| Reference Type | Journal (article/letter/editorial) |
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| Title | Metamorphism of hydrothermally altered rocks in a volcanogenic massive sulfide deposit: the Palmeirópolis, Brazil, example. |
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| Journal | Revista Brasileira de Geociências |
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| Authors | Araujo, Sylvia M. | Author |
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| Fawcett, J. Jeffrey | Author |
| Scott, Steven D. | Author |
| Year | 1995 (June 1) | Volume | 25 |
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| Issue | 3 |
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| Publisher | Sociedade Brasileira de Geologia |
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| DOI | doi:10.25249/0375-7536.1995173184Search in ResearchGate |
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| Classification | Not set | LoC | Not set |
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| Mindat Ref. ID | 1032562 | Long-form Identifier | mindat:1:5:1032562:9 |
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| GUID | 0 |
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| Full Reference | Araujo, Sylvia M., Fawcett, J. Jeffrey, Scott, Steven D. (1995) Metamorphism of hydrothermally altered rocks in a volcanogenic massive sulfide deposit: the Palmeirópolis, Brazil, example. Revista Brasileira de Geociências, 25 (3) 173-184 doi:10.25249/0375-7536.1995173184 |
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| Plain Text | Araujo, Sylvia M., Fawcett, J. Jeffrey, Scott, Steven D. (1995) Metamorphism of hydrothermally altered rocks in a volcanogenic massive sulfide deposit: the Palmeirópolis, Brazil, example. Revista Brasileira de Geociências, 25 (3) 173-184 doi:10.25249/0375-7536.1995173184 |
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| In | (1995, June) Revista Brasileira de Geociências Vol. 25 (3) Sociedade Brasileira de Geologia |
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| Abstract/Notes | The PALMEIRÓPOLIS Cu-Zn (Pb) volcanogenic massive sulfide deposit, Brazil, consists of three ore bodies enclosed by hydrothermal alteration zones. The ore bodies and the alteration zones were metamorphosed under amphibolite fades conditions. The Palmeirdpolis alteration zones are characterized by a great diversity of bulk rock composition that originated a wide variety of low variance mineral assemblages. These assemblages are composed of orthoamphiboles (anthophyllite and gedrite), hornblende, biotite, garnet, staurolite, sillimanite, gahnite and, rarer, cordierite. Based on analyses of mineral chemistry aad mineral assemblages, temperatures are estimated to have been 550 - 625°C and pressures 2 - 5.5 kbar. The temperature of metamorphism that prevailed at the Palmeirdpolis deposit is comparable to other amphibolite fades massive sulfide deposits, such as Geco and Linda, Canada; Falun, Sweden; and Bleikvassli, Norway. The mineralogy of the alteration zones is similar in all these deposits even though they were metamorphosed at different pressure conditions, reflected by the crystallization of one of Al2SiO5 phase (andalusite, sillimanite or kyanite). |
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