黑龙江徐家村金矿床石英流体包裹体Rb-Sr等时线年龄  

Rb-Sr ISOCHRON AGE OF FLUID INCLUSIONS IN THE QUARTZ OF XUJIACUN GOLD DEPOSIT,HEILONGJIANG PROVINCE

作　　者：田丙强 王升鹏 齐忠友 TIAN Bing-qiang;WANG Sheng-peng;QI Zhong-you(Heilongjiang Institute Regional Geological Survey,Harbin 150080,China;School of Earth Sciences,Chengdu University%f Technology,Chengdu 610059,China)

机构地区：[1]黑龙江省区域地质调查所,黑龙江哈尔滨150080 [2]成都理工大学地球科学学院,四川成都610059

出　　处：《地质与资源》2020年第2期113-119,141,共8页Geology and Resources

基　　金：黑龙江省国土资源厅项目“黑龙江省林口县徐家村金多金属矿普查”(KCZX-SDKC-2015021).

摘　　要：徐家村金矿床位于佳木斯地块西南部,矿体赋存于晚二叠世二长花岗岩中.通过对含金石英脉石英中的流体包裹体进行Rb-Sr同位素年龄及H、O同位素测定,获取成矿年龄,探讨成矿流体来源及其与赋矿花岗岩的成因联系.结果显示:石英流体包裹体Rb-Sr等时线年龄为229±8.6 Ma,比含矿岩体形成时代(254.2±0.95 Ma、230.44±0.54 Ma)稍晚或接近.石英中H、O同位素特征显示成矿流体应为晚二叠世花岗岩浆分异出的热液,后期有少量的大气降水的加入,暗示了含矿石英脉与赋矿花岗岩体具有密切的成因联系.综合认为,成岩成矿可能发生在同一地质事件中,即与古亚洲洋板块向佳蒙地块俯冲作用有关.The Xujiacun gold deposit is located in the southwest of Jiamusi block,with the orebody occurred in the Late Permian monzogranite.The metallogenic age is obtained and the ore-forming fluid source and its genetic relation with the host granite are discussed through the determination of Rb-Sr isotope age and H and 0 isotopes of fluid inclusions in the quartz of gold veins.The results show that the Rb-Sr isochron age is 229±8.6 Ma,slightly later or close to the formation time of ore-bearing rock mass(254.2±0.95 Ma,230.44±0.54 Ma).The H and 0 isotopic characteristics of quartz indicate that the ore-forming fluid was the hydrothermal solution differentiated from the Late Permian granitic magma,with a small amount of atmospheric precipitation added later,suggesting that there is a close genetic relation between the ore-bearing quartz vein and the host granite.From the above,it is believed that the diagenesis and mineralization may occur in the same geological event,both related to the subduction of Paleo-Asian 0cean Plate into the Jiamusi-Mongolia block.

关 键 词：流体包裹体 RB-SR等时线 H、O同位素 黑龙江省 

分 类 号：P618.51[天文地球—矿床学]