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Colás, V.; Padrón-Navarta, J.A.; González-Jiménez, J.M.; Griffin, W.L.; Fanlo, I.; O'Reilly, S.Y.; Gervilla, F.; Proenza, J.A.; Pearson, N.J.; Escayola, M.P. "Compositional effects on the solubility of minor and trace elements in oxide spinel minerals: Insights from crystal-crystal partition coefficients in chromite exsolution" (2016) American Mineralogist. 101(6):1360-1372
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Abstract:

Chromite from Los Congos and Los Guanacos in the Eastern Pampean Ranges of Córdoba (Argentinian Central Andes) shows homogenous and exsolution textures. The composition of the exsolved phases in chromite approaches the end-members of spinel (MgAl2O4; Spl) and magnetite (Fe2+Fe23+${\\text{Fe}}-2{3 + }$O4; Mag) that define the corners of the spinel prism at relatively constant Cr3+/R3+ ratio (where R3+ is Cr+Al+Fe3+). The exsolution of these phases from the original chromite is estimated to have accounted at ≥600 °C on the basis of the major element compositions of chromite with homogenous and exsolution textures that are in equilibrium with forsterite-rich olivine (Fo95). The relatively large size of the exsolved phases in chromite (up to ca. 200 μm) provided, for the first time, the ability to conduct in situ analysis with laser ablation-inductively coupled plasma-mass spectrometry for a suite of minor and trace elements to constrain their crystal-crystal partition coefficient between the spinel-rich and magnetite-rich phases (DiSpl/Mag$D-{\\text{i}}^{{\\text{Spl/Mag}}}$). Minor and trace elements listed in increasing order of compatibility with the spinel-rich phase are Ti, Sc, Ni, V, Ge, Mn, Cu, Sn, Co, Ga, and Zn. DiSpl/Mag$D-{\\text{i}}^{{\\text{Spl/Mag}}}$ values span more than an order of magnitude, from DTiSpl/Mag$D-{{\\text{Ti}}}^{{\\text{Spl/Mag}}}$ = 0.30 ± 0.06 to DZnSpl/Mag$D-{{\\text{Zn}}}^{{\\text{Spl/Mag}}}$= 5.48 ± 0.63. Our results are in remarkable agreement with data available for exsolutions of spinel-rich and magnetite-rich phases in other chromite from nature, despite their different Cr3+/R3+ ratio. The estimated crystal-crystal partitioning coefficients reflect the effect that crystal-chemistry of the exsolved phases from chromite imposes on all investigated elements, excepting Cu and Sc (and only slightly for Mn). The observed preferential partitioning of Ti and Sc into the magnetite-rich phase is consistent with high-temperature chromite/melt experiments and suggests a significant dependence on Fe3+ substitution in the spinel structure. A compositional effect of major elements on Ga, Co, and Zn is observed in the exsolved phases from chromite but not in the experiments; this might be due to crystal-chemistry differences along the MgFe-1-Al2Fe-23+${\\text{Fe}}-{-2}^{3 + }$ exchange vector, which is poorly covered experimentally. This inference is supported by the strong covariance of Ga, Co, and Zn observed only in chromite from layered intrusions where this exchange vector is important. A systematic increase of Zn and Co coupled with a net decrease in Ga during hydrous metamorphism of chromitite bodies cannot be explained exclusively by compositional changes of major elements in the chromite (which are enriched in the magnetite component). The most likely explanation is that the contents of minor and trace elements in chromite from metamorphosed chromitites are controlled by interactions with metamorphic fluids involved in the formation of chlorite. © 2016 by Walter de Gruyter Berlin/Boston.

