新疆西准噶尔额敏前陆盆地的构造特征及其演化  

Tectonics and Evolution of the E Min Foreland Basin in West Junggar, Xinjiang

作　　者：李永军[1,2] 王祚鹏 段丰浩 孙勇[1] 王军年[3] 万阈[3] 张胜龙[1] 

机构地区：[1]长安大学地球科学与资源学院,陕西西安710054 [2]国土资源部岩浆作用成矿与找矿重点实验室,陕西西安710054 [3]新疆地质矿产勘查开发局第七地质大队,新疆乌苏833000

出　　处：《大地构造与成矿学》2016年第3期419-428,共10页Geotectonica et Metallogenia

基　　金：国家自然科学基金项目(41273033;41303027);中央高校基金项目(310827153407);中国地质调查局地质矿产调查评价专项(1212011120516;121201120619)联合资助

摘　　要：西准噶尔吾尔喀什尔山与额敏盆地间的"盆"–"山"耦合关系清楚,盆地边界平行于造山带呈狭长带状展布。"山"区为志留系–石炭系海相陆源碎屑岩-火山岩沉积组合,"盆"区为二叠系陆相磨拉石与新近系红色砂砾岩及第四系河流阶地堆积,具有典型的海相-陆相双层结构。盆缘被巴尔雷克前陆冲断带围限,"山"区发育铲式逆冲断层与蛇头构造、叠瓦扇构造等逆冲推覆构造。表明该"盆"–"山"组合为一典型的前陆盆地系统。额敏前陆盆地形成于早二叠世,属后期冲断变形影响较弱、早期前陆盆地结构特征较明显的"早衰型"前陆盆地。这一成果为额敏盆地乃至西准噶尔盆地分析、构造演化、沉积作用、"盆"–"山"耦合等研究提供了重要信息。The relationship clearly show orogeny-coupled basin formation between Wuerkashier Mountain and E Min basin in West Junggar. The boundary of the basin is somewhat parallel to the orogenic belt. The sedimentary rocks in the ＂mountain＂ area include the Silurian-Carboniferous marine terrigenous clastic rocks and volcanic rocks, whereas in the ＂basin＂ area sedimentary rocks consist of the Permian continental molasse and Neogene red glutenite and accumulation of Quaternary river terraces, with a typical marine-continental double layered structure. The edge of the basin is limited by the Barleik foreland thrust belt. ＂Mountain＂ area develop such thrust nappe as shovel type thrust fault, snakeheads structure and imbricate fan structure. This indicates that the combination of ＂basin＂-＂mountain＂ is a typical foreland basin system. E Min foreland basin formed in the Early Permian, and belongs to the ＂Premature＂ foreland basin, which is characterized by weak impact of the later thrust deformation and obvious features of the early structure of foreland basin. This achievement provides important information for basin analysis, tectonic evolution, sedimentation and orogeny-coupled basin formation of the E Min basin as well as the West Junggar basin.

关 键 词：前陆盆地 “盆”–“山”耦合 海–陆相双层结构 巴尔雷克前陆冲断带 额敏 西准噶尔 

分 类 号：P542[天文地球—构造地质学]