Cr and Al diffusion in chromite spinel: experimental determination and its implication for diffusion creep

Suzuki, Atsuyuki; Yasuda, Akio; Ozawa, Kazuhito

doi:10.1007/s00269-008-0238-2

Cited by 65 publications

(66 citation statements)

References 24 publications

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“…In spinels Fe 2+ -Mg; Cr -Al; Fe 3+ -Cr, Al; Fe, Ti -Cr, Al cation substitutions take place (Ridley, 1977). In the FeAl2O4-MgAl2O4 system, intra-spinel and spinel-melt and spinelolivine Fe 2+ -Mg diffusion are very fast, whereas spinel-melt Al, Cr, Fe 3+ and Ti diffusion rates are slow (Wilson, 1982;Ozawa, 1984;Scowen et al, 1991;Allan, 1994;Roeder et al, 2001;Suzuki et al, 2008). Consequently sub-solidus reactions only allow Fe-Mg exchanges (O'Driscoll et al, 2010).…”

Section: Differentiationmentioning

confidence: 99%

Experimental petrology constraints on the recycling of mafic cumulate: a focus on Cr-spinel from the Rum Eastern Layered Intrusion, Scotland

Leuthold

Blundy

Brooker

2015

Contrib Mineral Petrol

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Section: Differentiationmentioning

confidence: 99%

Experimental petrology constraints on the recycling of mafic cumulate: a focus on Cr-spinel from the Rum Eastern Layered Intrusion, Scotland

Leuthold

Blundy

Brooker

2015

Contrib Mineral Petrol

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“…5) using the diffusion models of Ganguly et al (1994) and Be¤ jina et al (2009). The available data on Cr diffusion in magnesiochromite (Suzuki et al, 2008;and references therein) were used to estimate the cooling rate (s) from Cr concentration profiles using the following equation (Ganguly et al, 1994;Be¤ jina et al, 2009):…”

Section: Constraints On the Maqsad Chromitite Cooling Rate From Elemementioning

confidence: 99%

A New View on the Petrogenesis of the Oman Ophiolite Chromitites from Microanalyses of Chromite-hosted Inclusions

Borisova¹,

Ceuleneer²,

Kamenetsky³

et al. 2012

Journal of Petrology

109

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To decipher the petrogenesis of chromitites from the MohoTransition Zone of the Cretaceous Oman ophiolite, we carried out detailed scanning electron microscope and electron microprobe investigations of $500 silicate and chromite inclusions and their chromite hosts, and oxygen isotope measurements of seven chromite and olivine fractions from nodular, disseminated, and stratiform ore bodies and associated host dunites of the Maqsad area, Southern Oman. The results, coupled with laboratory homogenization experiments, allow several multiphase and microcrystal types of the chromite-hosted inclusions to be distinguished. The multiphase inclusions are composed of micron-size (1^50 mm) silicates (with rare sulphides) entrapped in high cr-number [100Cr/(Cr þAl) up to 80] chromite. The high cr-number chromite coronas and inclusions are reduced (oxygen fugacity, f O2 , of $3 log units below the quartz^fayalite^magnetite buffer, QFM). The reduced chromites, which crystallized between 600 and 9508C at subsolidus conditions, were overgrown by more oxidized host chromite (f O2 % QFM) in association with microcrystal inclusions of silicates (plagioclase An 86 , clinopyroxene, and pargasite) that were formed between 950 and 10508C at 200 MPa from a hydrous hybrid mid-ocean ridge basalt (MORB) melt. Chromium concentration profiles through the chromite coronas, inclusions, and host chromites indicate non-equilibrium fractional crystallization of the chromitite system at fast cooling rates (up to $0·18C a À1). Oxygen isotope compositions of the chromite grains imply involvement of a mantle protolith (e.g. serpentinite and serpentinized peridotite) altered by seawater-derived hydrothermal fluids in an oceanic setting. Our findings are consistent with a three-stage model of chromite formation involving (1) mantle protolith alteration by seawater-derived hydrothermal fluids yielding serpentinites and serpentinized harzburgites, which were probably the initial source of chromium, (2) subsolidus crystallization owing to prograde metamorphism, followed by (3) assimilation and fractional

