Banca de DEFESA: NADELINE HEVELYN DE LIMA ARAÚJO

Uma banca de DEFESA de DOUTORADO foi cadastrada pelo programa.
STUDENT : NADELINE HEVELYN DE LIMA ARAÚJO
DATE: 27/04/2026
TIME: 09:00
LOCAL: Google meet
TITLE:

Micromorphological and geochemical signatures of soil in the Byers Peninsula, Antarctica

KEY WORDS:

Byers Peninsula, micromorphology, geochemistry, pedogenesis, and climate change

PAGES: 155
BIG AREA: Ciências Exatas e da Terra
AREA: Geociências
SUBÁREA: Geografia Física
SPECIALTY: Geomorfologia
SUMMARY:

Located on Livingston Island, Maritime Antarctica, on the Byers Peninsula, representing the largest ice-free area of the South Shetland archipelago, it possesses great pedological diversity and unique soil development conditions. This research sought to establish rules between microstructure and the physical and chemical properties of the soil in a highly climate-sensitive ecosystem where soils act as proxies in understanding global environmental changes, based on the hypothesis that features at the "micro" scale reveal moderate development in soils traditionally selected as incipient. The methodology integrates routine physicochemical analyses, mineralogy of the sand fraction by X-ray fluorescence (XRF), optically stimulated luminescence (OSL) dating and, primarily, the microscopic description of soil thin sections with preserved structure. The results identified five soil groups (Cryosols, Gleysols, Fluvisols, Cambisols, and Leptosols) distributed across volcanic ridges, cryoplaned surfaces, and marine terraces, exhibiting discontinuous permafrost and horizons marked by cryoturbation and solifluction. The conclusions and findings show that the genesis of the soils and uplifted marine terraces records glacio-isostatic adjustments and active freeze/thaw cycles since the Holocene, revealing that deglaciation and pedogenesis processes in the region are more complex and, in certain areas, older than previously thought, consolidating the Byers Peninsula as a critical indicator of landscape evolution and Antarctic climate regulation.

COMMITTEE MEMBERS:
Presidente - 1242208 - RODRIGO DE FREITAS AMORIM
Interno - 1172876 - SILVIO BRAZ DE SOUSA
Externo ao Programa - 1997952 - DAVI DO VALE LOPES - UFRNExterna à Instituição - CAROLINE DELPUPO SOUZA - IFMG
Externo à Instituição - JOSE JOAO LELIS LEAL DE SOUZA - UFV