geologia e recursos naturais

Nova Colinas (NC) is a complex-type impact structure located in the northeast region of Brazil. It was formed in the volcano-sedimentary strata of the Parnaíba Basin, in the northern part of Western Gondwana. With an apparent diameter of approximately 6.5–7 km, its rim exhibits a distinctive magnetic signal, likely associated to basic volcanic rocks from the Mosquito Formation. These rocks present shock deformation, bracketing the maximum age of the impact event to 197 Ma.

Abstract

Cretaceous and possibly Paleogene strata, originally defined as the Alter do Chão Formation, are extensively exposed in the Amazonas Basin. While theoretical considerations suggest that the eastern Amazon has been draining into the Atlantic since pre-Miocene times, the limited published field data indicate a significant continental-scale reversal of drainage, transitioning from westward flow during the Cretaceous to the current eastward regional flow.

Impactos meteoríticos são um raro tipo de processo geológico que, por suas características extremas de pressão e temperatura, são capazes de promover transformações permanentes em rochas crustais. As marcas resultantes são as estruturas denominadas “crateras de impacto”. Com o passar do tempo as crateras são geralmente modificadas por processos erosivos, tectônicos e sedimentares característicos da dinâmica geológica da Terra, até serem completamente removidas da sua superfície.

Abstract

Sunken oil mats (SOMs) pose a significant threat to marine ecosystems, yet their long-term fate and weathering processes remain poorly understood. This study investigates the degradation of biomarkers in a SOM sample collected from the Brazilian coast following the long-lasting 2019 oil spill. The SOM clearly distinguished from spilt oil and were attributed to tanker-washing residues.

Abstract

The high risk of environmental contamination posed by the use of petroleum hydrocarbons (HCs) necessitates technologies for detecting leaks. The effectiveness of sensors operating in near infrared (NIR) and short wave (SWIR) have already been demonstrated for this purpose. However, the applicability of thermal data (TIR) remains largely unexplored. This study aims to evaluate the applicability of TIR data for the detection and monitoring of soils contaminated with HCs, by tracking changes in the emissivity of samples in the post-contamination period.

Abstract