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首页> 外文期刊>Contributions to Mineralogy and Petrology >Fractional crystallization of hydrous basaltic 'arc-type' magmas and the formation of amphibole-bearing gabbroic cumulates
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Fractional crystallization of hydrous basaltic 'arc-type' magmas and the formation of amphibole-bearing gabbroic cumulates

机译：含水玄武岩“弧型”岩浆的部分结晶和含闪石的辉长岩堆积物的形成

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摘要

The Rymmen and Eriksberg gabbros preserve the crystallization products of hydrous basaltic liquids, ranging from anorthosite and troctolite to highly fractionated oxide gabbro, diorite, and leucotonalite. The high initial water content of the liquids that filled the magma chambers (1.5-3 wt percent) allowed amphibole to saturate as an interstitial mineral even in the earliest formed cumulates. The increasing water content of the system helped to produce a thick sequence of cumulates with anorthitic plagioclase (An_(87-92)). The growth of interstitial amphibole caused much more interstitial liquid to be incorporated into the cumulates than might be expected for dryer basaltic systems, producing a very imperfect fractional crystallization process. Comparisons of models of the trace-element evolution of the two intrusions reveal that the overall enrichments of some elements are adequately predicted by a perfect fractional crystallization model but all agree better with an imperfect fractional crystallization model. This reflects the change in the bulk distribution coefficients of the solid assemblage upon amphibole saturation, with the retention of elements compatible in amphibole in the crystal pile and the loss of elements incompatible in amphibole from it. These results stress the importance of understanding the physical, as well as the chemical processes involved in fractional crystallization and in particular the role of postcumulus processes.
机译：Rymmen和Eriksberg辉长岩保存含水玄武岩液体的结晶产物，范围从钙长石和滑石到高分度的氧化物辉长岩，闪闪石和白闪石。充满岩浆室的液体的初始水含量很高（1.5-3 wt％），即使在最早形成的堆积物中，闪石也可以作为间隙矿物饱和。系统中不断增加的水含量有助于产生带有浓密斜长石的厚堆积体序列（An_（87-92））。间隙闪石的生长导致将间隙液体掺入到颗粒中，这比干燥器玄武岩体系所预期的要多，从而产生了非常不完美的分级结晶过程。两次入侵的痕量元素演化模型的比较表明，完善的分级结晶模型可以充分预测某些元素的总富集，但与不完善的分级结晶模型比较吻合。这反映了在闪石饱和时固体组合物的体积分布系数的变化，其中保留了在晶体堆中与闪石相容的元素，并从其中丢失了与闪石不相容的元素。这些结果强调了解部分结晶所涉及的物理过程和化学过程的重要性，尤其是积云后过程的作用。

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