R. Vassileva, Sylvina Georgieva, J. Cempírek, V. Grozdev, R. Škoda, Elitsa Stefanova
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引用次数: 0
摘要
拉基托沃镇附近的 "Suhata Reka "采石场出露了大型伟晶岩体。它们的主要矿物成分是钾长石（40%）、斜长石（30%）、石英（25%）和云母（≤ 5%），此外还有含（REE+Y）的原生和次生附属物。伟晶岩的原生矿物质包括锆石、独居石、氙石、稀少的磷灰石和相当数量的石榴石。厘米大小的天青石-菱锰矿晶体含有大量裂隙，这些裂隙承载着含次生（REE+Y）磷酸盐（氙石、绿泥石）和硅酸盐矿物（如 REE-橄榄石）。石榴石后期 REE 矿化的形成是由于其热液蚀变和次生相中 REE+Y 的重新分布。
Garnet (REE+Y)-bearing mineral association in pegmatite from the Chepino lithotectonic Unit, Western Rhodopes
Large pegmatite body/bodies are outcropping in the “Suhata Reka” quarry, near the town of Rakitovo. Their bulk mineral composition with dominant K-feldspar (40%), plagioclase (30%), quartz (25%) and mica (≤ 5%) is complemented by (REE+Y)-bearing association of primary and secondary accessories. Zircon, monazite, xenotime, scarce apatite and noticeable amount of garnet are among the pegmatite primary minerals. The cm-sized almandine-spessartine crystals contain numerous fractures which host secondary (REE+Y)-bearing phosphate (xenotime, cheralite) and silicate minerals (e.g. REE-epidote). Formation of the late-stage REE-mineralization in garnet is due to its hydrothermal alteration and redistribution of REE+Y in the secondary phases.
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