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首页> 外文期刊>Journal of Asian earth sciences >Geochemical signatures for eclogite protolith from the Maksyutov Complex, South Urals
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Geochemical signatures for eclogite protolith from the Maksyutov Complex, South Urals

机译：南乌拉尔州马克苏伊托夫综合体的榴辉岩原生岩的地球化学特征

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摘要

We conducted a geochemical study of eclogites (40 samples) from a boudin of the Lower Unit of the Maksyutov Complex in the South Urals in order to determine their protolith nature. The eclogites have major element compositions corresponding to quartz-bearing hypersthene basalts. Trace-element characteristics of the eclogites further suggest that they resemble enriched-type of tholeiites such as E-MORB. The compositional variation of eclogices was likely caused by fractional crystallization of parental melt under hypabyssal conditions, during its intrusion in thinned continental crust shortly before subduction. The high-pressure metamorphism has not affected significantly the major- and trace-element signatures of the protoliths. The compositions of co-existing minerals from the distinguished rock groups do not show significant distinctions. The considerable scatter of P-T estimates of metamorphic conditions does not depend on whole-rock composition. Therefore, the eclogitization was preceded by a chemical differentiation of an initial magmatic source, which is responsible for co-existence of rocks of variable composition in the same boudin. Dikes or sills of tholeiite basalts having geochemical characteristics of E-MORB could be the protoliths for the Maksyutov eclogites.
机译：我们进行了地球化学研究，从南乌拉尔州马克苏伊托夫综合体下部单元的一个布丁中的榴辉岩（40个样品）来确定其原生石性质。榴辉岩具有主要元素组成，其对应于含石英的超合成玄武岩。榴辉岩的痕量元素特征进一步表明它们类似于富铝红柱石，例如E-MORB。生态成分的变化很可能是由于母体熔体在低俯冲作用下的部分结晶所致，这是俯冲前不久其侵入稀薄的大陆壳的过程。高压变质作用并没有显着影响原石的主要和痕量元素特征。来自不同岩石群的共存矿物的组成没有明显区别。对变质条件的P-T估计值的显着分散不取决于整个岩石的组成。因此，在磁化作用之前，首先对初始岩浆源进行化学区分，这是造成同一boudin中具有可变成分的岩石共存的原因。具有E-MORB地球化学特征的菱锰矿玄武岩的堤坝或基岩可能是Maksyutov榴辉岩的原型。

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