粤中三水盆地过碱性长英质火山岩稀土元素赋存状态与矿化潜力研究  

Occurrence and Metallogenic Potential of Rare Earth Elements in Peralkaline Felsic Volcanic Rocks from Sanshui Basin,Central Guangdong Province

作　　者：陈佩嘉 钱波 周志伟 方念乔[2] Chen Peijia;Qian Bo;Zhou Zhiwei;Fang Nianqiao(School of Civil and Hydraulic Engineering,Xichang University,Xichang 615013,China;School of Ocean Science,China University of Geosciences,Beijing 100083,China)

机构地区：[1]西昌学院土木与水利工程学院,四川西昌615013 [2]中国地质大学(北京)海洋学院,北京100083

出　　处：《中国稀土学报》2024年第6期1214-1224,I0005,共12页Journal of the Chinese Society of Rare Earths

基　　金：国家自然科学基金项目(41572207);西昌学院博士基金项目(YBZ202264)资助。

摘　　要：稀土元素需求的增加促使稀土元素潜在来源的研究,高分异流纹岩中高含量的稀土元素被视为稀土元素的潜在来源之一。为探究高分异流纹岩中稀土元素赋存状态与富集机制,本文通过岩相学与矿物化学对粤中三水盆地中经过长期结晶分异形成的过碱性长英质火山岩进行详细研究。结果显示过碱性长英质火山岩中稀土元素相较上地壳富集3.8~11.3倍,稀土元素主要赋存于稀土氟氧化物、稀土氟碳酸盐、稀土磷酸盐与稀土氧化物四类含稀土矿物中,并以稀土氟氧化物与稀土磷酸盐矿物为主。结合过碱性长英质火山岩中稀土元素的超最低工业品位的超常富集,认为三水盆地狮岭地区过碱性长英质火山岩具有稀土元素成矿潜力。The increasing demand for rare earth elements has prompted the study of potential sources of rare earth elements,and the high content of rare earth elements in highly fractionated rhyolites is considered as one of the potential sources of rare earth elements.A detailed study of the petrology and mineral chemicaistry in peralkaline felsic volcanic rocks from Sanshui basin,which formed via prolonged fractional crystallization,aims to investigate the occurrence state and enrichment mechanism of rare earth elements in highly fractionated rhyolites.The results show that the rare earth elements in peralkaline felsic volcanic rocks are enriched by 3.8-11.3 times compared to that in the upper crust,and the rare earth elements are mainly presented in four types of rare earth bearing minerals:rare earth oxyfluoride minerals,rare earth fluor-carbonate minerals,rare earth phosphate minerals and rare earth oxide minerals,in which the rare earth oxyfluoride minerals and rare earth phosphate minerals are the mainly rare earth bearing minerals.Combined with rare earth elements content in peralkaline felsic volcanic rocks which has exceeded the industrial grade,it is thought that the peralkaline felsic volcanic rocks in the Shiling region of Sanshui Basin have rare earth element mineralization potential.

关 键 词：稀土元素 赋存状态 成矿潜力 过碱性长英质火山岩 三水盆地 

分 类 号：P575[天文地球—矿物学]