四川大陆槽稀土矿隐爆角砾岩中石英闪长岩的形成时代及其意义  

Formation Age and its Geological Significance of Quartz Diorite from Cryptoexplosive Breccia in Dalucao Rare Earth Mine,Sichuan Province

作　　者：杨伟 夏小洪 刘图强 程龙 谢志远 刘上荣 谭洪旗 YANG Wei;XIA Xiaohong;LIU Tuqiang;CHENG Long;XIE Zhiyuan;LIU Shangrong;TAN Hongqi(Sichuan Geological and Mineral Resources Group Co.,Ltd.,Chengdu 610016,Sichuan,China;Liu Tuqiang Strategic Mineral Resources Innovation Studio,Chengdu 610016,Sichuan,China;Institute of Multipurpose Utilization of Mineral Resources,CAGS,Chengdu 610041,Sichuan,China;Sichuan Hedi Mining Development Co.,Ltd.,Liangshan 615500,Sichuan,China)

机构地区：[1]四川省地质矿产(集团)有限公司,四川成都610016 [2]刘图强战略性矿产资源创新工作室,四川成都610016 [3]中国地质科学院矿产综合利用研究所,四川成都610041 [4]四川和地矿业发展有限公司,四川凉山615500

出　　处：《矿产综合利用》2025年第1期8-15,29,共9页Multipurpose Utilization of Mineral Resources

基　　金：四川省科技厅项目(2023ZDZX0005、2022ZHCG0124);四川省自然资源厅项目(KJ-2024-010)。

摘　　要：四川德昌大陆槽稀土矿区广泛分布有隐爆角砾岩,主要为石英闪长岩。为限制石英闪长岩的形成年龄,本文开展了LA-ICP-MS锆石U-Pb年代学研究。结果显示,石英闪长岩锆石LA-ICP-MS U-Pb年龄为(751.7±4.6) Ma(n=39),代表了其成岩年代为新元古代,与扬子地块西缘和北缘大量的中酸性侵入体和火山岩具有相近的形成年龄。大陆槽隐爆角砾岩形成于地壳浅部,为稀土矿床的形成提供了通道与有利的保存条件,暗示大陆槽深部稀土找矿潜力大。To limit the diagenetic age of quartz diorite in the crypto-explosion breccia of the Dechang Dalucao in Sichuan Province,LA-ICP-MS zircon U-Pb chronology was carried out.The results show that the LA-ICP-MS U-Pb age of the Dalucao quartz diorite zircon is(751.7±4.6)Ma(n=39),indicating that the diagenetic age is Neoproterozoic,which is similar to the formation age of a large number of medium acid intrusions and volcanic rocks in the western and northern margins of the Yangtze Block.The Dalucao crypto-explosion breccia was formed in the shallow part of the crust,which provided a channel and favorable preservation conditions for the formation of rare earth deposits,suggesting that the deep part of the Dalucao has great potential for rare earth prospecting.

关 键 词：德昌 大陆槽 石英闪长岩 锆石 地质意义 

分 类 号：P597.3[天文地球—地球化学]