松辽盆地北部姚家组底部不整合面的发育特征及形成机制初探  

A preliminary study on characters and mechanism of the unconformity of Yaojia Formation's bottom surface in the northern Songliao Basin

作　　者：侯艳平[1,2] 朱德丰[2] 任延广[2] 任建业[1] 解习农[1] 庄新国[1] 

机构地区：[1]中国地质大学资源学院,武汉430074 [2]大庆油田有限责任公司勘探开发研究院,黑龙江大庆163712

出　　处：《地质科学》2009年第2期777-786,共10页Chinese Journal of Geology(Scientia Geologica Sinica)

基　　金：国家自然科学基金项目(批准号:40672089);国家重点基础研究发展计划(编号:2009CB219308)资助

摘　　要：松辽盆地北部姚家组底部的不整合面(T_(1-1)界面)为区域性不整合面,这一不整合面标志的隆升事件不仅控制了地层分布和层序划分,而且把盆地的坳陷阶段分为湖侵特征各不相同的两个亚阶段。姚一段的剥蚀区主要见于松辽盆地的东部和北部,反映造成这一隆升的挤压应力场来自其东南,与东亚大陆边缘移置地体的拼贴有关。松辽盆地是一个与燕山造山作用耦合发育的内陆盆地,坳陷(裂后热沉降)阶段的盆地发育受制于两个造山作用:西侧大兴安岭的热隆升和其东的东亚大陆边缘的地体拼贴引起的斜向汇聚—剪切造山作用。Based on seismic profiles, drilling data, sedimentary records and sequence＇s division, the paper thought the bottom surface of Member 1 ,Yaojia Formation being a regional unconformity in the northern Songliao Basin. The rising movement before deposition of Yaojia Formation not only controlled sediment＇s distribution and sequence＇s division,but also divided the depressional stage of the Songliao basin into two sub-stages, in each sub-stage the lacustrine transgrassion had vavied features. The eastern and northern areas of the basin were uplifted and eroded during sedimentary period of Member 1, Yaojia Formation, which comprehended the compressional stress field from the southeast, related to accretion of allochthonous terrains in the East Asian continental margin. The development of Songliao Basin might couple with the Yanshanian orogeny. In the depressional stage,it was constrained by upwelling of the Da Xinggan Ling to the west,and also coupled with the shearing orogeny in the East Asian continent marginal area. The latter resulted in closure of the Songliao Basin by the end of Cretaceous.

关 键 词：不整合面 姚家组一段 “盆”“山”耦合 晚白垩世 松辽盆地北部 

分 类 号：P542[天文地球—构造地质学]