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首页> 外文期刊>Meteoritics & planetary science >Partitioning of Ca and Al between forsterite and silicate melt in dynamic systems with implications for the origin of Ca, Al-rich forsterites in primitive meteorites
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Partitioning of Ca and Al between forsterite and silicate melt in dynamic systems with implications for the origin of Ca, Al-rich forsterites in primitive meteorites

机译：Ca和Al在动态系统中的镁橄榄石和硅酸盐熔体之间的分配，对原始陨石中富含Ca，Al的镁橄榄石的起源具有影响

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摘要

We report the results of dynamic crystallization experiments that were specifically designed to study the dependence of Ca and Al partitioning between forsterite and melt in rapidly cooling Ca-and Al-rich melts. The partitioning of Ca between olivine and silicate melt is found to be independent of the cooling rate within the range of 1.5 to 1000°C/hr and at CaO contents of up to 25 wt%. Within analytical uncertainty, our data plot on the equilibrium partitioning curve obtained by Libourel (1999). The partitioning behavior of Al at high cooling rates is more complex. Aluminum is much more heterogenously distributed in the olivine and the co-existing melt than Ca. But, no systematic trend of Al partition coefficient with cooling rate is observed. We apply the results of the experiments to the formation of meteoritic forsterites with relatively high contents of Ca and Al. Although these forsterites are found frequently inside chondrules, the Ca contents of their host chondrules are far too low to crystallize these high Ca-forsterites. This is also true for very rapid cooling of chondrule melts. The parental melt of these forsterites requires CaO contents above 20 wt%.
机译：我们报告了动态结晶实验的结果，该实验专门设计用于研究钙和铝在镁橄榄石和熔融物中的分配在快速冷却富含钙和铝的熔融物中的依赖性。发现Ca在橄榄石和硅酸盐熔体之间的分配与冷却速率在1.5至1000℃/ hr的范围内无关，并且在CaO含量高达25wt％时。在分析不确定性范围内，我们的数据绘制在Libourel（1999）获得的平衡分配曲线上。 Al在高冷却速率下的分配行为更为复杂。铝比钙更不均匀地分布在橄榄石和共存的熔体中。但是，没有观察到Al分配系数随冷却速率的系统趋势。我们将实验结果应用于钙和铝含量较高的陨石镁橄榄石的形成。尽管这些镁橄榄石经常在软骨中发现，但它们的寄主软骨中的钙含量仍然太低，无法使这些高钙镁橄榄石结晶。对于软骨熔体的非常快速的冷却也是如此。这些镁橄榄石的母体熔体需要CaO含量高于20 wt％。

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