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Crystal chemistry and structural refinement of chromites from different chromitite layers and xenoliths of the Bushveld Complex

Davide Lenaz, Raffaella Braidotti, Francesco Princivalle, Giorgio Garuti and Federica Zaccarini
Crystal chemistry and structural refinement of chromites from different chromitite layers and xenoliths of the Bushveld Complex
European Journal of Mineralogy (July 2007) 19 (4): 599-609

Abstract

Crystal chemistry and structural refinement of 20 chromite crystals representative of different chromitites layers and xenoliths from the Critical Zone of the Bushveld Complex have been studied. Small differences in the structural parameters of chromites have been found along the Bushveld sequence and these allowed to discriminate two main subdivision between the Lower and Middle Group samples and the Upper Group and Merensky Reef samples. The small increase of chromite oxygen coordinates seems to be related with the decrease of cooling rates as estimated from the filling and cooling model for the Bushveld Complex proposed by Cawthorn & Walraven (1998). In fact, the cooling rates for Upper Group and Merensky Reef are smaller than that of Lower Group and Middle Group. Moreover, peculiar structural parameters have been found for chromites in the Tweefontein pipe suggesting different cooling rates.


ISSN: 0935-1221
EISSN: 1617-4011
Serial Title: European Journal of Mineralogy
Serial Volume: 19
Serial Issue: 4
Title: Crystal chemistry and structural refinement of chromites from different chromitite layers and xenoliths of the Bushveld Complex
Affiliation: Dipartimento di Scienze della Terra, Trieste, Italy
Pages: 599-609
Published: 200707
Text Language: English
Publisher: Schweizerbart'sche Verlagsbuchhandlung (Naegele u. Obermiller), Stuttgart, Federal Republic of Germany
References: 42
Accession Number: 2007-102025
Categories: Igneous and metamorphic petrologyMineralogy of non-silicates
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. 2 tables, strat. col.
Secondary Affiliation: Instituto Andaluz de Ciencias de la Tierra, ESP, Spain
Country of Publication: Germany
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Abstract, copyright, Schweizerbart'sche Verlagsbuchhandlung. Reference includes data from GeoScienceWorld, Alexandria, VA, United States
Update Code: 200744
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