MAGNETIC MINERALOGY OF CHINESE LOESS AND ITS SIGNIFICANCE

被引：141

作者：

LIU, XM

SHAW, J

LIU, TS

HELLER, F

YUAN, BY

机构：

[1] ACAD SINICA,INST GEOL,BEIJING 100029,PEOPLES R CHINA

[2] SWISS FED INST TECHNOL,INST GEOPHYS,CH-8093 ZURICH,SWITZERLAND

来源：

GEOPHYSICAL JOURNAL INTERNATIONAL | 1992年 / 108卷 / 01期

关键词：

CHINESE LOESS; PALEOCLIMATE; ROCK MAGNETISM;

D O I：

10.1111/j.1365-246X.1992.tb00859.x

中图分类号：

P3 [地球物理学]; P59 [地球化学];

学科分类号：

0708 ; 070902 ;

摘要：

The topmost 16 metres of the loess section at Xifeng (central Chinese loess plateau), which cover the last 128 000 years, consist of two palaeosol beds interlayered by a loess horizon. Hysteresis parameters, frequency-dependent, field- and temperature-dependent susceptibility show very similar and stable magnetic mineral constituents in both loess and palaeosol samples. The concentration and grain size of magnetite, maghaemite and haematite control the magnetic properties of Chinese loess. Susceptibility and loess thickness are closely related to geographic position and (present) climate across the loess plateau. The loess and palaeosol magnetic properties are largely controlled by the fine-grained magnetite formed in various quantities and grain sizes under the influence of pedogenesis during variable palaeoclimatic conditions. Therefore regional and global palaeoclimatic development during the last 2.5 Myr can be reconstructed from susceptibility records in the loess plateau.

引用

页码：301 / 308

页数：8

共 31 条

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