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An experimental study on cubanite irreversibility; implications for natural chalcopyrite-cubanite intergrowths

Kamal L. Pruseth, Biswajit Mishra and Heinz J. Bernhardt
An experimental study on cubanite irreversibility; implications for natural chalcopyrite-cubanite intergrowths
European Journal of Mineralogy (June 1999) 11 (3): 471-476

Abstract

Isocubanite, CuFe (sub 2) S (sub 3) , was synthesized at 700 degrees C by reaction of the component sulphides and sulphur in evacuated silica tubes; EPMA showed a nearly stoichiometric composition. Annealing at 185 degrees C for 4, 8, 12, 24 and 32 days produced equant grains of pyrrhotite and chalcopyrite lamellae and spindles parallel to (111) and (110) within the isocubanite matrix. The formation of pyrrhotite shows that the chalcopyrite is not produced by simple exsolution, but is due to the breakdown reaction CuFe (sub 2) S (sub 3) = CuFeS (sub 2) + FeS. Repeated homogenization and annealing resulted in thicker chalcopyrite lamellae. The possible mechanism for the intergrowth of orthorhombic cubanite within chalcopyrite, characteristic of ancient hydrothermal deposits, from the intergrowth of chalcopyrite within isocubanite that is exclusively encountered in modern sea-floor hydrothermal deposits, is discussed.


ISSN: 0935-1221
Serial Title: European Journal of Mineralogy
Serial Volume: 11
Serial Issue: 3
Title: An experimental study on cubanite irreversibility; implications for natural chalcopyrite-cubanite intergrowths
Affiliation: Indian Institute of Technology, Department of Geology and Geophysics, Kharagpur, India
Pages: 471-476
Published: 199906
Text Language: English
Publisher: Schweizerbart'sche Verlagsbuchhandlung (Naegele u. Obermiller), Stuttgart, Federal Republic of Germany
References: 19
Accession Number: 1999-046896
Categories: Mineralogy of non-silicates
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. 2 tables
Secondary Affiliation: Ruhr Universitaet, DEU, Federal Republic of Germany
Country of Publication: Germany
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Reference includes data from Mineralogical Abstracts, United KingdomTwickenhamUKUnited Kingdom
Update Code: 199916
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