黑龙江翠宏山铁钼多金属矿田两期钼成矿事件厘定

黑龙江省翠宏山铁钼多金属矿田属于小兴安岭-张广才岭铁多金属成矿带,发育铁、铅、锌、钼、钨等多金属大规模成矿作用.尤以钼矿化最具特色,出现矽卡岩-斑岩型钼钨矿化、斑岩型钼矿化和隐爆角砾岩型钼矿化等多种类型的钼矿化在单一矿田中并存的现象.但三种钼矿化类型的矿化特征和时空关系等缺乏系统梳理,钼成矿事件尚未清晰厘定.选取该矿田...

Two Epochs of Mo Mineralization in Cuihongshan Fe-Mo-Polymetallic Ore field,Heilongjiang Province

Cuihongshan Fe-Mo-polymetallic ore field in Heilongjiang Province belongs to the Lesser Xing′an RangeZhangguangcailing Fe-polymetallic metallogenic belt,and is characterized by the large-scale mineralization of Fe,Pb,Zn,Mo and W.Among them,Mo mineralization is the most noticeable,with three mineralization styles,including skarn-porphyry Mo-W,porphyry Mo-only,and cryptoexplosion breccias Mo,coexisting in a single ore field.However,the mineralization characteristics and spatio-temporal relationship of the three Mo mineralization types have not been systematically analyzed,and the Mo mineralization events have not been clearly defined.In this paper,the Cuihongshan,Huojihe and Hongtieshan Mo(polymetallic)deposits were selected for the geological characteristics analyses.Combining the geological characteristics with molybdenite Re-Os dating,two Mo mineralization events in Cuihongshan ore field were defined,including the Late Triassic skarn-porphyry Mo-Wand cryptoexplosion Mo mineralization and the Early Jurassic porphyry Mo-only mineralization.The Re content of molybdenite and petrogenesis of ore-forming magma reveal that Mo in Cuihongshan ore field were derived from a mixed source containing mantlederived juvenile materials and ancient crustal components.And compared with the Late Triassic mineralization,more mantlederived juvenile materials were involved during the Early Jurassic mineralization.Based on the mineralization characteristics and ore-forming material source analysis,the Mo mineralization is suggested to be related to the collision process between Songnen block and Jiamusi block during Late Triassic to Early Jurassic.