Hostname: page-component-cb9f654ff-5kfdg Total loading time: 0 Render date: 2025-08-12T03:22:47.928Z Has data issue: false hasContentIssue false
  • English
  • Français

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
Get access Rights & Permissions [Opens in a new window]

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.

Keywords

stauroliteortho-amphiboliteBrazil

Information

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

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

Article purchase

Temporarily unavailable

References

Beach, A. (1973) The mineralogy of high-temperature shear zones at Scourie, N.W. Scotland. J. Petrol., 14, 231–48.CrossRefGoogle Scholar
Cooper, A.F. (1980) Retrograde alteration of chromian kyanite in metachert and amphibole whiteschist from the Southern Alps, New Zealand, with implications for uplift on the Alpine fault. Contrib. Mineral. Petrol., 75, 153–64.CrossRefGoogle Scholar
Deer, W.A., Howie, R.A. and Zussman, J. (1982) Rock-forming Minerals, 1A, Orthosilicates. Wiley, New York.Google Scholar
Demange, M. (1976) Une paragenese a staurotide et tschermakite d'Ovala (Gabon). Bull. Soc. Fr. Mineral. Cristallogr., 99, 379–402.Google Scholar
Enami, M. and Zang, Q. (1988) Magnesian staurolite in garnet-corundum rocks and eclogite from the Donghoi district, Jiangsu Province, east China. Amer. Mineral., 73, 48–58.Google Scholar
Ganguly, J. (1972) Staurolite stability and related parageneses: theory, experiments and applications. J. Petrol., 13, 335–65.CrossRefGoogle Scholar
Gelinas, L., Mellinger, M. and Trudel, P. (1982) Archaean mafic metavolcanics from the Rouyn- Noranda district, Quebec. 1. Mobility of the major elements. Canad. J. Earth Sci., 9, 2258–75.CrossRefGoogle Scholar
Gibson, G.M. (1979) Margarite in kyanite- and corundum-bearing anorthosite, amphibolite, and homblendite from central Fiordland, New Zealand. Contrib. Mineral. Petrol., 68, 171-9.Google Scholar
Griffen, D.T. and Ribbe, P.H. (1973) The crystal chemistry of staurolite. Amer. J. Sci., 273-A, 478–95.Google Scholar
Hellman, P.L. and Green, T.H. (1979) The high-pressure experimental crystallization of staurolite in hydrous mafic compositions. Contrib. Mineral. Petrol., 68, 369–72.CrossRefGoogle Scholar
Helms, T.S., McSween, H.Y., Laolka, T.C. and Jarosewich, F.E. (1987) Petrology of a Georgia Blue Ridge amphibolite unit with hornblendegedrite-kyanite-staurolite. Amer. Mineral., 72, 1086–96.Google Scholar
Jan, M.Q., Kempe, D.R.C. and Tahirkheli, R.A.K. (1971) Corundum, altering to margarite, in amphibolites from Dir, West Pakistan. Mineral. Mag., 38, 106–9.CrossRefGoogle Scholar
Kuang-Yuan, C., Meihma, L., Xuefang, W., Daisheng, S., Chuanmin, S., Zufu, W., Yuxuan, S. and Jiaxiang, L. (1984) Genetic mineralogy of Gong-Changling iron mine, China. J. Minerals and Rocks (China), 27–42.Google Scholar
Kuyumjian, R.M. (1989) The geochemistry and tectonic significance of amphibolites from the Chapada sequence, central Brazil. Unpublished Univ. of London Thesis, 289 pp.Google Scholar
Kuyumjian, R.M. (1991) A suggested hydrothermal exhalative origin for the Chapada copper-gold deposit, Brazil. Syrup. Brazil Gold 91, Belo Horizonte, Brazil. Proceedings, 231–4.Google Scholar
Leake, B.E. (1978) Nomenclature of amphiboles. Amer. Mineral., 63, 1023–52.Google Scholar
Mattheus, S., Richter, P. and Schmidt, K. (1970) Die eklogitvorkonmen des kristallinen Disten (kyanit) der eklogite und eklogitamphibolite der Munchberger gneisgebietes. Neues Jahrb. Mineral. Abh., 113, 111–37.Google Scholar
Miyashiro, A. (1973) Metamorphism and Metamorphic Belts. George Allen and Unwin, London. 244–6.CrossRefGoogle Scholar
Moeen, S. (1991) Staurolite from a metabasite and its paragenesis. Mineral. Mag., 55, 140–2.CrossRefGoogle Scholar
Pimentel, M.M., Fuck, R.A., Machado, N., Fuck, R.F., Ribeiro, R.K. and Viana, M.G. (1993) IV Congresso Brasileiro Geoquimica, Brasília, Brazil. Anais, 255–8.Google Scholar
Richardson, S.V., Kesler, S.E. and Essene, E.J. (1986) Origin and geochemistry of the Chapada Cu-Au deposit, Goiás, Brazil: a metamorphosed wall-rock porphyry copper deposit. Econ. Geol. 81, 1884–98.CrossRefGoogle Scholar
Richardson, S.V., Jones, M.L. and Kesler, S.E. (1988) Strontium isotopic geochemistry of Pan-African/ Brasiliano rocks, Chapada copper deposit, Goiás, Brazil Geol. Rundschau, 77, 763–70.CrossRefGoogle Scholar
Schreyer, W. (1988) Experimental studies on metamorphism of crustal rocks under mantle pressures. Mineral. Mag., 52, 1–26.CrossRefGoogle Scholar
Schreyer, W. and Seifert, F. (1969) High-pressure phases in the system MgO-Al2O3-SiO2-H2O. Amer. J. Sci., 267A, 407–43.Google Scholar
Selverstone, J., Spear, F.S., Franz, G. and Morteani, G. (1984) P-T-t paths for hornblende + kyanite + staurolite garbenschists: high-pressure metamorphism in the western Tauern Window, Australia. J. Petrol., 25 (2), 501–31.CrossRefGoogle Scholar
Shand, S.J. (1951) Eruptive Rocks. John Wiley and Sons, New York, 488 p.Google Scholar
Soto, J.I. and Azañón, J.M. (1993) The breakdown of Zn-rich staurolite in a metabasite from the Betic Cordillera (SE Spain). Mineral. Mag., 57, 530–33.CrossRefGoogle Scholar
Spear, F.S. (1982) Phase equilibria of amphibolites from teh Post Pond Volcanics, Mt. Cube quadrangle, Vermont. J. Petrol., 23, 383–426.CrossRefGoogle Scholar
Tilley, C.E. (1928) The paragenesis of kyaniteamphibolites. Mineral. Mag., 24, 555–68.Google Scholar
Vallance, T.G. (1969) Recognition of specific magmatic character in some Palaeozoic mafic lavas in New South Wales. Geol. Soc. Australia, Sp. Publ., 2, 163–7.Google Scholar