浙西北银山银多金属矿床地质特征及成因  

Geological Characteristics and Genesis of the Yinshan Silver-Polymetallic Deposit, Northwest Zhejiang

作　　者：王成彬[1,2,3,4] 陈建国[1,2,3,4] 肖凡[1,2,3,4] 吴光明[5] 张珍玉[1,2] 

机构地区：[1]中国地质大学(武汉)资源学院,湖北武汉430074 [2]中国地质大学地质过程与矿产资源国家重点实验室,湖北武汉430074 [3]中国地质大学(武汉)地质调查院,湖北武汉430074 [4]国土资源部资源定量评价与信息工程重点实验室,湖北武汉430074 [5]浙江省第一地质大队,浙江杭州310016

出　　处：《地质与勘探》2013年第4期634-646,共13页Geology and Exploration

基　　金："十二五"国家支撑计划课题(2011BAB06B08-2);中国地调局项目(12120113089100;1212011120986)联合资助

摘　　要：浙西北银山银多金属矿赋存于震旦纪蓝田组之中;矿体呈层状、似层状产出,受褶皱和断层控制明显,在褶皱的转折段和倒转翼矿明显加厚。Fe/Ti-Al/(Al+Fe+Mn)、Co/Ni比值都显示银山银多金属矿具有热水沉积特征,结合野外矿脉穿插关系和矿石的结构构造特征,可将成矿期划分为:热水沉积期和后期低温热液改造期两个成矿期;成矿流体整体属于低盐度流体,显示出从低盐度往高盐度演化的趋势。本文研究初步认为,银山银多金属矿属于浅成低温热液矿床,前寒武纪热水沉积阶段是金属元素的富集沉积阶段,但并未形成有经济价值的矿体,后来的构造运动和岩体侵入使其富集成矿。The Yinshan silver polymetallie deposit of northwestern Zhejiang occurs in the Sinian Lantian Formation. Its orebodies display layered and bedded texture, and exhibit a significant tectonic control by folds and faults. The orebodies become thicker on the hinge zones and reversal limbs of the folds. Ratios of Fe/Ti-Al/（ Al ＋ Fe ＋ Mn） and Co/Ni indicate its hydrothermal characteristics. In combination with the ore vein traverse relationship and ore textures and structures, the mineralization process can be divided into hydrothermal deposition period and the late epithermal transformation period. The ore-forming fluids are low in salinity, which indicates its evolution trend from low salinity to high salinity. It is concluded that the Yinshan silver poly- metallic deposit is an epithermal hydrothermal one, and the Preeambrian era is the stage of the enrichment of ore-forming elements, but it did not form economically valuable ores. The late tectonic movements and rock mass intrusion spawned the enriched ores.

关 键 词：浙西北 银山 银多金属 矿床地球化学 矿床成因 

分 类 号：P611[天文地球—矿床学]