陕西镇安太白庙金矿床成矿地质特征

MINERALIZATION GEOLOGICAL FEATURES OF THE GOLD DEPOSIT IN THE TAIBAIMIAO AREA ZHEN'AN SHAANXI

太白庙小型岩金矿床位于南秦岭印支褶皱带，东川─云镇复向斜中部。矿体呈似层状、脉状、透镜状，赋存于星红铺组变泥钙质石英粉砂岩中，受层位、岩性和ＮＷＷ向次级断裂带的控制。矿化与黄铁矿化、硅化、绢云母化、绿泥石化关系密切。金主要以自然金矿物形式存在，或包裹或充填于黄铁矿、石英、铁方解石、绢云母晶隙及裂隙间。成矿物质主要来源于容矿地层，成矿热液属大气降水热液。成矿温度低，压力小。在矿床地质特征上，经初步研究认为属于岩浆变质低温热液石英脉型金矿床．经混汞、重选、氰化浸出及堆浸半工业试验，金回收率较高，且选矿工艺简单，工业利用可行。

The Taibaimiao small-scale rock-gold deposit lies on the Eastern Sichuang Yunzhensynclinoria in the Indo-China folding zone of the Southern Qinling. The rock-body is an analogous layer,a vein or a lens in shape, and has been buried in a metamorphic quartz siltstone bearing mud and calcium at the Hongxingpu group. It has been controlled by the stratum, lithology and secondary faulting zone along the orentation NWW. The mineralization is closely related with the pyritization, silicatization, sericitization and chloridization. The gold mainly ixists as a form of natural gold-minerals, and is wraped or permented in crystalline and fracture spaces. The mineralization matters are mainly from an ore -accumulated stratum. The mineralization hot-liquid is part of the atmospheric water liquid. The temperature of the mineralhation is low and its pressure is small. After a preliminary discussion it was thought that the gold deposit is a part of the metamorphic quartz vein of metamorphic hot-liquid from the magma. Through a semi-industrial test by mixing with mercury. selecting again, soaking out with cyanide and stacking-soaking, the recovery ratio of gold becomes higher, its ore dressing technique is simple, and its industrial unilization is feasible.