The paper presents a mineralogical description of Sr-bearing phosphates of the apatite supergroup found in eudialyte-aegirine-albite rocks of the Konder pluton, Khabarovsk krai. The Sr-dominant phases are associated with minerals of the lamprophyllite group and titanite, whereas the Ca-dominant phases are associated with calciocatapleite and kainosite-(Y), which are the products of the decomposition of eudialyte. The phosphates probably formed during post-magmatic alteration of host rock in a following sequence: stronadelphite > fuorostrophite > Sr-rich fuorapatite (fuorocaphite) > Na-REE-fuorapatite. Their variable chemical composition indicates decreasing Sr, Ba and F contents and increasing Ca, Na, REE and (OH) contents during crystallization. The crystallization sequence could refect a decrease in alkalinity of the mineral-forming conditions.

Keywords: stronadelphite, fuorostrophite, fuorocaphite, Sr-rich fuorapatite, fuorapatite, alkaline rocks, hydrothermal alterations, Konder pluton, alkaline-ultramafc complexes.

Received 16.08.2021, accepted 03.12.2021

A.S. Osipov, St. Petersburg State University, St. Petersburg, Universitetskaya nab. 7-9, 199034 Russia; osipov.anst@yandex.ru 

A.A. Antonov, Karpinsky Russian Geological Research Institute (VSEGEI), St. Petersburg, Sredny pr. 74, 199016 Russia

N.S. Vlasenko, St. Petersburg State University, St. Petersburg, Universitetskaya nab. 7-9, 199034 Russia

