胶东宋家沟金矿床的地质特征及矿床类型——胶东层控矿床的新发现

DISCOVERY OF A STRATA-BOUND DEPOSIT: GEOLOGY AND METALLOGENIC TYPE OF THE SONGJIAGOU GOLD DEPOSIT

胶东地区有 3种不同类型的金矿床 ,层控蚀变砾岩型金矿床是新发现的金矿类型 ,宋家沟金矿床是其代表。宋家沟金矿床赋存在胶莱盆地东北缘拆离断层带上盘的莱阳组砾岩中 ,为区内火山活动前期在大气水的参与下形成的蚀变砾岩型金矿床。初步的类比研究表明 ,宋家沟式金矿不同于传统意义上的砾岩型金矿 ,也不同于胶东地区的玲珑式和焦家式金矿床 ,具有明显的层控特征 ,与南非兰德金矿床具有一定的可比性 ,其找矿远景巨大。

There are three types of gold deposits in Jiaodong region, in which the strata-bound altered conglomerate gold deposit is a new type. It has been discovered on the northeastern margin of Jiaolai basin. The Songjiagou gold deposit is the representative one. It is hosted in a detached fault in the conglomerate of Early Cretaceous Laiyang Formation before Yanshanian volcanism, concerning with mixing of meteoric water and magmatic water. Comparative study shows that the Songjiagou gold deposit is different from not only the traditional conglomerate gold deposit, but also Jiaojia-type or Linglong-type gold deposit in Jiaodong Block. It is similar to the Witwatersland gold deposit in South Africa. This type of gold deposit has exploration potentiality in our country. WT6HZ]