Cr-rich Allanite-(Ce): the First Finding in Kimberlites
UDC 549.618.6 : 552.323.6 (477)
https://doi.org/10.15407/mineraljournal.37.03.045
O.A. Vyshnevskyi
M.P. Semenenko Institute of Geochemistry, Mineralogy and Ore Formation of the NAS of Ukraine
34, Acad. Palladina Pr., Kyiv-142, Ukraine, 03680
E-mail: vyshnevskyy@i.ua
Cr-rich Allanite-(Ce): the First Finding in Kimberlites
Language: Russian
Mineralogical journal 2015, 37 (3): 45-50
Abstract: The first finding of Cr-rich allanite-(Ce) in kimberlites is described. It was discovered in pipe Pivdenna (East Azov region, Ukraine). The grain about 200 × 100 μm in size, composed of microcrystal’s aggregate, intergrowth with chromian pyrope (3.5 % Cr2O3, 4.9 % CaO, XMg[Mg/(Mg + Fe)] = 0.86) and Al-rich enstatite (7.5 % Al2O3, 2.9 % Cr2O3, XMg = 0.12). The mineral is characterized by low Al content (8.3 % Al2O3), enrichment in chromium and iron (4.2 % Cr2O3, 17.4 % FeO) and has cerium specialization (27.0 % ΣREE, Се/ΣREE = 0.50, La/Ce = 0.70). Its crystal-chemical formula: Ca1.006 × (La0.345Ce0.491Pr0.060Nd0.094)0.990(Mg0.176Mn0.009Fe2+ 0.876Fe3+ 0.575Cr0.329Al0.972Ti0.028)1.993Si3.039O12(OH). It is assumed that the described high-chromium allanite-(Ce) was formed during REE-metasomatism of pyropes lherzolites under the upper mantle conditions.
Keywords: Cr-rich allanite-(Ce), first finding, kimberlites, East Azov region, upper mantle REE-metasomatism.
References:
1. Dawson, J.B. (1983), Kimberlites and their xenoliths, Mir, Moscow, 300 p.
2. Lazarenko, E.K., Lavrinenko, L.F., Buchinskaya, N.I., Galiy, S.A., Voznyak, D.K., Galaburda, Yu.A., Zatsiha, B.V., Ivanova, A.V., Kvasnytsya, V.M., Kulchytska, G.O., Kuts, V.P., Melnikov, V.S., Pavlyshyn, V.I. and Turkevich, G.I. (1981), Mineralogy of Azov region, Nauk. dumka, Kyiv, 432 p.
3. Matsyuk, S.S., Patrin, G.S. and Cherenkova, A.F. (2006), Prognosing and searching of diamond deposits, Proc. of 2nd Intern. conf., Simferopol-Yalta, Sept. 20-26, 2004, UkrDGRI, Kyiv, pp. 336-339.
4. Tsymbal, S.N., Tatarintsev, V.I. and Knyazkov, A.P. (1996), Mineral. Journ. (Ukraine), Kyiv, Vol. 18 No 5, pp. 18-45. 5. Shcherbakov, I.B. (2005), Petrology of the Ukrainian Shield, ZUKC, Lvov, 366 p.
6. Anashkin, S., Bovkun, A., Bindi, L., Garanin, V. and Litvin, Y. (2013), Miner. Mag., Vol. 77, pp. 327-334. https://doi.org/10.1180/minmag.2013.077.3.06
7. Armbruster, T., Bonazzi, P., Akasaka, M., Bermanec, V., Chopin, C., Giere, R., Heuss-Assbichler, S., Liebscher, A., Menchetti, S., Pan, Y. and Pasero, M. (2006), Eur. J. Miner., Vol. 18, pp. 551-567. https://doi.org/10.1127/0935-1221/2006/0018-0551
8. Brey, G.P. and Kohler, T. (1990), J. Petrol., Vol. 31, pp. 1353-1378. https://doi.org/10.1093/petrology/31.6.1353
9. Deer, W.A., Howie, R.A. and Zussman, J. (1997), Rock-forming minerals, Vol. 1b, Alden Press, Oxford, pp. 151-179.
10. Droop, G.T.R. (1987), Miner. Mag., Vol. 51, pp. 431-435. https://doi.org/10.1180/minmag.1987.051.361.10
11. Enami, M., Ueno, T. and Maekawa, H. (2011), J. Miner. Petrol. Sci., Vol. 106, pp. 103-108. https://doi.org/10.2465/jmps.101015
12. Giere, R. and Sorensen, S.S. (2004) Revs Mineral. and Geochem., Vol. 56, pp. 431-493. https://doi.org/10.2138/gsrmg.56.1.431
13. Haggerty, S.E., Smyth, J.R., Erlank, A.J., Rickard, R.S. and Danchin, R.V. (1983), Amer. Miner., Vol. 68, pp. 494-505.
14. Hermann, J. (1999), Ninth Annual V.M. Goldshmidt conf., LPI Contribution No. 971, p. 122.
15. MacGregor, I.D. (1974), Amer. Miner., Vol. 59, pp. 110-119.
16. Sorensen, S.S. (1991), Amer. Miner., Vol. 76, pp. 589-601.
17. Yang, J. and Enami, M. (2003), Amer. Miner., Vol. 88, pp. 604-610. https://doi.org/10.2138/am-2003-0414