山东省五莲七宝山金铜矿床成矿模式与找矿勘查模型——来自综合物化探的证据  

Metallogenic Model and Prospecting Model of the Qibaoshan Gold-Copper Deposit in Wulian,Shandong Province:Evidence from Comprehensive Geophysical and Geochemical Exploration

作　　者：李双飞 黄鹂 陈建 朱伟 孙丽莎 王欣 彭永和 商祥鸿 邹占春 唐名鹰 高远 赵家强 LI Shuangfei;HUANG Li;CHEN Jian;ZHU Wei;SUN Lisha;WANG Xin;PENG Yonghe;SHANG Xianghong;ZOU Zhanchun;TANG Mingying;GAO Yuan;ZHAO Jiaqiang(No.8 Institute of Geology and Mineral Resources Exploration of Shandong Province,Rizhao,Shandong 276826;Key Laboratory of Nonferrous Metal Ore Exploration and Resource Evaluation of Shandong Provincial Bureau of Geology and Mineral Resources,Rizhao,Shandong 276826)

机构地区：[1]山东省第八地质矿产勘查院,山东日照276826 [2]山东省地矿局有色金属找矿与资源评价重点实验室,山东日照276826

出　　处：《地质与勘探》2023年第5期961-973,共13页Geology and Exploration

基　　金：山东省部省协议地质勘查项目五莲七宝山地区中生代岩浆演化与多金属成矿作用(编号:KY202213);山东省自然资源厅山东省五莲县长老庄地区铜铅锌多金属矿成矿远景调查(编号:鲁勘字[2020]30号);山东省自然资源厅鲁东中生代盆地边缘地区有色金属矿床成矿系列及找矿方向研究(编号:鲁勘字[2020]18号);山东省五莲县邢家沟地区铜铅锌多金属矿普查(编号:鲁勘字[2022]30号)联合资助。

摘　　要：山东省胶莱盆地南缘发现了多处火山机构,随着五莲七宝山角砾岩筒型金铜多金属矿的发现,说明胶莱盆地南缘具有良好的成矿前景。但从目前发现的矿床来看,无论是数量还是规模均与成矿条件不匹配,亟需总结该区成矿模式和勘查模型,为胶莱盆地南缘铜多金属矿勘查提供找矿方向及方法。本文以七宝山矿床为解剖对象,开展了地球物理和地球化学综合探测。研究发现七宝山杂岩体对应地球物理特征为高磁异常,隐爆角砾岩筒的γ能谱显示U元素、Th元素和能谱总量∑均为低异常,隐爆角砾岩筒在重力剖面上呈重力高异常。地球化学特征以Ag、Pb、Au、Cu元素异常为主,各元素异常套合好,主要元素具有明显的二、三级分带。以上物化探特征均是成矿作用特征标志。在此基础上给出了七宝山地区成矿模式,建立了综合找矿勘查模型,成功预测了隐爆角砾岩筒深部延伸特征,建立了七宝山地区陆相火山热液型矿床成矿模式和找矿勘查模型。Several volcanic structures have been found in the southern margin of Jiaolai Basin,Shandong Province.With the discovery of breccia tube copper gold polymetallic deposit in Wulian Qibaoshan,it shows that the southern margin of Jiaolai Basin has good metallogenic prospects.However,from the current discovered deposits,both in quantity and scale,they do not match the ore-forming conditions.It is urgent to summarize the ore-forming model and exploration model in this area,in order to provide prospecting directions and methods for the exploration of copper polymetallic deposits in the southern margin of the Jiaolai Basin.In this paper,the Qibaoshan deposit is taken as the anatomical object to carry out comprehensive geophysical and geochemical exploration.It is found that the corresponding geophysical characteristics of Qibaoshan complex are high magnetic anomaly.The gamma spectra of cryptoexplosive breccia tube show that U element,Th element and total energy spectrumΣare all low anomalies,and the cryptoexplosive breccia tube is high gravity anomaly on the gravity profile.The geochemical characteristics are dominated by Ag,Pb,Au and Cu element anomalies,which are well matched,and the main elements have obvious second-order and third-order zoning.The above geophysical and geochemical characteristics are all indicators of mineralization characteristics.On this basis,the metallogenic model of the Qibaoshan area is given,the comprehensive prospecting and exploration model is established,the deep extension characteristics of cryptoexplosive breccia tube are successfully predicted,and the metallogenic model and prospecting and exploration model of continental volcanic hydrothermal deposits in the Qibaoshan area are established.

关 键 词：综合地球物理 找矿勘查模型 角砾岩筒 七宝山 山东 

分 类 号：P618.51[天文地球—矿床学]