The Chronology of Tulasu-Yelimodun Volcanic Belt: Constraints on the Metallogenic Epoch of the Jiamante Gold Deposit, Western Tianshan Mountains of Xinjiang
新疆西天山吐拉苏—也里莫墩火山岩带年代学: 对加曼特金矿成矿时代的约束

The Tulasu-Yelimodun volcanic belt is a key component part of the Late Paleozoic tectonic-magmatic metallogenic belt in the northern part of western Tianshan Mountains and strictly controls the temporal and spatial distribution of gold deposits within the ore belt. Based on geological data available, the authors measured the section of Dahalajunshan Formation volcanic host rocks of the Jiamante gold deposit in Yelimodun area, and the result shows that the volcanic strata are closely related to mineralization. LA-ICP-MS dating of zircons separated from dacite (the host rock of the gold deposit) yields a concordant 206Pb/238U age of 354.0±1.3 Ma(MSWD=1.4), suggesting that volcanic host rocks were formed in the Early Carboniferous, and the metallogenic epoch of the Jiamante gold deposit is constrained between 354.0±1.3 Ma and the Visean period of the Early Carboniferous. Regional correlation shows that there exist extensive intermediate-acidic volcanic-volcaniclastic rocks. Meanwhile, due to tectonic controls, there are differences in eruption time between the eastern and the western Tulasu-Yelimodun volcanic belt.