Zapiski RMO (Proceedings of the Russian Mineralogical Society)Zapiski RMO (Proceedings of the Russian Mineralogical Society)0869-60552658-4352The Russian Academy of Sciences1133610.30695/zrmo/2019.1484.05Research ArticleСhevkinite-(Се) and perrierite-(Се) in the island arc quartz gabbro-norite-dolerites of the Ayu-Dag intrusion, Rocky CrimeaSpiridonovErnst M.<p>Professor, Dr. geol.-min. sciences, Professor, Department of Mineralogy, Geological Faculty</p>
<p> </p>ernstspiridon@gmail.comFilimonovSergey V.<p>Candidate geol.-min. Sci., Associate Professor, Department of Mineralogy, Geological Faculty</p>sefi@geol.msu.ruSemikolennyhEvgenia S.<p>Researcher</p>geny_shen@mail.ruKorotaevaNatalia N.<p>Leading Engineer of the Laboratory for Local Research Methods at the Department of Petrology, Geological Faculty</p>mineral@geol.msu.ruKrivitskayNadezhda N.<p>Senior Researcher Candidate geol.-min. Sciences, Senior Researcher, Department of Mineralogy, Geological Faculty<br />grant</p>nnkriv@mail.ruLomonosov Moscow State UniversityA.P. Karpinsky Russian Geological Research Institute09092019148461790703201913032019Copyright © 2019, Russian academy of sciences2019<p>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 Mesozoicisland-arc gabbroids of the Rocky Crimea. Early magmatic mineral associations in these low-alkaline rocks of Ayu-Dag intrusion include accessory TiZrLREE minerals under-saturated in silica: chevkinite-(Се), perrierite-(Се), zirconolite, baddeleyite. Сhevkinite and perrieriteoccur as isolated shortly prismatic crystals up to 0.1mm 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 NdPrGd, Sm, Tb, Dy. Contents of lanthanides in chevkinite and perrierite are identical: Ce (5458% REE) La (2531%) Nd (1220%). Contents of Zr, Th, Y, Sc in both polymorphs are identical also. Сhevkinite-(Ce) of isolated crystals is magnesium-dominant; itscomposition is: [Cе<sub>1.5</sub>La<sub>0.80.9</sub>Nd<sub>0.30.4</sub>Pr<sub>0.1</sub>(Gd+Sm+Tb+Dy)<sub>0.1</sub>Y<sub>0.2</sub>Sc<sub>0.1</sub>Ca<sub>0.70.8</sub>Na<sub>0.1</sub>]<sub>4</sub>(Mg<sub>0.5</sub>Fe<sup>3+</sup><sub>0.5</sub>)<sub>1</sub> (Fe<sup>3+</sup><sub>1.11.2</sub>Ti<sub>0.40.7</sub>Zr<sub>0.10.2</sub>Al<sub>0.10.2</sub>)<sub>2</sub>Ti<sub>2</sub>[(Si<sub>3.74</sub>Al<sub>0.30</sub>)<sub>4</sub>O<sub>22</sub>]. Сhevkinite-(Ce) from inclusions in allanite is poor in Mg, its formula is: [Cе<sub>1.51.7</sub>La<sub>0.60.9</sub>Nd<sub>0.50.6</sub>Pr<sub>0.1</sub>(Gd+Sm)<sub>0.1</sub>Y<sub>0.10.2</sub>Sc<sub>0.1</sub>Ca<sub>0.60.8</sub>Na<sub>0.1</sub>]<sub>4</sub> (Fe<sup>2+</sup><sub>0.61</sub>Mg<sub>00.1</sub>Fe<sup>3+</sup><sub>00.4</sub>)<sub>1</sub>(Ti<sub>0.80.9</sub>Fe<sup>3+</sup><sub>0.30.7</sub>Al<sub>0.20.4</sub>Zr<sub>00.2</sub>)<sub>2</sub>Ti<sub>2</sub>[(Si<sub>3.94</sub>Al<sub>0.10</sub>)<sub>4</sub>O<sub>22</sub>]. Perrierite-(Ce) composing idiomorphic crystals is magnesium-dominant, its composition is: [Cе<sub>1.21.6</sub>La<sub>0.60.8</sub>Nd<sub>0.30.4</sub>Pr<sub>0.1</sub> (Gd+Sm+Tb+Dy)<sub>0.1</sub>Y<sub>0.1</sub>Sc<sub>0.1</sub>Ca<sub>1.01.1</sub>Sr<sub>00.1</sub>Na<sub>0.1</sub>]<sub>4</sub>(Mg<sub>0.91</sub>Fe<sup>3+</sup><sub>0.10</sub>)<sub>1</sub>(Fe<sup>3+</sup><sub>1.01.2</sub>Al<sub>0.20.7</sub>Ti<sub>0.30.5</sub>Zr<sub>00.2</sub>)<sub>2</sub>Ti<sub>2</sub> [(Si<sub>3.94</sub>Al<sub>0.10</sub>)<sub>4</sub>(O<sub>21.321.5</sub>OH<sub>0.70.5</sub>)<sub>22</sub>]. Perrierite-(Ce) occurring inside allanite is poor in Mg, with theformula: [Cе<sub>1.31.5</sub>La<sub>0.70.8</sub>Nd<sub>0.30.5</sub>Pr<sub>0.1</sub>(Gd+Sm)<sub>0.1</sub>Y<sub>0.1</sub>Sc<sub>0.1</sub>Ca<sub>1.11.3</sub>Na<sub>0.1</sub>]<sub>4</sub>(Fe<sup>2+</sup><sub>0.40.5</sub>Fe<sup>3+</sup><sub>0.20.4</sub>Mg<sub>0.2</sub>)<sub>1</sub> (Al<sub>0.50.7</sub>Ti<sub>0.30.8</sub>Fe<sup>3+</sup><sub>0.30.9</sub>Zr<sub>0.10.3</sub>)<sub>2</sub>Ti<sub>2</sub>[(Si<sub>3.94</sub>Al<sub>0.10</sub>)<sub>4</sub>(O<sub>21.422</sub>OH<sub>0.60</sub>)<sub>22</sub>]. 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.</p>
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