Banca de QUALIFICAÇÃO: NADELINE HEVELYN DE LIMA ARAÚJO

Uma banca de QUALIFICAÇÃO de DOUTORADO foi cadastrada pelo programa.
STUDENT : NADELINE HEVELYN DE LIMA ARAÚJO
DATE: 28/05/2024
TIME: 14:00
LOCAL: Google meet
TITLE:

GENESIS OF MARINE TERRACES AND RETREAT OF GLACIERS ON THE BYERS PENINSULA, MARITIME ANTARCTIC

KEY WORDS:

Glacial environment, climate sensitivity, glacier retreat, glacio-eustatics, glacio-isostatics and marine terraces.

PAGES: 69
BIG AREA: Ciências Exatas e da Terra
AREA: Geociências
SUBÁREA: Geografia Física
SPECIALTY: Geomorfologia
SUMMARY:

The glacial environment, as a scenario of high climate sensitivity, is the stage for processes that drastically alter the landscape in a short period of time: retreat of glaciers, changes in precipitation patterns, increase in the duration of the summer period and expansion of ice-free areas. At this juncture, maritime Antarctica, a scenario of high susceptibility to climate change, is subject to isostatic-eustatic fluctuations, which involve an increase in sea level and culminate in the formation of temporal gradients in soil development, representing the horizontal and vertical retreat of glaciers. . These processes translate into features such as cryoplaned surfaces, beaches and marine terraces, which, accumulated over the years, tell the story of the landscape's evolution. The genesis of marine terraces in glacial environments is linked to the interaction of glacio-eustatic and glacio-isostatic processes. On tectonically active coasts, marine terraces are formed by the combined effects of wave erosion, tectonic uplift, and sea level oscillations on glacial cycle timescales. The soils of marine terraces in Byers are sandy, hypereutrophic and with granulometric dominance of the medium sand fraction between their horizons. The profiles have an almost 100% standardized degree of selection, with moderately selected sand fractions, indicating an environment with moderate energy movement, with the exception of P13 (near the Rotch Dome glacier), representing an environment with less energy movement (poorly selected). The soils portrayed several evidences of discontinuities and a Quaternary soil chronosequence, evidencing the existence of several cycles of deglaciation/glaciation and successive isostatic elevations even before the Holocene period, in the late Pleistocene (such as P13 dating from 16,500 cal year BP), resulting in several levels of elevated marine terraces.

COMMITTEE MEMBERS:
Presidente - 1242208 - RODRIGO DE FREITAS AMORIM
Interno - 1172876 - SILVIO BRAZ DE SOUSA
Interno - 350698 - VENERANDO EUSTAQUIO AMARO
Externo à Instituição - JOSE JOAO LELIS LEAL DE SOUZA - UFV