辽西北票(金-羊)盆地中生代砂岩碎屑组分对区域构造演化的响应

根据北票 (金-羊 )盆地中生界砂岩碎屑组分分析,综合区域构造演化背景、盆地沉积充填序列及砾岩特征,对盆地中生代物源及构造演化进行了示踪 :晚三叠世为盆地构造活化的起始阶段,盆地物源应主要来自周缘隆升蚀源区的前中生代碎屑沉积物;早侏罗世辽西地区发生了明显的差异升降,北票 (金-羊 )盆地相对伸展陷落,盆地范围有所扩大;晚侏罗世北西-南东向逆冲推覆作用成为盆地的主要控制因素,北票 (金-羊 )盆地具有明显前陆盆地特征,盆地西缘太古代变质岩系出露剥蚀而成为盆地的主要物源之一;早白垩世辽西地区发生构造反转,北票 (金-羊 )盆地相对萎缩。Dickinson模型并不完全适用于辽西地区。

Detrital Composition of Mesozoic Sandstone and Its Implication for Provenance and Tectonic Evolution of Beipiao(Jin-Yang) Basin , Western Liaoning Province

According to the research on detrital composition of Mesozoic sandstone, it is p roposed that the detrital maturity of the sandstone in Beipiao (Jin-yang) basin is low, and these sandstones contain abundant volcanic lithics,quartz and felds par. Combining basin tectonic setting and sedimentary sequence feature, it can b e deduced that the upper-Triassic sedimentary detritus was eroded from the upli fted regions around the basin. During early Jurassic, Liaoxi area experience d intensely tectonic activation, accompanied by inhomogeneous uplifting, an d Beipiao (Jin-yang) basin subsided and expanded. The Archean basement rocks might have become an important source of the upper Jurassic as a reault of the southeast-trending thrust faulting. In early Cretaceous, the tectonic setting of Liaoxi area changed from squeezing to stretching, and Beipiao (Jinyang) basin ceased evolution. It can also be seen that Dickinson QFL triangle diagram is n ot completely suitable to the western Liaoning province.