Hydrothermal cerium oxide in manganese-oxide-cemented breccia, Quadrilátero Ferrífero of Minas Gerais, Brazil

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Marco E. Ciriotti
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Hydrothermal cerium oxide in manganese-oxide-cemented breccia, Quadrilátero Ferrífero of Minas Gerais, Brazil

Messaggio da Marco E. Ciriotti » gio 19 mar, 2020 10:37

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Referenza:
▪ Cabral, A.R., Rios, F.J., Eustáquio Dias A.L., Laufek, F., Martins Graça, L. (2020): Hydrothermal cerium oxide in manganese-oxide-cemented breccia, Quadrilátero Ferrífero of Minas Gerais, Brazil. Neues Jahrbuch für Mineralogie - Abhandlungen: Journal of Mineralogy and Geochemistry, 196, (in press).

Abstract:
Cerium (Ce) oxide has been found in Mn-oxide-cemented breccia in the Quadrilátero Ferrífero of Minas Gerais, and identified as cerianite-(Ce) on the basis of backscattered-electron imaging and energy-dispersive spectrometry. The Ceoxide compound occurs as nano- to microscale crystals that are dispersed within, or locally concentrated along, colloform bands of cryptomelane, and in open spaces. The breccia shows a prominent positive anomaly of Ce and has enrichment of Mn, Cd and Hg. The occurrence of abundant cryptomelane, a mineral typically formed under near-surface conditions, and its colloform bands that cement angular fragments of vein quartz suggest that Ce oxide directly precipitated as colloidal particles by supersaturation under low-temperature hydrothermal conditions that followed seismic rupturing. This scenario is remarkable because little is known about natural Ce oxide of hydrothermal origin.
Marco E. Ciriotti

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