Abstract
Orthoclase has been experimentally shock loaded in porous mixtures with copper powder and as porous layers. Pressures up to 345 kb were obtained by utilizing reverberations within orthoclase from the higher impedance copper matrix and encasing stainless steel holder. Consequently, postshock temperatures were controlled to rather lower values than if the same pressures were achieved by single shock pulse. It was found that orthoclase commences to form diaplectic glass at 240 kb, and at 320 kb almost the entire sample is transformed. The pressure at which this glass formation is initiated was not affected by varying the duration of the shock pulse from 1 to 4 μsec. Orthoclase in porous matrix of similar shock impedance, if singly shocked as in natural events, will probably transform at rather lower pressures than those found in this experiment, owing to much higher postshock temperatures.
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