An interlaboratory comparison of piston-cylinder pressure calibration using the albite-breakdown reaction |
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| Authors: | W Johannes P M Bell H K Mao A L Boettcher D W Chipman J F Hays R C Newton F Seifert |
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| Institution: | (1) T.U., Hannover, Deutschland;(2) Geophysical Laboratory, N.W. Washington;(3) Pennsylvania State University, USA;(4) Harvard University, USA;(5) University of Chicago, USA;(6) Ruhr-Universität Bochum, Deutschland |
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| Abstract: | The pressure of the reaction albite=jadeite and quartz was measured at 600° C by workers in six geophysical laboratories for the purpose of comparing pressure calibration procedures for the solid-pressure piston-cylinder apparatus. All groups used the same starting mix of crystalline reactant and products and all obtained hydrothermal reversals of the equilibrium. Solid pressure media used included talc, NaCl, boron nitride, pyrophyllite, pyrex glass and crushable ceramic. Various means of calibration were used, including internal standardization by transitions in indicator substances and the piston-in, piston-out bracketing method.There was agreement among all groups—the average preferred value of 16.3 kilobars at 600° C is enclosed by all of the error brackets assigned by the various investigators. This average preferred value is lower by nearly two kilobars than the often-quoted extrapolation of Birch and LeComte's data (1960). It will be important for both petrology and high-pressure technology to test this result in a very high gas pressure apparatus. |
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