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地球学报  2010 

蒙古国博洛大型金矿区花岗岩SHRIMP锆石U-Pb测年及地质意义

DOI: 10.3975/cagsb.2010.03.06

Keywords: 花岗岩,SHRIMP锆石U-Pb测年,Sr-Nd同位素,博洛金矿床,蒙古国

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Abstract:

本文首次对博洛金矿床容矿围岩—博洛黑云母花岗岩进行锆石SHRIMPU-Pb年龄测定,获得两组年龄441.9±6.6Ma和452.2±3.9Ma,表明博洛花岗杂岩体应属于早古生代晚期岩浆活动的产物。其主量元素特征表现为高硅(SiO2=75.90?10?2~76.43?10?2)、富钾(K2O/Na2O=1.52~1.72)、富碱((K2O+Na2O)=8.03?10?2~8.22?10?2,碱度率AR=3.99~4.13)、低钙(CaO=0.77?10?2~0.97?10?2)、弱过铝质(A/CNK=1.02~1.05)的特点;稀土元素ΣREE=(160.56~91.28)×10?6,δEu=0.19~0.41,稀土元素分布型式为具有明显负铕异常“燕型”曲线。微量元素除P、Ti相对原始地幔略有亏损外,其它微量元素都表现出不同程度富集,蛛网图曲线总体为右倾的趋势。(87Sr/86Sr)i=0.70986~0.70891,说明其岩浆来源应主要是壳源,但受到幔源物质的混染;(143Nd/144Nd)i=0.512138~0.512115,平均0.512127,εNd(t)变化在+1.4~+1.2,平均+1.3,为正值,具有幔源的特点。这些特征表明博洛黑云母花岗岩为壳幔相互作用的产物,并有新生地幔物质加入,产于造山后环境。博洛金矿床的形成时代为早侏罗世,博洛花岗杂岩仅仅为金矿床的容矿围岩,为矿床提供容矿空间,与金矿床成因关系不密切。

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