Early geochemical heterogeneity (EGCH) of lead isotopic compositions and its origin

被引：0
|
作者：
欧阳自远
张福勤
王世杰
林文祝
欧阳欣凌
机构：
[1] China
[2] Institute of Geochemistry
[3] CAC
[4] Guiyang 550002
来源：
ChineseScienceBulletin | 1995年 / 21期
关键词：
lead isotope; early geochemical heterogeneity; planetesimal;
D O I：
暂无
中图分类号：
P597 [同位素地质学与地质年代学];
学科分类号：
070902 ;
摘要：
On the basis of geochemical and geophysical data, the present mantle possesses three-dimensional chemical heterogeneity. It is suggested that the evolution of geochemical heterogeneity (GCH) should be divided into three stages. The first stage is EGCH (～1.8Ga), the second stage can be regarded as the homogenizing or transform stage around 1.8Ga, and the third stage is later geochemical heterogeneity (LGCH). This note roughly summarizes EGCH of global lead isotopes composition, and suggests that the origin of EGCH stemmed from the primary/initial chemical heterogeneity (PCH) of planetesimals accumulating on the earth.
引用
收藏
页码：1808 / 1812
页数：5
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