内蒙古小狐狸山钼多金属矿床成岩成矿年龄及其地质意义  

Rock-forming and Ore-forming Ages of Xiaohulishan Molybdenum-polymetallic Deposit in Inner Mongolia and Its Geological Significance

作　　者：杨帅师[1,2] 王守光[3] 沈存利 张梅[3] 张红霞 郑宝军[3] 贾玲珑[3] 庄云 周立军[6] 

机构地区：[1]中国地质大学地球科学与资源学院,北京100083 [2]内蒙古自治区地质勘查基金管理中心,内蒙古呼和浩特010020 [3]内蒙古自治区地质调查院,内蒙古呼和浩特010020 [4]内蒙古自治区有色地质勘查局,内蒙古呼和浩特010010 [5]内蒙古自治区第三地质矿产勘查开发院,内蒙古呼和浩特010010 [6]内蒙古自治区地质矿产勘查开发局,内蒙古呼和浩特010010

出　　处：《现代地质》2012年第2期261-268,共8页Geoscience

基　　金：科技部"十一五"国家科技支撑计划重大项目"北山-狼山地区铜;富铁;铅锌;多金属矿评价技术开发及应用研究"(2006BAB01A09);中国地质调查局地质矿产调查评价专项"覆盖区矿产综合预测"(1212011085471)

摘　　要：利用最新取得的内蒙古北山北带小狐狸山斑岩型钼多金属矿辉钼矿Re-Os同位素测年资料以及小狐狸山岩体锆石206Pb/238U表面年龄资料,结合前人研究成果,对该矿床的成岩、成矿年龄进行了分析研究。根据测试结果,认为该矿床成因类型为斑岩型,含矿岩体形成时间为(246.8±1.7)Ma,为早三叠世晚期,成矿时间为(220.0±2.2)Ma,为晚三叠世早期,两者反映了成岩→成矿活动的时间轨迹,代表了小狐狸山斑岩型钼多金属成矿系统成矿过程的时间域。The ore-forming age of Xiaohulishan molybdenum-polymetallic deposit in Beishan area,Inner Mongolia,has been studied in this paper based on the Re-Os isotopic age of molybdenite in ore and the 206Pb/238U age of zircon in the rock obtained recently.It is put forward that the genetic type of this ore deposit belongs to porphyry molybdenum deposit.The results show conclusions as the following: the ore-bearing rock was formed at(246.8 ± 1.7) Ma,which belonged to the Early Triassic;mineralization took place at the(220.8 ± 2.2) Ma,as in the mid-Triassic;the two ages reflect the time trajectory of the rock-formation→mineralization,which represents the time domain of mineralization process of porphyry molybdenum-polymetallic ore-forming system in the Xiaohulishan of Beishan area,Inner Mongolia.

关 键 词：小狐狸山 钼多金属矿 成矿年龄 成岩年龄 成矿系统 时间域 内蒙古 

分 类 号：P618.6[天文地球—矿床学]