NDLI: Textures in deforming forsterite aggregates up to 8 GPa and 1673 K

Content Provider	Springer Nature Link
Author	Bollinger, Caroline Raterron, Paul Castelnau, Olivier Detrez, Fabrice Merkel, Sébastien
Copyright Year	2016
Abstract	We report results from axisymmetric deformation experiments carried out on forsterite aggregates in the deformation-DIA apparatus, at upper mantle pressures and temperatures (3.1–8.1 GPa, 1373–1673 K). We quantified the resulting lattice preferred orientations (LPO) and compare experimental observations with results from micromechanical modeling (viscoplastic second-order self-consistent model—SO). Up to 6 GPa (~185-km depth in the Earth), we observe a marked LPO consistent with a dominant slip in the (010) plane with one observation of a dominant [100] direction, suggesting that [100](010) slip system was strongly activated. At higher pressures (deeper depth), the LPO becomes less marked and more complex with no evidence of a dominant slip system, which we attribute to the activation of several concurrent slip systems. These results are consistent with the pressure-induced transition in the dominant slip system previously reported for olivine and forsterite. They are also consistent with the decrease in the seismic anisotropy amplitude observed in the Earth’s mantle at depth greater than ~200 km.
Starting Page	409
Ending Page	417
Page Count	9
File Format	PDF
ISSN	03421791
Journal	Physics and Chemistry of Minerals
Volume Number	43
Issue Number	6
e-ISSN	14322021
Language	English
Publisher	Springer Berlin Heidelberg
Publisher Date	2016-03-18
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Forsterite Deformation High pressure D-DIA Lattice preferred orientation Micromechanical modeling Mineralogy Crystallography Geochemistry Mineral Resources
Content Type	Text
Resource Type	Article
Subject	Geochemistry and Petrology Materials Science

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