The REE, LILE and HFSE contents in minerals from silicate alkaline rocks of the Khibiny intrusions (nepheline syenites and foidolites) were first measured by a laser ablation microprobe with inductively coupled plasma mass spectrometry. The contents of Y, Li, Rb, Ba, Th, U, Ta, Nb, Sr, Hf, Zr, Pb, Be, Sc, V, Cr, Ni, Co, Cu, Zn, Ga, Mo, Sn, La, Ce, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, Lu were measured in K-feldspar, nepheline, clinopyroxene, amphibole, eudialite, lamprophyllite, apatite, titanite, and perovskite. Compositional variations in minerals originating at different stages of the massif formation indicate significant trace-element redistribution between coexisting phases during crystallization and subsequent alterations. It was shown that REE, Y, Zr, Hf, V, and Sr, which are abundant in the early magmatic minerals, primarily, clinopyroxene, are accumulated in accessory minerals (Ba lamprophyllite, eudialite, and late apatite and titanite) during late magmatic processes. Lithophile elements and Ga, which are evenly scattered over all early magmatic minerals, are partitioned in a single postmagmatic leucocratic mineral, microcline, during rock recrystallization. The co-crystallization coefficients obtained in our study for coexisting perovskite + aptite and apatite + titanite indicate predominant REE incorporation in apatite rather than in titanite, which is of decisive significance for geochemistry of economic-grade titanite-apatite-nepheline ores.

Язык оригиналаанглийский
Страницы (с-по)80-95
Число страниц16
ЖурналGeochemistry International
Том43
Номер выпуска1
СостояниеОпубликовано - 1 янв 2005
Опубликовано для внешнего пользованияДа

    Предметные области Scopus

  • Геофизика
  • Геохимия и петрология

ID: 34786188