地质学报2017，Vol.91Issue(6)：1312-1325,14.
富稀土磷酸盐及其在深海成矿作用中的贡献
REY-Rich Phosphate and Its Effects on the Deep-sea Mud Mineralization
摘要
Abstract
China carried out a systematic oceanic survey in the central North Pacific Ocean.The new data show that the total contents of rare earth elements and yttrium (REY) may exceed 2000× 10-6 in the central Pacific Basin.Combined with previous data,this study investigated the characteristics and enrichment mechanisms of REY in the deep-sea mud.It has been found that the P and ∑REY displays good correlation.The analysis of various profiles shows that ∑REY varies sensitively to P contents in sediment cores.If the samples with P content lower than 0.25％ are ruled out,the ∑REY in deep-sea mud is lower than 400 × 10-6,indicating that P content has impact on the REY.Given that phosphate in marine environment can inherit seawater negative Ce anomalies and high Y/Ho ratios,all these characteristics of REY-rich deep ocean mud are seemingly related to phosphate precipitation.Our REY leaching experiments show that most P and REY extracted from leacheate has positive relation to ∑REY and P contents.The HCl leacheate is characterized by an obvious negative Ce anomaly,and positive correlations between REY and P,regardless of ∑REY contents.In contrast,∑REY contents in the insoluble residues are low without negative Ce anomalies.Based on 12 groups of PO43-and ∑REY in the HCl leacheate,it can be estimated that phosphates in the deep-sea mud have REY abundances range between 9500 × 10 6 to 28000 × 10-6,which is coupled with that in bio-apatite of deep-sea mud.In conclusion,it can be believed that phosphate in deep-sea mud occurs mainly in REE-rich phosphate,and its REE amount is much higher than Fe-Mn oxide's and aluminosilicate's.Therefore,change of P contents is vital to REY content and modes in the deep-sea mud.Compared with the REY-poor phosphate formed in the carbonate sedimentary environment,chemical deposition and organic P diagenesis is favorable for the formation of REY-rich phosphate.关键词
富稀土磷酸盐/稀土载体/淋滤实验/深海泥/中太平洋海盆Key words
REY-rich phosphate/REY carrier/REY leaching/Deep-Sea mud/Central Pacific Basin引用本文复制引用
任江波,何高文,朱克超,邓希光,刘纪勇,傅飘儿,姚会强,杨胜雄,孙卫东..富稀土磷酸盐及其在深海成矿作用中的贡献[J].地质学报,2017,91(6):1312-1325,14.基金项目
本文为国土资源部海底矿产资源重点实验室开放基金(KLMMR-2013-A-05)、中国地质调查局地质调查项目(GZH201100303)资助的成果. （KLMMR-2013-A-05）
