High pressure minerals in the Château-Renard (L6) ordinary chondrite

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Marco E. Ciriotti
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Iscritto il: ven 25 giu, 2004 11:31
Località: via San Pietro, 55 I-10073 Devesi/Cirié TO - Italy

High pressure minerals in the Château-Renard (L6) ordinary chondrite

Messaggio da Marco E. Ciriotti » gio 02 ago, 2018 11:50

▪ Baziotis, I., Asimow, P.D., Hu, J., Ferriere, L., Ma, C., Cernok, A., Anand, M., Topa, D. (2018): High pressure minerals in the Château-Renard (L6) ordinary chondrite: implications for collisions on its parent body. Scientific Reports, 8, 9851; DOI:10.1038/s41598-018-28191-6.

We report the first discoveries of high-pressure minerals in the historical L6 chondrite fall Château-Renard, based on co-located Raman spectroscopy, scanning electron microscopy (SEM) with energydispersive X-ray spectroscopy and electron backscatter diffraction, electron microprobe analysis, and
transmission electron microscopy (TEM) with selected-area electron diffraction. A single polished section contains a network of melt veins from ~40 to ~200 μm wide, with no cross-cutting features requiring multiple vein generations. We find high-pressure minerals in veins greater than ~50 μm wide, including assemblages of ringwoodite + wadsleyite, ringwoodite + wadsleyite + majorite-pyropess, and ahrensite + wadsleyite. In association with ahrensite + wadsleyite at both SEM and TEM scale, we find a sodic pyroxene whose Raman spectrum is indistinguishable from that of jadeite but whose composition and structure are those of omphacite. We discuss constraints on the impact record of this meteorite and the L-chondrites in general.
Marco E. Ciriotti

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