江西相山火成岩岩石磁学分析及其地质意义  

Rock Magnetic Analysis of Igneous Rocks and Its Geological Significance in Xiangshan,Jiangxi Province

作　　者：韩佰惠 葛坤朋 谢孝军 姬晴 王彦国 邓居智 HAN Baihui;GE Kunpeng;XIE Xiaojun;JI Qing;WANG Yanguo;DENG Juzhi(School of Geophysics and Measurement-control Technology,East China University of Technology,Nanchang 330013,China;SINOPEC Geophysical Corporation Shengli Branch,Dongying 257086,China)

机构地区：[1]东华理工大学地球物理与测控技术学院,江西南昌330013 [2]中石化石油工程地球物理有限公司胜利分公司,山东东营257086

出　　处：《东华理工大学学报(自然科学版)》2024年第6期564-574,共11页Journal of East China University of Technology(Natural Science)

基　　金：国家自然科学基金项目(42174091,42274185);江西省科技计划项目(20212BCJ23002,20232ACB213013);江西省“双千计划”项目(DHSQT42023003)。

摘　　要：为获取江西相山火山盆地火成岩的精确物性,服务深部地球物理勘探,采用综合岩石磁学方法对相山地区碎斑熔岩、流纹英安岩和花岗斑岩三大主要火成岩类型进行了系统对比研究。研究表明,同一岩性在不同区域的磁学特征具有显著差异,碎斑熔岩的载磁矿物可划分为磁铁矿/赤铁矿混合型和磁铁矿主导型,流纹英安岩分为磁铁矿/赤铁矿混合型和赤铁矿主导型,花岗斑岩的磁性较弱,磁性差异不明显。碎斑熔岩的磁性晕带指示了相山古火山口位置。本研究厘定了相山地区典型火山岩的岩石磁学类型,可为寻找古/次火山口成矿机构,开展深部铀矿勘查提供依据。To acquire accurate physical properties of the igneous rocks within the Xiangshan volcanic basin in Jiangxi,facilitating deep geophysical uranium exploration,the magnetism of the three main igneous rock types in the Xiangshan region—porphyroclastic lava,rhyodacite,and granite porphyry—has been comprehensively analyzed.Rocks of the same lithology exhibit significant magnetic differences across regions.It shows that the porphyroclastic lava comprises magnetite/hematite mixtures and magnetite-dominated types.The rhyodacite is classified into magnetite/hematite mixed type,hematite-dominated type,and the granite porphyry exhibits weak magnetism with little variance.The magnetic halos of porphyroclastic lava indicate ancient crater locations.The magnetic signatures of typical volcanic rocks in Xiangshan have been identified,paving the way for locating ancient/sub-volcanic crater mineralization institutions and conducting deep uranium exploration.

关 键 词：火成岩 岩石磁学 磁铁矿 赤铁矿 相山铀矿田 

分 类 号：P318[天文地球—固体地球物理学] P631.2[天文地球—地球物理学]