| 白云鄂博“白云岩”地质地球化学特征及成因讨论 |
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| 引用本文： | 刘铁庚,张正伟,叶霖,沈能平,杨占峰,李称心,冯建荣.白云鄂博“白云岩”地质地球化学特征及成因讨论[J].地质学报,2012,86(5):723-734. |
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| 作者姓名： | 刘铁庚 张正伟 叶霖 沈能平 杨占峰 李称心 冯建荣 |
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| 作者单位： | 中国科学院地球化学研究所矿床地球化学国家重点实验室，贵阳，550002;中国科学院地球化学研究所矿床地球化学国家重点实验室，贵阳，550002;中国科学院地球化学研究所矿床地球化学国家重点实验室，贵阳，550002;中国科学院地球化学研究所矿床地球化学国家重点实验室，贵阳，550002;内蒙古包头包钢集团巴润矿业有限责任公司，内蒙古包头，014080;内蒙古包头包钢集团巴润矿业有限责任公司，内蒙古包头，014080;内蒙古包头包钢集团巴润矿业有限责任公司，内蒙古包头，014080 |
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| 基金项目： | 本文为国家自然科学基金项目（编号41173063）资助的成果 |
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| 摘 要： | 白云鄂博"白云岩"位于华北板块的北缘,宽沟背斜的南翼。蕴藏着世界最大的稀土矿床,还是大型—超大型铌、铁和钍等矿床赋存母岩。"白云岩"不是层状岩石,无明显的层理和固定的层位,而是一套大小不等,串珠状的"白云岩"带。"白云岩"与围岩呈明显的侵入关系。表现在"白云岩"切割H4石英砂岩、H5板岩和花岗岩脉,并有许多分枝脉插入到H4石英砂岩和H5板岩中。"白云岩"中存在H4石英砂岩的残留顶盖相,捕获了H4石英砂岩和H5板岩的捕掳体,并引起围岩的强烈蚀变。板岩的黑云化,石英砂岩的钠闪石化,花岗岩的碱交代。"白云岩"含有大量铌、稀土、钍等岩浆岩中常见的矿物晶体。硫、碳、氧、锶和铁等同位素组成都具有深源特征。说明白云鄂博"白云岩"不是沉积岩,而是岩浆碳酸岩。
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| 关 键 词： | 白云鄂博“白云岩” 稀土矿床 地质地球化学特征 岩浆碳酸岩 |
| 收稿时间： | 2011/9/14 0:00:00 |
| 修稿时间： | 2011/12/29 0:00:00 |
Geological and Geochemical Characteristics and Genesis of “Dolomite” at Bayan Obo,China |
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| LIU Tiegeng,ZHANG Zhengwei,YE Lin,SHAN Nengping,YANG Zhanfeng,LI Chengxin and FENG Jianrong.Geological and Geochemical Characteristics and Genesis of “Dolomite” at Bayan Obo,China[J].Acta Geologica Sinica,2012,86(5):723-734. |
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| Authors: | LIU Tiegeng ZHANG Zhengwei YE Lin SHAN Nengping YANG Zhanfeng LI Chengxin and FENG Jianrong |
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| Institution: | 1) State Key Laboratory of Ore Deposit Geochemistry,Institute of Geochemistry,Chinese Academy of Sciences,Guiyang,550002;2) Baotou Steel(Group) Barun Mining Co.,Ltd,Baotou,Inner Mongolia,014080 |
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| Abstract: | Bayan Obo "dolomite" is distributed mainly at the south wing of the Kuangou anticline in the northern margin of the North China Craton.It is not only host to world’s largest rare earth deposit but also parental rock for the large or very large niobium,iron,scandium and other minerals.The "dolomite" is not layered rock due to lacking no obvious bedding and fixed sequence,but a beded dolomite belt with varying sizes.The "dolomite" has the obvious relationship of invasion with surrounding rock,which is reflected by the "dolomite" cutting through quartz sandstone(H4),slate(H5),and granite,and by many dolomite veins intruding the quartz sandstone(H4) and slate(H5).Residual cover phase of quartz sandstone(H4) occurs in the "dolomite".Meanwhile xenoliths of quartz sandstone and slate were also found in the dolomite,along with strong alteration of country rocks.Biotitization of slate,riebeckitization of quartz sandstone,and alkaline metasomatism are very common in the mining area.The "dolomite" contains a large amount of mineral crystals such as niobium,rare earths,thorium,etc.,which are common in igneous rocks.The sulfur,carbon,oxygen,strontium and iron isotope composition have deep-source characteristics.All the features indicate that the dolomite is magmatic carbonate but not sedimentary carbonate. |
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| Keywords: | Baiyun Obo "dolomite" geological and geochemical characteristics carbonatite magma |
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