冀西北红土梁煤矿区下花园组“下段”的层位厘定

Horizon Redefinition of Xiahuayuan Formation “Lower Sector” in Hongtuliang Coalmine Area,Northwestern Hebei

通过对冀西北尚义盆地红土梁煤矿区勘查钻孔岩心分析及地表露头观察,发现该区含煤岩系原下花园组"下段"与中段之间并不是传统认为的连续沉积,二者之间有明显断层迹象。经岩性对比,杂色之下花园组"下段"与下花园组上覆的九龙山组一致,尤其是"下段"火山岩、泥岩砾石成分,在尚义盆地煤系基底,也就是下花园组沉积的物源区不存在相应岩性,明确排除了该段为下花园组早期沉积的可能性。综合各方面资料,可以说明下花园组"下段"应为九龙山组,是断层逆冲过程中夹在断层间的残片。

Through exploration borehole core analysis and surface outcrop survey in the Hongtuliang coalmine area, Shangyi Basin,northwestern Hebei have found that the coal-bearing strata Xiahuayuan Formation＂lower sector＂and middle sector is not originally considered continuous depositions, between them has obvious fault evidence. After lithologic correlation, variegated Xiahuayuan Formation＂lower sector＂is consistent with the overlying Jiulongshan Formation, especially, the＂lower sector＂volcanic rock, mudstone gravel composition, in Shangyi Basin coal measures basement, that is Xiahuayuan Formation deposit provenance, corresponding lithology inexistence. Thus expressly excludes possibility of the＂lower sector＂is Xiahuayuan Formation early deposition. Integrated information from various aspects can determine the＂lower sector＂should be belonged to Jiulongshan Formation, a kind of fragments sandwiched in fault during thrusting process.