胶东威海-文登成矿带成矿特征及找矿标志  

Mineralization Features and Prospecting Indicators of the Weihai-Wendeng Metallognic Belt in Jiaodong Peninsula

作　　者：李国华 房静 丁正江 纪攀 

机构地区：[1]山东省第三地质矿产勘查院,山东烟台264004

出　　处：《地质与勘探》2013年第5期890-896,共7页Geology and Exploration

摘　　要：胶东威海-文登成矿带是胶东东部地区一个重要成矿带,该成矿带内金及多金属矿床(点)分布众多,成矿条件优越。该带矿产以金为主,银、铅、铜、锌次之;矿点多,矿体规模小,主要赋存于南北向米山超壳断裂两侧的次级断裂中,以近南北走向为主,近东西向为次,产状陡直;矿体围岩多为荣成岩套,部分为玲珑超单元;矿石以多金属硫化物石英脉型居多,具硅化、绢英岩化、绿泥石化等蚀变特征。研究认为,中生代燕山晚期,受太平洋板块向欧亚板块俯冲碰撞的影响,胶东地区由南东-北西向压应力场向张性应力场转换,深源含矿流体伴随岩浆底侵活动上升,在温度、压力等达到适宜条件时,运移聚集于不同构造扩容带中富集成矿,米山断裂及其次级断裂分布区为主要找矿靶区。The Weihai-Wendeng metallogenie belt is an important mineralization zone in the easteru Jiaodong Peninsula, with good mineralization condi- tions, where many gold and polymetallic deposits （occurrences） are widely distributed. Its mineral resources are dominated by gold deposits, followed by silver, lead, copper and zinc deposits. There are substantial but small-scale ore bodies, occurring in the secondary＇ faults on either flank of the south- nnrth-trending Mishan fault that may extends downward through crust. These ore bodies are mainly NE-trending, next EW direction, with upright occur- rences. Most of the surrounding rocks are Rnngcheng suite intrusives, and the rest are Linglong super-unit intrusives. Most ores are of polymetallic- sulfid quarts vein type, amt alteration of silicification, sericitization and Chloritization can be observed. Study suggests that in the late Yanshanian of the Mesozo- it＇, affected by the subduction of Pacific plate below the Eurasian plate, the southeast-northwest compressive stress field was converted into a tensile stress fiehl; the mineral-bearing fluids ascemled with the underplating of magma, and migrated and assembled in dilation zones of different structures and under appropriate temperature anti pressure, resulting in ore enrichment and mineralization. Thus the Mishan fault and its seeond fractures should be the main prospecting targets.

关 键 词：威海-文登成矿带 矿床特征 成矿模式 找矿标志 

分 类 号：P618[天文地球—矿床学]