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首页> 外文期刊>Contributions to Mineralogy and Petrology >Numerical modeling of major element distribution between chromian spinel and basaltic melt, with application to chromian spinel in MORBs
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Numerical modeling of major element distribution between chromian spinel and basaltic melt, with application to chromian spinel in MORBs

机译：铬尖晶石与玄武岩熔体之间主要元素分布的数值模拟及其在MORB中的铬尖晶石中的应用

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摘要

A set of empirical equations is developed which allows calculation of chromian spinel composition in equilibrium with a basaltic melt under a known set of conditions. These equations are calibrated with published experimental data for the temperature range from 1,093 to 1,490 °C and a pressure of up to 20 kbar. It is demonstrated that the composition of chromian spinel from the experiments, which crystallizes from basaltic, boninitic, and komatiitic melt and varies from high-Al to high-Cr, and high-Fe3+ can be successfully reproduced using the suggested model. The composition of chromian spinel has been calculated using the glass composition for a set of primitive basaltic lavas using the suggested set of empirical equations. Good agreement between the calculated composition and composition of rims of chromian spinel included in glass is achieved for compositionally diverse spinel from a Hawaiian sample and 15 MORB samples. The Fe2O3 content in the chromian spinels is, however, often variable and higher than the calculated Fe2O3 content. Additional calculations using 76 published MORB glass analyses reproduced most of the MORB chromian spinel range, except for the most Cr- and Mg-rich. The crystallization of these Cr-rich chromian spinels likely occurred from a more primitive Al-poor melt than that of the 76 MORB glasses. An example of a more primitive glass can occasionally be found as glass inclusions in these Cr- and Mg-rich chromian spinel microphenocrysts.
机译：建立了一组经验方程，可以计算在已知条件下与玄武岩熔体平衡时的铬尖晶石成分。这些方程式已用已发布的实验数据校准，温度范围为1,093至1,490°C，压力最高为20 kbar。结果表明，利用该模型可以成功地重现铬spin尖晶石的成分，该成分从玄武质，邦尼特质和科马蒂特质熔体中结晶出来，并从高铝到高铬变化，并且高铁含量。 。铬尖晶石的成分已使用建议的一组经验方程式，使用一组原始玄武岩熔岩的玻璃成分进行了计算。对于来自夏威夷样品和15个MORB样品的各种组成的尖晶石，在计算出的组成与玻璃中包含的铬尖晶石的边缘组成之间达成了很好的一致性。然而，铬尖晶石中的Fe2 O3 含量经常变化且高于计算得出的Fe2 O3 含量。使用76种已发表的MORB玻璃分析进行的其他计算重现了MORB铬尖晶石的大部分范围，但铬和镁的含量最高。这些富铬铬尖晶石的结晶可能是由比76 MORB玻璃更原始的贫铝熔体产生的。在这些富含Cr和Mg的铬尖晶石微细晶中，玻璃夹杂物有时会发现一种更原始​​的玻璃。

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    《Contributions to Mineralogy and Petrology》 |2001年第1期|58-71|共14页
  • 作者

    A. Poustovetov; P. Roeder;

  • 作者单位

    Department of Geological Sciences and Geological Engineering Queen's University Kingston Ontario K7L 3N6 Canada;

    Department of Geological Sciences and Geological Engineering Queen's University Kingston Ontario K7L 3N6 Canada;

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