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首页> 外文期刊>Journal of South American earth sciences >Geochemical characteristics of the Bayan Obo giant REE-Nb-Fe deposit: Constraints on its genesis
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Geochemical characteristics of the Bayan Obo giant REE-Nb-Fe deposit: Constraints on its genesis

机译：巴彦鄂博巨型稀土-铌-铁矿床的地球化学特征：成因的限制

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摘要

Geochemical characteristics of different dolomites in the Bayan Obo giant REE-Nb-Fe deposit in Inner Mongolia have been studied. Intensively REE-mineralized dolomites (total REE over 800 ppm) show similar geochemical characteristics to associated carbonatite dykes, with Ba, Th, REE enrichments and Sr, Nb, Ti, Cu depletions, which is different from those of dolomites in the deposit with low REE contents (total REE less than 800 ppm). The low REE dolomites display some transitional characteristics between carbonatite dyke and sedimentary carbonate, with La depletion and Nb enrichment. This indicates that the genesis of the REE-mineralized dolomites might be related to both carbonatite magma and sedimentary carbonates. Sulfur isotope data indicates two sulfur sources, a mantle source (δ~(34)S c.a. 0‰) and seawater (δ~(34)S c.a. +25‰). It is proposed that mineralized dolomites in the Bayan Obo giant REE-Nb-Fe deposit are the product of sedimentary carbonate hydrothermally metasomatised by carbonatite magma and/or associated fluids. These dolomites formed the large-scale rare earth mineralization in the unique Bayan Obo REE-Nb-Fe deposit.
机译：研究了内蒙古巴彦鄂博巨型REE-Nb-Fe矿床不同白云岩的地球化学特征。密集的REE矿化白云岩（总REE超过800 ppm）显示出与相关碳酸盐岩脉相似的地球化学特征，其中Ba，Th，REE富集度和Sr，Nb，Ti，Cu贫化，这与低矿床中白云岩的贫化不同REE含量（总REE小于800 ppm）。低稀土白云岩表现出一定的过渡特征，碳酸盐岩脉与沉积碳酸盐之间具有一定的过渡特征，且La贫化，Nb富集。这表明稀土元素矿化白云岩的成因可能与岩浆岩浆和沉积碳酸盐有关。硫同位素数据表明有两个硫源，地幔源（δ〜（34）S c.a. 0‰）和海水（δ〜（34）S c.a. + 25‰）。有人认为，白云鄂博巨型REE-Nb-Fe矿床中的矿化白云岩是碳酸盐岩浆和/或伴生流体经水热交代的沉积碳酸盐的产物。这些白云岩在独特的巴彦鄂博REE-Nb-Fe矿床中形成了大规模的稀土矿化。

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