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Trace elements distribution in metamorphic garnets from the Lapland Granulite belt

机译:拉普兰花岗石带变质石榴石中的微量元素分布

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Metamorphic garnets from the Lapland Granulite Belt (LGB) can be subdivided into 2 groups based on their REE distribution pattern. Garnets from mafic schists show a gentle slope from LREE to HREE enrichment and lack negative Eu-anomalies. Lower-Ca garnets from aluminous gneisses (acid granulites) are characterized by HREE enrichment and pronounced negative Eu-anomalies whose intensity tends to enhance with increase in SiO_2-content of the enclosing rocks. Lower temperatures of the granulite metamorphism within separate domains lead to higher HREE abundances in garnets. Different REE patterns in garnets from the Salnye Tundry schists are due to extremely high-magnesian garnets of presumably igneous origin. Pressure growth occurring during metamorphism seems to result in lower Sc-contents in the garnets.
机译:拉普兰花岗石带(LGB)的变质石榴石可根据其REE分布模式分为2组。镁铁质片岩的石榴石显示出从LREE到HREE富集的缓坡,并且没有负Eu异常。铝质片麻岩(酸性花岗石)中的低钙石榴石具有HREE富集和明显的负Eu异常特征,其强度趋于随围岩中SiO_2含量的增加而增强。在不同区域内较低的粒状变质温度导致石榴石中较高的HREE丰度。 Salnye Tundry片岩中石榴石的REE模式不同,这是由于推测其火成岩来源的镁含量极高的石榴石所致。在变质过程中发生的压力增长似乎导致石榴石中较低的Sc含量。

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