陕西韩城矿区燎原煤矿断裂特征露头分析

Analysis of Fault Outcrops in Liaoyuan Coalmine, Hancheng Mining Area

根据野外地质填图资料,对陕西韩城燎原煤矿地表出露的断层进行了重新划定,将先前作为逆断层的一部分白头山南坡一带判定为正断层,属于韩城断裂的同期次级断层。综合区域构造背景和野外实地观察资料,对燎原煤矿发育的各断层特征进行分析,结果表明韩城断裂形成于上新世;韩城断裂的次级断层形成于上新世及第四纪;禹门口-西垣沟逆断层形成于白垩纪。研究区构造演化总体可分为渭北隆起和汾谓地堑两个演化阶段。

Based on field geological mapping, has redefined faults outcropped in the Liaoyuan coalmine in Hancheng mining area,Shaanxi Province. The study has considered that the reverse fault around the south slope of Baitoushan hill previously determined should be a normal fault, a contemporaneous secondary fault of the Hancheng rupture. Based on integrated regional tectonic setting and field observation data carried out analysis for each fault features developed in Liaoyuan coalmine. The result has shown that Hancheng rupture had formed in Pliocene; its secondary faults formed from Pliocene to Quaternary; while the Yumenkou-Xiyuangou reverse fault in Cretaceous. The tectonic evolution in study area can be differentiated into Weibei uplift and Fenwei graben two evolutional stages as a whole.