An Experimental Study of the Basalt-Garnet Granulite-Eclogite Transition

  1. John G. Heacock
  1. Keisuke Ito and
  2. George C. Kennedy

Published Online: 15 MAR 2013

DOI: 10.1029/GM014p0303

The Structure and Physical Properties of the Earth's Crust

The Structure and Physical Properties of the Earth's Crust

How to Cite

Ito, K. and Kennedy, G. C. (1971) An Experimental Study of the Basalt-Garnet Granulite-Eclogite Transition, in The Structure and Physical Properties of the Earth's Crust (ed J. G. Heacock), American Geophysical Union, Washington D. C.. doi: 10.1029/GM014p0303

Author Information

  1. Institute of Geophysics And Planetary Physics University of California, Los Angeles, California 90024

Publication History

  1. Published Online: 15 MAR 2013
  2. Published Print: 1 JAN 1971

ISBN Information

Print ISBN: 9780875900148

Online ISBN: 9781118664049

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Keywords:

  • Average Ocean Tholeiite;
  • Basalt-garnet granulite-eclogite transition;
  • Mohorovicic discontinuity;
  • NM5 Glass;
  • Tholeiitic basalt

Summary

The recrystallization of a tholeiitic basalt to garnet granulite and to eclogite has been experimentally examined at temperatures ranging from 800°C up to the solidus of the rock. In addition, the solidus of tholeiitic basalt has been redetermined. The slope of the boundary separating the field of garnet granulite frpm that of basalt is P kb = 0.014 T°C - 5.4 kb. The boundary separating the field of garnet granulite from the field of eclogite has the equation P kb = 0.020 T°C + 4.0 kb. The equation of the newly determined solidus of tholeiitic basalt is T = 6.0 P kb + 1105°C. Curves relating the densities of the mineral assemblages to temperatures and pressures of formation are shown. One relatively abrupt change in density occurs as basalt recrystallizes to garnet granulite, and a second relatively sharp density increase occurs as garnet granulite is recrystallized to eclogite.