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Electron microprobe measurement of pyroxenes coexisting with H_2O-undersaturated liquid in the join CaMgSi_2O_6-Mg_2Si_2O_6-H_2O at 30 kilobars, with applications to geothermometry

Nehru, Cherukupalli E. and Wyllie, Peter J. (1974) Electron microprobe measurement of pyroxenes coexisting with H_2O-undersaturated liquid in the join CaMgSi_2O_6-Mg_2Si_2O_6-H_2O at 30 kilobars, with applications to geothermometry. Contributions to Mineralogy and Petrology, 48 (3). pp. 221-228. ISSN 0010-7999. https://resolver.caltech.edu/CaltechAUTHORS:20160203-143010090

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Abstract

Mixtures of synthetic crystalline enstatite and diopside were reacted with small water contents in sealed capsules in piston-cylinder apparatus at 30 kb between 1000° C and 1700° C. The compositions of coexisting enstatite and diopside solid solutions were measured with an ARL-EMX electron microprobe between 1000° C and 1500° C. Between 1100° C and 1500° C the pyroxenes coexisted with H_2O-undersaturated liquid which quenched to inhomogeneous pyroxene crystals. The presence of liquid facilitated growth of pyroxene crystals suitable for microprobe determinations. The solvus of Davis and Boyd (1966) is generally used in geothermometry; our enstatite solvus limb is a few mol-% richer in Mg_2Si_2O_6 in the temperature range 1000–1400° C; our diopside solvus limb is a few mol-% richer in Mg_2Si_2O_6 below 1100°C, in close agreement between 1100° C and 1200° C, but richer in CaMgSi_2O_6 between 1200° C and 1500° C. Estimated equilibration temperatures for a diopside with composition 78.7% Di is 1300° C according to our results compared with 1210° C for the Davis and Boyd solvus.


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http://dx.doi.org/10.1007/BF00383357DOIArticle
http://link.springer.com/article/10.1007%2FBF00383357PublisherArticle
Alternate Title:Electron microprobe measurement of pyroxenes coexisting with H2O-undersaturated liquid in the join CaMgSi2O6-Mg2Si2O6-H2O at 30 kilobars, with applications to geothermometry
Additional Information:© 1974 Springer-Verlag. Received October 7, 1974. This research was supported by the Earth Sciences Section, National Science Foundation NSF Grant GA-41730. We wish to acknowledge also the general support of the Materials Research Laboratory by the National Science Foundation, and the assistance of Drs. I. Steele, W. Huang, S. Maaløe, and R.C. Newton.
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NSFGA-41730
Issue or Number:3
Record Number:CaltechAUTHORS:20160203-143010090
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20160203-143010090
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:64204
Collection:CaltechAUTHORS
Deposited By: Tony Diaz
Deposited On:03 Feb 2016 22:48
Last Modified:03 Oct 2019 09:35

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