靖远磁窑晚石炭世沉积环境基本特征

磁窑地区晚石炭世为滨海环境，由２个较大的沉积旋回组成。纳缪尔晚期以河流环境开始，逐渐被沼泽、潮坪－泻湖环境代替，形成第１个旋回。维斯发早期为滨海三角洲环境，逐渐演变成泻湖－潮坪环境，最后为碳酸盐台地，以最大的海侵活动结束。

BASIC FEATURES OF LATE CARBONIFEROUS SEDIMENTARY ENVIRONMENT AT CIYAO IN JINGYUAN COUNTY, GANSU

There was an alternating environment Of the terrestrial and the marine facies during theLate Carboniferous time in the Ciyao region. In Late Namurian,this rigion was a river andtidal flat-lagoon environment, which showed the sedimentation took place the zone near thesea board. This rigion was a delta in Early Westphalian. And then,the rigion became tidalflat-lagoon environment again in the Middle Westphalian. Up to the Late Westphalian agreater inundation formed platform environment of carbonatite. The Late Namurian and theWestphalian,each appeared a big sedimentary cycle. The sedimental type of Late Carbonifer-ous was the Qilian Form.