Shock Induced Gold Redistribution in Quartz‐Pyrite Mixture
作者:
S. M. Zhmodik,
N. V. Verkhovtseva,
V. F. Nesterenko,
B. M. Chikov,
E. Airijant,
N. A. Nemirovskaya,
期刊:
AIP Conference Proceedings
(AIP Available online 1904)
卷期:
Volume 706,
issue 1
页码: 1496-1499
ISSN:0094-243X
年代: 1904
DOI:10.1063/1.1780522
出版商: AIP
数据来源: AIP
摘要:
Au redistribution induced by 13.5 GPa shock was studied in cylindrical geometry of explosive loading of porous mixture of quartz and pyrite with Au+radionuclide195Au. Part of Au was evaporated and precipitated on the surfaces of minerals. Maximal concentration was detected in siliceous melt in the bottom of the capsule that can be explained by “snowplow” motion (or jetting) of gold vapor in front of Mach shock. In direction perpendicular to axis the distribution of Au had a “wavy” character probably due to preferential diffusion of Au vapor along shear bands. Evaporation of Au can only be explained by highly nonequilibrium energy release in porous mixtures. These data may be useful in understanding of the mechanism of anomalous concentration of Au and other elements in the impact structures in nature. © 2004 American Institute of Physics
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