Cations in olivine, Part 2: Diffusion in olivine xenocrysts, with applications to petrology and mineral physics

Jurewicz, A. J. G.; Watson, E. Bruce

doi:10.1007/bf00371460

Cited by 179 publications

(84 citation statements)

References 16 publications

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“…The Mn-Cr ages of pallasites were obtained from olivine. According to the diffusion coefficients in olivine (Jurewicz and Watson 1988) the closure temperature is ~900°K, not much different from the closure temperature of sarcopside. Therefore, it is expected that age differences between IIIAB and pallasites measured by the Mn-Cr system and by the Pd-Ag system are similar.…”

Section: Comparison With Other Chronometersmentioning

confidence: 89%

Mn‐Cr chronology of five IIIAB iron meteorites

Sugiura

Hoshino

2003

Meteorit & Planetary Scien

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Apparently, old Mn-Cr ages reported in previous studies can also be explained in a similar way. Therefore, the IIIAB iron meteorites probably experienced identical thermal histories and thus derived from the core of a parent body. Thermal histories of the parent body of IIIAB iron meteorites that satisfy the Mn-Cr chronology and metallographic cooling rates were constructed by computer simulation. The thermal history at an early stage (<10 Ma after CAI formation) is well determined, though later history may be more model-dependent. It is suggested that relative timing of various events in the IIIAB parent body may be estimated with the aid of the thermal history. There is a systematic difference in Mn and Cr concentrations in various minerals (phosphates, sulfide, etc.) among the IIIAB iron meteorites, which seems to be mainly controlled by redox conditions.

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Section: Comparison With Other Chronometersmentioning

confidence: 89%

Mn‐Cr chronology of five IIIAB iron meteorites

Sugiura

Hoshino

2003

Meteorit & Planetary Scien

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“…The asymmetrical zonation (Figure 3i-k) is interpreted to be caused by various degrees of elemental exchange with different silicate minerals, which are also characterized by variable degrees of solubility and different capacities to accommodate elements [22,[77][78][79]. Thus, tschermakite, phlogopite, and enstatite with higher contents of Al and high Cr-bearing capacity impose greater influence on spinel than olivine, which only contains limited concentrations of Cr [72,80,81] and Al [82,83]), and acts as a relatively perfect barrier to elemental diffusion [84]. In addition, the characteristic of large Cr-spinel grains preserving well-developed zonation (Figure 3m-p) suggests that the relatively small grains are completely controlled or equilibrated by the surrounding silicate minerals, thereby destroying the zoned texture [85].…”

Section: Elemental Exchange With Coexisting Silicate Mineralsmentioning

confidence: 99%

Origin of Reverse Zoned Cr-Spinels from the Paleoproterozoic Yanmenguan Mafic–Ultramafic Complex in the North China Craton

Bai

Xiao

et al. 2018

Minerals

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Abstract:We conducted petrological and mineral chemistry investigations of Cr-spinel in ultramafic rocks of the Yanmenguan mafic-ultramafic complex in the North China Craton. The Cr-spinel grains occur as inclusions in enstatite, tschermakite, phlogopite, and olivine, or as interstitial grains among the aforementioned silicate minerals, and show concentric or asymmetrical textures. Back-scattered electron and elemental images and compositional profiles of the spinel grains indicate the presence of Cr-and Fe-rich cores and Al-and Mg-rich rims. The host silicate minerals display a decrease in Al and Mg contents accompanied by an increase in Cr and Fe away from the spinel. These textures and compositional variations suggest that subsolidus elemental exchange more likely gave rise to the compositional zonation, resulting in the transfer of Al and Mg from the silicate minerals to the spinel. The Mn, Ni, and Ti contents in spinel and the major elements of olivine-hosted spinel are relatively stable during subsolidus elemental diffusion and thus are more reliable tracers of primary high-temperature processes. The temperature estimates reveal that the subsolidus diffusion might have occurred at 600-720 • C, which could be linked to the regional metamorphic event.

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“…It is well known that D Mg-Fe of olivine varies with temperature, composition (Fo), crystallographic direction, and oxygen fugacity and to a lesser extent with pressure [e.g., Buening and Buseck, 1973;Misener, 1974;Jurewicz and Watson, 1988;Bertran-Alvarez et al, 1992;Chakraborty, 1997;Farber et al, 2000] [Chakraborty, 1997]. We have examined the published data and found that the D Mg-Fe of Chakraborty [1997] are in general agreement with those of Miyamoto and Mikouchi [1998], Jones [1994], and Jurewicz and Watson [1988]. We cannot reproduce the original diffusion profiles of Buening and Buseck [1973] and Misener [1974] using their retrieved diffusion coefficients.…”

Section: Diffusion Calculationmentioning

confidence: 99%

Mid‐ocean ridge magma chamber processes: Constraints from olivine zonation in lavas from the East Pacific Rise at 9°30′N and 10°30′N

Pan

Batiza

2002

J. Geophys. Res.

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[1] Lavas from the northern East Pacific Rise with both robust (9°30 0 N) and nonrobust (10°30 0 N) ridge morphologies have compositionally diverse populations of plagioclase and/or olivine due to magma mixing. We interpret zoning in olivines to be primarily due to diffusion after mixing events, which allows us to calculate the residence times of individual crystals in the magma. For the four studied samples, olivine populations exhibit exponential distributions of calculated diffusion times, with short times exponentially more abundant than longer times. We model this distribution as resulting from mixing in an open-system axial magma chamber. Magma residence times in axial chambers at East Pacific Rise 9°30 0 N and 10°30 0 N for the four studied samples are of the order of months. Surprisingly, we find that the differences in mineralogy and magma residence times between robust and nonrobust East Pacific Rise segments are not significant. Taken together, our observations and measurements suggest that the seismically imaged melt lens of the axial magma chamber does not play a significant role in controlling the crystal content and characters of erupted lavas.

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Cations in olivine, Part 2: Diffusion in olivine xenocrysts, with applications to petrology and mineral physics

Cited by 179 publications

References 16 publications

Mn‐Cr chronology of five IIIAB iron meteorites

Mn‐Cr chronology of five IIIAB iron meteorites

Origin of Reverse Zoned Cr-Spinels from the Paleoproterozoic Yanmenguan Mafic–Ultramafic Complex in the North China Craton

Mid‐ocean ridge magma chamber processes: Constraints from olivine zonation in lavas from the East Pacific Rise at 9°30′N and 10°30′N

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