Chlorine stable isotopes in carbonatites: Evidence for isotopic heterogeneity in the mantle

被引:20
|
作者
Eggenkamp, HGM [1 ]
vanGroos, AFK [1 ]
机构
[1] UNIV ILLINOIS,DEPT GEOL SCI,CHICAGO,IL 60607
关键词
carbonatites; Cl-37/Cl-35; isotopes; mantle;
D O I
10.1016/S0009-2541(97)00021-1
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
Eight carbonatite samples were analysed for delta(17)Cl and for delta(18)O and delta(13)C. Th, results show that unaltered carbonatites have delta(37)Cl ratios between -0.8 and +0.1 parts per thousand. Because the whole mantle delta(37)Cl value is approximately +4.7 parts per thousand, chlorine for carbonatite is anomalously light. Although it is possible that the source regions for carbonatites represent isotopic anomalous mantle and may reflect contamination by a crustal component, our preferred explanation is that the processes resulting in the accumulation of carbonatite magma cause fractionation of chlorine isotopes.
引用
收藏
页码:137 / 143
页数:7
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