东昆仑造山带纳赤台群形成的大地构造环境探讨  

TECTONIC ENVIRONMENT OF NAIJ TAL GROUP IN THE EAST KUNLUN OROGENIC BELT

作　　者：倪晋宇[1] 胡道功[1] 周春景[1] 

机构地区：[1]中国地质科学院地质力学研究所,北京100081

出　　处：《地质力学学报》2010年第1期11-20,共10页Journal of Geomechanics

基　　金：中国地质调查局地质调查项目(1212010711510)资助

摘　　要：纳赤台群是东昆仑造山带重要的岩石地层单位,对恢复早古生代地质演化历史具有重要意义,但对其形成构造环境分歧较大。在野外详细地质填图的基础上,对东昆仑造山带奥陶—志留系纳赤台群碎屑岩进行地球化学分析,以探讨东昆仑早古生代构造环境,为东昆仑早古生代构造演化研究提供地球化学证据。研究结果表明,纳赤台群形成于被动大陆边缘,而非活动大陆边缘的弧前盆地沉积,该结果与前人根据地质分析得出的结论一致。The Naij Tal Group,an important stratigraphic unit,is of great significance to reconstruction of the geological evolution of the East Kunlun orogenic belt during the Early Paleozoic,but divergent opinions have been proposed about its tectonic environment.Based on close geological survey,a geochemical analysis has been made on the clastic rocks in the Ordovician-Silurian Naij Tal Group in East Kunlun orogenic belt,and the results demonstrate that this group was formed in passive continental margin,rather than in fore-arc basin on active continental margin.The study provides geochemical evidence for the study of early Paleozoic tectonic evolution in east Kunlun orogenic belt.

关 键 词：岩石地球化学 构造环境 纳赤台群 东昆仑造山带 

分 类 号：P595[天文地球—地球化学]