Pedodiagenetic Characterization of Cretaceous Paleosols in Southwest Minas Gerais, Brazil

Autor(es)

do Nascimento, Diego Luciano ; Bernardes Ladeira, Francisco Sergio ; Batezelli, Alessandro

• Tipo de documento: Artigo Científico
• Fonte: Revista Brasileira de Ciência do Solo; v. 41, 2017.
• Citações Web of Science: 5

Resumo

ABSTRACT The influence of post-burial geological processes on preserving pedogenic properties has great importance in identifying ancient paleosols both in the field and in a laboratory. However there are not many publications that focus on characterizing paleosol diagenesis. As temperature and pressure progressively increase, evidence of pedogenesis is modified and destroyed, hindering paleoenvironment characterization and interpretation. This paper discusses diagenetic evidence and its relation to strictly pedogenic features, like structure, cements, nodules, and neoformation of clay minerals using the carbonate paleosols of the Marília Formation in the upper unit of the Bauru Basin as a case study. Despite the long geotectonic and thermal history of the Marília Fomation, paleosols bring us pedogenic evidence that can undergo micromorphological analyses, such as cementation, clay illuviation, bioturbation, and ped structures. The results of analyses in 25 paleopedogenic horizons indicate that the paleotopographic features were responsible for distribution of the diagenetic processes and preservation of the paleosol properties. The maturity of those paleosols controls lithification. In mature paleosols that developed in more stable portions of the landscape, characteristics such as carbonate cementation and development of pedogenic structures are the main factors that inhibit diagenesis. However diagenetic processes that influence poorly-developed paleosols are controlled by depositional characteristics and by changes in the water table, enabling more advanced diagenetic processes, compared to mature paleosols. (AU)

• Processo FAPESP: 10/19787-2 - Correlação estratigráfica e paleogeografia do Cretáceo Superior nas bacias Bauru, Sanfranciscana e dos Parecis
• Beneficiário: Alessandro Batezelli
• Modalidade de apoio: Auxílio à Pesquisa - Regular
• Processo FAPESP: 14/05161-5 - Evolução paleopedogenética da Formação Marília (Grupo Bauru - Ks) na região de Campina Verde (MG)
• Beneficiário: Diego Luciano do Nascimento
• Modalidade de apoio: Bolsas no Brasil - Iniciação Científica