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Exploring the effect of lithium on pegmatitic textures; an experimental study

Victoria Maneta and Don R. Baker
Exploring the effect of lithium on pegmatitic textures; an experimental study
American Mineralogist (July 2014) 99 (7): 1383-1403

Abstract

The effect of lithium (Li) on the development of pegmatitic textures was evaluated experimentally at H (sub 2) O-saturated and H (sub 2) O-undersaturated conditions at 500 MPa pressure and temperatures ranging from 400 to 800 degrees C. The addition of approximately 3700 ppm Li to a starting material of common granitic composition (Lake County obsidian) reduces the crystallization and melting temperatures by approximately 50-70 and 200 degrees C, respectively, and promotes the formation of quartz-feldspar graphic and granophyric intergrowths. The presence of Li in the hydrous granitic system lowers significantly the degree of undercooling needed for the development of graphic and granophyric intergrowths to 85-110 degrees C in comparison with the Li-free systems where approximately 200 degrees C of undercooling is necessary. The feldspar crystals developed in Li-bearing samples can incorporate from 150 to 250 ppm Li, assume skeletal and spherulitic morphologies, and exhibit one order of magnitude faster growth rates than crystals in Li-free samples. The results of this study attest to the effectiveness of Li as a fluxing agent and highlight the crucial role it plays in the development of pegmatitic textures, leading to important implications for the conditions of formation of Li-bearing granitic pegmatites.


ISSN: 0003-004X
EISSN: 1945-3027
Coden: AMMIAY
Serial Title: American Mineralogist
Serial Volume: 99
Serial Issue: 7
Title: Exploring the effect of lithium on pegmatitic textures; an experimental study
Affiliation: McGill University, Department of Earth and Planetary Sciences, Montreal, QC, Canada
Pages: 1383-1403
Published: 201407
Text Language: English
Publisher: Mineralogical Society of America, Washington, DC, United States
References: 60
Accession Number: 2014-058173
Categories: Igneous and metamorphic petrology
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. 4 tables
N42°00'00" - N43°37'00", W121°22'60" - W119°22'00"
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Abstract, copyright, Mineralogical Society of America. Reference includes data from GeoScienceWorld, Alexandria, VA, United States
Update Code: 201431
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