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首页> 外文期刊>Contributions to Mineralogy and Petrology >Experimental petrology constraints on the recycling of mafic cumulate: a focus on Cr-spinel from the Rum Eastern Layered Intrusion, Scotland
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Experimental petrology constraints on the recycling of mafic cumulate: a focus on Cr-spinel from the Rum Eastern Layered Intrusion, Scotland

机译：岩石学实验对黑铁矿堆积物回收的限制：以苏格兰朗姆酒东部分层侵入岩中的Cr-尖晶石为重点

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Reactive liquid flow is a common process in layered intrusions and more generally in episodically refilled magma chambers. Interaction between newly injected melt and cumulates, or crystal mushes, perturbs the liquid line of descent of the melt and modifies mineral chemistry and texture. We present insights into the effects of assimilation of mafic cumulate rocks (gabbro, troctolite) by cogenetic Mgrich basalt liquid using one-atmosphere, controlled fO(2) phase equilibrium experiments on picritic parental liquid to the Rum layered intrusion, Scotland. For picrite-only experiments at fO(2) = QFM, Cr-spinel (Cr# = Cr/[Cr + Al + Fe3+] = 0.43; Fe# = Fe2+/[Mg + Fe2+] = 0.32) saturates at 1320 degrees C, olivine (Fo(88)) at similar to 1290 degrees C, plagioclase (An(77)) at 1200 degrees C, and clinopyroxene (Mg#: 0.81) at 1180 degrees C. In melting experiments on picrite + gabbro mixtures, plagioclase (1230 degrees C, An(80)) and clinopyroxene (1200 degrees C, Mg#: 0.85) saturation temperature and mode are increased significantly. Cr-spinel in these experiments has a distinctive, low Fe#. In melting experiments on picrite + troctolite mixtures, plagioclase (An(86)) saturates at 1240 degrees C and clinopyroxene (Mg#: 0.81) at 1170 degrees C. Al-rich spinel crystallizes at high temperature (> 1220 degrees C) and becomes more Cr-rich upon cooling, reaching the highest Cr# = 0.47 at 1180 degrees C (0.54 at QFM-1.2). The experimental results confirm that plagioclase and clinopyroxene stability plays a major role in determining the composition of coexisting spinel. Comparing our experimental results to the Rum Eastern Layered Intrusion, we propose a model for the precipitation of spinel from picrite-troctolite hybrid melt that is compatible with the observed olivine, plagioclase, and clinopyroxene chemistry.
机译：反应性液体流动是分层侵入体中的常见过程，更普遍的是在渐渐充满的岩浆室内。新注入的熔体与堆积物之间的相互作用或晶体糊状物，扰乱了熔体下降的液体线，并改变了矿物的化学性质和质地。我们提出了对共生的Mgrich玄武岩液体同化的镁铁质累积岩石（辉长岩，玄武岩）的影响的见解，该混合物使用一种大气，受控的fO（2）相平衡实验对苏格兰朗姆酒层状侵入体的苦味母体液体。对于在fO（2）= QFM时仅进行苦味药的实验，Cr-尖晶石（Cr＃= Cr / [Cr + Al + Fe3 +] = 0.43; Fe＃= Fe2 + / [Mg + Fe2 +] = 0.32）在1320摄氏度时饱和，类似于1290摄氏度的橄榄石（Fo（88）），1200摄氏度的斜长石（An（77））和1180摄氏度的斜辉石（Mg＃：0.81）。在苦味子和辉长岩混合物的熔融实验中，斜长石（1230摄氏度，An（80））和次氯环己烯（1200摄氏度，Mg＃：0.85）的饱和温度和众数显着提高。在这些实验中，Cr-尖晶石具有独特的低Fe＃。在苦味粉+滑石混合物的熔融实验中，斜长石（An（86））在1240摄氏度下饱和，斜cl（Mg＃：0.81）在1170摄氏度下饱和。富铝尖晶石在高温（> 1220摄氏度）下结晶并变成冷却后会富集更多的Cr，在1180摄氏度下达到最高Cr＃= 0.47（在QFM-1.2下为0.54）。实验结果证实斜长石和环吡咯烷的稳定性在确定共存尖晶石的组成中起主要作用。将我们的实验结果与朗姆酒的东部分层入侵进行比较，我们提出了一种模型，用于从for石-云母杂化熔体中沉淀出尖晶石，该模型与观察到的橄榄石，斜长石和斜辉石化学相容。

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