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REDOX STATE OF ILMENITES AND OLIVINES FROM KIMBTRLITE PROVINCE OF YAKUTIA
Zharkova E.V. (GEOCHI, RAS), Kadik A.A. (GEOCHI, RAS), Senin V.G. (GEOCHI, RAS), Genshaft Y.S. (IPE, RAS), Saltikovskii A.Ya. (IPE, RAS)
kadik@geocyi.ru; fax: (095)-938-20-54; phone (095) 39-70-78

We took seven samples of ilmenites and two olivines of the 1-st and kimberlite province of Yakutia, and one sample of Libyan glass from the M.A. for our investigation. The experiments of determination of intrinsic oxygen fugacity (fO2) temperature furnace based on two solid electrolytes. The description of the the experimentes are in the table. Ilm-811 Ilm-836 Ilm-1142 Ilm-782 Ilm-792 Ilm-539 Ilm-543 Ol - 1 Ol - 2 Gl-790 Sample Daldinskoe field, Udachnaya-west pipe Daldinskoe field, Udachnaya-east pipe Daldinskoe field, Zarnitca pipe Daldinskoe field, Dalnaya pipe, schurf 52 East Ukukitskoe fied, Kubanskaya pipe Merchimdenskoe field, Operatorskaya south pipe Merchimdenskoe field, Operatorskaya north pipe Udachnaya pipe, 1-st generation Udachnaya pipe, 2-d generation Libyan glass 34.073 43.421 21.700 25.075 12.832 21.529 14.580 6.913 14.327 17.735

the 2-d generations from collection of dr. Nazarov were carried out on high samples and the results of r 0.986 0.989 0.990 0.985 0.990 0.983 0.980 0.994 0.991 0.864 n 9 9 8 8 8 6 9 9 9 13

57469.2 67214.7 43795.7 48272.6 32093.2 41860.9 32924.2 27181.9 35567.0 36783.2

The results of experiments describes by linear dependence log fO2 = A ­ B/T°K (table, where "r" ­ correlation coefficient, and "n" the quantity of experimental points). We can make the conclusion that the intrinsic oxygen fugacity for the most of ilmenites and the glass is between WM and QFM buffer equilibria at 800°C-1050°C. The intrinsic oxygen fugacity for the ilmenites from the Udachnaya pipe lay in the field of QFI at 800°C and in the field of QFM at 1050°C. The fO2 for the olivine of the 1-st generation practically coincide with the WM buffer equilibrium and the intrinsic oxygen fugacity of the olivine of the 2-d generation lays in the field between IW and WM buffer equilibria. The temperature of the equilibrium for the olivine and the ilmenite of Udachnaya pipe is between 814°C - 858°C. The investigation was supported by RFFI grant No 02-05-64735.
Electronic Scientific Information Journal "Herald of the Department of Earth Sciences RAS" 1(21)2003 Informational Bulletin of the Annual Seminar of Experimental Mineralogy, Petrology and Geochemistry ­ 2003 URL: http://www.scgis.ru/russian/cp1251/h_dgggms/1-2003/informbul-1_2003/magm-2e.pdf Published on July 15, 2003 © Department of the Earth Sciences RAS, 1997-2003 All rights reserved