究伊犁盆地黄土分布特征的基础上,分析了伊犁黄土的粒度、矿物和地球化学组成特征。粒度分析表明伊犁黄土以粉砂为主,含有一定量的细砂,粒径比黄土高原粗,分选性比黄土高原黄土差。在矿物组成上以石英、长石和碳酸盐类矿物为主,含一定量的绿泥石和云母。地球化学元素分析表明伊犁黄土以SiO₂、Al₂O₃、CaO为主,比黄土高原黄土富Na₂O和CaO,反映伊犁盆地黄土形成于较干冷、化学风化弱的环境。

Abstract: The loess record of Central Asia provides an important archive of regional climate and environmental change. However, in contrast to the intensively investigated loess deposits in the Chinese Loess Plateau, Central Asian loess sediments are still insufficiently known and poorly understood. Based on satellite and topography, coupling with previous literature and field investigation, the authors investigate the distribution of loess sediments in the Yili Basin, central Asia. In order to identify the physical, chemical and mineral compositions, the authors carried out grain-size, geochemical and mineralogical analyses on collected surface soil and loess samples. Grain size measurements reveal that the loess in Yili Basin is dominated by silt and have minor sand, which is coarser than that of the Chinese Loess Plateau, indicating a close source. The mineral components of loess in this region are dominated by quartz, feldspar and carbonate with minor chlorite and muscovite. Geochemistry of loess in the Yili Basin are characterized by high contents of SiO₂, Al₂O₃ and CaO, and by minor Fe₂O₃, MgO, K₂O and Na₂O. In contrast to the Chinese Loess Plateau, the loess in Yili Basin is rich Na₂O and CaO, which indicates that loess in Yili Basin originated from a relative dry-clod and weak chemical weathering environment.

中图分类号:

P931.6

宋友桂, 史正涛. 伊犁盆地黄土分布与组成特征[J]. 地理科学, 2010, 30(2): 267-272.

SONG You-gui, SHI Zheng-tao. Distribution and Compositions of Loess Sediments in Yili Basin, Central Asia[J]. SCIENTIA GEOGRAPHICA SINICA, 2010, 30(2): 267-272.

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伊犁盆地黄土分布与组成特征

Distribution and Compositions of Loess Sediments in Yili Basin, Central Asia

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