陕西马鞍桥金矿床成因探讨

马鞍桥金矿是南秦岭泥盆系铅锌金（银汞锑）多金属成矿带中具有代表性的大型金矿床。矿床产于上泥盆统桐峪寺组上部浅变质细碎屑岩系，层位稳定。矿床的地质地球化学特征表明，成矿物质主要来自前沿盆纪基底的地层和岩石，成矿溶液主要为盆地同生水与变质水及大气降水的混合流体。成矿经历了同生沉积、韧性剪切变质变形、矿质活化迁移聚集和构造－热液活动叠加富集的多期成矿过程。综合分析确定，该矿床属受韧－脆性剪切带控制、地下

THE GENETIC DISCUSSION OF MAANQIAO GOLD DEPOSIT

Maanqiao gold deposit is a representative large scale deposit in Pb Zn Au (Ag Hg Sb)metallogenic belt of Devonian system on the south of Qinling. The deposit is located in the upper epimetamorphic microclastic rock formation of Tongyusi group of late Devonian system. Its geochemical feature indicates that ore forming elements mainly comes from stratum and rock of pre Devonian period and ore forming solution is complex fluid of syngenetic water, metamorphic water and meteoric water. Mineralization goes through multiple phases of mineralization,including syngenetic sedimentation, deformation and metamorphism of the ductile shearing with the activation movement and loucentration of the ore forming element, movement of tectonic hydrothermal solution with the superimposed enrichment of the ore forming element. It is concluded that the deposit is a carlin type gold deposit, which is under the control of the ductile brittle shear zone and belongs to the genesis of underground thermal water.