广东惠州石坝-黄沙洞地区岩石放射性生热率特征研究  

Characteristics of radioactive heat production rate of rocks in Shiba-Huangshadong area,Huizhou,Guangdong Province

作　　者：田峰 祁士华[1,2] 王帅[2] 肖志才[1] 旷健 Tian Feng;Qi Shihua;Wang Shuai;Xiao Zhicai;Kuang Jian(State Key Laboratory of Biogeology and Environmental Geology,China University of Geosciences(Wuhan),Wuhan 430074;School of Environmental Studies,China University of Geosciences(Wuhan),Wuhan 430074)

机构地区：[1]中国地质大学(武汉)生物地质与环境地质国家重点实验室,武汉430074 [2]中国地质大学(武汉)环境学院,武汉430074

出　　处：《地质科学》2020年第4期1277-1289,共13页Chinese Journal of Geology(Scientia Geologica Sinica)

基　　金：中国地质调查局地调项目(编号:1212011220014);国家地热资源及中等城市地下空间开发利用示范项目资助。

摘　　要：岩石的放射性生热是地热资源的重要热源之一,为研究广东惠州石坝—黄沙洞地区岩石放射性生热率特征,本文系统采集了石坝—黄沙洞地区不同岩性的样品,测定其密度及产热元素含量,对花岗岩样品进行锆石LA-ICP-MS U-Pb同位素定年。结果表明:研究区内不同岩性中花岗岩的放射性生热率最高(均值5.81µW/m^3),但是变化范围较大(2.83µW/m^3~9.07µW/m^3);U、Th对生热率的贡献基本相等,K的贡献一般低于10%,部分沉积地层样品可达20%;花岗岩的生热率与时间关系密切,在~150 Ma具有明显峰值。初步结论认为:研究区内岩性对岩石生热率具有显著影响,花岗岩的生热率最高;花岗岩的生热率受岩体形成时的区域岩浆事件影响,在~150 Ma形成的花岗岩具有最高的生热率,有利于干热岩的勘查开发。The radioactive heat production of rocks is an important heat source of geothermal resources.To study the characteristics of radioactive heat production rate of rocks in the Shiba-Huangshadong area of Huizhou,Guangdong Province,samples with different lithologies in the Shiba-Huangshadong area were systematically collected.The density and contents of heat-producing elements were tested for all samples.The zircon U-Pb isotope dating was performed for granite samples by LA-ICP-MS.The results show that the granitoids have the highest radioactive heat production rate(mean value 5.81µW/m^3)with a large variation range(2.83µW/m^3~9.07µW/m^3)among different lithologies in the study area;The contribution of U and Th is similar to the heat production rate,and the contribution of K is generally less than 10%,except some sedimentary samples whose contribution can reach 20%.The heat production rates of granites are closely related to time,and the rocks with age about 150 Ma have the highest heat generation rate.The preliminary conclusions are that the lithology in the study area has a significant effect on the heat production rate of the rocks.With a large variation range,the heat production rate of the granites is the highest among different lithologies.Influenced by the regional magmatic events during the emplacement of the rock plutons,the granite samples formed at^150 Ma have the highest heat production rate,which is beneficial to the exploration and development of hot and dry rocks.

关 键 词：广东 黄沙洞地热田 放射性生热率 年龄分布特征 

分 类 号：P314[天文地球—固体地球物理学] P598[天文地球—地球物理学]