The Kostomuksha greenstone belt, NW Baltic shield: Remnant of a late Archaean oceanic plateau?

被引：21
|
作者：
Puchtel, IS
Hofmann, AW
Jochum, KP
Mezger, K
Shchipansky, AA
Samsonov, AV
机构：
[1] RUSSIAN ACAD SCI,GIN,MOSCOW 109017,RUSSIA
[2] RUSSIAN ACAD SCI,IGEM,MOSCOW 109017,RUSSIA
来源：
TERRA NOVA | 1997年 / 9卷 / 02期
关键词：
D O I：
10.1111/j.1365-3121.1997.tb00009.x
中图分类号：
P [天文学、地球科学];
学科分类号：
07 ;
摘要：
The Kostomuksha greenstone belt consists of two lithotectonic terranes, one mafic igneous and the other sedimentary, separated by a major shear zone, The former contains submarine 2.8 Gyr old komatiite-basalt lavas and volcaniclastic lithologies with trace element and isotopic compositions resembling those of recent oceanic flood basalts [epsilon Nd(T) = + 2.8, mu(1) = 8.73 (Nb/Th)N = 1.5-2.1 (Nb/La)N = 1.0-1.5], We suggest that the mafic terrane is a remnant of the upper crustal part of an Archaean oceanic plateau derived from partial melting of a mantle plume head.
引用
收藏
页码：87 / 90
页数：4
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