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

被引：0
|
作者：
S. V. Ikorsky
A. A. Avedisyan
机构：
[1] Russian Academy of Sciences,Geological Institute, Kola Scientific Center
来源：
Geochemistry International | 2007年 / 45卷
关键词：
Geochemistry International; Mantle Plume; Kola Peninsula; Lower Mantle; Alkaline Rock;
D O I：
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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 3He/4He ratios (up to 3.3 × 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：7
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