胶东下潘格庄金矿床金的赋存状态及控矿构造特征

Gold Occurrence and Characteristics of Ore Controlling Structuresin Xianpangezhuang Gold Deposit in Jiaodong Area

摘要:

胶东下潘格庄金矿床为破碎带蚀变岩型金矿，其形成与朱吴断裂的次级断裂——下夼断裂、下潘格庄断裂、上潘格断裂3条断裂带关系密切。下夼断裂带为区内主要断裂带，双山屯、棉花州、韩家夼等中小型矿床均赋存于该断裂带内。断裂围岩为二长花岗岩，蚀变带下盘见有钾化，蚀变带内见有钠长石化、绢云母化、黄铁矿化等蚀变，断裂面上见有灰色、深灰色断层泥，工程揭露断裂面沿走向较连续。下潘格庄金矿床矿物共生组合简单，矿石矿物以黄铁矿为主，次为磁铁矿，并含有少量的黄铜矿、方铅矿、闪锌矿等，矿石矿物含量大于7.00%，属高硫化物型；脉石矿物含量大于90%，主要为石英和绢云母，次为长石、方解石、绿泥石；其中黄铁矿和石英为主要载金矿物。金矿物为银金矿，以包体金和裂隙金为主赋存于其他矿物中，金颗粒以细粒金为主。矿石伴生矿物组合主要为银和硫，矿石属于易碎易选矿石。

Abstract:

The types of gold deposits in this area are altered rock types in fractured zones. The formation of gold deposits in this area has close relation with Xiakuang fault, Xiapangezhuang fault and Shangpangezhuang fault which are the secondary faults of Zhuwu fault. Small and medium size deposits, such as Shuangshantun deposit, Mianhuazhou deposit and Hanjiakuang deposit occurred in Xiakuang fault. They are major faults in this area. The fractured surrounding rock are monzogranites. There is potassium alteration in footwall of alteration zone. Albitization, sericitization and pyritization can be seen in the alteration zone. There are grey and deep grey fault gouge on the fracture surface, and engineering expose fracture surface is continuous along the strike.The material composition of Xiapangezhuang gold deposits is relatively simple, pyrite is the main metal mineral, magnetite is a minor mineral, and contains a small amount of chalcopyrite, galena, sphalerite and so on. Metal content is more than 7.00% and belongs to high sulfide type; Gangue mineral content is greater than 90%. Main minerals are quartz and sericite, minor minerals are feldspar, calcite, chlorite. Gold bearing minerals are mainly pyrite and quartz. Gold deposits are electrum, the inclusion gold and fissure gold mainly occur in other minerals. Gold particles are mainly fine grained gold, ore associated minerals mainly consist of silver and sulfur, and ores are fragile and freemilling ore.