Petrogenesis of group A eclogites and websterites: evidence from the Obnazhennaya kimberlite, Yakutia

Lawrence A. Taylor; Gregory A. Snyder; Randall Keller

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Petrogenesis of group A eclogites and websterites: evidence from the Obnazhennaya kimberlite, Yakutia

机译：A组榴辉岩和Websterites的成岩作用：来自雅库特Obnazhennaya金伯利岩的证据

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Mantle xenoliths from the Obnazhennaya kimberlite pipe, Yakutia, possess a large range of mineralogical and chemical compositions, from both group A and B eclogites. Major-element contents of the group A eclogites exhibit transitional features between the group B eclogites and peridotite. The Mg# of clinopyroxenes is 0.86-0.94, with 0.60-0.84 for garnets. Differences in concentration of LReEEs exist between the Obnazhennaya group A and the well-studied group B eclogites from the Udachnaya kimberlite pipe. In general, garnets in the group A eclogites contain lower LREEs than those from the group B eclogites; however, the trend for clinopyroxene is reversed. High delta~18 O (5.46-7.81) values, and the positive Fu anomalies in the garnets and clinopyroxenes (Eu/Eu 1.2~1.4) demonstrate the involvement of an oceanic crustal component in the formation of the group A eclogites. The group A eclogites formed between 21.0 and 37.6 kbar, and 711 and 923 deg C, in a time interval of 1,07l-1,237 Ma. An innovative model is proposed to explain the formation of the group A eclogites and websterites. It involves the reaction of a depleted mantle peridotite with TTG and carbonatite melts closely related to the subduction of oceanic crust.

机译：来自雅库特Obnazhennaya金伯利岩管的地幔异岩具有广泛的矿物学和化学组成，分别来自A组和B组榴辉岩。 A族榴辉岩的主要元素含量在B族榴辉岩和橄榄岩之间表现出过渡特征。斜柏基的Mg＃为0.86-0.94，石榴石的Mg＃为0.60-0.84。乌纳奇纳亚金伯利岩管中的Obnazhennaya A组和经过精心研究的B组榴辉岩之间存在LReEEs浓度差异。通常，A组榴辉岩中的石榴石所含的LREE比B组榴辉岩中的石榴石低。但是，金碧辉煌的趋势已经逆转。高δ〜18 O（5.46-7.81）值，石榴石和斜向辉石的正Fu异常（Eu / Eu 1.2〜1.4）表明，A组榴辉岩的形成与海洋地壳成分有关。 A组榴辉岩形成的时间间隔为1,07l-1,237 Ma，在21.0至37.6 kbar，以及711至923摄氏度之间。提出了一种创新模型来解释A组榴辉岩和Websterite的形成。它涉及贫化的地幔橄榄岩与TTG的反应，而碳酸盐岩熔体与洋壳俯冲密切相关。

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《Contributions to Mineralogy and Petrology》 |2003年第4期|共20页
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Lawrence A. Taylor; Gregory A. Snyder; Randall Keller;
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1. Petrogenesis of group A eclogites and websterites: evidence from the Obnazhennaya kimberlite, Yakutia [J] . Lawrence A. Taylor, Gregory A. Snyder, Randall Keller Contributions to Mineralogy and Petrology . 2003,第4期

机译：A组榴辉岩和Websterites的成岩作用：来自雅库特Obnazhennaya金伯利岩的证据
2. Reworking of Archean mantle in the NE Siberian craton by carbonatite and silicate melt metasomatism: Evidence from a carbonate-bearing, dunite-to-websterite xenolith suite from the Obnazhennaya kimberlite [J] . Ionov Dmitri A., Doucet Luc S., Xu Yigang, Geochimica et Cosmochimica Acta: Journal of the Geochemical Society and the Meteoritical Society . 2018,第期

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3. Combined C isotope and geochemical evidence for a recycled origin for diamondiferous eclogite xenoliths from kimberlites of Yakutia [J] . Z.V. Spetsius, D.F. Wiggers de Vries, G.R. Davies Lithos: An International Journal of Mineralogy, Petrology, and Geochemistry . 2009,第Pta2Suppla期

机译：结合的C同位素和地球化学证据表明，雅库特金伯岩的含金榴辉榴辉岩异岩是可循环利用的。
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机译：角质层中fO2变化的Cr氧化还原记录。 angrite petrogenesis和parent Body的氧化还原条件的证据。

Petrogenesis of group A eclogites and websterites: evidence from the Obnazhennaya kimberlite, Yakutia

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