Metallogenic epoch of the Aoyoute copper deposit in Dong Ujimqin Banner, Inner Mongolia

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.