INVESTIGATION INTO THE SOURCE OF MAGNETIC MINERALS IN SOME FINNISH LAKE-SEDIMENTS

被引：61

作者：

STOBER, JC

THOMPSON, R

机构：

[1] Department of Geophysics, University of Edinburgh, Edinburgh, Scotland

来源：

EARTH AND PLANETARY SCIENCE LETTERS | 1979年 / 45卷 / 02期

关键词：

D O I：

10.1016/0012-821X(79)90145-6

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 source of magnetic minerals in the sediments of five Finnish lakes, which carry a palaeomagnetic record of the geomagnetic field, was found to be primary magnetite in the glacial drift of the catchments. The magnetite is concentrated in the central lake sediments. The ratio of haematite to magnetite was found to decrease in the progression drift-stream bedload-lake sediment. A consistent, temporal decrease of magnetic mineral concentration was found in all the lake sediments studied and is related to maturation of the soils and vegetation surrounding the lakes. This distinctive trend contrasts with that seen in Britain and is discussed in terms of man's influence on landscape development. © 1979.

引用

页码：464 / 474

页数：11