黑龙江翠宏山铁钼多金属矿田两期钼成矿事件厘定  

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

作　　者：曾国平 胡新露[3] 姚书振[3] 董子良 周铭 杨健[3] Zeng Guoping;Hu Xinlu;Yao Shuzhen;Dong Ziliang;Zhou Ming;Yang Jian(Wuhan Center of China Geological Survey,Wuhan 430205,China;Central South China Innovation Center for Geosciences,Wuhan 430205,China;School of Earth Resources,China University of Geosciences,Wuhan 430074,China;Chinese Academy of Geological Sciences,Beijing 100037,China)

机构地区：[1]中国地质调查局武汉地质调查中心,湖北武汉430205 [2]中南地质科技创新中心,湖北武汉430205 [3]中国地质大学资源学院,湖北武汉430074 [4]中国地质科学院,北京100037

出　　处：《地球科学》2022年第1期309-324,共16页Earth Science

基　　金：黑龙江省国土资源厅地勘基金项目(No.黑国土科研201601);中国地质调查局项目(No.DD20190443)。

摘　　要：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.选取该矿田内翠宏山、霍吉河和宏铁山等含钼矿床,开展矿床地质特征解析,结合辉钼矿Re-Os定年,初步厘定翠宏山矿田存在晚三叠世矽卡岩-斑岩型和隐爆角砾岩型钼矿化以及早侏罗世斑岩型钼矿化两期钼成矿事件.辉钼矿Re含量和成矿岩浆岩石学研究揭示翠宏山矿田中钼为幔源新生物质与古老地壳混源,相较于晚三叠世成矿期,早侏罗世成矿期加入了更多幔源新生物质.综合矿化特征和成矿物质来源分析认为区内钼成矿与松嫩地块与佳木斯地块在晚三叠世-早侏罗世期间的碰撞拼合过程有关.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.

关 键 词：翠宏山矿田 铁钼多金属 钼成矿事件 RE-OS定年 黑龙江省 矿床学 

分 类 号：P612[天文地球—矿床学]