Occurrence of chromiferous horizon in the Trincheira Complex, municipality of Corumbiara, southeast of the State of Rondônia, Brazil
The Trincheira Mafic-ultramafic Complex comprises a Mesoproterozoic layered intrusion hosted in metasedimentary rocks of the southwestern portion of the Amazonian Craton. This intrusion has an outcropping area of approximately 35 km2 , however, it has been associated to a larger ellipsoidal magnetic...
| Autores: | , , , , |
|---|---|
| Tipo de recurso: | artículo |
| Estado: | Versión publicada |
| Fecha de publicación: | 2017 |
| País: | Brasil |
| Institución: | Companhia de Pesquisa de Recursos Minerais (CPRM) |
| Repositorio: | Repositório Institucional de Geociências - RIGEO |
| Idioma: | inglés |
| OAI Identifier: | oai:rigeo.sgb.gov.br:doc/18775 |
| Acceso en línea: | https://rigeo.sgb.gov.br/handle/doc/18775 |
| Access Level: | acceso abierto |
| Palabra clave: | INTRUSÕES MÁFICO-ULTRAMÁFICAS ROCHAS CUMULÁTICAS CRÁTON AMAZÔNICO COMPLEXO TRINCHEIRA CORUMBIARA RONDÔNIA MAFIC-ULTRAMAFIC INTRUSIONS CUMULATE ROCKS AMAZONIAN CRATON TRINCHEIRA COMPLEX |
| Sumario: | The Trincheira Mafic-ultramafic Complex comprises a Mesoproterozoic layered intrusion hosted in metasedimentary rocks of the southwestern portion of the Amazonian Craton. This intrusion has an outcropping area of approximately 35 km2 , however, it has been associated to a larger ellipsoidal magnetic anomaly with N-S elongated shape. The Trincheira Complex is com-posed of partially metamorphosed pyroxenites, websterites, gabbros and anorthosites. The complex hosts Cr-rich layers associated to relevant concentrations of Ni. High concentrations of Cu, Co and V have also been detected. Preliminary analysis performed with portable X-ray diffraction indicates up to 13% Cr and occurrence of cochromite, a special variety of chromite enriched in cobalt, nickel and iron, whereas ICP-MS analyses returned concentrations of up to ~3600 ppm Cr. |
|---|