Сhevkinite-(Се) and perrierite-(Се) in the island arc quartz gabbro-norite-dolerites of the Ayu-Dag intrusion, Rocky Crimea

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Сhevkinite-(Се) and perrierite-(Се) are minerals characteristic for alkaline magmatic rocks and high-temperature alkaline metasomatites, and yet they are typical accessory minerals in Mesozoic island-arc gabbroids of the Rocky Crimea. Early magmatic mineral associations in these low-alkaline rocks of Ayu-Dag intrusion include accessory Ti—Zr—LREE minerals under-saturated in silica: chevkinite-(Се), perrierite-(Се), zirconolite, baddeleyite. Сhevkinite and perrierite occur as isolated shortly prismatic crystals up to 0.1 mm in size and strongly corroded inclusions in center of late-magmatic allanite-(Ce) crystals. Both minerals are the main concentrators of lanthanides in Aju-Dag gabbroids. Distribution of lanthanides in them is as following: Ce ˃> La > > Nd >> Pr > Gd, Sm, Tb, Dy. Contents of lanthanides in chevkinite and perrierite are identical: Ce (54—58 % REE) — La (25—31 %) — Nd (12—20 %). Contents of Zr, Th, Y, Sc in both polymorphs are identical also. Сhevkinite-(Ce) of isolated crystals is magnesium-dominant; its composition is: [Cе1.5La0.8—0.9Nd0.3—0.4Pr0.1(Gd+Sm+Tb+Dy)0.1Y0.2Sc0.1Ca0.7—0.8Na0.1]4(Mg0.5Fe3+0.5)1 × (Fe3+1.1—1.2Ti0.4—0.7Zr0.1—0.2Al0.1—0.2)2Ti2[(Si3.7—4Al0.3—0)4O22]. Сhevkinite-(Ce) from inclusions in allanite is poor in Mg, its formula is: [Cе1.5—1.7La0.6—0.9Nd0.5—0.6Pr0.1(Gd+Sm)0.1Y0.1—0.2Sc0.1Ca0.6—0.8Na0.1]4 × (Fe2+0.6—1Mg0—0.1Fe3+0—0.4)1(Ti0.8—0.9Fe3+0.3—0.7Al0.2—0.4Zr0—0.2)2Ti2[(Si3.9—4Al0.1—0)4O22]. Perrierite-(Ce) composing idiomorphic crystals is magnesium-dominant, its composition is: [Cе1.2—1.6La0.6—0.8Nd0.3—0.4Pr0.1 × (Gd+Sm+Tb+Dy)0.1Y0.1Sc0.1Ca1.0—1.1Sr0—0.1Na0.1]4(Mg0.9—1Fe3+0.1—0)1(Fe3+1.0—1.2Al0.2—0.7Ti0.3—0.5Zr0—0.2)2Ti2 × [(Si3.9—4Al0.1—0)4(O21.3—21.5OH0.7—0.5)22]. Perrierite-(Ce) occurring inside allanite is poor in Mg, with the formula: [Cе1.3—1.5La0.7—0.8Nd0.3—0.5Pr0.1(Gd+Sm)0.1Y0.1Sc0.1Ca1.1—1.3Na0.1]4(Fe2+0.4—0.5Fe3+0.2—0.4Mg0.2)1 × (Al0.5—0.7Ti0.3—0.8Fe3+0.3—0.9Zr0.1—0.3)2Ti2[(Si3.9—4Al0.1—0)4(O21.4—22OH0.6—0)22]. Presence of chevkinite, perrierite and zirconolite in unusual geochemical settings may be explained perhaps by poor development of late-magmatic processes in near-surface intrusions of Crimeaʼs Mesozoids.

Perhaps, the presence of chevkinite and perrierite, as well as zirconolite in unusual geochemical settings can be explained by poor development of late-magmatic processes in near-surface intrusives of the Mountain Crimea mesozoids.

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Ernst Spiridonov

Lomonosov Moscow State University

Email: ernstspiridon@gmail.com
SPIN 代码: 2534-3064

Professor, Dr. geol.-min. sciences, Professor, Department of Mineralogy, Geological Faculty

 

俄罗斯联邦, 119234, Russia, Moscow, Lenin Hills, 1

Sergey Filimonov

Lomonosov Moscow State University

Email: sefi@geol.msu.ru
SPIN 代码: 1446-7970

Candidate geol.-min. Sci., Associate Professor, Department of Mineralogy, Geological Faculty

Moscow, Lenin Hills, 1 Russia

Evgenia Semikolennyh

A.P. Karpinsky Russian Geological Research Institute

Email: geny_shen@mail.ru

Researcher

199106, St. Petersburg, Sredny ave., 74

Natalia Korotaeva

Lomonosov Moscow State University

Email: mineral@geol.msu.ru

Leading Engineer of the Laboratory for Local Research Methods at the Department of Petrology, Geological Faculty

Moscow, Lenin Hills, 1 Russia

Nadezhda Krivitskay

Lomonosov Moscow State University

编辑信件的主要联系方式.
Email: nnkriv@mail.ru
SPIN 代码: 8010-0291

Senior Researcher Candidate geol.-min. Sciences, Senior Researcher, Department of Mineralogy, Geological Faculty
grant

Moscow, Lenin Hills, 1 Russia

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