甘肃省金塔县紫山子地区含煤地层时代研究

摘要

There ate different opinions on the coal-bearing strata age in northern part of the Jinta County, Gansu Province, due to lack of sufficient paleontologic materials. During the Gansu Provincial Coal Geological Exploration Institute did 1/50000 geological mapping and coal exploration in this area, in order to identify some issues on the age of coal-bearing strata, a few fossil plants and sporopollen fossil samples had been collected. The conclusion of the fossil plant identification considered that the plants should be early to middle Jurassic Period in age. But relatively rich fossils have been found in sporopollen samples after analysis; through correlation with corresponding sporopollen assemblages has confirmed the age of coal-bearing strata in the area is Middle Jurassic Epoch.%甘肃省金塔县北部(紫山子地区)含煤地层,由于地质工作程度低,古生物资料比较缺乏,对含煤地层时代认识尚不一致.为解决含煤地层时代及探讨找煤前景,在所选剖面的不同层位中采集到少量古植物化石及孢粉样品.古植物化石鉴定为早中侏罗世常见分子；孢粉样品经分析获得了较为丰富的化石,经研究并与时代相当的孢粉组合对比,确定当前组合时代为中侏罗世.