Banca de QUALIFICAÇÃO: PATRICIA REIS ALENCAR OLIVEIRA

Uma banca de QUALIFICAÇÃO de DOUTORADO foi cadastrada pelo programa.
STUDENT : PATRICIA REIS ALENCAR OLIVEIRA
DATE: 24/07/2023
TIME: 09:00
LOCAL: Videoconferência / Canal Youtube PPGG
TITLE:

Morpho-structure of Mid-Ocean Ridge between latitudes 12°42’ N and 10° 51’N

KEY WORDS:

Oceanic ridges, multibeam bathymetry, and morphotectonics.

PAGES: 40
BIG AREA: Ciências Exatas e da Terra
AREA: Geociências
SUMMARY:

The Mid-Atlantic Ridge is a complex geotectonic region that plays a fundamental role in understanding the evolution of oceanic crust and processes associated with divergent plate tectonics. This study presents an important contribution to the understanding of the formation and evolution processes of the ridge segments between the Marathon and Vema Fracture Zones. Using multibeam bathymetry techniques and seismicity data, faulting and peculiar features were identified, resulting in the compartmentalization of the ridge into two distinct tectonic domains. In the 12° N morphotectonic domain, higher magmatic activity was observed, with the presence of isolated and overlapping volcanoes, primarily in the central part of the valley floor, along with a more symmetric ridge. On the other hand, in the 11° N morphotectonic domain, lower magmatic activity and a progressive increase in tectonic control towards the south were recorded. The presence of two second-order discontinuities, represented by basins and oblique lineaments, indicates significant tectonic activity in this domain, revealing a distinct evolutionary stage compared to the 12° N morphotectonic domain, where asymmetry and detachment faults prevail. In addition to first and second-order discontinuities, ridge segments and basins were identified, which significantly contribute to understanding this poorly studied area. Thus, this study provides important information about the geological evolution of the Mid-Atlantic Ridge, contributing to a more comprehensive understanding of the processes that shaped the oceanic crust and the dynamics of divergent tectonic plates in this region.

COMMITTEE MEMBERS:
Externo à Instituição - DAVID LINO VASCONCELOS - UFCG
Presidente - 2042405 - MOAB PRAXEDES GOMES
Externa à Instituição - NARELLE MAIA DE ALMEIDA - UFC