Evidence for fractional crystallization of wadsleyite and ringwoodite from olivine melts in chondrules entrained in shock-melt veins

Peace River is one of the few shocked members of the L-chondrites clan that contains both high-pressure polymorphs of olivine, ringwoodite and wadsleyite, in diverse textures and settings in fragments entrained in shock-melt veins. Among these settings are complete olivine porphyritic chondrules. We...

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Veröffentlicht in:Proceedings of the National Academy of Sciences - PNAS 2008-06, Vol.105 (25), p.8542-8547
Hauptverfasser: Miyahara, Masaaki, El Goresy, Ahmed, Ohtani, Eiji, Nagase, Toshiro, Nishijima, Masahiko, Vashaei, Zahra, Ferroir, Tristan, Gillet, Philippe, Dubrovinsky, Leonid, Simionovici, Alexandre
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container_title Proceedings of the National Academy of Sciences - PNAS
container_volume 105
creator Miyahara, Masaaki
El Goresy, Ahmed
Ohtani, Eiji
Nagase, Toshiro
Nishijima, Masahiko
Vashaei, Zahra
Ferroir, Tristan
Gillet, Philippe
Dubrovinsky, Leonid
Simionovici, Alexandre
description Peace River is one of the few shocked members of the L-chondrites clan that contains both high-pressure polymorphs of olivine, ringwoodite and wadsleyite, in diverse textures and settings in fragments entrained in shock-melt veins. Among these settings are complete olivine porphyritic chondrules. We encountered few squeezed and flattened olivine porphyritic chondrules entrained in shock-melt veins of this meteorite with novel textures and composition. The former chemically unzoned (Fa₂₄₋₂₆) olivine porphyritic crystals are heavily flattened and display a concentric intergrowth with Mg-rich wadsleyite of a very narrow compositional range (Fa₆-Fa₁₀) in the core. Wadsleyite core is surrounded by a Mg-poor and chemically stark zoned ringwoodite (Fa₂₈-Fa₃₈) belt. The wadsleyite-ringwoodite interface denotes a compositional gap of up to 32 mol % fayalite. A transmission electron microscopy study of focused ion beam slices in both regions indicates that the wadsleyite core and ringwoodite belt consist of granoblastic-like intergrowth of polygonal crystallites of both ringwoodite and wadsleyite, with wadsleyite crystallites dominating in the core and ringwoodite crystallites dominating in the belt. Texture and compositions of both high-pressure polymorphs are strongly suggestive of formation by a fractional crystallization of the olivine melt of a narrow composition (Fa₂₄₋₂₆), starting with Mg-rich wadsleyite followed by the Mg-poor ringwoodite from a shock-induced melt of olivine composition (Fa₂₄₋₂₆). Our findings could erase the possibility of the resulting unrealistic time scales of the high-pressure regime reported recently from other shocked L-6 chondrites.
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Among these settings are complete olivine porphyritic chondrules. We encountered few squeezed and flattened olivine porphyritic chondrules entrained in shock-melt veins of this meteorite with novel textures and composition. The former chemically unzoned (Fa₂₄₋₂₆) olivine porphyritic crystals are heavily flattened and display a concentric intergrowth with Mg-rich wadsleyite of a very narrow compositional range (Fa₆-Fa₁₀) in the core. Wadsleyite core is surrounded by a Mg-poor and chemically stark zoned ringwoodite (Fa₂₈-Fa₃₈) belt. The wadsleyite-ringwoodite interface denotes a compositional gap of up to 32 mol % fayalite. A transmission electron microscopy study of focused ion beam slices in both regions indicates that the wadsleyite core and ringwoodite belt consist of granoblastic-like intergrowth of polygonal crystallites of both ringwoodite and wadsleyite, with wadsleyite crystallites dominating in the core and ringwoodite crystallites dominating in the belt. 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subjects Chemical composition
Chondrites
Chondrules
Crystallites
Crystallization
Crystals
Earth
Earth Sciences
Ions
Melting
Minerals
Olivine
Physical Sciences
Polymorphism
Pyroxenes
Sciences of the Universe
Transmission electron microscopy
title Evidence for fractional crystallization of wadsleyite and ringwoodite from olivine melts in chondrules entrained in shock-melt veins
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