干旱区生态环境知识资源中心(Arid): Quadrivalent praseodymium in planetary materials

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DOI	10.2138/am-2020-7325
	Quadrivalent praseodymium in planetary materials
	Anenburg, Michael; Burnham, Antony D.; Hamilton, Jessica L.
通讯作者	Anenburg, M
来源期刊	AMERICAN MINERALOGIST
ISSN	0003-004X
EISSN	1945-3027
出版年	2020
卷号	105 期号:12 页码:1802-1811
英文摘要	Praseodymium is capable of existing as Pr3+ and Pr4+. Although the former is dominant across almost all geological conditions, the observation of Pr4+ by XANES and Pr anomalies (both positive and negative) in multiple light rare earth element minerals from Nolans Bore, Australia, and Stetind, Norway, indicates that quadrivalent Pr can occur under oxidizing hydrothermal and supergene conditions. High-temperature REE partitioning experiments at oxygen fugacities up to more than 12 log units more oxidizing than the fayalite-magnetite-quartz buffer show negligible evidence for Pr4+ in zircon, indicating that Pr likely remains as Pr3+ under all magmatic conditions. Synthetic Pr4+-bearing zircons in the pigment industry form under unique conditions, which are not attained in natural systems. Quadrivalent Pr in solutions has an extremely short lifetime, but may be sufficient to cause anomalous Pr in solids. Because the same conditions that favor Pr4+ also stabilize Ce4+ to a greater extent, these two cations have similar ionic radii, and Ce is more than six times as abundant as Pr, it seems that Pr-dominant minerals must be exceptionally rare if they occur at all. We identify cold, alkaline, and oxidizing environments such as oxyhalide-rich regions at the Atacama Desert or on Mars as candidates for the existence of Pr-dominant minerals.
英文关键词	Praseodymium cerium rare earth elements oxygen fugacity XANES redox
类型	Article
语种	英语
收录类别	SCI-E
WOS记录号	WOS:000596797900004
WOS关键词	SUSHINA HILL COMPLEX ; OXIDATION-STATE ; X-RAY ; ELECTRICAL-CONDUCTIVITY ; NEAR-EDGE ; OXYGEN AVAILABILITY ; CARBONATITIC ROCKS ; CRYSTAL-STRUCTURE ; DEFECT CHEMISTRY ; MARTIAN SOIL
WOS类目	Geochemistry & Geophysics ; Mineralogy
WOS研究方向	Geochemistry & Geophysics ; Mineralogy
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/327873
作者单位	[Anenburg, Michael; Burnham, Antony D.] Australian Natl Univ, Res Sch Earth Sci, Canberra, ACT 2600, Australia; [Hamilton, Jessica L.] ANSTO, Australian Synchrotron, Clayton, Vic 3168, Australia
推荐引用方式 GB/T 7714	Anenburg, Michael,Burnham, Antony D.,Hamilton, Jessica L.. Quadrivalent praseodymium in planetary materials[J],2020,105(12):1802-1811.
APA	Anenburg, Michael,Burnham, Antony D.,&Hamilton, Jessica L..(2020).Quadrivalent praseodymium in planetary materials.AMERICAN MINERALOGIST,105(12),1802-1811.
MLA	Anenburg, Michael,et al."Quadrivalent praseodymium in planetary materials".AMERICAN MINERALOGIST 105.12(2020):1802-1811.