电子探针分析技术在古地磁重磁化问题研究中的应用  

Remagnetization Study in Paleomagnetism by EPMA

作　　者：陈克樵[1] 徐和聆[2] 马醒华[2] 孙知明[2] 

机构地区：[1]中国地质科学院矿产资源研究所,北京100037 [2]中国地质科学院地质力学研究所,北京100081

出　　处：《岩矿测试》2002年第1期1-6,共6页Rock and Mineral Analysis

基　　金：国家自然科学基金资助 (4 9972 0 2 0 )

摘　　要：采用电子探针能谱分析、波谱定量分析和背散射 (或二次 )电子像、元素特征X射线像与元素面分析等分析技术 ,研究了导致华北盆地南缘早古生代碳酸盐岩发生重磁化的磁铁矿交代 (黄铁矿 )作用。研究结果表明 ,电子探针非常适用于深入研究古地磁重磁化问题 ,其多种分析技术不但能够提供包括假像磁铁矿、磁铁矿反应边和黄铁矿交代残余在内的一系列可靠交代证据 ,而且还能根据磁铁矿中TiO2 、Al2 O3、MgO、CoO、NiO、ZnO、MoO3含量和黄铁矿中Co、Ni、Zn、Mo、Tl、Te、Ag等指示元素的定量数据 ,获得有关它们的成因信息 。The metasomatism of replacing pyrite with magnetite led to the remagnetization in the Lower Paleozoic carbonate from southern part of the Huabei basin was studied by means of electron probe microanalysis (EPMA) technique including energy spectroscopy, wave spectroscopy, backward scatter(or secondary) electron image, characteristic X ray image and distribution analysis of elements.The preliminary results suggest that EPMA is a very suitable choice for this study, which can not only offer enough evidences to support the metasomatism e.g. pseudomorph magnetite, reaction border of magnetite and metasomatic relict of pyrite, but also obtain their genetic messages to deal with the remagnetization mechanism on the basis of the contents of TiO 2,Al 2O 3,MgO,CoO,NiO,ZnO,MoO 3 in magnetites and the quantitative data of Co, Ni, Zn, Mo, Tl, Te, Ag, As in pyrites.

关 键 词：电子探针 重磁化 磁铁矿交代黄铁矿 交代证据 成因信息 古地磁 

分 类 号：P318.4[天文地球—固体地球物理学] P575.1[天文地球—地球物理学]