(Energetics of silicate melts from thermal diffusion studies): Progress report for the second year's activities, January--December 1988

Technical Report · Fri Jan 01 00:00:00 EST 1988

OSTI ID:6875707

Lesher, C; Walker, D

The second year of this three year renewal has been used to continue data collection and analysis of thermal (Soret) diffusion in silicate liquid and explore the related process of thermal migration in subliquidus magmas. During the past year we have expanded our experimental capabilities for thermal gradient work by the construction of two new miniaturized piston-cylinder devices capable of 20kb. This has greatly alleviated the bottleneck on our existing facilities and has permitted us to undertake long term thermal diffusion experiments which have been prohibitive in the past. Data collection efforts have also been materially aided by advances in thermal insulation in the pressure media outside our pressurized cylindrical heaters. BaCO/sub 3/ + 10%Cr/sub 2/O/sub 3/ is very effective in protecting the pressure vessel core from thermal deterioration with the result that the heater inside and outside diameters can be substantially increased. This permits several charges to be run simultaneously in an axisymmetric cluster around a double or triple junction thermocouple which can measure axial thermal gradients in situ. These thermal insulation and charge volume increase innovations also have been adapted in our on going studies of mineral-liquid element partitioning, silicate mineral dissolution and silicate liquid interdiffusion and should prove to be wide applicability and utility in other piston-cylinder laboratories, as well. 13 refs.

• Research Organization: Columbia Univ., Palisades, NY (USA). Lamont-Doherty Geological Observatory
• DOE Contract Number: FG02-84ER13287
• OSTI ID: 6875707
• Report Number(s): DOE/ER/13287-3; ON: DE89003045
• Resource Relation: Other Information: Portions of this document are illegible in microfiche products
• Country of Publication: United States
• Language: English

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PROGRESS REPORT
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