ACEBUCHES AMPHIBOLITES IN THE ARACENA HERCYNIAN METAMORPHIC BELT (SOUTHWEST SPAIN) - GEOCHEMICAL VARIATIONS AND BASALTIC AFFINITIES

被引：38
作者：
BARD, JP [1 ]
MOINE, B [1 ]
机构：
[1] CTR RECH PETROG & GEOCHIM,F-54500 VANDOEUVRE NANCY,FRANCE
来源：
LITHOS | 1979年 / 12卷 / 04期
关键词：
D O I：
10.1016/0024-4937(79)90018-5
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：
A 1500-2000 m sequence of amphibolites exhibits progressively increasing metamorphic grade from greenschist to the amphibolite/granulite facies transition. The chemical variations are considered to be principally inherited from the basaltic parent. The appearance of clinopyroxene is related to P,T and to bulk-rock composition during metamorphism. Excluding some basal rocks in the orthopyroxene zone, chemical variations related to metamorphism are minor. The small decrease in the K2O content from 0.3% to 0.1% with increasing grade suggests that the low K content was a characteristic of the basaltic precursor. These amphibolites have affinities with abyssal tholeiites. © 1979.
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页码：271 / 282
页数：12
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