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首页> 外文期刊>Precambrian Research >Genesis of the Bayan Obo Fe-REE-Nb formation in Inner Mongolia, North China Craton: A perspective review
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Genesis of the Bayan Obo Fe-REE-Nb formation in Inner Mongolia, North China Craton: A perspective review

机译：北方内蒙古的Bayan Obo Fe-Ree-NB形成的成因：透视审查

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The Bayan Obo deposit in Inner Mongolia, North China Craton (NCC) is the largest rare-earth element (REE) resource in the world. Due to the complex element and mineral compositions and the activity of several geological events, the ore-forming mechanism is still controversial. Previous models are reviewed here to provide information for further investigation on the Bayan Obo deposit. In this study, we summarize all different types of Fe-REE-Nb mineralization using field observations and microscope work, in which we recognize 9 types of Fe-REE-Nb ores in the Bayan Obo ore district. By compiling and reevaluating a large number of published geochemical data, this paper provides solid evidence that the Sayan Obo deposit formed through interaction between sedimentary rocks and carbonatite magmatism. From the results of our review, it can be conjectured that the formation of iron ores was originated from sedimentation (Pt-1), whereas the formation of REE mineralized dolomite might be related to interaction and reaction between the carbonatite magmas and/or associated fluids with sedimentary carbonate rocks, with the REE-bearing carbonatite magmas having undergone intense fractionation enrichment process. The C-O-S-Fe-Mg isotopes indicate that the REE-Nb mineralization was derived from metasomatism (fenitic alteration) of sedimentary carbonate. A new model is proposed for this unique REE-Nb mineralization, which is related to the subduction of Siberian Craton beneath the North China Craton since Early Paleozoic period. We interpret that the Bayan Obo Fe-REE-Nb ore deposits and their massive barren host, H8 dolomite, were generated as a result of interaction of fluids expelled from a subcontinental litho spheric mantle (SCLM)-derived carbonatite magma with sedimentary carbonates. (C) 2016 Elsevier B.V. All rights reserved.
机译：北方中国蒙古（NCC）内蒙古的Bayan Obo存放是世界上最大的稀土元素（REE）资源。由于复杂的元素和矿物组合物和几种地质事件的活性，矿石形成机制仍然存在争议。此处审查了以前的型号，以提供进一步调查Bayan Obo押金的信息。在这项研究中，我们使用现场观测和显微镜工作总结了所有不同类型的Fe-REE-NB矿化，其中我们识别了Bayan Obo Ore区的9种类型的Fe-Ree-NB矿石。通过编制和重新评估大量发布的地球化学数据，本文提供了通过沉积岩和碳酸盐矿岩浆岩之间的相互作用形成的Sayan Obo沉积物。从我们的评论结果来看，可以劝导铁矿石的形成源自沉降（Pt-1），而Ree矿化白云石的形成可能与碳酸盐矿和/或相关流体之间的相互作用和反应有关用沉积碳酸盐岩石，含有戒备碳酸盐矿岩浆经过强烈的分馏富集过程。 C-O-S-Fe-Mg同位素表明REE-NB矿化来自沉积碳酸盐的偏索术（围堰）。提出了一种新的模型，为这一独特的REE-NB矿化，与古生代初期以来北中国克拉顿下方西伯利亚克拉顿的俯冲有关。我们解释了Bayan Obo Fe-Ree-Nb矿床及其大量贫瘠宿主H8白云石，而导致流体从亚冷岩球形幔（SCLM）的碳酸盐岩岩浆中排出的流体相互作用而产生。 （c）2016年Elsevier B.v.保留所有权利。

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