广东天堂山锡多金属矿床成矿物质来源及就矿找矿思路  

Sources of ore-forming materials and prospecting ideas for the Tiantangshan tin polymetallic deposit,Guangdong Province

作　　者：张志辉[1,2] 张达[1] 胡擘捷 贾宏翔 贾儒雅[2] 耿林 ZHANG Zhihui;ZHANG Da;HU Bojie;JIA Hongxiang;JIA Ruya;GENG Lin(China University of Geosciences,Beijing 100083,China;Development and Research Centre,China Geological Survey,Beijing 100037,China;China Geological Survey,Beijing 100037,China)

机构地区：[1]中国地质大学(北京),北京100083 [2]中国地质调查局发展研究中心,北京100037 [3]中国地质调查局,北京100037

出　　处：《地质通报》2022年第10期1887-1898,共12页Geological Bulletin of China

基　　金：国家自然科学基金项目《赣东北塔前-赋春推覆构造及其对超大型钨铜矿成矿作用的控制》(批准号:41772069);中国地质调查局项目《老矿山找矿技术创新与示范项目》(编号:1212011220737);《全国重要矿集区找矿预测项目》(编号:DD20160052);《矿集区矿产调查及深部找矿预测》(编号:DD20190570)。

摘　　要：广东天堂山锡多金属矿床位于南岭成矿带的东段,河源深断裂带与大东山-浰源-罗浮东西向深断裂带交会处附近,中生代大长沙火山岩盆地中南部边缘。在分析该矿床成矿地质条件的基础上,针对矿石的硫-铅同位素组成开展了相关研究,探讨成矿物质来源。矿石的硫同位素分析结果表明,成矿热液的δ^(34) S_(ΣS)存在2个峰值,分别为-0.5‰~0‰和5‰~6.5‰。根据矿床地质特征和类似矿床的硫同位素组成,认为成矿热液的初始硫源主要为岩浆硫,在成矿过程中因与浅部流体的混合,成矿热液的硫同位素组成发生了一定变化。矿石的铅同位素结果显示,铅的来源与造山带源区有关,主要为上地壳铅,可能存在地幔铅的参与。结合华南中生代大规模成矿作用的相关研究认识,根据矿区地质特征、成矿流体演化和成矿物质来源的分析,本文探讨了天堂山锡矿受构造控制的岩体侵位与成矿流体运移过程,并由此提出以成矿地质体和控矿构造为中心的“由脉找体、由晕找源由体找脉、由源找带”的就矿找矿思路,期望为天堂山地区的找矿勘查工作提供帮助。The Tiantangshan tin polymetallic deposit is located in the eastern part of the Nanling metallogenic belt,near the junction of the Heyuan deep fault zone and the Dadongshan-Liyuan-Luofu east-west deep fault zone,and the middle and southern margin of the Mesozoic Dachangsha volcanic rock basin.Based on the analysis of the ore-forming geological conditions of the deposit,this paper carried out related research on the sulfur and lead isotope compositions of the ore and discussed the source of ore-forming materials.The sulfur isotope analysis of ore shows that theδ^(34) S_(ΣS) of the ore-forming hydrothermal fluid has two peaks,which are-0.5‰~0‰and 5‰~6.5‰,respectively.According to the geological characteristics of the deposit and the sulfur isotopic composition of similar deposits,this paper believes that the initial sulfur source of the ore-forming hydrothermal fluid is mainly magmatic sulfur.During the mineralization process,the sulfur isotopic composition of the ore-forming hydrothermal fluid changed due to mixing with the shallow fluid.The lead isotope results of the ore show that the source of lead is related to the source area of the orogenic belt,which is mainly the lead from upper crust,and there may also be the participation of lead from mantle.Combining with the understanding of the large-scale mineralization of the Mesozoic in South China,basing on the exploration of the geological characteristics of the mining area,the evolution of metallogenic fluids and the source of metallogenic materials,this paper discussed the mineralization process of the deposit and put forward the ideas for prospecting,hoping to contribute to the prospecting and exploration work in the Tiantangshan area.

关 键 词：锡多金属矿 硫-铅同位素组成 成矿物质来源 就矿找矿思路 广东天堂山 矿产勘查工程 

分 类 号：P618.44[天文地球—矿床学]