大兴安岭岔路口钼多金属矿床地质特征

Geological characteristics the Chalukou molybdenum polymetallic ore deposit,Daxing'anling

位于大兴安岭火山岩带北部,呼中-塔源多金属成矿带塔源南侧的岔路口钼多金属矿床,经过几年的地质评价已成为一大型斑岩型钼多金属矿床。成矿元素以钼为主,共伴生铅锌银。钼矿体总体呈拉长穹窿状,主体隐伏,在垂向上总体分为三种类型:上部层状工业矿体、中部较厚大工业矿体、底部富厚工业矿体,赋存在早白垩世流纹质凝灰熔岩、流纹质隐爆角砾岩及花岗斑岩内,受火山穹丘构造控制,具典型的斑岩型矿床蚀变特征,蚀变类型主要有硅化、钾化、绢云母化、高岭土化、绿泥石化、绿帘石化、碳酸岩化、萤石化等。矿区内河东区工作程度较高,已进入详查,河西区工作程度较低。矿区具有较大的成矿潜力,有望达到超大型规模。

The Chalukou molybdenum polymetallic ore deposit is located on south side of Tayuan in Huzhong- Tayuan polymetallic ore-forming zone, north of the Daxingranling volcanic belt, becoming a large scale por- phyry type molybdenum polymetallic ore deposit after several years＂ geological evaluation. The ore-forming elements are maily molybdenum associated with lead, zinc and silver. In general, molybdenum orebody occurs in extended dome with most part concealed and can be classified into three types vertically stratiform economic orebody on the top; relatively thicker and larger economic orebody in the central and richer and thicker economic orebody at the bottom, all occur in Early Cretaceous rhyolite lava, rhyolite cryptoexplosion breccia and granitic porphyry and controlled by volcanic dome structure and characterized by typical alteration of porphyry type deposit, the alteration types being silicification, potassic alteration, sericitization, choritiza- tion, epidotization, carbonation, fluoritization, etc. Hedong district in the mine has been much explored having entered in a detailed exploration stage while Hexi district is less studied. There is a relatively great potential for ore prospecting and is expected to become a super large scale deposit.