东胜煤田布尔台井田伸展构造几何学研究

Study on the geometry of extensional structure in the Burte well field

通过大量矿井地质构造观测和地表地质调研,对布尔台井田中侏罗世延安组内伸展构造发育和分布规律、构造样式、伸展断层组合形式进行了详细解析.研究结果表明,布尔台井田延安组中伸展断层有中小型高角度正断层和层滑断层两种类型,断层走向以NNE向为主,NW向次之.伸展断层形成于地壳上部构造层次脆性变形域,基本构造样式属盖层滑脱型,断层组合形式有小型地堑、地垒、台阶式断层、阶梯状断层.

Through a large amount of observation of mine geotectonic and many surveys of ground geology, analyzed the geometric characteristics of extensional tectonics in the Yan＇ an Formation of the Burte well field detailedly, including the development and distribution laws, structural styles and forms of combination. The results show that there are two types of extensional faults in the Yan＇ an Formation of the well field, they are minitype high angle downthrow faults and interlayer gliding faults. They tend towards NNE mostly and secondary NW. These extensional faults formed in brittle deformation domain of the upper tectonic layer in land crust, their basic structural styles is detachment of cover. The forms of the extensional faults complex are miniature horst, miniature graben, step fault and ladder fault.