开放成矿系统元素迁移负异常结构对深部找矿预测的意义  

The Significance of Elemental Mass-transfer in Open Metallogenic System for Deep-buried Ore Prospecting

作　　者：刘艳鹏 朱立新 周永章 LIU Yanpeng;ZHU Lixin;ZHOU Yongzhang(State Key Laboratory of Nuclear Resources and Environment,East China University of Technology,Nanchang 330013,Jiangxi,China;Guangdong Provincial Key Laboratory of Geological Processes and Mineral Resource Survey,Guangzhou 510275,Guangdong,China;Centre for Earth Environment and Resources,Sun Yat-sen University,Guangzhou 510275,Guangdong,China;China Geological Survey,Beijing 100037,China)

机构地区：[1]东华理工大学核资源与环境国家重点实验室,江西南昌330013 [2]广东省地质过程与矿产资源探查重点实验室,广东广州510275 [3]中山大学地球环境与地球资源研究中心,广东广州510275 [4]中国地质调查局,北京100037

出　　处：《大地构造与成矿学》2020年第2期251-257,共7页Geotectonica et Metallogenia

基　　金：中国地质调查局项目(DD20190305);国家重点研发计划重点专项(2016YFC0600506)联合资助。

摘　　要：在开放体系成矿过程中,成矿信息应具有时间和空间两方面的属性。空间属性表现为元素在赋矿空间的分布及变化,时间属性则表现为成矿过程中元素的迁移变化。本文以安徽省兆吉口铅锌矿床为例,通过Grant方程进行元素质量迁移研究,建立Na2O负异常结构,并应用成分数据理论的双标图对负异常结构进行验证,结果发现负异常结构携带着时间维度上的成矿信息。成矿元素Pb、Zn的正异常分布于Na2O负异常范围内。Na2O与Pb、Zn、Au负相关,Au与Pb、Zn呈弱负相关,表明该地区可能存在与Pb、Zn同一成矿作用不同成矿阶段形成的Au矿化/体。兆吉口地区的找矿方向应为Pb、Zn、Au三种矿产资源。Na2O负异常在深部并未结束,表明深部仍可能存有矿体。In any metallogenic system,ore-forming information has time and space attributes.The distribution and variation of elements in the ore-bearing space are information of the spatial attribute,whereas element mass-transfer during ore-forming processes is information of the time attribute.A case study has carried out on the Zhaojikou lead-zinc deposit in Anhui province.Grant equation was used to study the elemental mass-transfer and the Na2O negative anomaly structure was constructed.Then,the Na2O negative anomaly structure was confirmed by the biplot of the compositional data theory.The results showed that the negative anomaly structure carries ore-forming information of time dimension.The positive anomalies of ore-forming elements like Pb and Zn are distributed within the negative anomalies of Na2O.Na2O is negatively correlated with Pb,Zn and Au,whereas Au is negatively correlated with Pb and Zn.It is suggested that there may be an Au mineralization/body formed in the same ore-forming system but different stages.Therefore,besides Pb and Zn,Au should be one of the prospecting targets in the Zhaojikou area.In addition,the continuous Na2O negative anomaly in the deep may indicate possible occurrence of deep-buried ore bodies.

关 键 词：开放成矿系统 成分数据 质量迁移 铅锌矿床 兆吉口 

分 类 号：P612[天文地球—矿床学]