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Rock-water systems, with special reference to the water-deficient region

Robertson, J. K. and Wyllie, P. J. (1971) Rock-water systems, with special reference to the water-deficient region. American Journal of Science, 271 (3). pp. 252-277. ISSN 0002-9599. doi:10.2475/ajs.271.3.252. https://resolver.caltech.edu/CaltechAUTHORS:20160126-111825527

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Abstract

The four types of subsolidus assemblages in silicate-water systems are: Type I, water-absent; assemblage of anhydrous minerals with no vapor phase. Type II, water-deficient and vapor-absent; assemblage of minerals including hydrous minerals, but with no vapor phase. Type III, water-deficient and vapor-present; an assemblage of minerals, with or without hydrous minerals, with a vapor phase; there is insufficient water present to saturate the liquid when the crystalline assemblage is completely melted at the existing pressure. Type IV, water-excess; an assemblage of minerals and vapor with at least enough water to saturate the liquid when the crystalline assemblage is completely melted at the existing pressure. Water-deficient systems of types II and III are significant for magma generation and crystallization; there are few experimental results. Water-deficient phase relationships can be estimated by interpolation between available experimental data for systems of types I and IV. Mantle magmas are generated in type I, II, or III systems. The first liquid produced in type III systems is H_20-saturated, and the first liquid in type II systems is H_2O-undersaturated. It appears that the normal product of partial fusion of many continental crustal rocks is a H_2O-undersaturated granite liquid in a crystal mush, and that liquids of intermediate composition are not generated because temperatures required are too high. Phase relationships are depicted for granodiorite in a pressure-temperature- water diagram.


Item Type:Article
Related URLs:
URLURL TypeDescription
http://dx.doi.org/10.2475/ajs.271.3.252DOIArticle
http://www.ajsonline.org/content/271/3/252PublisherArticle
Additional Information:© 1971 American Journal of Science. We thank the National Science Foundation for Grant GA-10459 which has supported this research, Advanced Research Projects Agency Grant SD-89 to the Physical Sciences Division for a research assistantship for J. K. Robertson, many colleagues for discussion of the scheme developed, G. L. Millhollen for a critical review, and two anonymous reviewers whose comments led to this revised version with more explanation and justification of claims than the first manuscript submitted in August, 1970.
Funders:
Funding AgencyGrant Number
NSFGA-10459
Advanced Research Projects Agency (ARPA)SD-89
Issue or Number:3
DOI:10.2475/ajs.271.3.252
Record Number:CaltechAUTHORS:20160126-111825527
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20160126-111825527
Official Citation:J. K. Robertson and P. J. Wyllie Rock-water systems, with special reference to the water-deficient region Am J Sci October 1, 1971 271:252-277; doi:10.2475/ajs.271.3.252
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:63972
Collection:CaltechAUTHORS
Deposited By: Tony Diaz
Deposited On:26 Jan 2016 19:27
Last Modified:10 Nov 2021 23:23

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