| 魏继祖,杜培笑,张晨,梁芳敏,闫晋龙,张勇,任明浩.河南石蹄沟萤石矿区地球化学勘探及找矿预测[J].矿产勘查,2019,(8):2047-2055 |
| 河南石蹄沟萤石矿区地球化学勘探及找矿预测 |
| Geochemical exploration and predicting of fluorite deposit in Shitigou area, Henan |
| 投稿时间：2019-01-11 |
| DOI： |
| 中文关键词: 地球化学勘探 萤石矿 元素异常 主成分分析 河南 |
| 英文关键词: geochemical prospecting,fluorite ore,element anomaly,principal component analysis,Henan |
| 基金项目:华北水利水电大学高层次人才资助项目(编号:20171003)和国家自然科学基金(编号:41402269,41501562)联合资助。 |
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| 中文摘要: |
| 河南省石蹄沟地区位于北秦岭构造带,地质调查资料显示该地区有多处铅、银及多金属矿点。然而,自90年代完成1∶5万成矿预测之后,该地区矿产勘查一直处于停滞状态。本次地球化学勘探研究发现,工作区内元素异常中心位于勘查区东南角,金、银、砷异常较为显著；氟异常分布面积广,但是异常值低,规模相对较小,其它元素均为散点异常,表明该地区可能存在金、银矿化,萤石成矿则可能为规模小、分布散的小矿床。研究区化探结果显示,该地区样品中Ag与Au、As、Pb具有较明显的正相关关系；Au与Pb具有最强的相关性,相关系数达到0.86；F与其他元素无明显的相关性,与其相关性最强的为Zn,相关系数为0.45。结合穿过异常中心的纵剖面数据分析,研究区元素按照相关性可分为两组:Au-Ag-Pb和Cu-F-Fe-Zn。主成分分析显示,两组元素之间分别具有较强相关性。但是计算得到特征值和各个特征值对应的累计贡献率显示,前2个特征值所对应的累计贡献率为49.28%,前3个特征值对应的累计贡献率也只有61.91%,远没有达到85%。这就是说如果提取前3个主成分,丢失的信息占原始信息的38.09%。这表明该地区元素之间并不是简单的线性关系,存在更为复杂的赋存状态。 |
| 英文摘要: |
| Shitigou region in Henan Province is located in the north Qinling tectonic belt. Geological survey data show that this region has many lead, silver and polymetallic ore occurrence. However, since 1990s after completion of 1∶50000 metallogenic prediction, mineral exploration in the region has been stopped. The geochemical exploration and research found that element anomaly center in workspace is at the southeast corner of survey area, silver and arsenic anomaly is significant while the fluorine anomaly’s scale is relative small. It shows that mineralization of gold and silver may exist and fluorite mineralization scale may be small. According to the analytical results of the samples, Au, Ag, As and Pb have a significant positive correlation. Au and Pb have the strongest correlation, with a correlation coefficient of 0.86. there is no obvious correlation between F and other elements, and the most relevant element with F is Zn with a correlation coefficient of 0.45. Combined with longitudinal data analysis through the anomaly center and the principal component analysis, elements in the study area can be divided into two groups:Au-Ag-Pb and Cu-F-Fe-Zn. But calculating the eigenvalue and corresponding cumulative contribution of each characteristic value, the cumulative contribution rate of the first two and three eigenvalues is 49.28% and 61.91%, respectively, which are far from 85%. This indicates that between the area elements it is not a simple linear relationship, and there will be a more complicated state of occurrence. |
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