华北陆块北缘中段金矿床类型分布和地质特征

The Distrubution of the Gold Deposit Type and Their Geological Characters in the Middle North Margin of North China Block

华北陆块北缘中段金矿床分布较多 ,产出较为集中 ,也是我国重要的黄金生产基地。本区是我国地质历史演化最久 ,又经历了多期、多阶段的构造 -岩浆活动的叠加 ,因而金矿床的形成具有多期性、多样性、继承性和新生性等特点。本区金矿床主要产在绿岩带构造 -岩浆活动的有利部位 ,统称绿岩带型金矿床 ,可分为同构造晚期初生型金矿床和构造期后再生型热液金矿床两类 ,又可细分为若干亚类 ,其中再生型热液金矿床分布较广 ,规模较大 ,具有较大找矿潜力。由于区内发育多期、多阶段的成矿构造 -岩浆活动 ,因而在一个金矿床密集区内 ,有时在不同的构造部位 ,分别产出初生型和再生型热液金矿床 。

Gold deposits widely distribute in the middle month margin of North China Block. This area is one of the most important basement of the Gold production. The basic rock here is mainly greenstone granite mostly from Archean with the multiple superimposition of many tectono magmatic events.so the formation of the gold deposits has the characters of the multiphase, diversity, inheritance and neoformation. The gold deposits formed in the tectono-magmatic favorable places in the greenstone belts and has the genetic relationship with the greenstone belts. The greenstone belt gold deposits in this region can be divided into two types. One is late syntectonic primary gold deposits, the other is post-tectonic regenerated hydrothermal gold deposits. The post-tectonic regenerated hydrothermal gold deposits are widely developed. The two types of the gold deposits can distribut in the same place for the minerglization of the multiple tecton magmatic activities.