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Experimental Studies of Igneous Rock Series: The Farrington Complex, North Carolina, and the Star Mountain Rhyolite, Texas

Gibbon, D. L. and Wyllie, P. J. (1969) Experimental Studies of Igneous Rock Series: The Farrington Complex, North Carolina, and the Star Mountain Rhyolite, Texas. Journal of Geology, 77 (2). pp. 221-239. ISSN 0022-1376. https://resolver.caltech.edu/CaltechAUTHORS:20160129-100248137

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Abstract

The phase relationships of four specimens from the Farrington Complex ranging in composition from granite to tonalite, and of four specimens from the Star Mountain Rhyolite, have been determined in the presence of 15-20 weight per cent H_2O in the pressure range from 1 to 3 kb. PT curves have been located for the beginning of melting and for the complete melting of quartz, alkali feldspar, and plagioclase. Glass percentages have been determined for representative samples by point counting in polished thin sections. The melting relationships for these two widely different series of rocks aid in defining the primary phase volumes in the "Granodiorite Tetrahedron." It has not been possible experimentally to reproduce the unusual natural phenocryst-groundmass relationships of the Star Mountain Rhyolite; this failure is attributed at least partly to the experimental condition of excess water, and confirms the conclusion, drawn from petrographic evidence, that these magmas were erupted with very low water contents.


Item Type:Article
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http://www.jstor.org/stable/30063920JSTORArticle
Additional Information:© 1969 University of Chicago Press. Manuscript received April 27, 1968; revised June 27, 1968. The research reported in this study was supported by NSF grant GP-3440. Some costs of manuscript preparation were covered by NSF grant GA-923 at the University of Chicago. A.J. Piwinskii provided much technical assistance and discussion on the meaning of the results. E.W. White was of great assistance during probe runs.
Funders:
Funding AgencyGrant Number
NSFGP-3440
NSFGA-923
Issue or Number:2
Record Number:CaltechAUTHORS:20160129-100248137
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20160129-100248137
Official Citation:Gibbon, D. L., and P. J. Wyllie. “Experimental Studies of Igneous Rock Series: The Farrington Complex, North Carolina, and the Star Mountain Rhyolite, Texas”. The Journal of Geology 77.2 (1969): 221–239
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:64089
Collection:CaltechAUTHORS
Deposited By: Tony Diaz
Deposited On:29 Jan 2016 19:56
Last Modified:03 Oct 2019 09:34

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