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首页> 外文期刊>Contributions to Mineralogy and Petrology >Multi-stage metasomatism of diamondiferous eclogite xenoliths from the Udachnaya kimberlite pipe, Yakutia, Siberia
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Multi-stage metasomatism of diamondiferous eclogite xenoliths from the Udachnaya kimberlite pipe, Yakutia, Siberia

机译：来自西伯利亚雅库特Udachnaya金伯利岩管的含钻石榴辉岩异岩的多阶段交代作用

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摘要

The primary garnet (pyrope-almandine)-omphacite (Cpx 1, 6.5-7 wt percent Na_2O)-sulfide (Fe-Ni-Co mss) assemblage of the two diamondiferous eclogite xenoliths studied (U33/1 and UX/1) experienced two mantle metasomatic events. The metasomatic event I is recorded by the formation of platy phlogopite (approx 10 wt percent K_2O), prior to incorporation of the xenoliths in the kimberlite. The bulk of the metasomatic alteration, consisting of spongy-textured clinopyroxene (Cpx 2A, 1-3 wt percent Na_2O), coarser-grained cliopyroxene (Cpx 2B, 2-5 wt percent Na_2O), pargasitic amphibole (approx 0.8 wt percent K_2O; 3-3.5 wt percent Na_2O), kelyphite (Cpx 3, mostly <1 wt percent Na_2O; and zoned Mg-Fe-Al spinel), sodalite, calcite, K-feldspar, djerfisherite (K_(5.95)Na_(0.02)Fe_(18.72)Ni_(2.36)Co_(0.01)Cu_(4.08)S_(26)Cl) and a small amount of K-Ca-Fe-Mg glass, is ascribed to the metasomatic event II that occurred also in the upper mantle, but after the xenoliths were incorporated in the kimberlite. A pervasive chloritic alteration (mainly clinochlore + magnetite) that overprints earlier assemblages probably took place in the upper crustal environment. The diamonds are invariably associated with secondary clinopyroxene and chlorite, but the diamonds formed before the entrainment of the xenoliths in the Udachnaya kimberlite.
机译：两种研究的含钻石的榴辉岩异岩（U33 / 1和UX / 1）的主要石榴石（吡咯烷-天青石）（Cpx 1，6.5-7 wt％Na_2O）-硫化物（Fe-Ni-Co mss）组合经历了两次地幔交变事件。在将异种岩掺入金伯利岩之前，通过形成板状金云母（约10 wt％K_2O）记录了交代反应I。大部分的交代变质包括海绵状斜生辉石（Cpx 2A，1-3 wt％Na_2O），粗粒斜生辉石（Cpx 2B，2-5 wt％Na_2O），腹泻角闪石（约0.8 wt％K_2O; 3-3.5重量百分比的Na_2O），水钠钙榴石（Cpx 3，大多数<1重量百分比的Na_2O;和分区的Mg-Fe-Al尖晶石），方钠石，方解石，钾长石，硬锌矿（K_（5.95）Na_（0.02）Fe_（ 18.72）Ni_（2.36）Co_（0.01）Cu_（4.08）S_（26）Cl）和少量的K-Ca-Fe-Mg玻璃归因于也在上地幔中发生的交代事件II，但将异种岩合并到金伯利岩中之后。在上地壳环境中可能发生了普遍的绿化蚀变（主要是斜绿石+磁铁矿），覆盖了较早的组合。钻石总是与次要次生辉石和绿泥石有关，但是钻石是在Udachnaya金伯利岩中夹带异种岩之前形成的。

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