佳木斯隆起与周缘盆地间边界断裂特征研究

在野外地质实测的基础上，结合前人研究成果，发现佳木斯隆起与周缘盆地间边界断裂以近东西向与近北西向为主，近东西向断裂由一系列的逆冲断层组成，如兴农-裴德断裂、三江盆地南部边界断裂等，逆冲方向由南向北; 近北西向断裂以勃( 利) --依( 兰) 断裂为主。根据逆冲推覆构造的空间展布、构造样式、组合关系和碎屑锆石裂变径迹测年结果分析，佳木斯隆起与周缘盆地间边界断裂的形成时间为早白垩世( 东山组) 之后。初步认为早白垩世时期该区受NW--SE 向伸展作用，佳木斯周缘统一盆地形成，晚白垩世时期来自NWW--SEE 向挤压作用对佳木斯隆起及周缘盆地间边缘断裂产生了逆冲叠加

Jiamusi Uplift and the boundary fractures of characteristics of surrounding basins

On the basis of field geologic surveying and previous data，we find the boundary faults of Jiamusi Uplift with its surrounding basins extended mainly in the directions of near EW and near NW，in which the faults in near EW direction formed by a series of thrusts nappe，e． g． the Xingnong-peide fault，the southern margined fault of the Sanjiang Basin，etc． Its thrust direction is from the south to the north; the north--west faults are mainly represented by the Boli--yilan fault． Based on the thrust nappes distribution，structural style，composite relations and detrital zircon fission track dating result analysis，we find that Jiamusi Uplift and surrounding faults formed after the Early Cretaceous ( Dongshan Formation) ． The studied area impacted by the NW--SW extension，formed the comprhensive basins in the Early Cretaceous． During Late Cretaceous in the studied area，the NWW-SEE compressions thrusted and superimposed on the Jiamusi Uplift and its surrounding faults．