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Mineralogia e geoquímica de ocorrências manganesíferas da bacia Alto Tapajós, sudeste do estado do Amazonas, Brasil
| Content Provider | Semantic Scholar |
|---|---|
| Author | Silva, Paulo José Mota Da Horbe, Adriana Maria Coimbra Horbe, Marco Antônio |
| Copyright Year | 2012 |
| Abstract | in six of almost fifty occurrences identified to now in Apuí, novo Aripuanã and Manicoré municipalities, southeast Amazonas state, the manganese is hosted as lenses, laminations and layers in red sandstones, siltstones and mudstones, as well as in manganese lateritic crusts and colluvium accumulations. romanechite is the main ore mineral, but manjiroite, lithiophorite, hollandite, vernardite, cryptomelane and pyrolusite are also present. there are two main geochemical associations: 1) for manganesiferous material: a) sr, Au, U, Cu, Pb and Hg as in the Zé Julião occurrence; b) Cao, K2o, Zn, tl, rb, Cd, P2o5 and As in the silva e floresta farms occurrences; c) Mno, ni, Mo, Be, Co, Ga and Eu, in the Beneficente, Cotovelo and Holanda occurrences; 2) for the sedimentary rocks, matrix and soil: d) Y + Etr Eu; e) sio2, Al2o3, tio2, nb, Hf, Zr, fe2o3, sc, th, V. the genesis of the manganese oxy-hydroxides is related to deposition in sedimentary environment and to the subsequent processes of weathering and landscape evolution of the region. |
| Starting Page | 11 |
| Ending Page | 28 |
| Page Count | 18 |
| File Format | PDF HTM / HTML |
| Volume Number | 7 |
| Alternate Webpage(s) | http://scielo.iec.gov.br/pdf/bmpegcn/v7n1/v7n1a02.pdf |
| Language | English |
| Access Restriction | Open |
| Content Type | Text |
| Resource Type | Article |
