Plate impact experiments have been conducted on one fine-grained metamorphic rock, Carrara marble and one coarse-grained igneous rock, South Africa Gabbro. Embedded manganin stress gauges (i.e. longitudinal and lateral gauges) are used for the measurements of shock stresses. Shear strength are obtained by the difference of the longitudinal stress and lateral stress. Results suggest that rock materials are deforming in the inelastic manner and Hugoniot Elastic Limit (HEL) is deduced. Experimental results are compared and contrasted to the existing data for other geological materials. The detailed experimental procedures used to make measurements are to great extent standard methods when determining mechanical properties and deformation fields at high pressure.

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