摘要
针对陆相火山沉积—改造型矿床翁孔坝铜矿成矿作用复杂、传统方法找矿难度较大的问题,采用构造地球化学勘查技术,选择地表及花地矿段1098 m中段矿(化)体分布区作为研究对象,对元素数据进行整理,绘制构造地球化学异常图,分析地球化学场的空间变化特征。研究结果表明:矿区存在火山沉积成矿和构造改造成矿作用相互叠加;矿区构造控矿作用明显,矿化元素组合异常在SN向呈带状出现,成矿元素组合异常在近EW向呈相邻式分布;在构造地球化学异常平面图上,岩性不整合面、岩性分界面和断裂交会部位因子得分多交叉、重叠,F3、F4和F5这3个因子重叠部位及其附近可作为找矿重点靶区。本次勘查工作共圈定5处找矿靶区,经初步工程验证,显示该区具有广阔的找矿前景。
The Wengkongba copper deposit,situated in Jinggu County,Pu’er City,Yunnan Province,is part of the northern segment of the South Lancangjiang volcanic arc metallogenic belt.It is categorized as a continental volcanic sedimentary-reformed deposit characterized by complex mineralization processes,which pose challenges to conventional prospecting methods.In recent years,advancements in tectonogeochemical exploration technology have positioned it as a pivotal approach for the prediction of concealed orebodies.This study employs tectonogeochemical anomaly analysis to integrate the characteristics of tectonogeochemical element associations,anomaly distribution patterns,and their indicative significance.The primary findings are as follows:Surface factor analysis of the deposit area distinctly reveals the coexistence of two significant mineralization processes,namely volcanic sedimentary mineralization and tectonic reworking mineralization.Among the extracted factors,factor F5 suggests the potential superimposition of alkali-rich acidic magmatic hydrothermal fluids,which may have played a significant role in the later stages of mineralization.Factor F1 indicates distinct lithofacies zonation within the intermediate-basic volcanic rock series,providing valuable insights into the geological context of mineralization.Notably,the volcanic lithofacies in the northern part of factor F6 and the undivided T_(2) strata,located in the western part of the deposit area,exhibit a pronounced tendency towards copper enrichment and mineralization during the volcanic sedimentary-diagenetic mineralization stage,thereby emerging as potential key zones for mineralization.Furthermore,the tectonic influence on mineralization in the Wengkongba copper deposit is particularly prominent,with anomalies in ore-forming element associations displaying a distinct belt-like distribution along the north-south axis.This distribution pattern clearly demonstrates that the SN-trending faults,lithological unconformity interfaces,and lithological boundaries in the region function as significant ore-conducting structures,facilitating the migration of oreforming fluids.Concurrently,the spatial arrangement of these element association anomalies along the near-EW(east-west)direction strongly suggests that the deposit is predominantly influenced by EW-trending faults.These EW-trending faults have been identified as the primary ore-controlling structures that dictate the ultimate emplacement of orebodies.Furthermore,multi-element association anomaly analysis reveals that the factor scores of various ore-forming elements frequently intersect and overlap at specific locations where lithological unconformities,lithological boundaries,and faults converge.The intersection and overlapping zones,along with their adjacent regions,have been identified as primary targets for exploration in this study,as they are highly probable locations for ore body accumulation.Based on the a forementioned research findings,five prospecting targets were delineated within the Wengkongba copper deposit area.Subsequent drilling validation in these target areas yielded significant results,uncovering multiple layers of concealed copper-lead mineralized ore bodies of considerable thickness and extent.These findings not only confirm the efficacy of tectonogeochemical exploration techniques in this deposit but also suggest that the Wengkongba copper deposit possesses substantial resource potential,thereby establishing a solid foundation for the further development and utilization of mineral resources in the region.
作者
郑玄
常俊山
鹿峰宾
殷传印
邓毅
李娇
ZHENG Xuan;CHANG Junshan;LU Fengbin;YIN Chuanyin;DENG Yi;LI Jiao(Shandong Gold Geologic Minerals Survey Co.,Ltd.,Laizhou 261400,Shandong,China)
出处
《黄金科学技术》
北大核心
2026年第1期91-102,共12页
Gold Science and Technology
基金
山东黄金集团科技项目“滇西南民乐翁孔坝铜矿勘查区主要控矿因素分析及找矿方向”(编号:21C1018)资助。
关键词
构造地球化学
聚类分析
因子分析
沉积成岩期
构造改造期
靶区验证
tectonic-geochemistry
cluster analysis
factor analysis
sedimentary diagenesis period
tectonic transformation period
target verification
