A Caltech Library Service

Melting of Granite with Excess Water to 30 Kilobars Pressure

Boettcher, A. L. and Wyllie, P. J. (1968) Melting of Granite with Excess Water to 30 Kilobars Pressure. Journal of Geology, 76 (2). pp. 235-244. ISSN 0022-1376.

Full text is not posted in this repository. Consult Related URLs below.

Use this Persistent URL to link to this item:


A chemically analyzed biotite granite from the Dinkey Lakes, Sierra Nevada Batholith, consists of 34.8 per cent quartz, 31.5 per cent plagioclase, 29 per cent orthoclase, and 4.7 per cent mafic minerals (mainly biotite). The crushed rock, sealed with 25-35 wt. per cent H_2O in platinum capsules, was reacted in piston-cylinder apparatus. The curve for the beginning of melting passed through 620° ± 5° C. at 10 kb. and 605° ± 5° C. at 15.3 kb. At about 17 kb., the plagioclase broke down to yield jadeite and quartz, and the solidus curve then began to increase in temperature with increasing pressure, reaching 670° C. at 27 kb. At higher pressures, quartz was transformed to coesite, and the melting curve continued to rise. In subsolidus runs at 20 kb., the original orthoclase and biotite were completely dissolved in the aqueous vapor phase. These experimental results, along with similar results in the SiO_2-excess portion of the system NaAlSiO_4- SiO_2-H_2O, provide no support for the theoretical predictions that solid-liquid-vapor melting curves should pass through a temperature minimum at 10 kb. or less. The water-saturated melting curve for the granite provides physical limits for the generation of silicate magmas within the crust and mantle.

Item Type:Article
Related URLs:
URLURL TypeDescription
Additional Information:© 1968 University of Chicago Press. Manuscript received September 15, 1967; revised October 18, 1967. We wish to thank P.C. Bateman and F.C. Dodge for supplying the granite, its chemical analysis, and mode; and A.J. Piwinskii for permitting us to use his unpublished data on the compositions of the feldspars in the granite, and on the solidus temperatures at 1, 2, and 3 kb. The manuscript benefited from review by C. Wayne Burnham and R.C. Newton. The work was supported by National Science Foundation grant GA-923, using apparatus supplied by Advanced Research Projects Agency contract SD-89.
Funding AgencyGrant Number
Advanced Research Projects Agency (ARPA)SD-89
Issue or Number:2
Record Number:CaltechAUTHORS:20160122-103330817
Persistent URL:
Official Citation:Boettcher, A. L., and P. J. Wyllie. “Melting of Granite with Excess Water to 30 Kilobars Pressure”. The Journal of Geology 76.2 (1968): 235–244
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:63887
Deposited By: Tony Diaz
Deposited On:22 Jan 2016 20:26
Last Modified:03 Oct 2019 09:32

Repository Staff Only: item control page