Deformation Behavior of Wet and Dry Clinopyroxenite in the Brittle to Ductile Transition Region

  1. B.E. Hobbs and
  2. H.C. Heard
  1. J. N. Boland and
  2. T. E. Tullis

Published Online: 18 MAR 2013

DOI: 10.1029/GM036p0035

Mineral and Rock Deformation: Laboratory Studies: The Paterson Volume

Mineral and Rock Deformation: Laboratory Studies: The Paterson Volume

How to Cite

Boland, J. N. and Tullis, T. E. (1986) Deformation Behavior of Wet and Dry Clinopyroxenite in the Brittle to Ductile Transition Region, in Mineral and Rock Deformation: Laboratory Studies: The Paterson Volume (eds B.E. Hobbs and H.C. Heard), American Geophysical Union, Washington, D. C.. doi: 10.1029/GM036p0035

Author Information

  1. Research School of Earth Sciences, Australian National University, G.P.O. Box 4, Canberra, A.C.T., Australia, 2601

Publication History

  1. Published Online: 18 MAR 2013
  2. Published Print: 1 JAN 1986

ISBN Information

Print ISBN: 9780875900629

Online ISBN: 9781118664353

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Keywords:

  • Rocks—Testing—Addresses, essays, lectures;
  • Rock deformation—Addresses, essays, lectures

Summary

We have explored the differences in deformation mechanisms between “wet” and “dry” polycrystalline diopside experimentally deformed at temperatures of 900–1271°C, a confining pressure of 300 MPa, and a strain rate of 10−5/sec, conditions which are within the brittle-ductile transition region. Under nominally dry conditions, both grain boundary microcracking and dislocation glide were operative. Addition of 0.5 to 1 wt % water reduced the strength by promoting recovery and grain boundary mobility. This is the first reported instance in which crystal plasticity has been promoted in a silicate by addition of water at only moderate confining pressure. Both dry and wet samples have similar densities of microcracks, but in the wet samples they are occupied by small amounts of melt.