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Abstract
Seismological and petrologic studies have suggested the presence of mafic granulite, eclogite and amphibolite as the major components of the lower crust in southeastern Australia. Elastic wave velocity measurements (conducted to 400 MPa confining pressure) of selected nodules from one kimberlite pipe in South Australia, range, after corrections for estimated in situ crustal pressures and temperatures, from ( V P ) 6.9–7.7 km s −1 and ( V S ) 3.9–4.3 km s −1. These values fall between previous measurements for more silicic crustal granulites and mafic eclogites, and coincide with the published velocities determined by seismic studies for southeastern Australia. It is possible that these types of compositions may be widespread components of the lower continental crust, and may require revision of currently accepted models of crustal evolution.
Published Version
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