| 白云鄂博铌、稀土铁矿的成矿地质条件及矿床成因 |
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| 引用本文： | 潘启宇.白云鄂博铌、稀土铁矿的成矿地质条件及矿床成因[J].内蒙古地质,1997(1). |
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| 作者姓名： | 潘启宇 |
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| 作者单位： | 内蒙古地质矿产勘查开发局 |
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| 摘 要： | 白云鄂博矿区的铁矿和铌、稀土矿分属两个成矿期和两种不同的成因。铁矿是中元古界蓟县系哈拉霍疙特组内的层控受变质铁矿，赋存在宽沟南侧的层状白云岩中，该白云岩及铁矿层是在两条同生断裂所控槽状泻湖中沉积的。除白云岩外，宽沟南北两侧地层均可对比，同属白云鄂博群。铁矿层的原生矿物为以菱铁矿为主的FeCO3－MgCO3系列矿物，受后期侵入岩的热变质作用转变为磁铁矿及赤铁矿。铌、稀土成矿作用与脉状、瘤状碳酸岩有关。矿区已发现该类脉岩40余条，可分为白云石质及方解石质两类，以前者为主。两类碳酸岩的稀土元素特征均为轻稀土高度富集型，铕弱亏损到富集，其来源较深碳酸岩体沿断裂侵入造成强烈而广阔的碱交代蚀变带，以霓长石化为主，其强度与稀土矿化强度呈正相关关系。推测矿区在不大的深度内赋存有较大的隐伏碳酸岩侵入体。
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| 关 键 词： | 受变质铁矿 铌稀土矿 碱性碳酸岩 矿床成因 白云鄂博 |
Metallogenic Geological Conditions and Genesis of Bayunebo Iron-Niobium REE Deposit |
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| Pan Qiyu.Metallogenic Geological Conditions and Genesis of Bayunebo Iron-Niobium REE Deposit[J].Geology of Inner Mongolia,1997(1). |
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| Authors: | Pan Qiyu |
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| Institution: | Inner Mongolia bureau of geology and mineral exploration and development |
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| Abstract: | Baiyunebo mining of the iron and the niobium rare-earth deposits belong to two epochs of mineralization and different genesis. The iron deposit was formational control the metamorphosed iron mine of Halahuogete Formation of Jixian system(Middle Proterozoic Era). It is existed in strait form dolomites to the south of Kuangou fault,the dolomites and iron ores were deposited in the trough lagoon controlled by two contemporaneous faults.Except for dolomites,the strata lied to the south and north of Kuangou can be corrleated and belong to the lithostratigraphic sequences of Bayunebo Group. The primary minerals of iron deposit were a series of FeCO3-MgCO3 (siderite mainly),which were transformed into magnetite and hematite by late period thermometamrphism of the intrusives. The niobium rare earth mineralization was concerned with tumour carbonatite. Over 40 rock veins have been discovered in the mine,which can be classified as dolomite. The characteric of two kinds REE carbonatites is LREE highly enriched type and the europium was from low depletion to rich that they can be showed from very deep origin. The carbonatite along fault intruded and led to intense and wide alteration zone of alkali metasomatism (mainly aegirine -microcline),the intensity of alteration is positively correlated with that of rareearth mineralization. It is speculated that the larger concealed intrusive body of carbonatites may be not too very deep under the mine district. |
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| Keywords: | metamorphosed iron deposit niobium REE deposit alkalic carbonatite genesis of mineral deposit Bayunebo |
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