Continental shelves as potential resource of rare earth elements

被引:37
作者
Pourret, Olivier [1 ]
Tuduri, Johann [2 ]
机构
[1] UniLaSalle, 19 Rue Pierre Waguet, F-60026 Beauvais, France
[2] Bur Rech Geol & Minieres, 3 Ave Claude Guillemin, F-45100 Orleans, France
来源
SCIENTIFIC REPORTS | 2017年 / 7卷
关键词
NEODYMIUM ISOTOPES; TRACE-ELEMENTS; RIVER; REE; SEDIMENTS; OCEAN; CHEMISTRY; SEAWATER; METALS; EUROPE;
D O I
10.1038/s41598-017-06380-z
中图分类号
O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];
学科分类号
07 ; 0710 ; 09 ;
摘要
The results of this study allow the reassessment of the rare earth elements (REE) external cycle. Indeed, the river input to the oceans has relatively flat REE patterns without cerium (Ce) anomalies, whereas oceanic REE patterns exhibit strong negative Ce anomalies and heavy REE enrichment. Indeed, the processes at the origin of seawater REE patterns are commonly thought to occur within the ocean masses themselves. However, the results from the present study illustrate that seawater-like REE patterns already occur in the truly dissolved pool of river input. This leads us to favor a partial or complete removal of the colloidal REE pool during estuarine mixing by coagulation, as previously shown for dissolved humic acids and iron. In this latter case, REE fractionation occurs because colloidal and truly dissolved pools have different REE patterns. Thus, the REE patterns of seawater could be the combination of both intra-oceanic and riverine processes. In this study, we show that the Atlantic continental shelves could be considered potential REE traps, suggesting further that shelf sediments could potentially become a resource for REE, similar to metalliferous deep sea sediments.
引用
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页数:6
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