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Phase relationships of gabbro-tonalite-granite-water at 15 kbar with applications to differentiation and anatexis

Huang, Wuu-Liang and Wyllie, Peter J. (1986) Phase relationships of gabbro-tonalite-granite-water at 15 kbar with applications to differentiation and anatexis. American Mineralogist, 71 (3-4). pp. 301-316. ISSN 0003-004X. http://resolver.caltech.edu/CaltechAUTHORS:20160126-160726707

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Abstract

Phase relationships have been determined at 15 kbar with variable H_2O contents for three rocks-a gabbro, a tonalite, and a muscovite granite-representing the compositional trend of the calc-alkaline rock series. Experiments were conducted in 0.5-in. piston-cylinder apparatus using Ag-Pd or Pt capsules. The results obtained are acceptable representations of the phase relationships for elucidation of petrological processes. Selected runs with 5% H_2O were completed using Au capsules to overcome the problem of iron loss, up to the temperature limit of Au, for reliable electron microprobe analyses of glass, garnet, clinopyroxene, amphibole, and plagioclase. No glasses could be analyzed in the gabbro. The data provide K_D values as a function of temperature for pairs of coexisting minerals and liquid. The chemical variations are used to evaluate (1) the fractionation trends in hydrous magmas at 55 km in thickened continental crust or uppermost mantle and (2) the products of anatexis of the thickened crust. At this depth, fractionation of hydrous basalt, or anatexis of gabbro and tonalite or their metamorphosed equivalents, appears to produce liquids diverging from the calc-alkaline trend. Anatexis of granite produces a liquid less siliceous than itself, with some chemical characteristics of syenite.


Item Type:Article
Related URLs:
URLURL TypeDescription
http://www.minsocam.org/msa/collectors_corner/amtoc/toc1986.htmPublisherIssue Table of Contents
Additional Information:© 1986 Mineralogical Society of America. Manuscript received April 8, 1985; Manuscript accepted November 4, 1985. This research was supported by the Earth Science Section of the National Science Foundation, NSF grant EAR 84-07115. Exxon Production Research Company contributed to manuscript preparation costs.
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Funding AgencyGrant Number
NSFEAR 84-07115
Exxon Production Research CompanyUNSPECIFIED
Record Number:CaltechAUTHORS:20160126-160726707
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:20160126-160726707
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:63986
Collection:CaltechAUTHORS
Deposited By: Tony Diaz
Deposited On:27 Jan 2016 00:17
Last Modified:27 Jan 2016 00:17

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