Petrology and geochemistry of a U and Th enriched nephelinite from Mt. Nyiragongo, Zaire: Its bearing on ancient mantle metasomatism
Unusual large Pb isotope variations found by Vollmer and Norry (1983 a) in nephelinites from Nyiragongo and related volcanoes date a 500 Myr old U(Th)/Pb fractionation. U‒Th‒Pb systematics suggest that U,Th and radiogenic Pb are concentrated in an accessory xenocryst phase. We undertook a detailed m...
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| Format: | Article |
| Language: | English |
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Geological Society of Finland
1985-12-01
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| Series: | Bulletin of the Geological Society of Finland |
| Subjects: | |
| Online Access: | http://www.geologinenseura.fi/bulletin/Volume57/sgs_bt_057_pages_037_046.pdf |