Os-isotope variability within sulfides from podiform chromitites

José M. González-Jiménez; Fernando Gervilla; William L. Griffin; Joaquín A. Proenza; Thierry Augé; Suzanne Y. O'Reilly; Norman J. Pearson

doi:10.1016/j.chemgeo.2011.10.016

Os-isotope variability within sulfides from podiform chromitites

José M. González-Jiménez^*, Fernando Gervilla, William L. Griffin, Joaquín A. Proenza, Thierry Augé, Suzanne Y. O'Reilly, Norman J. Pearson

^*Corresponding author for this work

ARC Centre of Excellence for Core to Crust Fluid Systems (incorporation ARC National Key Centre for Geochemical evolution and Metallogeny of Continents (GEMOC))

Research output: Contribution to journal › Article › peer-review

42 Citations (Scopus)

Abstract

In situ laser ablation MC-ICPMS was used to measure the Os-isotope compositions of single sulfide grains (≥ 5 μm in diameter) included in unaltered primary chromite from the podiform chromitite of Caridad (eastern Cuba). The analyzed phases include PGE-sulfides (laurite and PGE-rich monosulfide solid solution) and base-metal sulfides (BM-sulfides; millerite, heazlewoodite and pentlandite). The results show that PGE-sulfides and the BM-sulfides have distinctly different Os-isotope compositions. Significant variations in Os-isotope composition are found among sulfide grains forming parts of single composite aggregates smaller than 50 μm in diameter. A similar degree of heterogeneity was observed in some chemically and isotopically zoned sulfide grains. At such small scales, the formation of sulfides with variable Os-isotope signatures requires a heterogeneous genetic process in which individual pulses of isotopically and chemically different melts coexisted in space and/or time. This could be achieved if the podiform chromitites formed as a result of mantle-melt reactions and the subsequent melt mixing/mingling of several batches of melt.

Original language	English
Pages (from-to)	224-235
Number of pages	12
Journal	Chemical Geology
Volume	291
DOIs	https://doi.org/10.1016/j.chemgeo.2011.10.016
Publication status	Published - 6 Jan 2012

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title = "Os-isotope variability within sulfides from podiform chromitites",

abstract = "In situ laser ablation MC-ICPMS was used to measure the Os-isotope compositions of single sulfide grains (≥ 5 μm in diameter) included in unaltered primary chromite from the podiform chromitite of Caridad (eastern Cuba). The analyzed phases include PGE-sulfides (laurite and PGE-rich monosulfide solid solution) and base-metal sulfides (BM-sulfides; millerite, heazlewoodite and pentlandite). The results show that PGE-sulfides and the BM-sulfides have distinctly different Os-isotope compositions. Significant variations in Os-isotope composition are found among sulfide grains forming parts of single composite aggregates smaller than 50 μm in diameter. A similar degree of heterogeneity was observed in some chemically and isotopically zoned sulfide grains. At such small scales, the formation of sulfides with variable Os-isotope signatures requires a heterogeneous genetic process in which individual pulses of isotopically and chemically different melts coexisted in space and/or time. This could be achieved if the podiform chromitites formed as a result of mantle-melt reactions and the subsequent melt mixing/mingling of several batches of melt.",

author = "Gonz{\'a}lez-Jim{\'e}nez, {Jos{\'e} M.} and Fernando Gervilla and Griffin, {William L.} and Proenza, {Joaqu{\'i}n A.} and Thierry Aug{\'e} and O'Reilly, {Suzanne Y.} and Pearson, {Norman J.}",

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doi = "10.1016/j.chemgeo.2011.10.016",

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AU - González-Jiménez, José M.

AU - Gervilla, Fernando

AU - Griffin, William L.

AU - Proenza, Joaquín A.

AU - Augé, Thierry

AU - O'Reilly, Suzanne Y.

AU - Pearson, Norman J.

PY - 2012/1/6

Y1 - 2012/1/6

N2 - In situ laser ablation MC-ICPMS was used to measure the Os-isotope compositions of single sulfide grains (≥ 5 μm in diameter) included in unaltered primary chromite from the podiform chromitite of Caridad (eastern Cuba). The analyzed phases include PGE-sulfides (laurite and PGE-rich monosulfide solid solution) and base-metal sulfides (BM-sulfides; millerite, heazlewoodite and pentlandite). The results show that PGE-sulfides and the BM-sulfides have distinctly different Os-isotope compositions. Significant variations in Os-isotope composition are found among sulfide grains forming parts of single composite aggregates smaller than 50 μm in diameter. A similar degree of heterogeneity was observed in some chemically and isotopically zoned sulfide grains. At such small scales, the formation of sulfides with variable Os-isotope signatures requires a heterogeneous genetic process in which individual pulses of isotopically and chemically different melts coexisted in space and/or time. This could be achieved if the podiform chromitites formed as a result of mantle-melt reactions and the subsequent melt mixing/mingling of several batches of melt.

AB - In situ laser ablation MC-ICPMS was used to measure the Os-isotope compositions of single sulfide grains (≥ 5 μm in diameter) included in unaltered primary chromite from the podiform chromitite of Caridad (eastern Cuba). The analyzed phases include PGE-sulfides (laurite and PGE-rich monosulfide solid solution) and base-metal sulfides (BM-sulfides; millerite, heazlewoodite and pentlandite). The results show that PGE-sulfides and the BM-sulfides have distinctly different Os-isotope compositions. Significant variations in Os-isotope composition are found among sulfide grains forming parts of single composite aggregates smaller than 50 μm in diameter. A similar degree of heterogeneity was observed in some chemically and isotopically zoned sulfide grains. At such small scales, the formation of sulfides with variable Os-isotope signatures requires a heterogeneous genetic process in which individual pulses of isotopically and chemically different melts coexisted in space and/or time. This could be achieved if the podiform chromitites formed as a result of mantle-melt reactions and the subsequent melt mixing/mingling of several batches of melt.

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DO - 10.1016/j.chemgeo.2011.10.016

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SN - 0009-2541

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JO - Chemical Geology

JF - Chemical Geology

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Os-isotope variability within sulfides from podiform chromitites

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