| 论570矿床稀土元素特征及地球化学演化 |
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| 引用本文：.1995.REE characteristics and geochemical evolution of the No.570 ore district[J].Mineral Deposits,14(1):35~43 |
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| 中文摘要:本文对570矿床新鲜岩石、蚀变岩石的稀土元素进行了地球化学研究。稀土元素特征表明．矿区基底花岗岩的成因类似华南改造型花岗岩，火山岩可能是基底变质深熔作用形成，次花岗斑岩与火山岩同源。在弱酸性-中性热液蚀变（赤铁矿化和水云母化）过程中，稀土元素的变化不大，仅表现为稀土总量有所增减；而碱性蚀变（碱交代和碳酸盐化）则一方面表现出稀土总量的变化，另一方面轻、重稀土的分馏程度也有变化。矿石中稀土总量，特别是重稀土含量普遍升高，这一特征可以作为铀成矿的指示标志。 |
| 中文关键词:稀土元素 地球化学演化 570矿床 |
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| REE characteristics and geochemical evolution of the No.570 ore district |
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| Abstract:The No. 570 0re deposit is a volcanic type uranium, silver and molybdenum deposit. In this paper, REE geochemical studies of this deposit have been made in such aspects as basement rocks, surrounding rocks, altered rocks and ores. The surrounding volcanic rocks are enriched in REE ( LREE= 407.7×10-6 ) and strongly depleted in Eu (δEu=0.05), and their REE patterns decline rightward. These characteristics are quite simular to REE features of basement migmatite, suggesting that these Volcanic rocks might have been formed through the anatexis of basement rocks. The basement granite is characterized by enrichment of LREE, obvious fractionation between LREE and HREE ( LREE/HREE=7.51~9.97) and evident depletion of Eu (δEu=0.45~0.47 ), rather similar to REE characteristics of the transformation type uraniferous biotite granites in South China. This implies that the basement granite is probably a product of crustal remelting and trarsformation. In alkaline alteration (carbonation and alkali metasomatism), there is enrichment or depletion of REE, whereas in hydromicatization and red alteration, REE are relatively stable. The total REE content of ore, especially the HREE content, is apparently higher than barren rocks. The precipitation and enrichment of uranium are accompanied by the enrichment of EREE, especially HREE. Such behaviors of REE might indicate uranium mineralization. |
| keywords:rare earth elements, geochemical evolution, No. 570 ore deposit |
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