Heavy mineral as a tool to refine the stratigraphy of kaolin deposits in the Rio Capim Area, Northern Brazil
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| Natura: | Artículo científico |
| Lingua: | en |
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Academia Brasileira de Ciências
2007
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| _version_ | 1876429560274223104 |
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| author | Ana Maria Góes |
| author_facet | Ana Maria Góes |
| contents | Heavy mineral as a tool to refine the stratigraphy of kaolin deposits in the Rio Capim Area, Northern Brazil Ana Maria Góes Anderson C. Mendes Dilce F. Rossetti Multidisciplinaria (Ciencias Naturales y Exactas) Basin Cametá Sub heavy minerals kaolin deposits Early Cretaceous Studies of heavy minerals in kaolin deposits from the Ipixuna Formation in the Rio Capim area (Northern Brazil)showed a mature to super mature assemblage dominated by zircon and tourmaline, and subordinately rutile, kyaniteand staurolite. These minerals do not change much throughout the whole section; however, each kaolin unit displaysa particular signature, defined by differences in the proportions of the whole assemblage of heavy minerals, as well asof their textural characteristics. This work revealed that the lower and upper kaolin units can be definitely consideredas distinct depositional sequences. A higher proportion of opaque minerals and higher zircon values characterize thelower unit. The higher volumes of anhedric, rounded to sub-rounded grains of zircon and tourmaline in the upperunit suggests that this includes grains that were undergone to a higher degree of reworking. The increased volumeof unaltered staurolite and kyanite in the upper unit leads to conclude that, even considering sediment reworking, adistinct source must be invoked. The results also show that the characteristics of the heavy mineral assemblage fromthe intermediate unit are comparable with those from the upper unit, which suggests they might record a same stratigraphicsequence. 2007 artículo científico 0001-3765 https://www.redalyc.org/articulo.oa?id=32779309 en http://www.redalyc.org/revista.oa?id=327 Anais da Academia Brasileira de Ciências application/pdf Academia Brasileira de Ciências Anais da Academia Brasileira de Ciências (Brasil) Num.3 Vol.79 |
| format | Artículo científico |
| id | redalyc_32779309 |
| institution | Redalyc |
| language | en |
| publishDate | 2007 |
| publisher | Academia Brasileira de Ciências |
| spellingShingle | Heavy mineral as a tool to refine the stratigraphy of kaolin deposits in the Rio Capim Area, Northern Brazil Ana Maria Góes Multidisciplinaria (Ciencias Naturales y Exactas) Basin Cametá Sub heavy minerals kaolin deposits Early Cretaceous Heavy mineral as a tool to refine the stratigraphy of kaolin deposits in the Rio Capim Area, Northern Brazil Ana Maria Góes Anderson C. Mendes Dilce F. Rossetti Multidisciplinaria (Ciencias Naturales y Exactas) Basin Cametá Sub heavy minerals kaolin deposits Early Cretaceous Studies of heavy minerals in kaolin deposits from the Ipixuna Formation in the Rio Capim area (Northern Brazil)showed a mature to super mature assemblage dominated by zircon and tourmaline, and subordinately rutile, kyaniteand staurolite. These minerals do not change much throughout the whole section; however, each kaolin unit displaysa particular signature, defined by differences in the proportions of the whole assemblage of heavy minerals, as well asof their textural characteristics. This work revealed that the lower and upper kaolin units can be definitely consideredas distinct depositional sequences. A higher proportion of opaque minerals and higher zircon values characterize thelower unit. The higher volumes of anhedric, rounded to sub-rounded grains of zircon and tourmaline in the upperunit suggests that this includes grains that were undergone to a higher degree of reworking. The increased volumeof unaltered staurolite and kyanite in the upper unit leads to conclude that, even considering sediment reworking, adistinct source must be invoked. The results also show that the characteristics of the heavy mineral assemblage fromthe intermediate unit are comparable with those from the upper unit, which suggests they might record a same stratigraphicsequence. 2007 artículo científico 0001-3765 https://www.redalyc.org/articulo.oa?id=32779309 en http://www.redalyc.org/revista.oa?id=327 Anais da Academia Brasileira de Ciências application/pdf Academia Brasileira de Ciências Anais da Academia Brasileira de Ciências (Brasil) Num.3 Vol.79 |
| title | Heavy mineral as a tool to refine the stratigraphy of kaolin deposits in the Rio Capim Area, Northern Brazil |
| topic | Multidisciplinaria (Ciencias Naturales y Exactas) Basin Cametá Sub heavy minerals kaolin deposits Early Cretaceous |
| url | https://www.redalyc.org/articulo.oa?id=32779309 |