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首页> 外文期刊>Chinese science bulletin >Barite in omphacite-hosted K-feldspar + quartz poly-crystalline aggregates from the Sulu eclogites and its implications
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Barite in omphacite-hosted K-feldspar + quartz poly-crystalline aggregates from the Sulu eclogites and its implications

机译：苏禄榴辉岩中辉石岩型钾长石+石英多晶聚集体中的重晶石及其影响

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摘要

K-feldspar + quartz polycrystalline aggregates were found as sub-millimeter-size inclusions with a pseudomorph after coesite (?) in omphacites from a number of Sulu eclogites. In these aggregates, round or subhedral barites occur as tiny inclusions in either K-feldspar or quartz. Energy dispersive spectroscopy (EDS) analyses show that these barites have (1) 33.86%—41.12% SO_3, 0%— 34.65% SrO, and 24.12%—63.55% BaO, (2) seemingly negative linear correlations between SrO and BaO, indicating that they are ideal solid solutions of barite (BaSO_4) and celestite (SrSO_4), and (3) highly variable Sr/Ba molar ratios ranging from 0 to 2.1. Presence of barites in the Sulu eclogites not only indicates oxidation of the subducting continental crust, but also very limited and restricted fluids presented during exhumation of the Sulu UHP eclogites.
机译：在许多苏禄榴辉岩的吞噬物中，发现了钾长石+石英多晶聚集体为亚毫米大小的夹杂物，其在石英岩（？）之后有假晶形。在这些骨料中，圆形或亚面体的重晶石以钾长石或石英中的微小夹杂物形式出现。能量色散光谱（EDS）分析表明，这些重晶石具有（1）33.86％–41.12％SO_3、0％– 34.65％SrO和24.12％–63.55％BaO，（2）SrO和BaO之间似乎呈负线性关系，表明它们是重晶石（BaSO_4）和天青石（SrSO_4）的理想固溶体，以及（3）高度可变的Sr / Ba摩尔比在0至2.1之间。苏鲁榴辉岩中重晶石的存在不仅表明俯冲大陆壳被氧化，而且在苏鲁超高压榴辉岩掘出过程中所呈现的流体非常有限。

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