赣南宁都火斜麻岩体含离子吸附型稀土矿地质特征  

GEOLOGICAL CHARACTERISTICS OF ION ADSORPTION TYPE RARE EARTH DEPOSITS IN THE HUOXIEMA PLUTON,NINGDU,SOUTHERN JIANGXI

作　　者：宛胜 刘杨 唐石 吕勃烨 孙超 贺彬 张健仁 陈士海 凡秀君 袁振国 WAN Sheng;LIU Yang;TANG Shi;LV Bo-ye;SUN Chao;HE Bin;ZHANG Jian-ren;CHEN Shi-hai;FAN Xiu-jun;YUAN Zhen-guo(Basic Geological Survey Institute,Jiangxi Geological Survey and Exploration Institute,Nanchang 330000;Yunnan Provincial Institute of Land and Resources Planning and Design,Kunming 650216)

机构地区：[1]江西省地质调查勘查院基础地质调查所,江西南昌330000 [2]云南省国土资源规划设计研究院,云南昆明650216

出　　处：《云南地质》2024年第3期379-387,共9页Yunnan Geology

基　　金：江西1∶50000宁都县、黄石、长胜幅矿产地质调查项目(NJZX-W-2018-055);江西九岭-幕阜山地区锂、钽、铌、金等战略性矿产地质调查评价项目(DZDC-2023-005);赣南地区稀有金属成矿作用与综合利用研究(KY-2022-010)。

摘　　要：宁都县火斜麻一带花岗岩风化壳中花岗岩离子吸附型稀土矿,其母岩主要为不同粒级似斑状黑云母二长花岗岩和二云母二长花岗岩,属强过铝质高分异钾玄-高钾钙碱性花岗岩,稀土元素配分曲线型式向右倾斜“V”字型,富集Rb、Th、K等大离子不相容元素,亏损Ba、Sr、P、Ti、Nb、Ta等高场强元素。形成于伸展构造背景,与后碰撞花岗岩类似,源区为变泥质岩石,经岩浆自交代作用,热液蚀变等内生成矿作用形成易氧化分解的稀土矿物,再经表生风化、富集作用形成风化壳离子吸附型稀土矿床。The parent rocks of ion adsorption type rare earth deposits in the graniteweathering crust inHuoxiema area,Ningdu County,are mainly porphyritic biotite diorite and biotite diorite granite of different grain sizes,belonging to strongly peraluminous and highlyfractionated shoshonite-high-K calc-alkaline granite.The rare earth element distribution curve of which are inclined to the right in a“V”shape,enriched in large ion incompatible elements such as Rb,Th and K,and deficient in high field strength elements such as Ba,Sr,P,Ti,Nb and Ta.They were formed in an extensional tectonic background,similar to post-collisional granite.The source area of them was metamorphic mudstone,which went through magma self-metasomatism,hydrothermal alteration,and other endogenous mineralization,and formed easily oxidizable and decomposable rare earth minerals.After surface weathering and enrichment,the weathering crust ion adsorption type rare earth deposits were formed.

关 键 词：伸展构造 离子吸附型 火斜麻花岗岩体 赣南地区 江西宁都 

分 类 号：P618.7[天文地球—矿床学]