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Clay minerals genesis in Brazilian mangrove soils

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Author(s):
Gabriel Ramatis Pugliese Andrade
Total Authors: 1
Document type: Doctoral Thesis
Press: Piracicaba.
Institution: Universidade de São Paulo (USP). Escola Superior de Agricultura Luiz de Queiroz (ESALA/BC)
Defense date:
Examining board members:
Pablo Vidal Torrado; Antonio Carlos Saraiva da Costa; Tiago Osorio Ferreira; Jose Marques Junior; Valdomiro Severino de Souza Júnior
Advisor: Pablo Vidal Torrado
Abstract

Clay minerals are ubiquitous components in < 2 &mu;m size fraction of soils, having an important role in the control of geochemical processes and soil genesis. Despite of the general characterizations performed in Brazilian mangroves soils there is a lack of a detailed crystal chemical study able to evidence mechanisms of formation/transformation of such minerals. This study aims (by two different comparative works) to enhance the crystal chemical characterization of mineral phases in the 2-0,2 &mu;m and < 0,2 &mu;m size fractions of mangrove soils, suggesting the existence of mineral transformation involving clay phases and comprehending what environmental settings are related to these transformations. This characterization is based on XRD modelling of oriented patterns, peak fitting of 060 peaks in randomly XRD patterns, Mössbauer spectroscopy, thermal analysis, chemical analysis of soil pore water and geochemical modelling of inorganic soluble compounds. The results, which are described in chapters 2 and 3 indicate a sequence of mineral transformations, via mixed-layered clays, which may have important consequences for the comprehension of soil genesis processes involving clay minerals, their role in the biogeochemical cycles of structural elements of clays and a straight relationship with biotic components of mangrove ecosystem. (AU)

FAPESP's process: 11/13924-0 - Genesis and characterization of clay minerals from mangrove soils of Brazilian coast
Grantee:Gabriel Ramatis Pugliese Andrade
Support Opportunities: Scholarships in Brazil - Doctorate