Thermal Gradient Migration of Fluid Inclusions in Single Crystals of Salt from the Waste Isolation Pilot Plant Site (WIPP)
Selected salt single crystals from core samples of bedded salt from the WIPP site have been tested to determine the rate of migration of their liquid-filled (fluid) inclusions in thermal gradients. Gradients of 1.5°C.cm−1, maintained for periods of 3–10 days, at ambient temperatures of 108°–260°C, resulted in rates of movement of 1.2–5.4 cm.yr −1 for cubic inclusions 1 mm on an edge. Inclusions 0.1 mm on an edge moved only ~30% as fast. Increase in ambient temperature and/or gradient increased the rate, in approximately direct proportion. The migration rate for inclusions in different parts of a given sample, however, may vary by a factor of 3, for unknown reasons, and some other interesting observed phenomena are still unexplained.
KeywordsFluid Inclusion Thermal Gradient Migration Rate Vapor Bubble Small Inclusion
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