天山北缘前陆冲断带形成时间的地层学证据  

STRATIGRAPHIC EVIDENCES FOR DATING OF THE FORELAND THRUST, NORTH TIANSHAN

作　　者：方世虎[1] 郭召杰[1] 张志诚[1] 吴朝东[1] 王美娜[1] 袁庆东[1] 张锐[1] 

机构地区：[1]北京大学造山带与地壳演化教育部重点实验室,北京100871

出　　处：《新疆地质》2004年第1期24-28,共5页Xinjiang Geology

基　　金：国家重点基础研究规划项目(2001CB409804)资助

摘　　要：乌鲁木齐附近天山北缘喀拉扎背斜及其周缘的地层学分析表明,上中新统—上新统昌吉河群(N1-2ch)(相当于独山子组N1-2d)是喀拉扎山地区发育的生长地层,是喀拉扎背斜形成时的同构造沉积层序.这个结论表明,包括喀拉扎背斜在内的天山北缘第一排前陆冲断构造带形成于晚中新—上新世时期.The Kalazha anticline is a structure of the first foreland fold-thrust belt in north Tianshan, near Urumuqi. Growth strata recorded accurately initial emplacement ages of structure and detailed forming processes. Stratigraphy analysis of Kalazha anticline and its adjacent area indicates that the Changjihe group(N1-2ch) is a set of growth strata. The Chanagjihe group (N1-2ch), which is belongs to Pliocene, is equivalent to Dushanzi formation (N1-2d) in sedimentation time. This conclusion proved that the first fold-thrust belt of north Tianshan, including the Kalazha anticline, initiated in late Miocene to the earliest Pliocene, and formed after that time.

关 键 词：地层学 沉积地层 前陆褶皱冲断带 喀拉扎背斜 

分 类 号：P539[天文地球—古生物学与地层学]