陕西杨斜—丰北河地区金钨矿控脉(矿)断裂构造特征及演化与成矿关系分析

THE CHARACTERISTICS OF THE FRACTURE TECTONIC CONTROLLING VEINS (ORES) AND THE RELATIONSHIP BETWEEN THE TECTONIC EVOLUTION AND OREFORMING IN THE GOLD-WOLFRAM DEPOSIT IN THE YANGXIE-FENGBEIHE AREA IN SHAANXI

杨斜—丰北河地区金钨矿严格受断裂构造控制,控脉(矿)断裂分别表现为扭张性,扭性和压扭性特征,经历了多次动定转化。它们与区域性北东、北西西向断裂及深大断裂相互串接,共同组成区内控矿构造网络。进入印支成矿期,由于区域多应力场的转换叠加、岩浆活动,在区内出现对扭力隅方向的频繁交替变化,从而导致各级断裂力学性质的转化,是矿液形成、运移和成矿的决定因素。

The gold-wolfram deposit in the Yangxie-Fengbeihe area is strictly controlled by fracture tectonics.The fractures controlling the veins(ores) are characterized by tenso-shear,shear and compresso-shear properties, which changed many times from stabilization to movement.They are con- nected with the regional fractures and deep-seated fractures in NE and NWW trends,thus forming the tectonic network controlling the ores in the area.In the Indosinian ore-forming period,the transformation and super- position of the regional multiple stress fields,magmatic movement and fre- quent alternation of the torsional force couple directions resulted in the transformation of the mechanic properties of fractures with different gra- de,which was the decisive factor for the ore fluid formation,movement and ore deposition.