| 地史早期岩石中的铅锌演化--狼山-渣尔泰山中元古代铅锌成矿的物质基础 |
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| 引用本文： | 朱笑青,张乾,何玉良,祝朝辉.地史早期岩石中的铅锌演化--狼山-渣尔泰山中元古代铅锌成矿的物质基础[J].矿物学报,2005,25(4):325-333. |
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| 作者姓名： | 朱笑青 张乾 何玉良 祝朝辉 |
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| 作者单位： | 1. 中国科学院,地球化学研究所,矿床地球化学重点实验室,贵州,贵阳,550002
2. 中国科学院,地球化学研究所,矿床地球化学重点实验室,贵州,贵阳,550002;中国科学院,研究生院,北京,100039 |
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| 基金项目： | 中国科学院重要方向项目（No.KZCX3.SW-125）;国家攀登计划预选项目（N0.95.预-25）;国家自然科学基金面上项目（No.40172037） |
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| 摘 要： | 以中国内蒙古狼山一渣尔泰山中元古代SEDEX型铅．锌成矿带为例，研究了该区从太古代到中元古代地壳岩石的铅锌含量和变化关系以及与成矿的关系。研究发现，从早到晚，岩石SiO2和K2O含量升高，铅含量也与二者同步增加；FeO、MgO、CaO及Na20含量呈下降趋势，锌含量也同步降低。在太古代时，岩石的Zn／Pb比值一般〉8，中元古代时这一比值降低为2～4。矿石的Zn／Pb比值与基底岩石Zn／Pb比值具有很好的一致性。铅锌这种随时间的变化与中元古代铅的暴发性成矿及大规模铅锌共生矿床的形成是同步的，说明基底岩石中的铅和锌是该成矿带SEDEX矿床成矿的物质基础。
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| 关 键 词： | 地史早期 铅锌演化 铅锌成矿 中元古代 狼山—渣尔泰山 |
| 文章编号： | 1000-4734（2005）04-0325-09 |
| 收稿时间： | 2005-03-03 |
| 修稿时间： | 2005年3月3日 |
THE EVOLUTIONS OF LEAD AND ZINC IN THE ROCKS OF THE EARLY EARTH'S HISTORY--ORE-FORMING MATERIAL SOURCE OF THE PROTEROZOIC SEDEX TYPE Pb-Zn DEPOSITS FROM THE LANGSHAN-ZHAERTAISHAN DISTRICT IN INNER MONGOLIA, CHINA. |
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| ZHU Xiao-qing,ZHANG Qian,HE Yu-liang,ZHU Chao-hui.THE EVOLUTIONS OF LEAD AND ZINC IN THE ROCKS OF THE EARLY EARTH''''S HISTORY--ORE-FORMING MATERIAL SOURCE OF THE PROTEROZOIC SEDEX TYPE Pb-Zn DEPOSITS FROM THE LANGSHAN-ZHAERTAISHAN DISTRICT IN INNER MONGOLIA, CHINA.[J].Acta Mineralogica Sinica,2005,25(4):325-333. |
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| Authors: | ZHU Xiao-qing ZHANG Qian HE Yu-liang ZHU Chao-hui |
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| Institution: | 1. Key ;aboratory of Ore Deposit Geochemistry,Institute of Geochemistry,Chinese Academy of Sciences ,Guiyang 550002,China;2.Graduate School,Chinese Academy of Sciences,Beijing 100039, China |
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| Abstract: | As exemplified by the Proterozoic SEDEX-type Pb-Zn mineralizing zone of the Langshan-Zhaertaishan district in Inner Mongolia, this paper presents the Pb and Zn contents of the crustal rocks from Archaean to Middle Proterozoic in age and studies their variation and relationships with mineralization. The results show that the SiO2, K20 and Pb contents of the rocks increased, and the FeO, MgO, CaO, and zinc contents decreased gradually from early to late. Zn/Pb ratios in the Archaean rocks are larger than eight and those in the Middle Proterozoic rocks are 2 - 4. Zn/Pb ratios in ores from some SEDEX type Pb-Zn deposits in North China are consistent with those of the basement rocks of every deposit. The temporal variations of Pb and Zn are synchronous with the extensive mineralization of Pb and the formation of large-scale associated Pb-Zn deposits in the Middle Proterozoic. This indicates that the evolution of Pb and Zn in the basement rocks from early to late provided the ore-forming material for mineralization of the SEDEX-type Pb-Zn deposits in the Langshan-Zhacrtaishan district. |
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| Keywords: | early stage of the Earth's history evolution of Pb and Zn mineralization of Pb and Zn Middle Proterozoic Langshan-Zhaertaishan district Inner Mongolia |
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