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首页> 外文期刊>Contributions to Mineralogy and Petrology >Ferric iron partitioning between plagioclase and silicate liquid: thermodynamics and petrological applications
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Ferric iron partitioning between plagioclase and silicate liquid: thermodynamics and petrological applications

机译：铁在斜长石和硅酸盐液体之间的分配：热力学和岩石学应用

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A series of Fe and Mg partition experiments between plagioclase and silicate liquid were performed in the system SiO_2-Al_2O_3-Fe_2O_3-FeO-MgO-CaO-Na_2O under oxygen fugacities from below the IW buffer up to that of air. A thermodynamic model of plagioclase solid solution for the (CaAl,NaSi,KSi)(Fe~(3+) ,Al~(3+))Si_2O_8-Ca(Fe~(2+) ,Mg)Si_3O_8 system is proposed and is calibrated by regression analysis based on new and previously reported experimental data of Fe and Mg partitioning between plagioclase and silicate liquid, and reported thermodynamic properties of end members, ternary feldspar and silicate liquid. Using the derived thermodynamic model, FeO~t, MgO content and Mg/(Fe~t + Mg) in plagioclase can be predicted from liquid composition with standard deviations of +0.34 wt percent (relative error =9 percent) and +0.08 wt percent (14 percent) and +-0.7 (8 percent) respectively. Calculated Fe~(3+) -Al exchange chemical potentials of plagioclase, #mu#_(Fe~(3+)(Al)_(-1))~(Pl) agree with those calculated using reported thermodynamic models for multicom-ponent spinel, #mu#_(Fe~(3+)(Al)_(-1))~(Sp) and clinopyroxene, #mu#_(Fe~(3+)(Al)_(-1))~(Cpx). The FeO~t content of plagioclase coexisting with spinel or clinopyroxene is affected by Fe~(3+)/( Fe~(3+) + Al) and Mg/ (Fe + Mg) of spinel or clinopyroxene and temperature, while it is independent of the anorthite content of plagioclase. Three oxygen barometers based on the proposed model are investigated. Although the oxygen fugacities predicted by the plagioclase-liquid oxygen barometer are scattered, this study found that plagioclase-spinel-clinopyroxene-oxygen and plagioclase-olivine-oxygen equilibria can be used as practical oxygen barometers. As a petrological application, prediction of plagioclase composition and f_(O2) are carried out for the Upper Zone of the Skaergaard intrusion. The estimated oxygen fugacities are well below QFM buffer and consistent with the estimation of oxidization states in previous studies.
机译：在IW缓冲液以下至空气中的氧逸度下，在SiO_2-Al_2O_3-Fe_2O_3-FeO-MgO-CaO-Na_2O系统中进行了斜长石和硅酸盐液体之间的一系列Fe和Mg分配实验。提出了（CaAl，NaSi，KSi）（Fe〜（3+），Al〜（3 +））Si_2O_8-Ca（Fe〜（2 +），Mg）Si_3O_8系统斜长石固溶体的热力学模型。根据新的和先前报道的斜长石和硅酸盐液体之间的铁和镁分配实验数据，通过回归分析进行校准，并报告端基，三元长石和硅酸盐液体的热力学性质。使用导出的热力学模型，斜长石中的FeO〜t，MgO含量和Mg /（Fe〜t + Mg）可以从液体组成预测，标准偏差为+0.34 wt％（相对误差= 9％）和+0.08 wt％ （14％）和+ -0.7（8％）。斜长石，＃mu #_（Fe〜（3 +）（Al）_（-1））〜（Pl）的计算的Fe〜（3 +）-Al交换化学势与使用报告的多组分热力学模型计算的相符。尖晶石#mu #_（Fe〜（3 +）（Al）_（-1））〜（Sp）和斜cl基，#mu #_（Fe〜（3 +）（Al）_（-1）） 〜（Cpx）。 Fe〜（3 +）/（Fe〜（3+）+ Al）和Mg /（Fe + Mg）的尖晶石或斜发py铁与斜spin石或斜发rox铁共存的斜长石的FeO〜t含量受温度影响与斜长石的钙长石含量无关。研究了基于该模型的三种氧气气压计。尽管斜长石-液氧晴雨表预测的氧逸散度是分散的，但本研究发现斜长石-尖晶石-斜py-环氧丙烷和斜长石-橄榄石-氧平衡可以用作实际的氧晴雨表。作为岩石学应用，对Skaergaard侵入岩的上部区域进行了斜长石组成和f_（O2）的预测。估计的氧逸度远低于QFM缓冲液，并且与先前研究中的氧化态估计相符。

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