| 喷流沉积型多金属矿床中镍钼的赋存特征 |
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| 引用本文： | 刘琦,赵爱林,肖刚,岳明新.喷流沉积型多金属矿床中镍钼的赋存特征[J].岩矿测试,2013,32(1):70-77. |
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| 作者姓名： | 刘琦 赵爱林 肖刚 岳明新 |
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| 作者单位： | 沈阳地质矿产研究所, 辽宁 沈阳 110032;沈阳地质矿产研究所, 辽宁 沈阳 110032;沈阳地质矿产研究所, 辽宁 沈阳 110032;沈阳地质矿产研究所, 辽宁 沈阳 110032 |
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| 摘 要： | 喷流沉积型矿床是矿床地质学研究的前沿课题,查明矿石中重要组分(镍和钼)的赋存状态是该类矿床地质学研究的重要内容。湘黔地区天鹅山-黄家湾、大坪-大浒镍钼矿带是典型的海底喷流沉积矿床,本文采集该矿区的样品,应用化学和光谱定量分析、偏光显微镜和X射线衍射、扫描电镜、电子探针等大型现代仪器相结合的分析手段,研究了矿石中镍和钼的赋存状态。化学和光谱分析确定矿石中镍含量为3.76％,钼含量为4.99％;偏光显微镜下观察发现金属矿物零星分布,颗粒细小,结晶程度差,光学特征极不明显,晶体形貌特征难以观察,初步推断矿石矿物以胶状形式存在,但在光学显微镜下很难为这些矿物定名和描述;X射线衍射分析验证了偏光显微镜鉴定结果,印证了样品中存在很多非晶质矿物,仅有钨钼钙矿和镍黄铁矿两种矿物含有镍钼,且矿物含量很低(分别为0.4%和0.8%),对比化学分析结果,可推断样品还存在其他富含镍钼元素的矿物。进一步对富集镍钼元素的区域进行电子探针分析,最终确定了镍除了赋存于辉砷镍矿、方硫镍矿中,在胶状黄铁矿和磁黄铁矿边缘呈蠕虫状花边的镍黄铁矿中也有富集;钼主要赋存于碳硫钼矿中。矿石中的镍钼主要赋存于由胶态向结晶态过渡的金属矿物中,研究成果为该类矿床的矿石矿物学研究、选矿、冶炼及矿石综合利用提供重要的信息和依据。
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| 关 键 词： | 喷流沉积型多金属矿床 镍钼赋存状态 电子探针 线扫描分析 面扫描分析 |
| 收稿时间： | 2012/7/10 0:00:00 |
| 修稿时间： | 2012/8/16 0:00:00 |
The Occurrence Characteristics of Nickel and Molybdenum in Sedimentary Exhalative Polymetallic Deposit |
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| LIU Qi,ZHAO Ai-lin,XIAO Gang and YUE Ming-xin.The Occurrence Characteristics of Nickel and Molybdenum in Sedimentary Exhalative Polymetallic Deposit[J].Rock and Mineral Analysis,2013,32(1):70-77. |
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| Authors: | LIU Qi ZHAO Ai-lin XIAO Gang and YUE Ming-xin |
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| Institution: | Shenyang Institute of Geology and Mineral Resources, Shenyang 110032, China;Shenyang Institute of Geology and Mineral Resources, Shenyang 110032, China;Shenyang Institute of Geology and Mineral Resources, Shenyang 110032, China;Shenyang Institute of Geology and Mineral Resources, Shenyang 110032, China |
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| Abstract: | Exhalative sedimentary polymetallic deposit is an attractive subject in the study of mineral deposit geology. Ascertaining the occurrence state of main ore components (nickel, molybdenum) is the important study focus for this kind of mineral deposit. The Swan Hill-Huangjiawan and Daping-Dahu nickel molybdenum ore belts of Xiang-Qian area are typical submarine exhalative sedimentary deposits. In this article, an account of samples that were collected from the ore district, and analyzed using large modern instruments including those for chemical and spectral analysis, Optical Microscope and X-ray Diffraction, Scanning Electron Microscope and Electron Probe is given, to study the occurrence states of nickel and molybdenum in the ores. The content of nickel was 3.76%, and the content of molybdenum was 4.99% using chemical and spectral analysis. Observations were made of the metal minerals in the polished section, which were distributed sporadically and occurred as fine particles. Since there is weak crystalline degree, low reflectivity and unclear crystal morphology under the polarizing microscope, it was preliminary inferred that the ore mineral existed in colloidal form, but it is difficult to name and describe these ore minerals. The X-ray Diffraction analysis results for the samples supported the observation under the Polarizing Microscope, which confirmed that there were many amorphous minerals hosted in the analyzed samples. The nickel and molybdenum occurred mainly in the tungsten-powellite and pyrrhotite with low contents of 0.4% and 0.8%, respectively. Comparing with the results of chemical analysis, it is hinted that there are other minerals which enrich nickel and molybdenum. Further analysis by electron microprobe in the nickel molybdenum enriched area indicate that nickel not only occurs in gersdorffite and vaesite, but is also concentrated in the edge of colloidal pyrite and pyrrhotite within a worm-like lace. Molybdenum mainly occurred in the carbon sulphur molybdenum ore. The nickel and molybdenum mainly occurred in the transition ore minerals from colloidal to crystalline. The research results provided important information and the basis for the study of ore mineralogy, mineral processing, smelting and comprehensive utilization of the mineral ores for this kind of deposit. |
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| Keywords: | exhalative sedimentary polymetallic deposit nickel and molybdenum occurrence characteristics Electron Probe Microanalysis line scanning analysis map scanning analysis |
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