河南姚冲隐伏斑岩型钼矿床蚀变分带及成矿作用特征

Alteration zonation and metallogenesis of the Yaochong concealed porphyry molybdenum deposit,Henan Province

姚冲钼矿床产于大别成矿带西段,为斑岩型钼矿床。矿体主要赋存于花岗斑岩体(脉)外接触带(中元古界蚀变片麻岩)中,主要受隐伏岩体和构造控制。辉钼矿化主要类型为浸染状、细脉—网脉状、薄膜状和角砾状。矿床蚀变分带明显,由中心向外侧依次为钾长石化—硅化带(强蚀变带)、硅化—绢英岩化带(弱蚀变带)、硅化—青磐岩化带,由中心向外围蚀变强度逐渐降低,成矿作用减弱。

The Yaochong porphyry molybdenum deposit is located in the western part of Dahie metallogenie belt in the north slope of the Dabie Mountains. It is hosted in the genesis rocks nearby the outlier contact zone of the granoporphyry mass, and controlled jointly by the intrusive and structures. The molybdenum orebody occurs as disseminated,veinlet stocks, coating and brecciaed. There are apparent alteration zoning in the deposit area, i. e. , from central part to the country rock, the K - feldspar alteration to silieie alter- ation zone （ strong alteration zone）, to silicic - phyllic zone and silieic - propylitie zone. A trend of alteration and mineralization de- creasing outwards is also identified.