Fast grain growth of olivine in liquid Fe–S and the formation of pallasites with rounded olivine grains

Solferino, Giulio; Golabek, Gregor J.; Nimmo, F.; Schmidt, Max W.

doi:10.1016/j.gca.2015.04.020

Cited by 15 publications

(34 citation statements)

References 65 publications

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“…; Solferino et al. ). In the presence of substantial sulfide melt, the rounding of olivine on a macroscale is possible over timescales on the order of a few hundred thousand years (Solferino et al.…”

Section: Discussionmentioning

confidence: 97%

“…In the presence of substantial sulfide melt, the rounding of olivine on a macroscale is possible over timescales on the order of a few hundred thousand years (Solferino et al. ). Along with the occasional occurrence of more than one textural type of olivine in a single pallasite (e.g., Boesenberg et al.…”

Section: Discussionmentioning

confidence: 99%

“…According to Solferino et al. (), it seems that the main control is whether any particular olivine grain was exposed to melt or shared a boundary with other olivine grains. In the former case, olivine would develop conspicuous rounded surfaces where they were exposed to metallic liquid, while in the latter case, they would grow into dense dunitic masses (Scott 1977b).…”

Section: Discussionmentioning

confidence: 99%

“…Recently, experimental work (Solferino et al. ) and new petrographic observations (Scott ) have indicated that the morphology of pallasite olivine, that is, the macroscale textures and grain size, was controlled by the presence of and their residence time in an Fe‐S liquid. Fragmental olivines are therefore likely to have formed from relatively large (~5–15 mm) rounded or angular precursors, which are the most common morphological type observed in pallasites (Scott 1977b).…”

Section: Introductionmentioning

confidence: 99%

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Petrogenesis of main group pallasite meteorites based on relationships among texture, mineralogy, and geochemistry

McKibbin

Pittarello

Makarona

et al. 2019

Meteorit & Planetary Scien

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Main group pallasite meteorites are samples of a single early magmatic planetesimal, dominated by metal and olivine but containing accessory chromite, sulfide, phosphide, phosphates, and rare phosphoran olivine. They represent mixtures of core and mantle materials, but the environment of formation is poorly understood, with a quiescent core–mantle boundary, violent core–mantle mixture, or surface mixture all recently suggested. Here, we review main group pallasite data sets and petrologic characteristics, and present new observations on the low‐MnO pallasite Brahin that contains abundant fragmental olivine, but also rounded and angular olivine and potential evidence of sulfide–phosphide liquid immiscibility. A reassessment of the literature shows that low‐MnO and high‐FeO subgroups preferentially host rounded olivine and low‐temperature P2O5‐rich phases such as the Mg‐phosphate farringtonite and phosphoran olivine. These phases form after metal and silicate reservoirs back‐react during decreasing temperature after initial separation, resulting in oxidation of phosphorus and chromium. Farringtonite and phosphoran olivine have not been found in the common subgroup PMG, which are mechanical mixtures of olivine, chromite with moderate Al2O3 contents, primitive solid metal, and evolved liquid metal. Lower concentrations of Mn in olivine of the low‐MnO PMG subgroup, and high concentrations of Mn in low‐Al2O3 chromites, trace the development and escape of sulfide‐rich melt in pallasites and the partially chalcophile behavior for Mn in this environment. Pallasites with rounded olivine indicate that the core–mantle boundary of their planetesimal may not be a simple interface but rather a volume in which interactions between metal, silicate, and other components occur.

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Section: Discussionmentioning

confidence: 97%

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Petrogenesis of main group pallasite meteorites based on relationships among texture, mineralogy, and geochemistry

McKibbin

Pittarello

Makarona

et al. 2019

Meteorit & Planetary Scien

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show abstract

“…Different formation scenarios are invoked for pallasites: these meteorites either sample the mantle core boundary of a differentiated body and result from magmatic processes (e.g. Wasson and Choi, 2003;McKibbin et al, 2016 and references therein), or they formed by impacts between already differentiated planetesimals (Scott, 2007;Solferino et al, 2015;Solferino and Golabek, 2018). Nickel and Fe isotopes data can be discussed relative to these different processes.…”

Section: Application To Natural Samplesmentioning

confidence: 99%

Nickel isotope fractionation during metal-silicate differentiation of planetesimals: Experimental petrology and ab initio calculations

Guignard

Quitté

Méheut

et al. 2020

Geochimica et Cosmochimica Acta

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Olivine grain growth in partially molten Fe–Ni–S: A proxy for the genesis of pallasite meteorites

Solferino

Golabek

2018

Earth and Planetary Science Letters

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Fast grain growth of olivine in liquid Fe–S and the formation of pallasites with rounded olivine grains

Cited by 15 publications

References 65 publications

Petrogenesis of main group pallasite meteorites based on relationships among texture, mineralogy, and geochemistry

Petrogenesis of main group pallasite meteorites based on relationships among texture, mineralogy, and geochemistry

Nickel isotope fractionation during metal-silicate differentiation of planetesimals: Experimental petrology and ab initio calculations

Olivine grain growth in partially molten Fe–Ni–S: A proxy for the genesis of pallasite meteorites

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