内蒙古川井坳陷巴彦花组砂岩碎屑锆石年代学特征对物源及砂岩型铀矿勘查的启示  

Inspiration of Zircon Chronological Characteristics of Sandstone Fragments from Bayanhua Formation in Chuanjing Depression,Inner Mongolia on Exploration of Source and Sandstone Type Uranium Deposits

作　　者：何泽宇 陈磊 李成元 樊松浩 薄海军 高琪 苏攀云 刘伟[1] 靖安 HE Zeyu;CHEN Lei;LI Chengyuan;FAN Songhao;BO Haijun;GAO Qi;SU Panyun;LIU Wei;JING An(Hohhot General Survey of Natural Resources Center,China Geological Survey,Hohhot 010010,Inner Mongolia,China)

机构地区：[1]中国地质调查局呼和浩特自然资源综合调查中心,内蒙古呼和浩特010010

出　　处：《西北地质》2025年第1期186-203,共18页Northwestern Geology

基　　金：中国地质调查局项目“内蒙古二连盆地川井−达日罕乌拉地区砂岩型铀矿勘查”(DD20211549);“内蒙古哈达门沟金矿南矿带金多金属资源勘查”(DD20220972)联合资助。

摘　　要：早白垩世是二连盆地演化的一个重要演化阶段,其构造环境与沉积物源的探讨对该盆地铀矿成因研究具有重要启示意义。笔者以二连盆地西部川井坳陷下白垩统巴彦花组为主要研究对象,通过碎屑锆石LA-ICP-MS U-Pb定年,结果显示下白垩统巴彦花组下部与上部具有不同年龄峰值,其下部为1800~2100 Ma的主年龄峰值;其上部为250~330 Ma的主年龄峰值,综合区域内各地质体年代学研究,认为巴彦花组沉积物质来源主要为宝音图隆起、索伦山隆起和狼山-白云鄂博隆起。结合钻孔综合测井结果,认为下白垩统巴彦花组下部具有较高的U含量,可作为研究区及周边寻找砂岩型铀矿的主要目标层位。The early Cretaceous is an important evolutionary stage of the evolution of the Erlian basin,and the exploration of its tectonic environment and sediment sources has significant implications for the study of the genesis of uranium deposits in the basin.This article focuses on the Bayanhua Formation of the Lower Cretaceous in the Chuanjing depression of the western Erlian basin.Through the dating results of detrital zircon LAICP-MS U-Pb,it is shown that the lower and upper parts of the Bayanhua Formation of the Lower Cretaceous have different age peaks,with the lower part having a main age peak of 1800~2100 Ma;The upper part of the Bayanhua Formation has a main age peak of 250~330 Ma.Based on the study of plastid chronology in various regions,it is believed that the sedimentary materials mainly come from the Baoyintu uplift,Sorenshan uplift,and Langshan Baiyunebo uplift.Based on the comprehensive drilling logging results,it is believed that the lower part of the Bayanhua Formation in the Lower Cretaceous has a high uranium content,which can be used as the main target layer for searching for sandstone type uranium deposits in the study area and surrounding areas.

关 键 词：川井坳陷 二连盆地 下白垩统 碎屑锆石LA-ICP-MS U-Pb定年 砂岩型铀矿 

分 类 号：P597[天文地球—地球化学] P694.14[天文地球—地质学]