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Experimental study of intracrystalline Fe2+-Mg exchange in three augite crystals: Effect of composition on geothermometric calibration
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Elisabetta Brizi
Published/Copyright:
March 25, 2015
Abstract
Three augite crystals with differing chemical compositions [Fonualei dacite lava flow, Tonga (Fon39) (En36Fs27Wo37), Alicudi andesitic dike (KC) (En46Fs11Wo43), and Vulcano basalt dike (PD30) (En42Fs12Wo46)] were equilibrated over the temperature range 700-1100 °C through both disordering and ordering reactions (“reversal technique”) and then quenched at room temperature. Following each experiment, the partitioning of Fe2+-Mg between M1 and M2 sites of clinopyroxene was determined by single-crystal structure refinement. The Fe2+-Mg partitioning data of the order-disorder reaction, Fe2+M2 + MgM1 = Fe2+M1 + MgM2, in terms of the partition coefficient KD{= [(Fe2+M1)(MgM2)/(Fe2+M2)(MgM1)]}, were then used to calibrate the following geothermometric equations:
-lnKD = 2727 (±132)/T(K) - 0.383 (±0.113); (r = 0.99)
-lnKD = 4204 (±214)/T(K) - 1.570 (±0.183); (r = 0.98)
-lnKD = 5305 (±351)/T(K) - 2.428 (±0.289); (r = 0.98)
respectively for Fon39, KC, and PD30. A situation in which thermodynamic parameters depend on crystal composition may be envisaged. It should be noted that such dependence is essentially controlled by the (Ca+Na) and R3+ contents of the clinopyroxene. On the basis of compositional dependence, the following geothermometric equation is proposed:
T(K) = [12100 (750) - 27700 (1700)(Ca + Na + R3+) + 20400 (1000)(Ca + Na + R3+)2]/[-lnKD + 7.1 (0.6) - 20.3 (1.4)(Ca + Na + R3+) + 15.2 (0.8)(Ca + Na + R3+)2]
Received: 1999-12-21
Accepted: 2000-5-23
Published Online: 2015-3-25
Published in Print: 2000-10-1
© 2015 by Walter de Gruyter Berlin/Boston
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Articles in the same Issue
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