论东天山觉罗塔格造山带的大地构造属性

觉罗塔格造山带位于吐哈盆地和中天山地块之间，长期以来，关于该造山带的大地构造属性争论较多，有晚古生代岛弧带、弧后盆地、裂陷槽、古生代陆缘增生带、石炭纪火山岩型被动陆缘等不同认识。基于晚古生代早期觉罗塔格地区处于板内拉张的动力学背景，而非挤压碰撞环境，结合对带内早石炭世雅满苏组火山—沉积建造较为系统的岩石学、岩石化学及岩石地球化学研究，认为觉罗塔格造山带应为一拉张型构造—岩浆岩带。

Tectonic attribute of the Qoltag orogenic belt in the East Tianshan Mountains, northwestern China

The Joltag orogenic belt is located between the Turpan-Hami basin and Central Tianshan block, in the East Tianshan Mountains. For a long time different views exist as to the tectonic attribute of this orogenic belt, e.g. it is considered as a Late Paleozoic arc island belt, a backarc basin, an aulacogen, a Paleozoic continental-marginal accretion belt or Carboniferous volcanic-type passive continental margins. Based on systematic petrological, petrochemical and rock geochemical studies of the volcanic-sedimentary formations of the Early Carboniferous Yamasu Formation in the belt and the fact that the Qoltag area was in an intraplate extensional dynamic setting rather than a noncompresional collisional dynamic setting during the Early Paleozoic,the authors conclude that the Qoltag orogenic belt should be an extensional tectono-magmatic one.