| 解鸿斌,王新宇,袁金福,周闯.广西北山铅锌矿床地质特征及找矿方向[J].矿产勘查,2023,14(11):2059-2074 |
| 广西北山铅锌矿床地质特征及找矿方向 |
| Geological characteristics and prospecting direction of Beishan Pb-Zn deposit， Guangxi Province |
| 投稿时间：2022-06-09 修订日期：2022-10-09 |
| DOI：10.20008/j.kckc.202311005 |
| 中文关键词: 地质特征 找矿方向 北山铅锌矿床 广西 |
| 英文关键词: geological characteristics prospecting direction Beishan Pb-Zn deposit Guangxi Province |
| 基金项目:本文受广西关键矿产资源深部勘查人才小高地项目（桂组通字〔2019〕85号）资助。 |
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| 中文摘要: |
| 广西北山铅锌矿床位于雪峰—四堡古岛弧之罗城—环江坳陷内，是南岭地区重要的铅锌矿床。硫化物EPMA研究显示，北山铅锌矿床闪锌矿Zn平均含量为65.40%，S平均含量为32.36%，Zn和S相对与理论值都亏损。闪锌矿中Mn、Fe、Ga、Ge和In含量表明北山闪锌矿形成于低温条件下，且该组元素组成具有MVT矿床特征，Fe含量对应温度为100～200℃。方铅矿中Pb平均含量为85.32%，S平均值为13.15%，据明显的Pb、S亏损特征。部分方铅矿中Zn含量较高，表明方铅矿在结晶沉淀时仍有闪锌矿参与。黄铁矿中Fe含量平均值为45.93%，S平均含量为52.94%，Fe和S都具有明显亏损特征，表明黄铁矿中Fe受到Co、Ni的替换，而S可能受到As的替换。黄铁矿Co/Ni比值远小于1，表明北山黄铁矿为沉积型黄铁矿。结合硫化物EPMA研究结果和地质特征表明，广西北山铅锌矿为MVT型铅锌矿床。矿体主要产于断裂构造两侧褶皱核部虚脱部位和层间破碎带中，受北北东向褶皱、断裂、东岗岭组白云岩与桂林组泥灰岩界面联合控制，断裂、褶皱、岩性界面、TEM和激电异常为该区主要找矿标志。结合矿床成矿规律及找矿标志，提出了3处找矿靶区。 |
| 英文摘要: |
| The Beishan Pb-Zn deposit located in Luocheng-Huanjiang depression within Xufeng-Sibao ancient arc， is a important Pb-Zn depoist in South China. Electron probe study of sulfide show that the average content of Zn of sphalerite in the Beishan Pb-Zn deposit is 65.40% and the average content of S is 32.36%， with both Zn and S deficient relative to theoretical values. The Mn， Fe， Ga， Ge and In contents of the sphalerite indicate that the Beishan sphalerite was formed under low temperature conditions and that the elemental composition of this group is characteristic of MVT deposits， with Fe contents corresponding to temperatures of 100-200°C. The average Pb content in galena is 85.32% and the average S content is 13.15%， according to the obvious Pb and S deficit characteristics. The high Zn content in some galena indicates that galena is still involved in sphalerite when indicating galena in crystallization and precipitation. The average Fe content in pyrite is 45.93% and the average S content is 52.94%. Both Fe and S have obvious deficient characteristics， indicating that Fe received replacement by Co and Ni in pyrite， while S may have been replaced by As. The Co/Ni ratio of pyrite is much less than 1， indicating that Beishan pyrite is sedimentary pyrite. Combined with the results of sulfide EPMA study and geological features， it indicates that Beishan Pb-Zn deposit in Guangxi is MVT deposit. Orebodies of Beishan deposit are controlled by the NNE trending folds and faults， the interface of dolostone of Dongganglin Formation and argillaceous limestone of Guling Formation. Fault， fold， lithologic interface， TEM anomalies and IP anommalies are the primary prospceting criteria for Beishan deposit. Combined with the mineralization law of the deposit and the mineralization sign， three mineralization target areas were proposed. |
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