河南省镇平县楸树湾铜钼矿床矿化特征及成因

Mineralizing characteristics and ore genesis of Qiushuwan Porphyry Cu-Mo Deposit in Zhenping County,Henan Province

楸树湾铜钼矿主要赋存于雁岭沟组中,其中以赋存于爆发角砾岩中的不规则透镜状矿体为主,矿化呈脉状、细脉状、网脉状发育,品位低,矿化不稳定,围岩蚀变发育,矿体受构造破坏作用而形态不规则,膨缩、尖灭现象明显;其次为赋存于"格子状"断裂格局中的矽卡岩型矿体,受构造控制作用明显,品位低,矿化较稳定,围岩蚀变发育。此外,矿床中赋存于花岗岩体/脉中的脉状、透镜状矿体及片岩型矿体,规模较小,品位较低,围岩蚀变较发育。根据对矿区构造、矿化富集规律及分布规律的研究,认为床北坡矿段以构造角砾岩型铜/钼矿化,南坡矿段则以变质岩型矿化为主,其中深部具有隐伏斑岩体的较大找矿潜力。

The Qiushuwan Cu-Mo Deposit has been discovered in Yanlinggou Formation.The main mineralization type of Qiushuwan Cu-Mo Deposit occurs as irregular lenticular ore bodies in explosion breccia,which characterized by vein ore,thin-vien ore and net-vein ore,low grade,instable mineralization and strong wall rock alteration.The explosion breccia type mineralizaiton has present the irregular morphology and expansion-shrinkage of ore body by the destructive effect of fault stucture.The secondary mineralization occurs in clathrate structural framework,which characterized by low grade,stable mineralization and strong wall rock alteration.In addition,the vein/lenticular orebody in granitic pluton and the schist-host ore has characterized by lower grade and strong wall rock alteration.According to the research of fracture structure,mineralization enrichment rule and the mineralization distribution law, we conclude that the tectonic breccia type mineralization are mainly distributed in Beipo ore-section,and the metamorphic type mineralization are mainly distributed in Nanpo ore-section.The middle-deep part of concealed prophyry bodies are the potential targets.