内蒙古东乌旗奥尤特铜矿床的成矿时代

摘要

The Aoyoute copper deposit located in Dong Ujimqin Banner of eastern Inner Mongolia is one of the most typical depos⁃its along the Erlian- Dong Ujimqin Banner metallogenic belt. The deposit lies in a suite of Jurassic continental volcanic rocks and sub-volcanic rocks. The country rocks are mainly composed of volcanic breccia, conglomeratic ignimbrite, rhyolite and rhyolite por⁃phyry. Choosing the ore-bearing quartz vein which is closest to the mineralization in the deposit, the authors performed dating with the quartz 40Ar/39Ar method. The results show that the metallogenic epoch of the Aoyoute copper deposit is 187.11±3.50Ma.%奥尤特铜矿床位于内蒙古东部东乌旗地区，是二连-东乌旗成矿带最为典型的铜矿床之一，矿床赋存于侏罗纪一套陆相火山岩和次火山岩中，容矿岩石主要为火山角砾岩、含砾熔结凝灰岩、流纹岩及流纹斑岩。本文选取矿区出露的含矿石英脉，进行了石英40Ar/39Ar法同位素年龄测定，结果表明，奥尤特铜矿床的成矿时代为187.11±3.50Ma。