Banca de DEFESA: JÚLIA STEFANE DA SILVA VIEIRA

Uma banca de DEFESA de MESTRADO foi cadastrada pelo programa.
STUDENT : JÚLIA STEFANE DA SILVA VIEIRA
DATE: 28/02/2023
TIME: 16:00
LOCAL: Web conferência
TITLE:

MORPHOSTRUCTURAL AND GEOMORPHOMETRIC ANALYSIS IN Escarpment of the PASSIVE MARGIN OF THE EASTERN NORTHEAST OF BRAZIL

KEY WORDS:

Evolution of passive margins; Post-rift control; Escarpment Dynamics;Jatobá BasinSouthernBorder; Massif of Mata Grande

PAGES: 99
BIG AREA: Ciências Humanas
AREA: Geografia
SUMMARY:

Considering the Eastern Northeast as a vast scenario of morphostructural domains linked to the post-rift evolution
of the opening of the South Atlantic and to possible Cenozoic tectonic pulses, a conspicuous example is theJatobá
Sedimentary BasinSouthernBorder, where the presence of blocks raised above the regional summit, which equal
their topographical quotas (or even exceed them), adjacent crystalline massifs and anomalies linked to local fluvial
patterns. Thus, this work proposed the investigation of the post-rift topographical evolution mechanisms acting in
the area, from morphostructural conditions and evidences in the drainage, using morphological and morphometric
parameters, taking, for comparative purposes of the evolution of the landscape in the short term, the summit
surfaces of the sedimentary Plateau of Jatobá/PE and of the Massif of Mata Grande/AL, having as sector of interest
their respective escapes. From the application of sinuosity indexes of the mountain front (SFM), slope index ofthe
normalized channel (kSN), Hypsometric Integral (IH), Ratio Depth/Height of Valley (RFAV) and by the extraction
of relief lineaments, observed the presence of anomalies in drainage patterns (such asknickpointsand rectilinear
patterns) and relief compartments (such as plateau ruptures and alignment with the main regional structural trends
of preferential NW-SE direction), corroborating the hypothesis that Cenozoic tectonic movements , by the
maintenance of erosive escarpments on sedimentary plateaus whose topographic levels are similar to crystalline
plateaus, on the same raised surface in a context of passive margin. The results allowed the visualization of possible
structural control in the area–especially in the sedimentary sector–since there, thelowest valuesof the indices
used were concentrated, higher density of lineaments, anomalies in the drainage network and concordances
between patterns of channels and main structural trends (mainly in the NE-SW and NW-SE directions) of the area,
reinforcing the hypothesis of post-rift reactivations, responsible for the lifting of sedimentary blocks and older
deposits, above the regional somital summit.

BANKING MEMBERS:
Externo(a) à Instituição - DRIELLY NAAMA FONSÊCA DA SILVA - UFPE
Presidente - 1891214 - KLEYTHON DE ARAUJO MONTEIRO
Interno(a) - 1574934 - NIVANEIDE ALVES DE MELO FALCAO