The paleoclimatic record of Juréia Paleolagoon, coastal southeastern Brazil, includes cyclic and gradual changes with different intensities and frequencies through geological time, and it is controlled by astronomical, geophysical, and geological phenomena. These variations are not due to one single cause, but they result from the interaction of several factors, which act at different temporal and spatial scales. Here, we describe paleoenvironmental evidence regarding climatic and sea level changes from the last 9400 cal yr BP at the Juréia Paleolagoon – one of the main groups of protected South Atlantic ecosystems. Geochemical evidences were used to identify anomalies from multi-proxy analyses of a paleolagoon sediment core. The anomalies of centennial scale were correlated to climate and transgression–regression cycles from the Holocene period. Decadal scale anomalous oscillations in the Quaternary paleolagoon sediments occur between 9400 and 7500 cal yr BP, correlated with long- and short-term natural events, which generated high sedimentation rates, mainly between 8385 and 8375 cal yr BP (10 cm/yr). Our results suggest that a modern-day short-duration North Atlantic climatic event, such as the 8.2 ka event, could affect the environmental equilibrium in South America and intensify the South American Summer Monsoon.
An inventory of geological sites based on solid and clear criteria is a first step for any geoconservation strategy. This paper describes the method used in the geoheritage inventory of the State of São Paulo, Brazil, and presents its main results. This inventory developed by the geoscientific community aimed to identify geosites with scientific value in the whole state, using a systematic approach. All 142 geosites representative of 11 geological frameworks were characterised and quantitatively evaluated according to their scientific value and risk of degradation, in order to establish priorities for their future management. An online database of the inventory is under construction, which will be available to be easily consulted and updated by the geoscientific community. All data were made available to the State Geological Institute as the backbone for the implementation of a future state geoconservation strategy.
Resumo As argilas da Formação Conunhataí, unidade Ncopermiana da Bacia do Paraná, s. 10 consideradas atualmentc a maior fonte de matéria-prima para o sctor de revestimento cerâmico do país. O presente trabalho teve como objetivo principal, aplicar o conceito de fácics aliado à caracterização mineralógica, química e cerâmica, visando lima nova estratégia para exploração. De acordo com os estudos realizados, foram reconhecidas cinco litofácies (Maciça, laminada, Intercalada I, Intercalada II e Alterada), sendo que estas to ram agrupadas em duas grandes Associações (Associação Siltito Argiloso e Associação Siltito Arenoso); estas associações foram plotadas em mapa na escala I:50.000. Com aplicação desta metodologia é possível melhorar o controle da matéria-prima, reduzindo os custos e perdas, e garantindo um produto de melhor qualidade. A aplicação da gcocstatística por meio da análise da Supcrflcic de Tendência foi importante no tratamento dos dados de caracterização cerâmica e química, pois, com os mapas obtidos, foi possível definir áreas mais favoráveis para a implantação de futuras minas.
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