华东地质2025，Vol.46Issue(1)：33-54,22.DOI:10.16788/j.hddz.32-1865/P.2024.05.010
赣南中生代海罗岭稀有金属矿床成因——基于云母微量元素的研究
Genesis of the Mesozoic Hailuoling granite-pegmatite rare-metal deposit in southern Jiangxi Province—based on the trace-element study in mica
摘要
Abstract
The Hailuoling deposit,which is located in Shicheng County,southern Jiangxi,is a granitic peg-matite-type Nb-Ta-Zr-W-Sn-Li-Rb polymetallic deposit formed in the Mesozoic.Previous studies have focused on the geological characteristics of the deposit,but have not elucidated its formation mechanism yet.This re-search analyzed the micas in the fine-grained albite granite,greisenized granite,greisen,and pegmatite in the Hailuoling deposit by electron probe microanalysis(EPMA)and laser ablation inductively coupled plasma mass spectrometry(LA-ICP-MS).The results show that micas in the fine-grained albite granite are dominated by lepi-dolite and zinnwaldite.In greisenized granite and greisen,micas are composed of protolithionite.The micas in pegmatite are mainly zinnwaldite and protolithionite.These rocks did not evolve according to the order of gradual increase of lithium content from granite→greisenized granite→greisen→pegmatite.Furthermore,compared to the greisenized granite and greisen,the micas in the fine-grained albite granite contain higher Rb,Li,and F but a lower K/Rb ratio.The regularity of major and trace elements possibly indicates a product of a more intense frac-tionation process of the same magmatic source.The sieve-like textures in the pegmatite suggested that the deposit experienced a transition from slow nucleation in the early stage to rapid undercooling in the later stage.By com-paring the characteristics of the deposits and minerals in pegmatite between Hailuoling deposit and Koktokay de-posit,it is inferred that the two deposits have similar ore-forming mechanism.Both of them experienced crystal fractionation dominated by melts,fluid exsolution,and the coexistence of melts and fluids.Some minerals crystal-lized under slow undercooling and solidified under rapid cooling conditions during the emplacement of the melt-fluid coexistence system,forming the granitic pegmatite-type deposit far away from the magma chamber and characterized with a mixture of various rock types.关键词
稀有金属矿床/花岗伟晶岩型/云母微量元素/海罗岭/可可托海/赣南Key words
rare-metal deposit/granite-pegmatite type/trace elements of micas/Hailuoling/Koktokay/southern Jiangxi分类
地质学引用本文复制引用
许箭琪,郭春丽,闫金禹,张斌武,赵迁迁,周睿..赣南中生代海罗岭稀有金属矿床成因——基于云母微量元素的研究[J].华东地质,2025,46(1):33-54,22.基金项目
国家自然科学基金"南岭'东钨西锡'空间规律的关键制约因素:基于精细矿物学对岩浆过程差异性的研究(编号:92162210)"和"南岭锡田印支期与燕山期花岗岩钨锡成矿能力的差异性(编号:42172096)"项目联合资助. （编号:92162210）
