铀矿地质2025，Vol.41Issue(5)：799-809,11.DOI:10.3969/j.issn.1000-0658.2025.41.055
海拉尔盆地克鲁伦凹陷浅部地层孢粉组合特征及其地质意义
Characteristics and Geological Significance of Spore Pollen Assemblages in Shallow Strata of Kelulun Sag,Hailar Basin
摘要
Abstract
In order to accurately determine the prospecting target layer and age of sandstone-type uranium deposits in Kelulun sag,Hailaer Basin,Inner Mongolia,dark gray mudstone samples were collected from boreholes,and sporopollen fossils were analyzed and identified.The results showed that the sporopollen in the shallow strata was characterized by the development of Alsophila spinulosa and Monospore.The sporopollen assemblage was dominated by moss and fern spores,with a content of 25.95%-88.64%at the average of 54.82%.Gymnosperm pollen followed,with a content of 11.36%-74.05%at the average of 45.18%;no angiosperm pollen was found.This is similar to the spore-pollen assemblage zone of Lower Cretaceous Yimin Formation.Based on the geological conditions of regional uranium mineralization,it is considered that the shallow strata in the area should be divided into the upper part of Lower Cretaceous Yimin Formation.The shallow strata were formed in a warm and humid tropical paleoclimate environment,sand body in the strata has good permeability and high reduction capacity,which can be regarded as favorable prospecting targets.关键词
目的层时代/孢粉组合/砂岩型铀矿/克鲁伦凹陷Key words
target layer age/spore-pollen combination/sandstone-type uranium deposits/Kelulun sag分类
天文与地球科学引用本文复制引用
王长虹,周文博,王常东,李阳,万宏峰,张荣,穆海旗..海拉尔盆地克鲁伦凹陷浅部地层孢粉组合特征及其地质意义[J].铀矿地质,2025,41(5):799-809,11.基金项目
中国核工业地质局项目"内蒙古呼伦贝尔市海拉尔地区铀矿资源调查评价"(编号:202102)资助. （编号:202102）
