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Geology; August 2001; v. 29; no. 8; p. 667-670; DOI: 10.1130/0091-7613(2001)029<0667:ERIFSL>2.0.CO;2
© 2001 Geological Society of America
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Eclogite rheology: Implications for subducted lithosphere

Z.-M. Jin1, J. Zhang1, H.W. Green, II1 and S. Jin2

1 Institute of Geophysics and Planetary Physics and Department of Earth Sciences, University of California, Riverside, California 92521, USA, and Faculty of Earth Sciences, China University of Geosciences, Wuhan, 430074, China
2 Faculty of Earth Sciences, China University of Geosciences, Wuhan, 430074, China

Eclogite, the high-pressure equivalent of basalt, is common in ultrahigh-pressure metamorphic terranes and constitutes the oceanic crust after it is subducted into the mantle. We present here first measurements of the rheology of eclogite and its constituent minerals, garnet and omphacite. Eclogite with approximately equal amounts of these two minerals has the same strength as harzburgite, whereas pure omphacite is much weaker and pure garnetite is much stronger. The strength variation of different mixtures of the two phases is quantitatively consistent with theoretical predictions for a two-phase material. The strengthening effect of garnet should increase the viscosity of the lower part of the mantle transition zone, but it probably is not sufficient to allow delamination of the oceanic crust from the underlying mantle during subduction.

Key Words: eclogite • rheology • subduction • garnet • omphacite




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