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Kyanite-staurolite ortho-amphibolite from the Chapada Region, Goiás, Central Brazil

Published online by Cambridge University Press:  05 July 2018

Raul Minas Kuyumjian
Raul Minas Kuyumjian*
Affiliation:
Instituto de Geociências, Universidade de Brasília, 70910-900 Brasília, Brazil
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Abstract

This study deals with the kyanite-staurolite assemblage from a metabasite (ortho-amphibolite) in the Chapada area of the Neoproterozoic Mara Rosa volcano-sedimentary sequence of Goiás state, Brazil. It is closely associated with hydrothermally altered rocks and contains the assemblage hornblende, epidote, quartz, kyanite, staurolite, plagioclase and rutile. The staurolite from the amphibolite shows lower values of SiO2 and higher values of MgO, MnO, ZnO and Xmg than those in staurolites from the metasediments of the same area. In the Al–Na–Ca–(Fe+Mg) diagram, the amphibolite plots in the aluminous part of the diagram and the phase volume encloses the area of mafic volcanic bulk compositions. Field relations and compositions in both kyanite-staurolite amphibolite and staurolite are consistent with formation of this amphibolite as a result of metamorphism of metasomatised basalts.

Keywords

stauroliteortho-amphiboliteBrazil
Type
Research Article
Information
Mineralogical Magazine , Volume 62 , Issue 4 , August 1998 , pp. 501 - 507
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1998

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