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首页> 外文期刊>Contributions to Mineralogy and Petrology >The trace element geochemistry of clinopyroxenes from pyroxenites in the Lewisian of NW Scotland: insights into light rare earth element mobility during granulite facies metamorphism
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The trace element geochemistry of clinopyroxenes from pyroxenites in the Lewisian of NW Scotland: insights into light rare earth element mobility during granulite facies metamorphism

机译：苏格兰西北路易斯维斯山脉辉石岩中辉石岩的痕量元素地球化学：粒岩相变质过程中轻稀土元素迁移的见解

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摘要

Clinopyroxenes from layered pyroxenites and from pyroxenite pods in felsic gneisses of the Lewisian granulite complex, NW Scotland, have distinctive chemistries suggestive of different origins. Clinopyroxenes in the layered pyroxenites crystallised from mafic melts in a magma chamber located in the middle to shallow crust, whereas clinopyroxenes in pods in the felsic gneisses crystallised from the tonalitic protolith to the felsic gneisses. In detail clinopyroxenes in the layered pyroxenites are variably enriched in the light REE, Inversion modelling shows that this is not a primary feature inherited from their parent magmas. Rather selective light rare earth element enrichment took place through reaction with a felsic melt generated by the localised partial melting of the hornblende pyroxenites during granulite facies metamorphism. Published isotopic evidence suggests that the light REE mobilisation took place at ca 2.7 Ga, about 200 Ma after the time of crust formation. This observation provides an explanation for the scattered pattern of whole-rock isochron ages from the Lewsian granulites.
机译：来自层状辉石岩的辉石和来自西北路易斯维斯粒状杂岩体长英质片麻岩中辉石岩荚的辉石具有独特的化学特征，暗示了不同的起源。从镁铁矿中结晶的层状辉石岩中的斜辉石在位于中地壳至浅地壳的岩浆室中结晶，而长英质片麻岩的豆荚中的斜辉石则从tonalitic原生岩到长英质片麻岩结晶。详细地说，层状辉石岩中的次生辉石在轻质稀土元素中含量可变，反演模型表明这不是其母岩浆遗传的主要特征。选择性的轻稀土元素富集是通过与粒状相变质过程中角闪石辉绿岩的局部部分熔融产生的长英质熔体反应而发生的。已发表的同位素证据表明，轻质稀土元素的动员发生在结壳形成后约200 Ma的2.7 Ga处。该观察结果为从Lewsian粒岩的全岩石等时年龄的分散模式提供了解释。

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