REE phosphates vs REE carbonates in the Bahoruco karst bauxites, Dominican Republic

Cristina Villanova-De-benavent; Joaquín A. Proenza; Cristina Domènech; Pol Suñer; Thomas Aiglsperger; Lisard Torró; Australia Ramírez; Jesús Rodríguez

REE phosphates vs REE carbonates in the Bahoruco karst bauxites, Dominican Republic

Cristina Villanova-De-benavent, Joaquín A. Proenza, Cristina Domènech, Pol Suñer, Thomas Aiglsperger, Lisard Torró, Australia Ramírez, Jesús Rodríguez

Sección de Ingeniería de Minas

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution › peer-review

Abstract

The mineralogy and mineral chemistry of REE phosphates and REE carbonates has been investigated in three localities of the Bahoruco karst bauxites, Dominican Republic, by means of powder X-ray diffraction (XRD), petrographic microscopy, scanning electron microscopy (SEM-EDS) and electron microprobe (EMP). The identified REE minerals include primary REE phosphates (monazite) and secondary REE phosphates, carbonates, and oxides. This work is focused on the secondary REE phosphates and carbonates. Phosphates are mostly enriched in Y and HREE (Gd, Dy), whereas carbonates display a wide range of compositions in terms of LREE (La, Ce, Nd, Sm) and HREE (Gd) contents. Geochemical stability data suggest that the dominant REE solid phase present depends on the total concentration of carbonate and/or phosphate in the solution, carbonates being more stable at pH around 7.

Original language	Spanish
Title of host publication	Proceedings of the 16th SGA Biennial Meeting
Pages	408-411
Number of pages	4
Volume	1
State	Published - 1 Jan 2022

Cite this

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title = "REE phosphates vs REE carbonates in the Bahoruco karst bauxites, Dominican Republic",

abstract = "The mineralogy and mineral chemistry of REE phosphates and REE carbonates has been investigated in three localities of the Bahoruco karst bauxites, Dominican Republic, by means of powder X-ray diffraction (XRD), petrographic microscopy, scanning electron microscopy (SEM-EDS) and electron microprobe (EMP). The identified REE minerals include primary REE phosphates (monazite) and secondary REE phosphates, carbonates, and oxides. This work is focused on the secondary REE phosphates and carbonates. Phosphates are mostly enriched in Y and HREE (Gd, Dy), whereas carbonates display a wide range of compositions in terms of LREE (La, Ce, Nd, Sm) and HREE (Gd) contents. Geochemical stability data suggest that the dominant REE solid phase present depends on the total concentration of carbonate and/or phosphate in the solution, carbonates being more stable at pH around 7.",

author = "Cristina Villanova-De-benavent and Proenza, {Joaqu{\'i}n A.} and Cristina Dom{\`e}nech and Pol Su{\~n}er and Thomas Aiglsperger and Lisard Torr{\'o} and Australia Ram{\'i}rez and Jes{\'u}s Rodr{\'i}guez",

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T1 - REE phosphates vs REE carbonates in the Bahoruco karst bauxites, Dominican Republic

AU - Villanova-De-benavent, Cristina

AU - Proenza, Joaquín A.

AU - Domènech, Cristina

AU - Suñer, Pol

AU - Aiglsperger, Thomas

AU - Torró, Lisard

AU - Ramírez, Australia

AU - Rodríguez, Jesús

PY - 2022/1/1

Y1 - 2022/1/1

N2 - The mineralogy and mineral chemistry of REE phosphates and REE carbonates has been investigated in three localities of the Bahoruco karst bauxites, Dominican Republic, by means of powder X-ray diffraction (XRD), petrographic microscopy, scanning electron microscopy (SEM-EDS) and electron microprobe (EMP). The identified REE minerals include primary REE phosphates (monazite) and secondary REE phosphates, carbonates, and oxides. This work is focused on the secondary REE phosphates and carbonates. Phosphates are mostly enriched in Y and HREE (Gd, Dy), whereas carbonates display a wide range of compositions in terms of LREE (La, Ce, Nd, Sm) and HREE (Gd) contents. Geochemical stability data suggest that the dominant REE solid phase present depends on the total concentration of carbonate and/or phosphate in the solution, carbonates being more stable at pH around 7.

AB - The mineralogy and mineral chemistry of REE phosphates and REE carbonates has been investigated in three localities of the Bahoruco karst bauxites, Dominican Republic, by means of powder X-ray diffraction (XRD), petrographic microscopy, scanning electron microscopy (SEM-EDS) and electron microprobe (EMP). The identified REE minerals include primary REE phosphates (monazite) and secondary REE phosphates, carbonates, and oxides. This work is focused on the secondary REE phosphates and carbonates. Phosphates are mostly enriched in Y and HREE (Gd, Dy), whereas carbonates display a wide range of compositions in terms of LREE (La, Ce, Nd, Sm) and HREE (Gd) contents. Geochemical stability data suggest that the dominant REE solid phase present depends on the total concentration of carbonate and/or phosphate in the solution, carbonates being more stable at pH around 7.

UR - https://confer.eventsair.com/sga2022/proceedings--volumes

M3 - Contribución a la conferencia

VL - 1

SP - 408

EP - 411

BT - Proceedings of the 16th SGA Biennial Meeting

ER -

REE phosphates vs REE carbonates in the Bahoruco karst bauxites, Dominican Republic

Abstract

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