Rare earth and isotopic (Nd, O) heterogeneity of the Archaean mantle, Baltic Shield

被引：8
|
作者：
Vrevsky, A [1 ]
Krimsky, R [1 ]
Svetov, S [1 ]
机构：
[1] INST PRECAMBRIAN GEOL & GEOCHRONOL,ST PETERSBURG 199034,RUSSIA
来源：
PRECAMBRIAN CRUSTAL EVOLUTION IN THE NORTH ATLANTIC REGION | 1996年 / 112期
关键词：
D O I：
10.1144/GSL.SP.1996.112.01.03
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：
Investigations of major and trace element geochemistry, whole-rock Sm-Nd and O isotopic composition of Archaean komatiites from the Baltic Shield show clear evidence of mantle source heterogeneity. The komatiites were generated by 50-60% partial melting of the mantle at P c. 35 kb, without garnet in the residue. Three different geochemical types of mantle source can be defined on the basis of HREE concentration: Type I, II and III sources yield komatiites with HREE abundances between 0.5-2, 2-3 and 3.5-5 Chondritic levels respectively. These types of mantle source can be correlated with three U-Pb zircon age groups of greenstone belts and their Nd and O isotopic composition.
引用
收藏
页码：43 / 53
页数：11
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