二连盆地胜利煤田构造特征及成因机制

Structural characteristics and genetic mechanism of Shengli coalfield in Erlian basin

为研究二连盆地胜利煤田构造及成因问题,以野外地质调查及煤田地质资料分析为基础,结合前人研究成果,分析研究区构造及其演化。结果表明:早白垩世以来,位于西伯利亚板块与欧亚板块缝合带之上的胜利煤田在早期基底断裂的基础上,受东部太平洋板块向欧亚板块俯冲的影响,主要经历了伸展断陷、压扭变形和抬升剥蚀三期次级构造运动,形成了NE向边界断层控制下的压扭成因的NW向高角度正断层与NE向帚状构造的组合;其构造演化主要分为3个阶段,分别为阿尔善期的缓慢裂陷阶段、腾格尔和都红木期加速裂陷–快速裂陷阶段、赛罕塔拉期进入缓慢裂陷–终止裂陷阶段,研究区在此基础上发育的聚煤盆地。

Based on the field geological survey and coalfield geological data of Shengli coalfield in Erlian basin,combining the previous research results,we analyzed the structure and evolution of the study area.The result shows:Since the Early Cretaceous,located on the suture zone between the Siberia plate and the Eurasian plate and based on the early basement fault,the Shengli coalfield was affected by the westward subduction of the Pacific plate,which experienced three stages of extensional fault depression,torsional deformation and uplift and denudation,forming the combination of NW directional high angle normal faults and NE directional broom structures.The tectonic evolution of Shengli coalfield is mainly divided into three stages,respectively the slow rifting stage of the Aershan Period,the strong rapid rifting stage of Tenggeer and Duhongmu Period,the slow rifting and termination rifting stage of Saihantala Period,therefore,Shengli coalfield is a coal accumulation basin developed on this basis.