Geochemistry and metamorphism of stratiform chromitite deposits, Bahia State, Brazil

Hdl Handle:
http://hdl.handle.net/10149/58331
Title:
Geochemistry and metamorphism of stratiform chromitite deposits, Bahia State, Brazil
Book Title:
Mineral deposits at the beginning of the 21st century
Authors:
Lord, R. A. (Richard); Prichard, H. M. (Hazel); Sá, J. H. S.; Neary, C. R.
Editors:
Piestrzynski, A. (Adam)
Affiliation:
University of Sunderland. School of Science. Applied Geology; University of Cardiff. Department of Earth Sciences; Universidade Federal da Bahia, Salvador, Brazil. Instituto de Geociencias; Natural Environment Research Council.
Citation:
Lord, R.A. et al.(2001) ‘Geochemistry and metamorphism of stratiform chromitite deposits, Bahia State, Brazil’, Proceedings of the joint sixth biennial SGA-SEG meeting, Krakow, Poland, 26-29 August 2001, in Piestrzynski, A. et al. (ed.) Mineral deposits at the beginning of the 21st century. Lisse: A. A. Balkema, pp.603-618.
Publisher:
A. A. Balkema Publishers
Conference:
Proceedings of the joint sixth biennial SGA-SEG meeting, Krakow, Poland, 26-29 August 2001
Issue Date:
Aug-2001
URI:
http://hdl.handle.net/10149/58331
Abstract:
The Campo Formoso and Jacurici Valley mining districts contain the two largest known reserves of chromite in Brazil. They are usually considered to be of stratiform type, although in the literature each deposit has also been referred to as "podiform" at some stage. Both are hosted by the ultramafic remnants of early Precambrian layered igneous complexes, surrounded by areas of tectonized granulite facies supracrustal gneisses of the Sao Francisco Craton. The form, alteration history and current metamorphic grade of each intrusion varies, although their geochemistry appears to be very similar. Both contain abundant chromite, are orthopyroxene-rich, highly magnesian and were probably derived from rather similar parent magmas of a komatiitic lineage. Chromite mineral chemistry shows high Cr2O3 contents combined with moderate TiO2 levels and gives ambiguous indications of tectonic setting. In part this reflects the primitive parental magma. However, grain core compositions also illustrate the contrasting effects of amphibolite facies versus granulite facies progressive metamorphism.
Type:
Meetings and Proceedings; Book Chapter
Keywords:
geochemistry; stratiform; chromite; Brazil; chromitite; Campo Formoso; Jacurici Valley
ISBN:
9026518463

Full metadata record

DC FieldValue Language
dc.contributor.authorLord, R. A. (Richard)-
dc.contributor.authorPrichard, H. M. (Hazel)-
dc.contributor.authorSá, J. H. S.-
dc.contributor.authorNeary, C. R.-
dc.contributor.editorPiestrzynski, A. (Adam)-
dc.date.accessioned2009-04-01T10:49:17Z-
dc.date.available2009-04-01T10:49:17Z-
dc.date.issued2001-08-
dc.identifier.isbn9026518463-
dc.identifier.urihttp://hdl.handle.net/10149/58331-
dc.description.abstractThe Campo Formoso and Jacurici Valley mining districts contain the two largest known reserves of chromite in Brazil. They are usually considered to be of stratiform type, although in the literature each deposit has also been referred to as "podiform" at some stage. Both are hosted by the ultramafic remnants of early Precambrian layered igneous complexes, surrounded by areas of tectonized granulite facies supracrustal gneisses of the Sao Francisco Craton. The form, alteration history and current metamorphic grade of each intrusion varies, although their geochemistry appears to be very similar. Both contain abundant chromite, are orthopyroxene-rich, highly magnesian and were probably derived from rather similar parent magmas of a komatiitic lineage. Chromite mineral chemistry shows high Cr2O3 contents combined with moderate TiO2 levels and gives ambiguous indications of tectonic setting. In part this reflects the primitive parental magma. However, grain core compositions also illustrate the contrasting effects of amphibolite facies versus granulite facies progressive metamorphism.-
dc.publisherA. A. Balkema Publishers-
dc.subjectgeochemistry-
dc.subjectstratiform-
dc.subjectchromite-
dc.subjectBrazil-
dc.subjectchromitite-
dc.subjectCampo Formoso-
dc.subjectJacurici Valley-
dc.titleGeochemistry and metamorphism of stratiform chromitite deposits, Bahia State, Brazil-
dc.typeMeetings and Proceedings-
dc.typeBook Chapter-
dc.contributor.departmentUniversity of Sunderland. School of Science. Applied Geology; University of Cardiff. Department of Earth Sciences; Universidade Federal da Bahia, Salvador, Brazil. Instituto de Geociencias; Natural Environment Research Council.-
dc.title.bookMineral deposits at the beginning of the 21st century-
dc.identifier.conferenceProceedings of the joint sixth biennial SGA-SEG meeting, Krakow, Poland, 26-29 August 2001-
ref.assessmentRAE 2008-
or.citation.harvardLord, R.A. et al.(2001) ‘Geochemistry and metamorphism of stratiform chromitite deposits, Bahia State, Brazil’, Proceedings of the joint sixth biennial SGA-SEG meeting, Krakow, Poland, 26-29 August 2001, in Piestrzynski, A. et al. (ed.) Mineral deposits at the beginning of the 21st century. Lisse: A. A. Balkema, pp.603-618.-
prism.startingPage603-
prism.endingPage618-
All Items in TeesRep are protected by copyright, with all rights reserved, unless otherwise indicated.