山东威海文登汤村店子金及多金属矿床地质特征及找矿前景

Geological Characteristics and Prospecting Future of Gold and Polymetallic Deposit in Tangcundianzi in Wendeng City of Shandong Province

威海-文登成矿带为胶东东部地区重要金及多金属成矿带,文登汤村店子金及多金属矿床为该成矿带内典型矿床,其形成与分布受米山断裂及次级断裂的控制。米山断裂次级断裂近EW向断裂带内发现7条矿化蚀变带,且在蚀变带内圈定4个金及多金属共生矿体,分别为Ⅰ-1,Ⅰ-2,Ⅱ-1,Ⅲ-1,其中Ⅱ-1矿体规模最大,赋存于Ⅱ矿化蚀变带中,呈细脉状,倾向NNE,倾角60°±,走向400 m,斜深250 m,赋存标高+60 m^-180 m,并共生银及铅、锌等多金属矿。矿石自然类型主要为原生矿石,地表为氧化矿石。矿体主要由多金属硫化物石英脉组成,围岩为中细粒二长花岗质片麻岩,围岩蚀变主要是绢英岩化、黄铁矿化等。通过对汤村店子金及多金属矿床地质特征及矿床成因分析,初步建立了成矿模式,进一步指出找矿方向及找矿标志,为后期找矿工作提供依据。

Wendeng Weihai metallogenic belt is an important gold and polymetallic metallogenic belt in easten Shandong province. Tangcundianzi gold and polymetallic deposit is a typical one. The formation and distribution ol ore deposit types is controlled by Mishan lault and its secondary laults . Seven mineralized alteration zones are lound in the fault zones with the trend ol nearly EW. Four gold and polymetallic intergrowth ore bodies have been delinea-ted. They are I 1 ,I 2 ,H 1 and W 1. No. II 1 ore body is the biggest one. It was lound in No. H alteration zone with the type ol thin quartz veins. Its dip is about 6 0 °with the trend ol NNE. The gold ore body is 400m long along the strike,and 250m long in the inclination direction. The occurrence elevation is ＋ 60m？180m,accompa-nying with silver, lead and zinc. Natural types ol ore bodies are mainly primary ore, while are oxidation ores on the surface. Ore bodies mainly consist ol polymetallic sullide quartz veins. The country rocks are medium line grained monzonitic granite gneiss. Gold mineralization is related with sericitization,pyritization and silication,etc. Through analysis on geological characteristics and the origin ol the deposit,the metallogenic model is established in this are- a,and prospecting direction and indicators have been given. It is expected that many other ore bodies will be lound in the luture.