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首页> 外文期刊>Contributions to Mineralogy and Petrology >Zircon saturation in silicate melts: a new and improved model for aluminous and alkaline melts
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Zircon saturation in silicate melts: a new and improved model for aluminous and alkaline melts

机译:硅酸盐熔体中的锆石饱和度:铝和碱性熔体的新改进模型

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The importance of zircon in geochemical and geochronological studies, and its presence not only in aluminous but also in alkaline rocks, prompted us to think about a new zircon saturation model that can be applied in a wide range of compositions. Therefore, we performed zircon crystallization experiments in a range of compositions and at high temperatures, extending the original zircon saturation model proposed by Watson and Harrison (Earth Planet Sci Lett 64: 295-304, 1983) and Boehnke et al. (Chem Geol 351: 324-334, 2013). We used our new data and the data from previous studies in peraluminous melts, to describe the solubility of zircon in alkaline and aluminous melts. To this effect, we devised a new compositional parameter called G[(3 center dot Al2O3 + SiO2)/(Na2O + K2O + CaO + MgO + FeO)] (molar proportions), which enables to describe the zircon saturation behaviour in a wide range of rock compositions. Furthermore, we propose a new zircon saturation model, which depends basically on temperature and melt composition, given by (with 1 sigma errors): ln [Zr] = (4.29 +/- 0.34) - (1.35 +/- 0.10) center dot ln G+ (0.0056 +/- 0.0002) center dot T(degrees C) where [Zr] is the Zr concentration of the melt in mu g/g, G is the new parameter representing melt composition and T is the temperature in degrees Celsius. The advantages of the new model are its straightforward use, with the G parameter being calculated directly from the molar proportions converted from electron microprobe measurements, the temperature calculated given in degrees Celsius and its applicability in a wider range of rocks compositions. Our results confirm the high zircon solubility in peralkaline rocks and its dependence on composition and temperature. Our new model may be applied in all intermediate to felsic melts from peraluminous to peralkaline compositions.
机译:锆石在地球化学和地球年代学研究中的重要性以及其不仅存在于铝质而且还存在于碱性岩石中,这促使我们考虑一种可以应用于各种成分的新型锆石饱和度模型。因此,我们在一定范围的成分和高温下进行了锆石结晶实验,扩展了Watson和Harrison(Earth Planet Sci Lett 64:295-304,1983)和Boehnke等人提出的原始锆石饱和模型。 (Chem Geol 351:324-334,2013)。我们使用我们的新数据和以前在高铝熔体中研究的数据来描述锆石在碱性和铝熔体中的溶解度。为此,我们设计了一个新的组成参数G [(3个中心点Al2O3 + SiO2)/(Na2O + K2O + CaO + MgO + FeO)](摩尔比),该参数可以描述大范围的锆石饱和行为。岩石成分范围。此外,我们提出了一个新的锆石饱和度模型,该模型基本上取决于温度和熔体成分,由(具有1 sigma误差)给出:ln [Zr] =(4.29 +/- 0.34)-(1.35 +/- 0.10)中心点ln G +(0.0056 +/- 0.0002)中心点T(摄氏度),其中[Zr]是熔体的Zr浓度,单位为g g / g,G是代表熔体成分的新参数,T是以摄氏度为单位的温度。新模型的优点是直接使用,G参数直接根据电子探针测量得到的摩尔比计算得出,G以摄氏度给出的计算温度及其在更广泛的岩石成分中的适用性。我们的结果证实了锆石在高碱性岩石中的高溶解度及其对成分和温度的依赖性。我们的新模型可能适用于从高铝组成到高碱性组成的所有中等至长质熔体。

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