MINERALIZATION ZONATION OF MASSIVE SULFIDE DEPOSIT IN THE CHENGMENSHAN OREFIELD, JIANGXI PROVINCE, CHINA
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摘要: 通过城门山矿田矿床地质、矿体走向及倾向上的厚度及品位变化情况总结其矿化特征，根据成矿温度及地球化学成矿条件研究该矿体矿化富集规律的控制因素，并从矿化特征方面佐证讨论该类矿床的成因及外围找矿方向。研究表明，矿体矿化沿水平及垂向上均具有分带特征，大致表现为沿热液中心向外为Mo、Cu、Zn、Pb、Ag、Au元素的分带，从地表向下为TFe、Au、Ag、Pb、Zn、Cu元素的分带。除此之外，矿化还具有差异特征，表现为走向上矿体两端发育的不一致性、倾向上的局部豆荚状发育特征。本次工作厘定的分带性及差异性分别佐证了矿床的热液成因与沉积成因，并预测外围具有较好的多金属找矿前景，且东段好于西段。Abstract: Chengmenshan ore field is located in the middle part of Middle-Lower Yangtze River Cu-Fe mineralization belt, China. It is a large comprehensive ore field with enriched in ore-forming elements of Cu, S, Pb, Zn, Mo, Au, Ag and Fe. The deposit is a trinity of massive sulfide-type, skarn-type and porphyry-type. Massive sulfide-type ore body is the largest one in the Chengmenshan ore field, and it accounted for 57% of total copper resources. Based on the investigation on geological characteristics, thickness and grade changes of ore body along the strike and tendency, it summarized the features of mineralization. It studied and discussed the controlling factors of mineralization enrichment about ore-forming temperature and geochemistry, genesis of mineral deposit, prospecting direction of the mine periphery. The mineralization of the orebody has zonality both horizontal and vertical direction. It roughly shows Mo, Cu, Zn, Pb, Ag, Au element mineralization zonality from hydrothermal center to outside, and TFe, Au, Ag, Pb, Zn, Cu element mineralization zonality from surface to down. In addition, the mineralization is different. It display inconformity both the ends of the orebody along the strike and leguminous shape along the tendency. In this paper, the zonality and difference mineralization identified the hydrothermal genesis and sedimentary origin respectively. It has preferable exploration prospect outside the orefield, especially the eastern periphery of mine.
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Key words:
- trinity /
- massive sulfide /
- mineralization zonality /
- geochemistry /
- Chengmenshan copper mine
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图 1 九瑞区域地质-构造-岩浆岩略图
1—第四系；2—第三系；3—泥盆系—三叠系；4—奥陶系—志留系；5—燕山期中酸性岩体；6—倾角背斜轴线；7—向斜轴线；8—北东东向压扭断裂；9—北东/北东东向扭性断裂；10—北北西向张扭性断裂；11—隐伏构造迹线；12—矿区
Figure 1. Sketch of geology-structure-magma in the Jiujiang-Ruichang area
图 2 控制的块状硫化物型矿体水平投影图
1-块状硫化物型矿体；2-勘探线及线号；3-城门山岩体范围；4-矿段分界线
Figure 2. Horizontal projection of regulated massive sulfide deposits
图 3 块状硫化物矿体水平投影品位等值线图
Figure 3. Massive sulfide deposits horizontal projection grade contour map
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