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Published online on October 12, 2004, 10.1073/pnas.0405048101
PNAS | October 19, 2004 | vol. 101 | no. 42 | 15033-15037


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GEOLOGY
Ringwoodite lamellae in olivine: Clues to olivine–ringwoodite phase transition mechanisms in shocked meteorites and subducting slabs

Ming Chen *, {dagger}, Ahmed El Goresy {ddagger}, and Philippe Gillet §

*Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510640, China; {ddagger}Max-Planck-Institut für Chemie, 55128 Mainz, Germany; and §Laboratoire des Sciences de la Terre, Centre National de la Recherche Scientifique, Unité Mixte de Recherche 5570, Ecole Normale Supérieure de Lyon, 46 Allée d'Italie, 69364 Lyon Cedex 7, France

Edited by Ho-kwang Mao, Carnegie Institution of Washington, Washington, DC, and approved September 15, 2004 (received for review July 12, 2004)

The first natural occurrence of ringwoodite lamellae was found in the olivine grains inside and in areas adjacent to the shock veins of a chondritic meteorite, and these lamellae show distinct growth mechanism. Inside the veins where pressure and temperature were higher than elsewhere, ringwoodite lamellae formed parallel to the {101} planes of olivine, whereas outside they lie parallel to the (100) plane of olivine. The lamellae replaced the host olivine from a few percent to complete. Formation of these lamellae relates to a diffusion-controlled growth of ringwoodite along shear-induced planar defects in olivine. The planar defects and ringwoodite lamellae parallel to the {101} planes of olivine should have been produced in higher shear stress and temperature region than that parallel to the (100) plane of olivine. This study suggests that the time duration of high pressure and temperature for the growth of ringwoodite lamellae might have lasted at least for several seconds, and that an intracrystalline transformation mechanism of ringwoodite in olivine could favorably operate in the subducting lithospheric slabs in the deep Earth.

This paper was submitted directly (Track II) to the PNAS office.

Abbreviation: BSE, back-scattered electron.

{dagger} To whom correspondence should be addressed. E-mail: mchen{at}gig.ac.cn.

© 2004 by The National Academy of Sciences of the USA


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A. Zhang, W. Hsu, R. Wang, and M. Ding
Pyroxene polymorphs in melt veins of the heavily shocked Sixiangkou L6 chondrite
European Journal of Mineralogy, December 1, 2006; 18(6): 719 - 726.
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