摘要
小红石砬子铅锌(银)矿床是吉中—延边成矿带典型的中型矿床。为进一步厘清矿区断裂构造分布形式,查明矿体分布规律,指导找矿勘查,本文运用化极、延拓、高通滤波等方法,对小红石砬子铅锌(银)矿区高精度磁测数据进行了再处理,结合地质和化探资料综合分析,构建了地球物理找矿模型。具体成果如下:(1)圈定了M-1,M-2,M-3共3个高磁异常,通过综合分析,认定这些异常是潜在的找矿靶区;(2)通过高精度磁测异常与化探结果的对比,认为上述靶区内具有一定的资源潜力,实施的钻孔证实了靶区M-2的有效性;(3)推断出矿区内共有8条主断裂带(1条东西向,7条南北向)和7条次级断裂带(2条东西向,5条南北向);(4)推测矿区中间环形构造是古火山通道,其周围的高值异常可能指示着古寄生火山(侵入岩枝)的存在。上述成果深化了对矿区内断裂构造分布形式和矿体分布规律的认识,证明了高精度磁测在小红石砬子铅锌(银)矿区找矿勘查工作中的有效性,从地球物理的角度为矿区进一步找矿勘查工作部署提供了理论依据。
The Xiaohongshilazi Pb-Zn(Ag)deposit is a typical medium-sized lead-zinc deposit in the Jizhong—Yanbian Metallogenic Belt.In order to further clarify the distribution pattern of fault structures and the regularity of orebody distribution within orefield,and therefore guiding exploration,this paper reprocessed the high-precision magnetic survey data from the Xiaohongshilazi Pb-Zn(Ag)orefield.Combined with geological and geochemical exploration data,the methods including pole reduction,continuation and high-pass filtering have been used to construct the geophysical exploration model.The specific achievements are as follows:three high magnetic anomalies(M-1,M-2,M-3)were delineated,and these anomaly zones are identified as potential exploration targets through comprehensive analysis of geological data;it is inferred that the aforementioned target areas possess certain potential resources by comparing high-precision magnetic survey results with geochemical exploration outcomes,then recent drilling works have confirmed the validity of target M-2;a total of 8 major faults(1 EW-trending and 7 NS-trending)and 7 secondary faults(2 EW-trending and 5 NS-trending)within orefield were inferred;and it is speculated that the central annular structure within orefield represents an ancient volcanic conduit,and the surrounding high-value anomalies may indicate the presence of ancient parasitic volcanoes(intrusive branches).These findings expand the understanding of the distribution pattern of fault structures and the regularity of orebody distribution within orefield,validate the effectiveness of high-precision magnetic surveys in exploration work within the Xiaohongshilazi Pb-Zn(Ag)orefield,and provide a theoretical basis for the deployment of further exploration activities within orefield from a geophysical perspective.
作者
雷欣儒
王达
马虎超
刘子安
王贵龙
王高天
LEI Xinru;WANG Da;MA Huchao;LIU Zi'an;WANG Guilong;WANG Gaotian(School of Earth Sciences and Resources,China University of Geosciences(Beijing),Beijing 100083,China)
出处
《矿产勘查》
2024年第12期2290-2306,共17页
Mineral Exploration
基金
吉林省三河矿业开发有限公司委托项目“小红石砬子铅锌多金属—玉石矿构造控矿分析及成矿预测”(3-4-2021-120)
地质调查项目“内蒙古自治区四子王旗白乃庙铜矿及外围金铜多金属矿普查”(H90063)联合资助。
关键词
小红石砬子
铅锌银矿床
高精度磁测
定位预测
找矿勘查
Xiaohongshilazi
Pb-Zn(Ag)deposit
high-precision magnetic measurement
orebody location prediction
ore exploration
