Rare earth elements (REE)-Minerals in the Silius fluorite vein system (Sardinia, Italy)

被引：0
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作者：
Mondillo, N. [1 ,2 ]
Boni, M. [1 ]
Balassone, G. [1 ]
Spoleto, S. [1 ]
Stellato, F. [1 ]
Marino, A. [3 ]
Santoro, L. [2 ]
Spratt, J. [2 ]
机构：
[1] Dipartimento di Scienze della Terra, Dell'Ambiente e delle Risorse, Università degli Studi di Napoli Federico II, via Mezzocannone 8, Napoli,80134, Italy
[2] Department of Earth Sciences, Natural History Museum, Cromwell Road, London,SW7 5BD, United Kingdom
[3] Fluorite di Silius S.p.A. Viale Merello 14, Cagliari,09023, Italy
来源：
Ore Geology Reviews | 2016年 / 74卷
关键词：
The Silius vein system; located in SE Sardinia (Italy) is analogous to other late- to post-Hercynian mineral systems of this type in Europe. The Silius system consists of two main veins; characterized by several generations of fluorite; calcite and quartz; with initial ribbon-like geometries; followed by breccias and cockade-like textures. In this study; aimed at investigating the REE concentrations in the Silius vein system; a REE average of ~800ppm (locally σREE >1500ppm) has been observed in the carbonate gangue of the fluorite orebody. These amounts are related to the presence of the REE-bearing minerals synchysite-(Ce) and xenotime-(Y). The chemical composition of synchysite-(Ce) has been obtained by wavelength dispersive spectrometry (WDS). The average synchysite-(Ce) formula; built on the basis of (CO3)2F and 5 negative charges; is Ca1.07(La0.19; Ce0.36; Pr0.04; Nd0.15; Sm0.03; Gd0.03; Y0.13)(CO3)2F. From their geochemical characteristics; and their textural relationships with other gangue phases; it is likely that synchysite-(Ce) and xenotime-(Y) formed at the same P-T-X conditions as the other minerals of the Silius fluorite mineralization. Synchysite-(Ce) and xenotime-(Y) at Silius could be related to a local circulation phenomenon; where the REE are derived from a REE-bearing source rock in the basement of southeastern Sardinia; which has been leached by the same fluids precipitating the fluorite/calcite mineralization. REE concentrations contained in the carbonate gangue of still unexploited parts of the Silius vein deposit; as well as in dumps and tailings accumulated during past fluorite processing; could possibly represent a sub-economic by-product of the fluorite exploitation. © 2015 Elsevier B.V;
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