甘肃省金塔县金塔盆地天泉寺一带含煤地层时代浅析  

Brief Analysis of the Age of Coal Bearing Strata in the Tianquan Temple Area of Jinta Basin in Jinta County of Gansu Province

作　　者：鲜红兵 杨熙 Xian Hongbing;Yang Xi(The 145 Team of Gansu Coal Field Geological Bureau,Zhangye 734500,China)

机构地区：[1]甘肃煤田地质局一四五队,甘肃张掖734500

出　　处：《山东煤炭科技》2025年第4期147-151,共5页Shandong Coal Science and Technology

摘　　要：金塔盆地天泉寺一带具有西北地区典型的成煤沉积特征,是煤炭资源赋存的重要区域,但由于早期地质工作及地质勘查手段单一等技术限制,导致区内含煤地层的划分存在争议。在系统收集金塔盆地及其区内含煤地层成果资料的基础上,通过野外踏勘结合甘肃省2022年在该区域内实施的基础调查项钻孔地层划分、孢粉化石样分析测试等手段,并结合区内成煤沉积环境及古地理环境,对含煤地层进行了详细的描述。明确了金塔盆地天泉寺一带含煤地层时代为中生代白垩世,孢粉组合样鉴定中裸子植物花粉在组合中含量较多,平均占84.63%,蕨类植物孢子含量较低,Classopolis含量普遍偏低且发现了Cicatricosisporites minor(小无突肋纹孢)以及Ephedripites(Spiralipites)spp.。因此推测该组孢粉组合产出地层时代可能为早白垩世。The Tianquan Temple area in Jinta Basin has typical coal sedimentary characteristics of the northwest region and is an important area for coal resource occurrence.However,due to technical limitations such as single early geological work,geological exploration means and so on,there is controversy over the division of coal bearing strata in the area.Based on the systematic collection of achievement data on Jinta Basin and its coal bearing strata within the area,a detailed description of the coal bearing strata is carried out through field surveys,combined with means such as the basic survey items of drilling strata division,sporopollen fossil sample analysis and testing and others implemented in this area of Gansu Province in 2022,as well as the coal forming sedimentary environment and paleogeographic environment in the area.The age of coal bearing strata in the Tianquan Temple area of Jinta Basin is identified as belonging to the Mesozoic Cretaceous.In the identification of sporopollen composite sample,gymnosperm pollen is found to have a higher content in the composite sample,accounting for an average of 84.63%,while fern spore content is relatively low.The Classopolis content is generally low,and Cicatricosisporites minor and Ephedripites(Spiralipites)spp.are found.Therefore,it is speculated that the output stratigraphic age of the sporopollen combination in this group may be the Early Cretaceous.

关 键 词：金塔盆地 侏罗世 白垩世 孢粉样 

分 类 号：P618.11[天文地球—矿床学]