Busca avançada
Ano de início
Entree
(Referência obtida automaticamente do Web of Science, por meio da informação sobre o financiamento pela FAPESP e o número do processo correspondente, incluída na publicação pelos autores.)

The mineralogy of paleosols in the Marilia Formation and their importance in the environmental evolution of the Maastrichtian of the Bauru Basin in southeastern Brazil

Texto completo
Autor(es):
da Silva, Marcio Luiz [1] ; Batezelli, Alessandro [2] ; Bernardes Ladeira, Francisco Sergio [3]
Número total de Autores: 3
Afiliação do(s) autor(es):
[1] Inst Fed Educ Ciencia & Tecnol Sul Minas IFSULDEM, Inconfidentes, MG - Brazil
[2] Univ Estadual Campinas, UNICAMP, Geosci Inst IG, Dept Geol & Nat Resources DGRN, Campinas, SP - Brazil
[3] Univ Estadual Campinas, Geosci Inst IG, Dept Geog DGEO, Campinas, SP - Brazil
Número total de Afiliações: 3
Tipo de documento: Artigo Científico
Fonte: BRAZILIAN JOURNAL OF GEOLOGY; v. 47, n. 3, p. 403-426, JUL-SEP 2017.
Citações Web of Science: 4
Resumo

Soils and paleosols reflect the complex interplay between sedimentation, erosion and non-deposition. An analysis of the mineralogical components of paleosols is critical for the reconstitution of the factors, processes and environments in which they were formed. The recognition of mineralogical assemblages can reveal the environmental conditions during pedogenesis and through quantitative analysis it is possible to identify a vertical variation in mineral concentration or leaching over the paleosol profiles, indirectly pointing to environmental processes that dominated during the pedogenetic evolution. The objective of this study is to discuss the significance of mineral phases and to quantify the environmental evolution and degree of development of paleosols of the Marilia Formation, Maastrichtian of Bauru Basin. Three sections have been described (A1, A2, A3) in the Marilia Formation. The mineralogy was determined by x-ray diffraction, and mineral quantification was obtained through the Rietveld refinement method. The calcretes of the Marilia Formation are pedogenic, mostly authigenic minerals. The variation of quartz, calcite, palygorskite and smectite, the micromorphology, and the diversity of subsurface horizons (Bkm, Btkm, Bt) indicate that the studied paleosols did develop in semi-arid conditions, with episodes of higher rainfall rates, humidity, leaching and desilication. (AU)

Processo FAPESP: 15/17632-5 - Sedimentação e pedogênese das sequencias continentais Cretáceas das bacias Bauru, Sanfranciscana, Parecis e Neuquén.
Beneficiário:Alessandro Batezelli
Linha de fomento: Auxílio à Pesquisa - Regular