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Documento: Artículo
Título:Compositional effects on the solubility of minor and trace elements in oxide spinel minerals: Insights from crystal-crystal partition coefficients in chromite exsolution
Autor:Colás, V.; Padrón-Navarta, J.A.; González-Jiménez, J.M.; Griffin, W.L.; Fanlo, I.; O'Reilly, S.Y.; Gervilla, F.; Proenza, J.A.; Pearson, N.J.; Escayola, M.P.
Filiación:Instituto de Geologiá, Universidad Nacional Autónoma de México, Ciudad Universitaria, Ciudad de México, 04510, Mexico
Universidad de Zaragoza, Departamento de Ciencias de la Tierra, Pedro Cerbuna 12, Zaragoza, 50009, Spain
Geósciences Montpellier, CNRS, University of Montpellier, Montpellier, 34095, France
Department of Geology, Andean Geothermal Center of Excellence (CEGA), Universidad de Chile, Plaza Ercilla no. 803, Santiago, Chile
ARC Centre of Excellence for Core to Crust Fluid Systems (CCFS), GEMOC National Key Centre, Department of Earth and Planetary Sciences, Sydney, NSW 2109, Australia
Departamento de Mineralogiá y Petrologiá, Instituto Andaluz de Ciencias de la Tierra, Universidad de Granada, Avda. Fuentenueva s/n, Granada, 18002, Spain
Depar. de Cristallografia, Mineralogia i Dipòsits Minerals, Facultat de Geologia, Universitat de Barcelona, Martí i Franquès s/n, Barcelona, 08028, Spain
IDEAN-CONICET, Departamento de Ciencias Geológicas, Universidad de Buenos Aires, Intendente Guïraldes, Office 29, Buenos Aires, 1428, Argentina
Palabras clave:Chromite exsolution; hydrous metamorphism; minor and trace elements; partition coefficient; spinel-magnetite; chemical composition; chromite; crystal chemistry; exsolution; hydrous mineral; magnetite; metamorphism; partition coefficient; solubility; spinel; trace element; Andes; Argentina; Cordoba [Argentina]
Año:2016
Volumen:101
Número:6
Página de inicio:1360
Página de fin:1372
DOI: http://dx.doi.org/10.2138/am-2016-5611
Título revista:American Mineralogist
Título revista abreviado:Am. Mineral.
ISSN:0003004X
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_0003004X_v101_n6_p1360_Colas

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Citas:

---------- APA ----------
Colás, V., Padrón-Navarta, J.A., González-Jiménez, J.M., Griffin, W.L., Fanlo, I., O'Reilly, S.Y., Gervilla, F.,..., Escayola, M.P. (2016) . Compositional effects on the solubility of minor and trace elements in oxide spinel minerals: Insights from crystal-crystal partition coefficients in chromite exsolution. American Mineralogist, 101(6), 1360-1372.
http://dx.doi.org/10.2138/am-2016-5611
---------- CHICAGO ----------
Colás, V., Padrón-Navarta, J.A., González-Jiménez, J.M., Griffin, W.L., Fanlo, I., O'Reilly, S.Y., et al. "Compositional effects on the solubility of minor and trace elements in oxide spinel minerals: Insights from crystal-crystal partition coefficients in chromite exsolution" . American Mineralogist 101, no. 6 (2016) : 1360-1372.
http://dx.doi.org/10.2138/am-2016-5611
---------- MLA ----------
Colás, V., Padrón-Navarta, J.A., González-Jiménez, J.M., Griffin, W.L., Fanlo, I., O'Reilly, S.Y., et al. "Compositional effects on the solubility of minor and trace elements in oxide spinel minerals: Insights from crystal-crystal partition coefficients in chromite exsolution" . American Mineralogist, vol. 101, no. 6, 2016, pp. 1360-1372.
http://dx.doi.org/10.2138/am-2016-5611
---------- VANCOUVER ----------
Colás, V., Padrón-Navarta, J.A., González-Jiménez, J.M., Griffin, W.L., Fanlo, I., O'Reilly, S.Y., et al. Compositional effects on the solubility of minor and trace elements in oxide spinel minerals: Insights from crystal-crystal partition coefficients in chromite exsolution. Am. Mineral. 2016;101(6):1360-1372.
http://dx.doi.org/10.2138/am-2016-5611