论东天山觉罗塔格造山带的大地构造属性  

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

作　　者：陈富文[1] 何国琦[2] 李华芹[1] 

机构地区：[1]中国地质调查局宜昌地质矿产研究所,湖北宜昌443003 [2]北京大学地质学系,北京100871

出　　处：《中国地质》2003年第4期361-366,共6页Geology in China

基　　金：国家重点基础研究发展规划项目(2001CB409810)资助。

摘　　要：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。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.

关 键 词：造山带 大地构造 构造属性 觉罗塔格 东天山 

分 类 号：P542.3[天文地球—构造地质学]