内蒙古西山湾羊场银多金属矿区土壤元素富集特征及找矿预测
发布时间：2018-12-20 07:28
【摘要】：西山湾羊场银多金属矿床位于华北地台北缘狼山—渣尔泰山中—新元古代裂陷槽东段,区内构造较为发育,成矿地质条件良好。矿床赋存于下白垩统白女羊盘组(K1bn)酸性火山岩中,赋矿岩石主要为流纹岩、潜流纹斑岩及流纹质角砾岩,受岩浆活动及构造作用影响,岩(矿)石硅化、萤石化、黄铁矿化等矿化蚀变较为发育。矿区中Ag、Sb、W、Au元素富集程度较高,其中Sb、W元素的富集与Ag元素的富集关系较为密切,Mo、Pb、Bi、As的富集程度较低,Cu、Zn主要表现为元素的贫化。在Ⅰ区、Ⅱ区和Ⅳ区流纹岩、潜流纹斑岩及流纹质角砾岩的土壤中Ag、Sb、W、Au元素的富集程度与分异程度高,反映了原岩具有较好的成矿潜力。结合矿区以往的工作成果,本次在土壤测量的Ⅱ区和Ⅳ区进行异常的分析评价,开展找矿预测。采用逐步剔除法和分形含量—面积法分别计算单元素异常下限。通过比较分析认为,逐步剔除法计算的异常下限在矿区使用效果较好,因此以逐步剔除法确定的异常下限绘制单元素异常图,并进行异常的分析评价。使用相关性分析与因子分析确定元素共生组合,绘制因子得分异常图。Ⅱ区因子得分异常与单元素异常分布较为吻合,即沿马鬃山断裂的潜流纹斑岩呈北东方向延伸,是找矿的有利地段。Ⅳ区因子得分异常主要分布于采样区的北部,异常范围内主要出露流纹岩与流纹质角砾岩,因子得分异常较单元素异常分布相对集中,浓集中心更为突出,能够更好地指导找矿。结合矿区地质条件、地球化学元素富集特征及异常特征,在Ⅱ区和Ⅳ区各圈定了一处预测区。Y-1预测区在Ⅱ区内沿马鬃山断裂的潜流纹斑岩分布,受断裂构造影响,岩石较为破碎,局部有硅化、黄铁矿化等蚀变发育,成矿地质条件良好;预测区主要出露潜流纹斑岩,其土壤中Ag、Sb、W、Au元素的富集程度较高,且这些元素异常较为显著,找矿潜力较好。Y-2预测区位于Ⅳ区北部,走向为北东向,与酸性火山岩走向基本一致,受南北向张性—张扭性构造的影响,岩石多发生破碎,岩石中发育有硅化、褐铁矿化、萤石化等矿化蚀变,成矿地质条件较为良好;主要出露下白垩统白女羊盘组流纹岩和流纹质角砾岩,其土壤中Ag、Sb、W元素的富集程度高,预测区套合有Cu、Ag、Sb、W、Pb、Bi、Au等元素的异常,且异常较为显著,具有较好的找矿潜力。
[Abstract]:The Yangchang silver polymetallic deposit in Xishanwan is located in the eastern section of Langshan-Jar Taishan Middle-Neoproterozoic rift trough in the Taipei margin of the North China platform. The structure in the area is relatively developed and the ore-forming geological conditions are good. The deposit occurs in the acid volcanic rocks of the Lower Cretaceous Bainuiyangpan formation (K1bn). The ore-hosting rocks are mainly rhyolite, submersible porphyry and fluvial breccia, which are affected by magmatic activity and tectonism, silicification of rock (ore) and fluorinization. Pyrite mineralization and other mineralization alteration is more developed. The enrichment degree of Ag,Sb,W,Au element is relatively high in the mining area, in which the enrichment of Sb,W element is closely related to the enrichment of Ag element, and the enrichment degree of Mo,Pb,Bi,As element is relatively low, and Cu,Zn is mainly characterized by element dilution. The enrichment and differentiation of Ag,Sb,W,Au elements in the soils of rhyolite, submersible porphyry and fluid-grained breccia in areas 鈪，
本文编号：2387648
[Abstract]:The Yangchang silver polymetallic deposit in Xishanwan is located in the eastern section of Langshan-Jar Taishan Middle-Neoproterozoic rift trough in the Taipei margin of the North China platform. The structure in the area is relatively developed and the ore-forming geological conditions are good. The deposit occurs in the acid volcanic rocks of the Lower Cretaceous Bainuiyangpan formation (K1bn). The ore-hosting rocks are mainly rhyolite, submersible porphyry and fluvial breccia, which are affected by magmatic activity and tectonism, silicification of rock (ore) and fluorinization. Pyrite mineralization and other mineralization alteration is more developed. The enrichment degree of Ag,Sb,W,Au element is relatively high in the mining area, in which the enrichment of Sb,W element is closely related to the enrichment of Ag element, and the enrichment degree of Mo,Pb,Bi,As element is relatively low, and Cu,Zn is mainly characterized by element dilution. The enrichment and differentiation of Ag,Sb,W,Au elements in the soils of rhyolite, submersible porphyry and fluid-grained breccia in areas 鈪，
本文编号：2387648
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