Experimental annealing of a natural dunite

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Abstract
Samples cut from a natural dunite were annealed at 1,100-1,700° C for o., 1-2,000 hours, at atmospheric pressure and under controlled oxygen fugacity. The evolution of free dislocation density and (100) tilt walls spacing was studied. Several recovery mechanisms have been observed. The mean ascent velocity of kimberlitic magma is expected to be 1 to 1.5 km/h, from the analysis of the dislocation microstructure in peridotite nodules.

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