Hydrocarbon gases and helium isotopes in the Paleozoic alkaline-ultramafic massifs of the Kola Peninsula

被引：2
|
作者：
Ikorsky, S. V. [1 ]
Avedisyan, A. A. [1 ]
机构：
[1] Russian Acad Sci, Kola Sci Ctr, Inst Geol, Apatity 184200, Murmansk Oblast, Russia
来源：
GEOCHEMISTRY INTERNATIONAL | 2007年 / 45卷 / 01期
关键词：
D O I：
10.1134/S0016702907010053
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：
Hydrocarbon gases ( HCG) were studied in fluid inclusions from seven alkaline - ultramafic massifs of the Kola Peninsula. All the massifs (Sebljavr, Kovdor, Lesnaya Varaka, Ozernaya Varaka, Vuorijarvi, Turii Peninsula, and Salma) are central- type cratonic intrusions with ages of 360 - 410 Ma. Previous He isotopic investigations showed that the massifs have high He-3/He-4 ratios ( up to 3.3 x 10(-5)), which are usually higher than the upper mantle value. Similar to He, HCG were extracted by crushing. The HCG were analyzed for CH4 ( main component), C2H6, and C3H8. A comparison of HCG component contents with He isotope abundances and ratios showed that the HCG were probably not supplied by mantle-derived melts. Their formation during a postmagmatic stage at relatively low temperatures is our favored model.
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页码：62 / 69
页数：8
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