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Mineralogy of the Labrieville anorthosite, Quebec

Alfred T. Anderson
Mineralogy of the Labrieville anorthosite, Quebec
American Mineralogist (1966) 51: 1671-1711


The Labrieville anorthosite massif is an example of crystallization differentiation in a plutonic environment. The lithologic sequence is: anorthosite (earliest), gabbroic anorthosite, iron-titanium oxide-rich gabbro, and syenite (latest). The earliest liquid consisted of at least 84 percent feldspar constituents and had water fugacity of less than 500 bars. At the oxide-rich gabbro stage, biotite indicates that the lowest crystallization temperature exceeded 880 degrees C and the highest water fugacity was less than 2,000 bars. A massive hemo-ilmenite deposit formed early as a result of immiscibility of silicate and iron-titanium oxide liquids, which separated at about 1100 degrees C or higher, as shown by fractionation of oxygen isotopes. Mineralogic data are given for feldspars, iron-titanium oxides, pyroxenes, apatites and biotites.

ISSN: 0003-004X
EISSN: 1945-3027
Serial Title: American Mineralogist
Serial Volume: 51
Title: Mineralogy of the Labrieville anorthosite, Quebec
Pages: 1671-1711
Published: 1966
Text Language: English
Publisher: Mineralogical Society of America, Washington, DC, United States
Accession Number: 1966-006542
Categories: Igneous and metamorphic petrology
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus., tables
N45°00'00" - N63°00'00", W79°00'00" - W57°00'00"
Source Note: nos. 11-12
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Reference includes data from Bibliography and Index of North American Geology, U. S. Geological Survey, Reston, VA, United States
Update Code: 1966
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