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江西九岭南缘古阳寨地区铍矿化伟晶岩独居石U-Pb定年及其地质意义 被引量:1

U-Pb Dating of Monazite from the Beryllium Mineralized Pegmatite and Its Geological Significance in the Guyangzhai Area at the Southern Margin of Jiuling,Jiangxi
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摘要 以江西九岭南缘古阳寨地区铍矿化伟晶岩为研究对象,选取规模较大的藏龙洞铍矿化伟晶岩脉,通过野外地质调查和LA-ICP-MS测定独居石U-Pb年龄测定,初步了解了九岭南缘古阳寨地区花岗伟晶岩地质特征。结果表明,九岭南缘古阳寨地区铍矿化伟晶岩成岩成矿年龄为(138.57±0.78) Ma,归属于早白垩世。铍矿化伟晶岩侵入于九岭南缘古阳寨中细粒含斑二云母二长花岗岩体内部,形成时代略晚于燕山期古阳寨岩体,显示两者在空间和时间上具有密切的成因联系,推测古阳寨地区铍矿化伟晶岩为古阳寨岩体二云母二长花岗岩结晶分异而成。建议针对古阳寨二云母二长花岗岩体内部和外接触带0~5 km范围内,加强调查力度,以期实现该区域内伟晶岩型铍矿找矿突破。 Taking the beryllium mineralized pegmatite in the Guyangzhai area,southern margin of Jiuling,Jiangxi province as the research object,a significant beryllium mineralized pegmatite vein from the Canglongdong was investigated.Through field geological survey and LA-ICP-MS monazite U-Pb age determination,the geological characteristics of granite pegmatites in the Guyangzhai area were preliminarily understood.The results indicate that the beryllium mineralized pegmatites in the Guyangzhai area at the southern Jiuling margin were formed during the early Cretaceous period,with a precise age of(138.57±0.78)Ma.The beryllium mineralized pegmatite intrudes into the fine-grained porphyritic two-mica monzonite granite of the Guyangzhai pluton that located at the southern margin of Jiuling,slightly later than the Yanshanian Guyangzhai pluton.This finding suggests a close spatial and temporal relationship between the two plutons.It is speculated that the beryllium mineralized pegmatite in the Guyangzhai area was originated from the crystallization differentiation of the two-mica monzonite granite within the Guyangzhai pluton.Therefore,it is recommended to place greater emphasis on investigation within 0~5 km range of the inner and outer contact zones of the Guyangzhai two-mica monzonite granite to facilitate breakthroughs in pegmatite type beryllium ore prospecting in this area.
作者 徐喆 张福神 张芳荣 张勇 周渝 徐进 黄成伟 贺彬 龙立学 XU Zhe;ZHANG Fushen;ZHANG Fangrong;ZHANG Yong;ZHOU Yu;XU Jin;HUANG Chengwei;HE Bin;LONG Lixue(State Key Laboratory of Nuclear Resources and Environment,East China University of Technology,Nanchang 330013,China;Institute of Basic Geological Survey,Jiangxi Geological Survey and Exploration Institute,Nanchang 330030,China)
出处 《东华理工大学学报(自然科学版)》 CAS 北大核心 2024年第1期13-21,共9页 Journal of East China University of Technology(Natural Science)
基金 国家自然科学基金项目(42062006,41962007) 江西省地质局青年科学技术带头人培养计划项目(2022JXDZKJRC04) 江西省地质局科技研究项目(2022JXDZKJKY02)。
关键词 独居石U-Pb定年 铍矿化伟晶岩 古阳寨地区 九岭南缘 U-Pb dating of monazite beryllium mineralized pegmatite Guyangzhai area southern margin of Jiuling
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