Diamonds from the Santo Antônio River (Delfinópolis, Minas Gerais): probable relationship with the Canastra-3 Kimberlite
| Autor: | João Paulo de Paula Caldas, Mario Luiz de Sá Carneiro Chaves, Kerley Wanderson Andrade, Maria Silvia Carvalho Barbosa |
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| Jazyk: | angličtina |
| Rok vydání: | 2020 |
| Předmět: |
geography
geography.geographical_feature_category Mining engineering. Metallurgy General Engineering Drainage basin Geochemistry TN1-997 geophysical prospection Engineering (General). Civil engineering (General) Canastra-3 Kimberlite Original data Santo Antônio River diamond General Earth and Planetary Sciences Euler deconvolution Alluvium TA1-2040 Magnetic anomaly Hydrography Kimberlite Geology São Francisco Craton General Environmental Science |
| Zdroj: | REM-International Engineering Journal v.73 n.1 2020 REM-International Engineering Journal Fundação Gorceix (FG) instacron:FG REM: International Engineering Journal, Vol 73, Iss 1, Pp 51-58 (2019) REM-International Engineering Journal, Volume: 73, Issue: 1, Pages: 51-58, Published: 20 DEC 2019 |
| Popis: | The study identifies the Canastra-3 Kimberlite magnetic anomaly as the likely primary source of the alluvial diamonds recovered by "garimpeiros" in the Santo Antonio River basin (Delfinopolis, southwestern Minas Gerais). This conclusion is based on cumulative geophysical, hydrographic, metallogenical and mineral geochemistry evidences. The study area is located within fertile ground in the border of the Sao Francisco craton, close to other diamond primary sources and secondary deposits. This kimberlitic target is the only known in the Santo Antonio River basin. In addition, the known mineralized gravels of this river, worked in the past by "garimpeiros", have evidence of a short transport (angular pebbles and blocks), further evidence of a nearby source. The original data collected in the "Minas Gerais Aerogeophysical Survey Program" was processed and analyzed with the Euler Deconvolution method, implemented in software Oasis Montaj. With the exception of the Canastra-3 body anomaly, all others in the study were classified as non-kimberlitic. Recent sampling work on the weathered top of the Canastra-3 Kimberlite recovered indicator minerals, notably a high proportion of pyrope garnets of the G-10 type, which is unusual among the kimberlites of the region. |
| Databáze: | OpenAIRE |
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