| Texto completo | |
| Autor(es): |
Martins Sallun, Alethea Ernandes
;
Suguio, Kenitiro
Número total de Autores: 2
|
| Tipo de documento: | Artigo Científico |
| Fonte: | Rem: Revista Escola de Minas; v. 61, n. 3, p. 343-356, JUL-SEP 2008. |
| Citações Web of Science: | 1 |
| Resumo | |
Sedimentologic characterization and provenance studies of quaternary colluvial deposits (9 +/- 1 to 980 +/- 100 ky B.P. - dated by luminescence) were based on textural and mineralogical analyses. These deposits occur extensively between Marilia and Presidente Prudente (Sao Paulo State, Brazil), superimposed on the Bauru Group sedimentary rocks or the Serra Geral Formation basaltic rocks, both of Cretaceous age. They are distributed irregularly throughout the study area and are studied by sedimentologic and morphologic methods. These deposits are composed of very fine to coarse-grained unconsolidated sands, mostly constituted by quartzose monocrystalline grains reddened by iron oxide and hydroxide impregnation. Analyses of grain sizes indicated that total granulometric distributions are richer in the clay fraction than in the sedimentary rocks located. Non-micaceous transparent heavy minerals studied microscopically in fine-grained as well as in very fine-grained sands showed that zircon, tourmaline, staurolite and rutile are present in all the samples. Differences in grain sizes among the colluvial deposits and the Bauru Group sedimentary rocks are attributable to pedogenetic processes. (AU) | |
| Processo FAPESP: | 00/10672-6 - Depósitos cenozoicos da região entre Marília e Presidente Prudente, noroeste do estado de São Paulo |
| Beneficiário: | Alethea Ernandes Martins Sallun |
| Modalidade de apoio: | Bolsas no Brasil - Mestrado |
| Processo FAPESP: | 03/01737-5 - Reestudo da Formação Paranavaí |
| Beneficiário: | Alethea Ernandes Martins Sallun |
| Modalidade de apoio: | Bolsas no Brasil - Doutorado |
| Processo FAPESP: | 01/07469-7 - Depositos cenozoicos da regiao entre marilia e presidente prudente noroeste do estado de sao paulo. |
| Beneficiário: | Kenitiro Suguio |
| Modalidade de apoio: | Auxílio à Pesquisa - Regular |