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首页> 外文期刊>Contributions to Mineralogy and Petrology >Anatomy of a low temperature zircon outgrowth
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Anatomy of a low temperature zircon outgrowth

机译：低温锆石产物的解剖

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摘要

Outgrowths of zircon and xenotime are abundant on detrital zircon in a greenschist facies regional metamorphic slate from the Scottish Highlands. Back-scattered electron images reveal that ca. 3-μm wide zircon outgrowths are porous, inclusion-rich and contain fine-grained intergrowths with xenotime. Focused ion beam milling, transmission electron microscopy and low-voltage scanning transmission electron microscopy show that the outgrowth microstructure is complex, composed of mis-orientated nano-crystalline zircon and a poorly crystalline zircon–xenotime complex. Well-defined micron-sized xenotime is also present within the outgrowth. Micro-textures show that the outgrowth developed in a polyphase history during cooling and exhumation. Accommodation space for the outgrowth is probably generated by a combination of thermal decompaction and the migration of defects in adjacent quartz driven by the force of crystallisation. Zircon may be unique in its ability to record textural evidence of events during uplift and exhumation that are not recorded in major silicate phases. Keywords Zircon - Xenotime - Retrograde metamorphism - Outgrowths - Metamict - Permeability Communicated by J.L.R. Touret.
机译：在来自苏格兰高地的绿片岩相区域变质岩中，碎屑锆石上锆石和xenotime的产物丰富。背向散射电子图像揭示出约。 3微米宽的锆石产物是多孔的，富含夹杂物，并且含有与异种时间的细粒共生物。聚焦离子束铣削，透射电子显微镜和低压扫描透射电子显微镜显示，产物的微观结构很复杂，由取向不正确的纳米晶锆石和晶态差的锆石-异戊二烯复合物组成。产物中也存在定义明确的微米级异种时间。微观纹理表明，在冷却和发掘尸体的过程中，产物在多相历史中发展。热分解和结晶力共同驱使相邻石英中的缺陷迁移，从而形成了容纳产物的容纳空间。锆石可能具有独特的能力，可以记录隆起和发掘过程中未在主要硅酸盐相中记录的事件的组织证据。锆石-Xenotime-逆行变质-产物-变质-渗透性由J.L.R. Touret。

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