Kuyumjian, Raul Minas (1998) Kyanite-staurolite ortho-amphibolite from the Chapada Region, Goiás, Central Brazil. Mineralogical Magazine, 62 (4) 501-507 doi:10.1180/002646198547873
| Reference Type | Journal (article/letter/editorial) | ||
|---|---|---|---|
| Title | Kyanite-staurolite ortho-amphibolite from the Chapada Region, Goiás, Central Brazil | ||
| Journal | Mineralogical Magazine | ISSN | 0026-461X |
| Authors | Kuyumjian, Raul Minas | Author | |
| Year | 1998 (August) | Volume | 62 |
| Page(s) | 501-507 | Issue | 4 |
| Publisher | Mineralogical Society | ||
| Download URL | https://rruff.info/doclib/MinMag/Volume_62/62-4-501.pdf+ | ||
| DOI | doi:10.1180/002646198547873Search in ResearchGate | ||
| Mindat Ref. ID | 299 | Long-form Identifier | mindat:1:5:299:6 |
| GUID | b1446d3e-51cc-4ab2-83af-a3d1a299f7c0 | ||
| Full Reference | Kuyumjian, Raul Minas (1998) Kyanite-staurolite ortho-amphibolite from the Chapada Region, Goiás, Central Brazil. Mineralogical Magazine, 62 (4) 501-507 doi:10.1180/002646198547873 | ||
| Plain Text | Kuyumjian, Raul Minas (1998) Kyanite-staurolite ortho-amphibolite from the Chapada Region, Goiás, Central Brazil. Mineralogical Magazine, 62 (4) 501-507 doi:10.1180/002646198547873 | ||
| Abstract/Notes | 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 X mg 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. | ||
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