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The third international conference «Mafic-ultramafic complexes of fold ed regions and related d eposits»

2. .., .. - : II. // . 2005. 7. . 712-732. 3. Ariskin A.A., Nikolaev G.S. An empirical model for the calculation of spinel-melt equilibrium in mafic igneous systems at atmospheric pressure: I. Chromian spinels // Contrib. Mineral. Petrol. 1996. V. 1 23. P. 282-292.

- .., .. , , e-mail: gsnikolaev@rambler.ru, ariskin@rambler.ru RECONSTRUCTION OF THE PARENTAL MAGMA COMPOSITION OF THE BURAKOVO-AGANOZERO LAYERED MASSIF IN THE TRANS-ONEGA AREA BY GEOCHEMICAL THERMOMETRY TECHNIQUES Nikolaev G.S., Ariskin A.A. Institute of Geochemistry and Analytical Chemistry RAS, Moscow, Russia e-mail: gsnikolaev@rambler.ru, ariskin@rambler.ru By means of numerical simulation of the equilibrium crystallization of the compositions of marginal-series rocks by the COMAGMAT-3.0 computer program, the temperature was estimated at slightly higher than 1300°C, and the composition of parental melt was reconstructed. The parental melt wa s chemically close to the volcanics of the Vetreny Belt, which provides additional arguments in favor of the comagmatic character of these rocks. : (1) ; (2) ; (3) , [3], - , () [1]. , , . . [4]. . [5]. . , . , , . , , .. , . , 86


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50 () - . - . 20 40 - A GL -30 - . 67 COMAGMAT-3.0 [1]. - SHL 20 - LV R* - LVR - KPD - K P D* . 10 0 0 5 10 15 20 F eO , . % - . 1. , «» - . ( ) . , , ­ , , . - [1, 6], , , [2]. , , . , - , . - , : Ol. , ( ) , , , «» ­ . , Ol, . - , , Fo87. , , . . 25 45 .% MgO FeO, CaO SiO2, , , . : 20 67. 9 , 4 . 20 5 . 67. , 6 , . WM. -

MgO, .%

87


The third international conference «Mafic-ultramafic complexes of fold ed regions and related d eposits»

1 - (.% )
SiO2 TiO2 Al2O3 FeO MnO MgO CaO Na2O K2O P2 O 5 Fe/Mg Ca/Al T, °C Fo, .% LVR [4] 49. 96 0.47 12. 08 9.55 0.16 16. 62 7.66 2.42 0.32 0.06 0.58 0.63 ­ ­ KPD [5] 47.05 0. 38 7. 76 10.24 0. 14 27.46 5. 13 1. 51 0. 29 0. 03 0. 38 0. 66 ­ ­ 51 0. 12 10 0. 11 11 1. 0. 0. AGL .36 (1.00) 70 (0.15) .58 (1.02) .84 (0.19) 16 (0.02) .06 (0.19) .22 (0.19) 68 (0.52) 36 (0.24) 05 (0.01) 0. 97 0. 90 1303 (18) 87.04 54 0. 12 9. 0. 11 9. 1. 0. 0. SHL .28 (1.6 3) 77 (0.06) .11 (0.2 1) 74 (0.30) 16 (0.04) .27 (0.5 7) 50 (1.05) 67 (0.31) 50 (0.14) 05 (0.02) 0. 87 0. 77 1323 ( 26) 88.03 LVR* 52.79 0. 59 15.19 8. 91 0. 17 9. 19 9. 64 3. 04 0. 40 0. 08 0. 96 0. 63 1281 87 KP D* 53.65 0. 75 15.38 8. 00 0. 15 8. 28 10.17 2. 99 0. 57 0. 06 0. 96 0. 66 1250 87

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( ), . 1. ­ AGL, ­ SHL . SiO2 , 11 % gO ­ (AGL) / - (SHL). , . , Fo87-88 . , , . ( ), ­ , . , (. 1) «» , «» Ol. 4- . 20 ( ) Fo86±0.3. 5- . 67 ( ) Fo88±0.6 ( ). , Fo87-88, FeO MgO . , FeO-MgO KD Fe-Mg ­ 0.29 0.33. , , FeO MgO . MgO . . , : .. [4] .. - [5] (LVR KPD, , . 1). «» . 88


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LVR KPD 87. , ( , = 6 , WM). LVR* KPD* . 1. Fo87 19.9 49.5 .%, . . TiO2 K2O. , , - . 21 .%, ­ 53 .%. [7], (35-40 .%) LVR , KPD «» . - , .. [3] , - , . - . (MgO<11%) , . - . .
08-05-00194. 1. .., .. . .: , 2000. 365 . 2. .., .., .. ( , ) // . 2003. 2. . 1-25. 3. .., .. . (.-. // . 2005. 5. . 516-537. 4. .. // . : , 1994. . 6-41. 5. .., - .., .. . - // . 1996. . 347. 6. . 799-801. 6. .., .., .. . . .: , 1988. 216 . 7. .., .. - : II. // . 2005. 7. . 712-732.

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