Th-rich loparite from the Khibina alkaline complex, Kola Peninsula: isomorphism and paragenesis
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چکیده
منابع مشابه
Th-rich Ioparite from the Khibina alkaline complex, Kola Peninsula: isomorphism and paragenesis
Th-rich (up to 18.4 wt.% ThO2) loparite occurs as an accessory phase in foyaite pegmatites at Mr. Eveslogchorr, Khibina complex, Russia. It is associated with aegirine, astrophyllite, eudialyte, lorenzenite, lamprophyllite, magnesio-arfvedsonite and gerasimovskite. Loparite crystals are zoned from niobian loparite (core) to niobian thorian and thorian niobian loparite (rim). Th-enrichment is ac...
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the paper deals with the analysis of the external factor (solar activity, volcanic eruptions) influence on tree growth at the kola peninsula, northwestern russia. pinus sylvestris l. (scots pine) tree-ring chronologies collected nearby the northern timberline (68.63n, 33.25e) include the oldest (1445-2005 ad) living pine tree found up to date in the kola peninsula. a total of 18 living trees p...
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ژورنال
عنوان ژورنال: Mineralogical Magazine
سال: 1998
ISSN: 0026-461X,1471-8022
DOI: 10.1180/002646198547738