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dc.contributor.author
Colas, Vanesa
dc.contributor.author
Padrón Navarta, José Alberto
dc.contributor.author
González Gimenez, José María
dc.contributor.author
Griffin, William L.
dc.contributor.author
Fanlo González, Isabel
dc.contributor.author
O'Reilly, Suzanne Y.
dc.contributor.author
Gervilla, Fernando
dc.contributor.author
Proenza, Joaquín A.
dc.contributor.author
Pearson, Norman J.
dc.contributor.author
Escayola, Monica Patricia
dc.date.available
2017-12-26T13:46:26Z
dc.date.issued
2016-03
dc.identifier.citation
Escayola, Monica Patricia; Pearson, Norman J.; Proenza, Joaquín A.; Gervilla, Fernando; O'Reilly, Suzanne Y.; Fanlo González, Isabel; 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; Mineralogical Society of America; American Mineralogist; 101; 6; 3-2016; 1360-1372
dc.identifier.issn
0003-004X
dc.identifier.uri
http://hdl.handle.net/11336/31484
dc.description.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+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). 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 values span more than an order of magnitude, from DTiSpl/Mag = 0.30 ± 0.06 to DZnSpl/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-Al2Fe3+?2 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.
dc.format
application/pdf
dc.language.iso
eng
dc.publisher
Mineralogical Society of America
dc.rights
info:eu-repo/semantics/restrictedAccess
dc.rights.uri
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
dc.subject
Chromite Exsolution
dc.subject
Partition Coefficient
dc.subject
Minor And Trace Elements
dc.subject
Hydrous Metamorphism
dc.subject.classification
Otras Ciencias Naturales y Exactas
dc.subject.classification
Otras Ciencias Naturales y Exactas
dc.subject.classification
CIENCIAS NATURALES Y EXACTAS
dc.title
Compositional effects on the solubility of minor and trace elements in oxide spinel minerals: Insights from crystal-crystal partition coefficients in chromite exsolution
dc.type
info:eu-repo/semantics/article
dc.type
info:ar-repo/semantics/artículo
dc.type
info:eu-repo/semantics/publishedVersion
dc.date.updated
2017-07-13T18:16:20Z
dc.journal.volume
101
dc.journal.number
6
dc.journal.pagination
1360-1372
dc.journal.pais
Estados Unidos
dc.journal.ciudad
Chantilly
dc.description.fil
Fil: Colas, Vanesa. Universidad Nacional Autonoma de Mexico. Instituto de Geología; México. Universidad de Zaragoza; España
dc.description.fil
Fil: Padrón Navarta, José Alberto. University of Montpellier; Francia
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Fil: González Gimenez, José María. Universidad de Chile; Chile
dc.description.fil
Fil: Griffin, William L.. Macquarie University; Australia
dc.description.fil
Fil: Fanlo González, Isabel. Universidad de Zaragoza; España
dc.description.fil
Fil: O'Reilly, Suzanne Y.. Macquarie University; Australia
dc.description.fil
Fil: Gervilla, Fernando. Universidad de Granada; España
dc.description.fil
Fil: Proenza, Joaquín A.. Universidad de Barcelona; España
dc.description.fil
Fil: Pearson, Norman J.. Macquarie University; Australia
dc.description.fil
Fil: Escayola, Monica Patricia. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria. Instituto de Estudios Andinos "Don Pablo Groeber". Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Instituto de Estudios Andinos "Don Pablo Groeber"; Argentina
dc.journal.title
American Mineralogist
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/url/http://www.minsocam.org/msa/ammin/toc/2016/index.html?issue_number=06
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