山东沂南金矿铜井矿区矿液活动中心控矿特征

Ore-controlling Geological Characteristics of Ore-fluid Activity Center in Tongjing Mining Area of Yinan Gold Mine in Shangdong Province

沂南金矿铜井矿区的岩浆岩主要为侵入岩,严格受断裂构造控制。铜井闪长岩-闪长玢岩岩体为多期次侵位的复合岩体。分析了矿区及矿床地质特征,讨论了岩浆和矿液活动中心对矽卡岩型斑岩型金铜矿床的控矿作用,并对矿区可能存在的矿液活动中心位置进行了总结。研究表明:(1)矿区1个成矿岩体边缘或内部有数个矿液活动中心,矿体群受矿液活动中心控制,矿体多赋存于活动中心附近,远离活动中心矿体尖灭,矿体群消失;(2)矿区可能的矿液活动中心位置为岩体与围岩呈断层接触且有构造破碎带分布的位置,岩体边部拐角处有不同方向断层交汇地段,岩体中有"根"围岩捕掳体存在的地段,岩体边部构造形态特别复杂地段,较大岩枝边部继承性断裂复活地段等。

The magmatic rock in Tongjing Mining Area of Yinan Gold Mine is mainly for intrusive rock,it is strickly controlled by fault strctures. Diorite-diorite poqohyrite is the composite rock mass with muhistage subeemplacement in Tongjing Mining Area. The geological characteristics of the mining area and deposit are discussed, the ore-controlling effects of the magma and ore fluid activity center to skarn type Au-Cu deposit is analyzed,besides that, the locations of ore-fluid activity center in the mining area are summarized. The study results show that ：（1）several ore-fluid activity centers are distributed in the edge or interior of the metallogenic rock mass, the ore-body groups are controllled by ore-fluid activity centers, ore-bodies are mainly distributed around ore-fluid activity centers, if the ore-bodies away from ore-fluid activity centers, it will be disappeared and the ore-body groups are also be disappeared ;（2）ore-fluid activi- ty centers may be distributed at the area that the rock mass is in fault contact with its surrounding rock and structural fracture zone is distributed, the intersection of disdi-ctional faults in the comer of rock mass side,the area that the SmTounding rock xenolith with ＂ root＂ is existed in the rock mass,the area that the structural is praticularly complex in rock mass side and the inherited fracture resurrected area of the side of larger apophysis.