1:25万开县幅、万县幅地质调查成果与进展

原定为青白口纪的龙潭河组时代应属早南华世;在志留系顶部发现一套岩层,认为存在中泥盆统云台观组;万县与通江两地层小区的下—中侏罗统存在相变过渡关系;城巴断裂以北分布较小型侵入岩体。重点调查研究了具重要控矿作用的城巴断裂和直接影响三峡库区稳定性的七曜山断裂带新构造运动。

1:250 000 Kaixian and Wanxian Sheets in Chongqing

The formerly Qingbaikouan Longtanhe Formation should be assigned to the Early Nanhuan strata. A succession of 18-22 m thick of yellowish grey fine-to medium-grained quartzitic sandstones intercalated with lithic quartzsiltite is found to occur at the top of the Silurian strata in the Baiquan-Shiguanmen zone, Kaixian and in Miaoba, Chengkou, and thought to be the Middle Devonian Yuntaiguan Formation. The facies transition exists in the Lower-Middle Jurassic strata in Wanxian and Tongjiang regions. The small-sized intrusive rocks are scattered in the areas north of the Chengba fault. The neotectonism within the Chengba and Qiyaoshan faults are examined in particular.