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“…The diffusion parameters for these cations in spinel are, therefore, of considerable interest as they permit modeling of the observed compositional zonings to constrain the thermal history of the host rocks (e.g. Ozawa, 1984) and also analysis of diffusion controlled creep (Suzuki et al, 2008). In addition, Cr diffusion in spinel is of specific interest in the problem of 53 Mn-53 Cr cosmochronology of the early solar system objects (e.g.…”

Section: Introductionmentioning

confidence: 99%

“…Also the dependence of D(Cr) and T c (Cr) on the Cr# (i.e. Cr/(Cr + Al) ratio) has been accounted for using available D(Cr) vs. Cr# data in Suzuki et al (2008). We argue, on the basis of crystal chemical considerations and available diffusion kinetic data for minerals, that the T c for Mn should be much lower than that for Cr in spinel, olivine and orthopyroxene, and discuss the potential implications of the anticipated disparity between T c (Cr) and T c (Mn) for the estimation of the ( 53 Mn/ 55 Mn) o ratio from an internal isochron defined by these minerals.…”

mentioning

confidence: 99%

Diffusion kinetics of Cr in spinel: Experimental studies and implications for 53Mn–53Cr cosmochronology

Posner

Ganguly

Hervig

2016

Geochimica et Cosmochimica Acta

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The 53 Mn-53 Cr decay system, in which 53 Mn decays to 53 Cr (t 1/2 = 3.7 Ma) has been widely used to construct 53 Cr/ 52 Cr vs. 55 Mn/ 52 Cr isochrons and thus determine relative ages of early solar system objects or events, assuming that the initial Cr isotopic ratio, ( 53 Cr/ 52 Cr) o , equals ( 53 Mn/ 52 Cr) o . With the primary objective of interpretation of these ages within a diffusion kinetic framework, we have determined the tracer diffusion coefficient of Cr in natural spinels, which are very close to the MgAl 2 O 4 end-member composition, as a function of temperature and oxygen fugacity (f(O 2 )). It is found that the diffusion coefficient of Cr, D(Cr), in two stocks of spinels (referred to as cut-gems and gem-gravels) with very similar major element chemistry is consistently different, but the data in each stock yield well defined Arrhenius relations that show a difference of log D of 0.6-1.0, depending on temperature, with the D(Cr) in gem-gravel being higher than that in the cut-gem stock. The D(Cr) was found to have a positive dependence on f(O 2 ) in the range of f(O 2 ) of around ±2 log units relative to that of the wü stite-magnetite buffer. The difference in the D(Cr) between the two stocks and the observed D(Cr) vs. f(O 2 ) relation has been explained in terms of a change of point defect concentration resulting from heterovalent substitution of trace elements and equilibration with the imposed f(O 2 ) conditions, respectively. Assuming a homogeneous semi-infinite matrix, the closure temperature (T c ) of Cr diffusion in spinel has been calculated as a function of grain size, cooling rate, peak temperature (T o ) and f(O 2 ). Also the dependence of D(Cr) and T c (Cr) on the Cr# (i.e. Cr/(Cr + Al) ratio) has been accounted for using available D(Cr) vs. Cr# data in Suzuki et al. (2008). We argue, on the basis of crystal chemical considerations and available diffusion kinetic data for minerals, that the T c for Mn should be much lower than that for Cr in spinel, olivine and orthopyroxene, and discuss the potential implications of the anticipated disparity between T c (Cr) and T c (Mn) for the estimation of the ( 53 Mn/ 55 Mn) o ratio from an internal isochron defined by these minerals. Finally, we discuss the problem of determining the T c for an internal isochron in relation to the individual T c (Cr) for spinel, olivine and orthopyroxene.

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Cr and Al diffusion in chromite spinel: experimental determination and its implication for diffusion creep

Cited by 65 publications

References 24 publications

Experimental petrology constraints on the recycling of mafic cumulate: a focus on Cr-spinel from the Rum Eastern Layered Intrusion, Scotland

Experimental petrology constraints on the recycling of mafic cumulate: a focus on Cr-spinel from the Rum Eastern Layered Intrusion, Scotland

A New View on the Petrogenesis of the Oman Ophiolite Chromitites from Microanalyses of Chromite-hosted Inclusions

Diffusion kinetics of Cr in spinel: Experimental studies and implications for 53Mn–53Cr cosmochronology

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