织金矿区大冲头井田构造发育特征

Structure Development Features in Dachongtou Minefield, Zhijin Mining Area

织金矿区大冲头井田地处纳雍织金凹褶断束东翼阿弓向斜的中段,井田总体构造形态为轴向NE的不对称向斜,断层发育,以走向NE、落差<20m的小型正断层为主,主要分布在井田的四个角、向斜两翼煤系地层出露地段及南东翼煤系地层较浅部位,对+1 350m水平以上的煤层有影响;褶皱主要分布在阿弓向斜南东翼和井田东北、西南角,挤压带次级褶曲对煤层影响较大。井田的四角部位和向斜两翼煤系地层出露地段为复杂构造,综合评价井田构造复杂程度为中等。根据井田构造基本规律,结合区域构造特征,对区内中小型构造进行了预测。

The Dachongtou minefield, Zhijin mining area is situated at middle sector of Agong syncline, east limb of Nayong-Zhijin downwarped fold fault bundle, minefield general structural form is asymmetric syncline with NE axial direction. Faults are well developed in the minefield, mainly NE strike small normal faults with throw less than 20m and mainly distributed in structural compounding parts on four corners of minefield, coal measures outcropped sectors in two limbs, shallow parts of coal measures strata in southeast limb and impact coal seams above 1350m level. Folds are mainly distributed in southeast limb of Agong syncline and east, west corners of minefield; compressive zone secondary folds have larger impact on coal seams. Four corners of minefield and two limbs of syncline have complex structures, thus the structural complexity of minefield is moderate after comprehensive assessment. Based on minefield structure basic rule combined with tectonic characteristics, medium and minor structures in the area have been predicted.