江西相山铀矿田CUSD2-2孔成像光谱编录与蚀变分带研究  

Study on the Imaging Spectrum Logging and Alteration Zonation of Borehole CUSD2-2 in Xiangshan Uranium Orefield,Jiangxi Province

作　　者：潘蔚[1] 张元涛 匡元平 张川[1] 杨云汉 PAN Wei;ZHANG Yuantao;KUANG Yuanping;ZHANG Chuan;YANG Yunhan(National Key Laboratory of Remote Sensing Information and Image Analysis Technology Beijing Research Institute of Uranium Geology,Beijing 100029,China;Jiangxi Institute of Land Space Survey and Planning,Nanchang,Jiangxi 330025,China)

机构地区：[1]核工业北京地质研究院遥感信息与图像分析技术国家级重点实验室,北京100029 [2]江西省国土空间调查规划研究院,江西南昌330025

出　　处：《世界核地质科学》2023年第3期852-862,共11页World Nuclear Geoscience

基　　金：核能开发相山科学深钻2期项目(编号:遥HXS1403-10);中核集团集中研发项目“第四代铀矿勘查关键技术研究与示范(第一阶段)”砂岩型铀矿探测新技术与集成研究(编号:物SD02-03-3)联合资助

摘　　要：岩心成像光谱扫描与编录将是数字化时代地质调查和矿产资源勘查的新一代技术,通过相山铀矿田CUSD2-2孔中的应用,改进岩心成像光谱编录中的数据预处理流程及方法,并结合地质分析合理确定端元光谱和蚀变带。在CUSD2-2孔岩心成像光谱编录中,提取了长波云母、短波云母、绿泥石+云母、赤铁矿、方解石和蒙脱石共6种光谱端元,根据矿物学原理和相山铀矿田蚀变特征,认为长波云母为水云母(伊利石)化,短波云母应为绢云母(白云母)化,绿泥石+云母主要为绿泥石化;在已识别的6类热液蚀变中,赤铁矿化主要受岩石破碎带控制,其余5种蚀变受岩性和断裂破碎带双重控制。整个钻孔从上到下可分为浅部(0~980 m)中度碱性蚀变,中部(980~1230 m)原生岩石及深部(1230~2600 m)弱酸-碱耦合蚀变3个蚀变带;由于CUSD2-2孔位于两条NNE向断裂夹持部位,深部弱酸-碱耦合蚀变带的发现表明该区深部存在热液作用,进一步认为其邻区可能存在更强的酸性蚀变和伴生较好铀矿化。Core imaging spectral scanning and logging is the latest generation technology for geological survey and mineral resource exploration in digital era.This paper introduced the process and method improvement of core imaging spectral logging and its application in borehole CUSD2-2 at the northern margin of Xiangshan Basin.It focused on how to reasonably determine the spectral endmembers and divide the alteration zone in combination with geological analysis.In borehole CUSD2-2,six spectral endmembers were extracted,including longwave mica,shortwave mica,chlorite+mica,hematite,calcite,and montmorillonite.Based on the analysis of mineralogy and alteration characteristics in this area,it is believed that the longwave mica is hydromica(illite),the shortwave mica is sericite(muscovite),and the chlorite+mica is regarded as chlorite.Among the six types of alteration identified,hematitization is mainly controlled by rock fractures,while the other five types are controlled by both lithology and fracture of the rocks.The entire borehole can be divided into three alteration zones from top to bottom:shallow(0~980 m)moderate alkaline alteration zone,middle(980~1230 m)original rock zone,and deep(1230~2600 m)weak acidalkali coupling alteration zone.Since the borehole CUSD2-2 is located in the clamping part of two NNE-trending faults,the weak acid-alkali coupling alteration zone in the deep suggests that there may be hydrothermal action in the deep part of the area,which further indicates the possibility of stronger acidic alteration and associated better uranium mineralization in its adjacent areas.

关 键 词：相山铀矿田 CUSD2-2孔 端元光谱 蚀变分带 

分 类 号：P627[天文地球—地质矿产勘探]