九岭南缘宜丰—奉新锂矿田锂矿成矿模式  

Metallogenic model of lithium deposits in the Yifeng-Fengxin lithium ore field on the southern edge of Jiuling Mountain

作　　者：周建廷 罗微 熊燃 Zhou Jianting;Luo Wei;Xiong Ran(Jiangxi Exploration Breakthrough Technology Center,Nanchang 330052;The First Geological Brigade of Jiangxi Geological Bureau,Nanchang 330052)

机构地区：[1]江西省找矿突破勘查技术中心,南昌330052 [2]江西省地质局第一地质大队,南昌330052

出　　处：《地质科学》2025年第1期250-271,共22页Chinese Journal of Geology(Scientia Geologica Sinica)

基　　金：江西省技术创新引导类“科技+地质”联合计划项目(编号:2023KDG01004);江西省重点研发计划“揭榜挂帅”项目(编号:20223BBG71015)资助。

摘　　要：甘坊复式岩体含矿性和锂矿成矿岩体以往都被认为是白水洞岩体。对于锂等稀有金属成矿作用是岩浆分异作用,还是热液交代作用,目前尚存在争议。为了从矿田整体上(而不是单一矿床)厘清锂矿成矿期次、成矿机制,总结该地区锂矿成矿模式,笔者研究了该地区不同矿床的同位素年代学、矿床地质、岩相学、地球化学特征。在前人研究成果的基础上,笔者分析和归纳了本区燕山期甘坊复式岩体成岩成矿作用,并首次构建了九岭南缘宜丰—奉新锂矿田锂矿成矿模式。认为锂矿成矿为多期次、多岩体成矿,与燕山期再生的原始S型花岗质岩浆结晶分异和后期岩浆热液流体自交代作用有关。宜丰—奉新锂矿田为构造—岩浆岩控矿,是同源岩浆局部熔融,经过多次脉动、涌动侵位,岩浆晶粥体不断活化、熔体抽离、稀有金属多次活化迁移,富集成矿的。成矿特征受含矿花岗岩浆的侵入规模,分异作用的演化发展程度,岩浆后期热液流体交代作用,老变质泥岩对含矿流体的屏蔽作用,成矿岩体放射性核素的产热作用,岩体剥蚀深度等因素控制。九岭南缘宜丰—奉新锂矿田历经以下5个阶段:1)含稀有金属花岗岩岩浆源岩建造的形成和发展阶段;2)岩浆熔体形成、熔体结晶分异演化、花岗岩复式岩体的累积生长阶段;3)岩浆晚期热液交代成矿阶段;4)裂隙充填、脉状花岗细晶(斑)岩形成阶段;5)岩体剥蚀和风化阶段。The ore-forming properties of the Ganfang complex rock mass and the lithium ore-forming rock mass were previously believed to be the Baishuidong rock mass.There is still controversy over whether the mineralization of rare metals such as lithium is magmatic differentiation or hydrothermal metasomatism.To clarify the mineralization stages and mechanisms of lithium deposits(rather than a single deposit),and summarize the lithium deposit mineralization models in the region,the author studied the isotopic chronology,deposit geology,petrology,and geochemical characteristics of different deposits in the region.Based on previous research results,the author analyzed and summarized the diagenesis and mineralization of the Yanshanian Ganfang complex rock mass in this area,and for the first time constructed a lithium mineralization model in the Yifeng-Fengxin lithium ore field on the southern edge of the Jiuling Mountain.It is believed that the mineralization of lithium deposits is a multi-stage,multi rock mineralization,which is related to the crystallization differentiation of the original S-type granitic magma regenerated during the Yanshanian Period and the self-metasomatism of later magmatic hydrothermal fluids.The Yifeng-Fengxin lithium ore field is controlled by structure and magmatic rock,which is locally fused by homologous magma.After multiple pulsations and surging emplacement,the magmatic crystal mush is continuously activated,the melt is extracted,and rare metals are activated and migrated for many times to enrich and mineralize.The mineralization characteristics are controlled by factors such as the intrusion scale,frequency,evolution and development degree of differentiation of ore bearing granite magma,hydrothermal fluid metasomatism in the later stage of magma,the shielding effect of old metamorphic mudstone on mineral bearing fluids,the heat generation effect of radioactive nuclides in mineralized rock masses,and the depth of rock erosion.The Yifeng-Fengxin lithium deposit field on the southern edge of Jiul

关 键 词：燕山期 岩浆晶粥 岩浆分异作用 岩浆热液交代作用 成矿模式 精细结构 宜丰—奉新锂矿田 

分 类 号：P618.71[天文地球—矿床学]