南岭东段龙源坝燕山期黑云母花岗岩的锆石微量元素特征及地质意义  

Zircon Trace Element Geochemistry of Yanshanian Biotite Granite from Longyuanba Complex in the Eastern Nanling Range and Its Geological Significance

作　　者：陶继华[1,2,3] 李武显[4] 杨跃贵 石争 唐文佳 TAO Jihua;LI Wuxian;YANG Yuegui;SHI Zheng;TANG Wenjia(Jiangxi Provincial Key Laboratory of Genesis and Prospect for Strategic Minerals,East China University of Technology,Nanchang 330013,China;State Key Laboratory of Nuclear Resources and Environment,East China University of Technology,Nanchang 330013,China;School of Earth Sciences,East China University of Technology,Nanchang 330013,China;State Key Laboratory of Isotope Geochemistry,Guangzhou Institute of Geochemistry,Chinese Academy of Sciences,Guangzhou 510640,China)

机构地区：[1]东华理工大学战略性矿产成矿理论与深部预测江西省重点实验室,江西南昌330013 [2]东华理工大学核资源与环境国家重点实验室,江西南昌330013 [3]东华理工大学地球科学学院,江西南昌330013 [4]中国科学院广州地球化学研究所同位素地球化学国家重点实验室,广东广州510640

出　　处：《东华理工大学学报（自然科学版）》2024年第5期431-441,共11页Journal of East China University of Technology(Natural Science)

基　　金：国家自然科学基金项目(41963002,42063001)。

摘　　要：为研究南岭地区高分异花岗岩的岩浆源区物质和成岩过程,对南岭东段龙源坝燕山期黑云母花岗岩进行了LA-ICP-MS锆石微量元素成分分析。结果表明,根据微量元素组成可以将锆石分为两组:第一组为岩浆演化相对早阶段结晶的锆石,不含磷灰石等细颗粒包裹体;第二组为岩浆演化相对晚阶段结晶的锆石,含有一定量的磷灰石等细颗粒包裹体。龙源坝燕山期黑云母花岗岩的岩浆结晶温度为667~916℃,平均为761℃;氧逸度(lg f(O_(2)))为-14.3~-12.5,相对氧逸度(ΔFMQ)为-1.4~0.3,平均为-0.2。该岩浆经历了磷灰石、榍石、锆石和斜长石等矿物的强烈分离结晶作用,最终形成了高分异I型黑云母花岗岩。In order to study the character of magmatic source materials and pegtrogenetic processes of the highly fractionated granites in Nanling range,the zircon trace elements are analyzed by LA-ICP-MS from the Yanshanian biotite granite in Longyuanba complex,eastern the Nanling range.The results indicate that zircon can be divided into two groups based on its trace element composition:the first group is zircon crystallized in a relatively early stage of magma evolution,without fine-grained inclusions such as apatite.The second group consists of zircons crystallized in a relatively late stage of magma evolution,containing a certain amount of fine-grained inclusions such as apatite.The magma crystallization temperature of the Yanshanian biotite granite in Longyuanba is 667~916℃,with an average of 761℃;The oxygen fugacity is lg f(O_(2))=-14.3~-12.5,the relative oxygen fugacity(ΔFMQ)is-1.4~0.3,and the average is-0.2.The magma underwent strong separation and crystallization of minerals such as apatite,sphene,zircon,and plagioclase,ultimately forming a highly differentiated I-type biotite granite.

关 键 词：锆石 微量元素 岩石成因 花岗岩 龙源坝 

分 类 号：P595[天文地球—地球化学]