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Titolo:
Nepheline-bearing alkali feldspar syenite (pulaskite) in the Khibina pluton, Kola Peninsula, NW Russia: petrological investigation
Autore:
Korobeinikov, AN; Laajoki, K; Gehor, S;
Indirizzi:
Kola Sci Ctr, Inst Geol, Apatity 184200, Russia Kola Sci Ctr Apatity Russia 184200 tr, Inst Geol, Apatity 184200, Russia Univ Oulu, Inst Geosci, FIN-90570 Oulu, Finland Univ Oulu Oulu Finland FIN-90570 u, Inst Geosci, FIN-90570 Oulu, Finland
Titolo Testata:
JOURNAL OF ASIAN EARTH SCIENCES
fascicolo: 2, volume: 18, anno: 2000,
pagine: 205 - 212
SICI:
1367-9120(200004)18:2<205:NAFS(I>2.0.ZU;2-E
Fonte:
ISI
Lingua:
ENG
Soggetto:
SOUTH GREENLAND; COMPLEX; PETROGENESIS; NOMENCLATURE; AMPHIBOLES; MAGMATISM; PYROXENES; PROVINCE; MINERALS; QUARTZ;
Keywords:
Kola Peninsula; Khibina alkaline complex; nepheline syenite; syenite; pulaskite;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
33
Recensione:
Indirizzi per estratti:
Indirizzo: Korobeinikov, AN Kola Sci Ctr, Inst Geol, Apatity 184200, Russia Kola Sci Ctr Apatity Russia 184200 atity 184200, Russia
Citazione:
A.N. Korobeinikov et al., "Nepheline-bearing alkali feldspar syenite (pulaskite) in the Khibina pluton, Kola Peninsula, NW Russia: petrological investigation", J ASIAN E S, 18(2), 2000, pp. 205-212

Abstract

The geological position and probable origin of nepheline-bearing alkaline syenite (pulaskite) found within foyaite of the Khibina pluton, Kola Peninsula, Russia, are discussed. A large body of pulaskite (4.5 km(2)) was identified under the Quaternary deposits in the eastern part of the pluton as a result of gravimetric surveying and drilling. Genetic relations between pulaskite and the host foyaite were examined by whole-rock chemistry, including major and trace elements, the composition of the rock-forming clinopyroxenes and the diagram of phase equilibria in the system NaAlSiO4-KAlSiO4-SiO2-H2O. The results regarding mafic silicates show that pulaskite may constitute the less evolved member of a pulaskite-foyaite series, which suggests that it was formed by feldspar fractionation from an almost eutectic phonolitic melt, the parental one for both foyaite and pulaskite. The geochemical data, however, also enable us to assume the probability of additional petrogenetic mechanisms. The trace element abundance patterns may provide preliminary evidence for a, process of crustal contamination of a mantle-derived phonolite magma. This process may have contributed to the genesis of the pulaskite. (C) 2000 Elsevier Science Ltd. All rights reserved.

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Documento generato il 14/07/20 alle ore 06:42:07