Enrichment characteristics and sources of the critical metal yttrium in Zhijin rare earth-containing phosphorites, Guizhou Province, China  

作　　者：Xingxiang Gong Shengwei Wu Yong Xia Zhengwei Zhang Shan He Zhuojun Xie Jiafei Xiao Haiying Yang Qingping Tan Yi Huang Yuhong Yang 

机构地区：[1]Institute of Geochemistry,Chinese Academy of Sciences,Guiyang 550081,China [2]University of Chinese Academy of Sciences,Beijing 100049,China [3]Technology Innovation Center of Mineral ResourcesExplorations in Bedrock Zones,Ministry of Natural Resources,Guiyang 550081,China [4]Reserve Bureau of Land and Mineral Resources of Guizhou Province,Guiyang 550081,China [5]School of Earth Sciences,Yunnan University,Kunming 650500,China

出　　处：《Acta Geochimica》2021年第3期441-465,共25页地球化学学报（英文）

基　　金：supported by the National Natural Science Foundation of China (No. U1812402);the Public Beneficial and Basic Geological Project from the Department of Land and Resources of Guizhou Province (No. 2016-09-1)。

摘　　要：Yttrium(Y)is a critical metallic element that is used widely in modern scientific,technological,and industrial applications.Phosphorites in the Zhijin area of Guizhou Province,China,are famous for Y enrichment,but the enrichment characteristics and sources remain unclear.Previous studies suggested that the sources of rare earth elements(REEs,La-Lu)and Y(REYs,La-Lu+Y)were related to hydrothermal deposition.However,this study presents evidence refuting that hypothesis,with major and trace elemental data collected with quadrupoleinductively coupled plasma-mass spectrometry(Q-ICPMS)analysis.These data show that Y in Zhijin REYscontaining phosphorites has a normal distribution and is particularly enriched relative to other REYs.The Y enrichment degree is different at different∑REY intervals.Specifically,the Y enrichment degree is higher at lower∑REY values and lower at higher∑REY values.The REYs-containing phosphorites show features of primary phosphorites.Both REEs and Y have good correlations with P2 O5 in the phosphorites with low REYs contents(total REYs<535 ppm),whereas at high REYs contents(total REYs>535 ppm),REEs have a good correlation with P2 O5 but Y does not.Inconsistent enrichment processes of REYs are suggestive of complex sources of Y.Thus,seafloor hydrothermal fluids were not the direct source of Y.Normal seawater mixed with terrestrial sources might have contributed to the origin of Y here.This study could lead to improvements in Y mineral resource explorations and the situation involving the global REYs supply crisis.

关 键 词：YTTRIUM PHOSPHORITES Rare earth elements Trace elements Enrichment processes 

分 类 号：P619.2[天文地球—矿床学]