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

Lawrence A. Taylor; Gregory A. Snyder; Randall Keller; David A. Remley; Mahesh Anand; Rene Wiesli; John Valley; Nikolai V. Sobolev

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

机译：A组榴辉岩和韦氏岩的成岩作用：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 LREEs 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 δ 18O (5.46–7.81) values, and the positive Eu 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 °C, in a time interval of 1,071–1,237 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大量的矿物和化学成分，分别来自A组和B组榴辉岩。 A组榴辉岩的主要元素含量在B组榴辉岩和橄榄岩之间表现出过渡特征。斜ino的Mg＃为0.86-0.94，石榴石的Mg＃为0.60-0.84。乌达奇纳亚金伯利岩管的奥布那真娜亚组A和经过充分研究的B组榴辉岩的LREE浓度存在差异。一般而言，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，金盏花的趋势已经逆转。较高的δ18 O（5.46-7.81）值，以及石榴石和斜辉石中的正Eu异常（Eu / Eu * 1.2-1.4）表明，海洋地壳成分参与了A组榴辉岩的形成。 A组榴辉岩形成的时间间隔为1,071–1,237 Ma，在21.0至37.6 kbar，以及711至923°C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|424-443|共20页
作者
Lawrence A. Taylor; Gregory A. Snyder; Randall Keller; David A. Remley; Mahesh Anand; Rene Wiesli; John Valley; Nikolai V. Sobolev;
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Planetary Geosciences Institute Department of Earth Planetary Sciences University of Tennessee;

Planetary Geosciences Institute Department of Earth Planetary Sciences University of Tennessee;

Planetary Geosciences Institute Department of Earth Planetary Sciences University of Tennessee;

Planetary Geosciences Institute Department of Earth Planetary Sciences University of Tennessee;

Planetary Geosciences Institute Department of Earth Planetary Sciences University of Tennessee;

Planetary Geosciences Institute Department of Earth Planetary Sciences University of Tennessee;

Department of Geology and Geophysics University of Wisconsin;

Institute of Mineralogy and Petrography Russian Academy of Science;

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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

机译：通过碳酸盐岩和硅酸盐熔体弥思，在Ne西伯利亚Craton中重新加工成人架：来自碳酸盐的证据，来自Obnazhennaya Kimberlite的Dunite-to-Websterite Xenolith套件
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。
4. Evidence for Archean ocean crust with low high field strength element signature from diamondiferous eclogite xenoliths [C] . Dorrit E. Jacob, Stephen F. Foley International symposium on deep structure and evolution of continents . 1999

机译：来自大型欧洲葡萄酒Xenogites的高原强度元素签名的Archean Ocean Crust的证据
5. The origin and evolution of eclogite xenoliths and associated diamonds from the Jericho kimberlite, northern Slave craton, Canada: an integrated petrological, geochemical and isotopic study. [D] . Smart, Kathleen Alexandra. 2011

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机译：氧化还原预处理深部克拉通岩石圈为金伯利岩成因–来自中央奴隶克拉通的证据
7. The Origin of Low-Mgo Eclogite Xenoliths from Obnazhennaya Kimberlite, Siberian Craton [O] . Jing Sun, Roberta Rudnick, Sergey Kostrovitsky, 2020

机译：低MgO Eclogite Xenoliths的起源来自Obnazhennaya Kimberlite，西伯利亚Craton
8. Cr Redox Record of fO2 Variation in Angrites. Evidence for Redox Conditions of Angrite Petrogenesis and Parent Body. [R] . Shearer, C. K., Bell, A. S., Burger, P. V., 2016

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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