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首页> 外文期刊>Contributions to Mineralogy and Petrology >Preservation of primary mineral inclusions and secondary mineralization in igneous zircon: a case study in orthogneiss from the Blue Ridge, Virginia
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Preservation of primary mineral inclusions and secondary mineralization in igneous zircon: a case study in orthogneiss from the Blue Ridge, Virginia

机译：锆石火成岩中主要矿物包裹体的保存和次要矿化作用：以弗吉尼亚州蓝脊的正片麻岩为例

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摘要

A wide variety of minerals occur as inclusions in igneous zircon and can provide valuable evidence of source magma composition from originally magmatic zircons in metamorphic and clastic sedimentary rocks. However, it is not clear the extent to which zircons preserve the primary composition of their inclusions through a variety of geologic processes. This paper documents a case study of inclusion-rich, originally igneous zircon from an orthogneiss in the Blue Ridge of southwest Virginia. Zircon inclusions isolated from cracks contain 4 % clearly metamorphic phases (mainly in hosts with disturbed U-Pb systems) and otherwise retain distinct plagioclase chemistry, K-feldspar/plagioclase pairs, and biotite with much wider-ranging Mg/(Mg + Fe) than biotite in the rock matrix. A clearly secondary mineralization suite filling cracks in the zircons consists of quartz, biotite, albite, and epidote. Overall, these zircons preserve mineral inclusions distinct from their current host rock (except when exposed to external environments via cracks), demonstrating that non-metamict zircons may preserve their primary inclusion assemblages through later amphibolite to lower granulite facies metamorphism.
机译：多种矿物以火成锆石的夹杂物形式存在，可以为变质和碎屑沉积岩中原始岩浆锆石的源岩浆成分提供有价值的证据。但是，尚不清楚锆石通过各种地质过程在多大程度上保留了其包裹体的主要成分。本文记录了一个案例研究，该案例来自弗吉尼亚西南部蓝脊正生片岩中富含夹杂物，原为火成岩的锆石。从裂缝中分离出的锆石夹杂物含有4％明显的变质相（主要存在于受U-Pb系统干扰的宿主中），否则保留了独特的斜长石化学，钾长石/斜长石对以及黑云母，其Mg /（Mg + Fe）范围更广比岩石基质中的黑云母明显的次生矿化套件充填了锆石中的裂缝，其中包括石英，黑云母，钠长石和埃迪奥蒂。总体而言，这些锆石保存的矿物夹杂物不同于当前的宿主岩石（除非通过裂缝暴露于外部环境中），这表明非准分子锆石可能通过后来的闪石到较低的花岗石相变质作用来保存其主要包裹体组​​合。

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