伊犁盆地南缘洪海沟矿床头屯河组下段含矿砂体结构及氧化带分布特征  

Stratigraphic Structure of Host Sand Body and Distribution Feature of Oxidation Zone in the Lower Member of Toutunhe Formation in Honghaigou Deposit,Southern Margin of Yili Basin

作　　者：郭锐 罗星刚[1] 王毛毛[1] 张虎军[1] 张占峰[1] GUO Rui;LUO Xinggang;WANG Maomao;ZHANG Hujun;ZHANG Zhanfeng(Geologic Party No.216,CNNC,Urumqi,Xinjiang 830011,China)

机构地区：[1]核工业二一六大队,新疆乌鲁木齐830011

出　　处：《铀矿地质》2023年第5期780-789,共10页Uranium Geology

基　　金：中国核工业地质局项目“新疆伊犁盆地及周边地区砂岩型铀矿资源调查评价”(编号:202205)资助。

摘　　要：伊犁盆地作为中国重要的产铀基地,在盆地南缘相继发现一系列大、中型可地浸砂岩型铀矿床,洪海沟矿床是盆地铀成矿区西部矿集区重要的矿床之一,目前主要层位头屯河组下段沿北西向仍有进一步扩大的潜力,但含矿目的层的砂体结构、氧化带空间展布尚有待精细化研究。为此,文章在充分利用钻孔岩心、测井资料及样品分析测试结果的基础上,结合地质背景,通过钻孔数据统计及连井剖面对比,综合运用沉积学及砂岩型铀成矿理论,对研究区含矿目的层砂体结构、氧化带分布特征进行研究。研究区含矿砂体骨架结构可划分出4种类型:砂-煤接触面型、一杂两灰夹两黄型、下灰上黄型和基底接触式型。不同地段含矿砂体空间展布具有差异性,部分地段可划分为上、下亚段。含矿层氧化砂体呈现出3种产出样式:含矿层氧化砂体产出于头屯河组下段上亚段与杂色泥岩底板直接接触部位,含矿层氧化砂体在上、下亚段均见产出,含矿层氧化砂体只产出于灰色泥岩夹层下伏下亚段砂体。本次研究结果可为该地区下一步铀矿勘查工作提供指导。As an important uranium production base in China,a series of large and medium-sized in-situ leachable sandstone-type uranium deposits have been discovered in the southern margin of Yili Basin.As an important uranium deposits in the western part of the basin,Honghaigou deposit was believed with potential for further exploration in the lower member of Toutunhe Formation along the NW direction,however,the sand body structure of the ore host layer and the spatial distribution of the oxidation zone are not clearly understood at present.This paper made a comprehensive study in sedimentology and metallogeny on the target layers with the borehole core,logging data and sample assay.The framework structure of ore-hosting sand body in the study area was divided into four types:sand-coal contact surface type,one miscellaneous two gray sandwiched two yellow type,lower gray upper yellow type and basement contact type.The oxidized sand body of the ore-host target layer was found in three occurrence patterns:layer directly contacting with the floor of the mixed mudstone in the upper subsection of the lower section,layer in both the upper and lower subsections,layer in the lower submember of the gray mudstone interlayer.The research results will provide guidance for the next step of uranium exploration in this area.

关 键 词：砂岩型铀矿 含矿砂体 氧化带 头屯河组下段 洪海沟矿床 伊犁盆地 

分 类 号：P619.14[天文地球—矿床学]