%0 Journal Article %T Diffusion Creep of Diopside %+ Institut des Sciences de la Terre d'Orléans - UMR7327 (ISTO) %+ Géodynamique - UMR7327 %+ The University of Tokyo (UTokyo) %A Ghosh, Subhajit %A Koizumi, S. %A Hiraga, T. %< avec comité de lecture %@ 2169-9313 %J Journal of Geophysical Research : Solid Earth %I American Geophysical Union %V 126 %N 1 %P e2020JB019855 %8 2021-01 %D 2021 %R 10.1029/2020JB019855 %Z Sciences of the Universe [physics]Journal articles %X We have conducted uniaxial compression experiments on fine-grained diopside with either 4 or 10 vol% forsterite and 10 vol% anorthite. We changed the average grain size in the diopside with forsterite aggregate from 0.43 to 4.07µm to reveal the grain size sensitivity of the creep rate. Mechanical data were obtained at a stepped load for a temperature range of 1050°C–1170°C. The observed strain rates are best explained by stress and grain size exponent values of 1 and 2, respectively, and activation energy of 720kJ/mol, which indicates lattice diffusion creep. Anorthite bearing aggregate is 3 times weaker than forsterite-bearing aggregate, probably due to the presence of aluminum. We have compared previously reported diffusion creep rates of diopside in nondimensional stress and strain-rate space, constructed based on our diffusion creep law. It demonstrates that all the earlier mechanical data are well summarized by our diffusion creep flow law %G English %2 https://insu.hal.science/insu-03186366/document %2 https://insu.hal.science/insu-03186366/file/2020JB019855.pdf %L insu-03186366 %U https://insu.hal.science/insu-03186366 %~ OBSPM %~ INSU %~ BRGM %~ CNRS %~ UNIV-ORLEANS %~ ISTO %~ OSUC %~ PSL %~ TEST-HALCNRS %~ OBSPM-PSL