1. Bulakh A.G., Zolotarev A.A., Krivovichev V.G.(2014) [Structures, isomorphism, formulas, classifcation of minerals]. St. Petersburg, SPbGU, 133 p. (in Russian).
2. Chakhmouradian A.R., Reguir E.P., Mitchell R.H.(2002) Strontium–apatite: new occurrences, and the extent of Sr-for-Ca substitution in apatite-group minerals. The Canadian Mineralogist, 40, 121–136.
3. Chakhmouradian A.R., Huges J.M., Rakovan J.(2005) Fluorcaphite, a second occurrence and detailed structural analysis: simultaneous accommodation of Ca, Sr, Na, and LRee in the apatite atomic arrangement. The Canadian Mineralogist, 43, 735–746.
4. Efmov A.F., Kravchenko S.M., Vasil’eva Z.V. (1962) [Strontium-apatite – a new mineral]. Doklady Akademii nauk SSSR [Doklady of Academy of Sciences of the USSR], 142, 439–442 (in Russian)
5. Gurevich D.V., Belogub Е.V., Petrov S.V., Poloniankin А.А., Zabotina М.V. (2020) [Formation model of Cu-Pt-Pd mineralization in the Uralian-Alaskan-type Konder Pt-bearing pluton, Khabarovsk krai, Russia]. Porodo-, mineralo- i rudoobrazovanie: dostizheniya i perspektivy issledovanij. Trudy k 90-letiyu IGEM RAN [Rock, mineral and ore formation: achievements and prospects of research. Proceedings for the 90th anniversary of the IGEM RAS]. Moscow, IGEM RAN, 87–90. (in Russian)
6. Gurevich D.V., Polonyankin А.А. (2016) [Sulfde polymineral ores of the Konder pluton, Khabarovsk krai: geological setting]. In: Problemy geologii i ekspluatatsii mestorozhdenii platinovykh metallov [Problems of Geology and Exploitation of Platinum Metal Deposits]. St. Petersburg, SPbGU, 27–46. (in Russian)
7. Gurovich V.G., Emel’yanenko E.P., Zemlyanukhin V.N., Karetnikov A.S., Kvasov A.I., Lazarenkov V.G., Malich K.N., Mochalov A.G., Prikhodko V.S., Stepashko A.A. (1994) [Geology, petrology and ore mineral resources of the Konder pluton]. Moscow, Nauka, 176 p. (in Russian).
8. Karetnikov A.S. [Age and genesis of platinoid mineralization of the Konder pluton: paleomagnetic and radioisotope data]. Litosfera [Litosphere], 3, 96-107. (in Russian).
9. Khomyakov A.P., Kulikova I.M., Rastsvetaeva R.K. (1997) [Fluorcaphite Ca(Sr,Na,Ca)(Ca,Sr,Ce)3 (PO4)3F – a new mineral with an apatite-like structural motif]. Zapiski RMO [Proceedings of the Russian Mineralogical Society], 126(3), 87–97 (in Russian).
10. Klevtsova R.F. (1964) [Crystal structure of strontium-apatite]. Zhurnal strukturnoi khimii [Journal of Structural Chemistry], 5(2), 318–320. (in Russian)
11. Kropáč K., Dolníček Z., Uher P., Urubek T. (2017) Fluorcaphite from hydrothermally altered teschenite at Tichá, Outer Western Carpathians, Czech Republic: compositional variations and origin. Mineralogical Magazine, 81(6), 1485–1501.
12. Lazarenkov V.G., Malich K.N., Sakh’yanov L.O.(1992) [Platinum ore mineralization of zonal ultramafc and komatiite plutons]. Leningrad, Nedra, 217 p. (in Russian).
13. Liferovich R.P., Mitchell R.H. (2006) Apatite-group minerals from nepheline syenite, Pilansberg alkaline complex, South Africa. Mineralogical Magazine, 70(5), 463–484.
14. Malich K.N. (1999) [Platinoids of the clinopyroxenite–dunite massifs of Eastern Siberia: geochemistry, mineralogy, genesis]. St. Petersburg, VSEGEI, 296 p. (in Russian).
15. Mochalov A.G. (2019) [Remarkable Pt minerals of the Konder pluton (Khabarovsk krai, Russia)]. Mineralogicheskiy almanakh [Mineralogical Almanac], 23(3), 128 p. (in Russian).
16. Nekrasov I.Ya., Lennikov A.M., Oktyabrsky R.A. (1994) [Petrology and Pt-bearing potential of the ring alkaline ultramafc complexes]. Moscow, Nauka, 381 p. (in Russian).
17. Orlova M.P. (1991) [Geological structure and genesis of the Konder ultramafc pluton]. Tikhookeanskaya geologiya [Pacifc Geology], 1, 80–88 (in Russian).
18. Osipov A.S., Antonov A.A. (2021) [Galgenbergite-(Се) from the alkaline rocks of the Konder pluton, Khabarovsk krai]. Trudy Fersmanovskoi nauchnoi sessii GI KNTs RAN [Proceedings of the Fersman Scientifc Session of the Geological Institute KSC RAS], 18, 326–331 (in Russian).
19. Osipov A.S., Antonov A.A., Bocharov V.N., Vlasenko N.S. (2021) [Stronadelphite from the alkaline rocks of the Konder pluton (Khabarovsk krai)]. Zapiski RMO [Proceedings of the Russian Mineralogical Society], 150(3), 67–78. (in Russian).
20. Osipov A.S., Antonov A.A., Panikorovskii T.L., Zolotarevjr A.A. (2018) Hydrated CO3-bearing analog of manganoeudialyte from alkali pegmatites of the Konder pluton, Khabarovsk krai. Geology of Ore Deposits, 60(8), 1–10.
21. Pasero M., Kampf A.R., Ferraris C., Pekov I.V., Rakovan J., White T.J. (2010) Nomenclature of the apatite supergroup minerals. European Journal of Mineralogy, 22, 63–179.
22. Pekov I.V. (1998) [Y mineralization in the Khibiny–Lovozero alkaline complex, Kola Peninsula]. Zapiski RMO [Proceedings of the Russian Mineralogical Society], 127(5), 66–85 (in Russian).
23. Pekov I.V., Chukanov N.V., Eletskaya O.V., Khomyakov A.P., Menshikov Yu.P. (1995) [Belovite-(Ce): new data, refned formula and relationships with other minerals of the apatite group]. Zapiski VMO [Proceedings of the All-Russian Mineralogical Society], 124(2), 98–110 (in Russian).
24. Pekov I.V., Kulikova I.M., Kabalov Yu.K., Eletskaya O.V., Chukanov N.V., Menshikov Yu.P., Khomyakov A.P. (1996) [Belovite-(La), Sr3Na(La,Ce)[PO4]3(F,OH) – a new rare earth mineral of the apatite group]. Zapiski VMO [Proceedings of the Russian Mineralogical Society], 125(3), 101–109 (in Russian).
25. Pekov I.V., Britvin S.N., Zubkova N.V., Pushcharovsky D.Yu., Pasero M., Merlino S. (2010) Stronadelphite, Sr5(PO4)3F, a new apatite-group mineral. European Journal of Mineralogy, 22, 869–874.
26. Petrov S.V., Borozdin A.P., Polekhovsky Yu.S., Tarasova I.P. (2016) [Sequence of mineral formation in sulfde-platinum-metal ores in kosvites of the Konder pluton]. Problemy geologii i ekspluatatsii mestorozhdenii platinovykh metallov [Problems of Geology and Exploitation of Platinum Metal Deposits]. St. Petersburg, SPbGU, 16–21.
27. Pilyugin A.G., Bugaev I.A. (2016) [General issues of geology of Cu-Pt-Pd mineralization of the Konder pluton, Far East of Russia]. Problemy geologii i ekspluatatsii mestorozhdenii platinovykh metallov [Problems of Geology and Exploitation of Platinum Metal Deposits]. St. Petersburg, St. Petersburg State University, 22–26.
28. Pushcharovsky D.Yu., Nadezhina T.N., Khomyakov A.P. (1987) [Crystal structure of strontium-apatite from Khibiny]. Kristallografya [Crystallography], 32, 891–895 (in Russian)
29. Yakovenchuk V.N., Ivanyuk G.Yu., Pakhomovsky Ya.A., Men’shikov Y.P. (1999) [Minerals of the Khibiny pluton]. Moscow, Zemlya, 326 p. (in Russian).