The results of the palynological study of the samples from the core, performed in the Aguas Claras peatland, RS, Brazil (50°45′00″W, 30°00′15″S), focus on detailed taxonomic analysis of non-pollen palynomorphs (NPPs) and palynofacies from the Holocene peat and underline the Late Pleistocene mud and sandy mud that were represented. NPPs from the samples revealed taxonomic variety of fungal palynomorphs, presented by Brachysporium, Clastesporium, Dicellaesporites, Dicellaeporisporites, Gelasinospora, Glomus, Sordaria, Helicoon, and others. The habitats of above mentioned taxa are varied: aquatic, mycorrhizal, parasitic, organic matter decaying, and dung-coprophilous. Freshwater algal palynomorphs were composed of Botryococcus, Closterium, Debarya, Mougeotia, Pseudoschizaea, Spirogyra, and Zygnema. The percentage ratio between algal and fungal palynomorphs was changed from the different samples of the core, reflecting climatic oscillations (more humid-dryer). Prevalence of fungal palynomorphs was connected with dryer climate, and on the contrary, freshwater algal palynomorph predominance was related with increasing humidity. The six palynomorph zones that corresponded to the six principal phases of environmental and climatic changes were determined. The zone from the uppermost part of peat was characterized by relatively frequent dungcoprophilous and parasitic fungi, as a result of agricultural and domestic activities. Palynofacies analysis combined to NPPs was used for palaeoenvironmental and paleoclimatic reconstructions. Palynofacies from the samples were characterized by evident changes in relationship (%) between the different types of organic matter, their quality, and quantity and fluorescence index. The obtained data contribute to the understanding of the peat deposition. The combined use of NPPs and palynofacies analyses provided a valuable approach for the paleoenvironmental and paleoclimatic reconstructions.
Geociências Geosciences Classificação internacional do carvão (CEE-NU) da Camada Inferior, Mina do Leão, RS, Brasil Application of the international in-seam coal classification for the Camada Inferior, Leão Mine, RS, Brazil ResumoA aplicação de normas internacionais na classificação de carvões sul-brasileiros tem sido alvo de ampla discussão por causa da dificuldade de se obter uma perfeita correlação entre os diferentes parâmetros empregados, sobretudo na relação entre o poder refletor da vitrinita com outros parâmetros químicos, como o carbono e a matéria volátil. A Comissão Econômica para a Europa das Nações Unidas (CEE-NU) desenvolveu normas criteriosas para a classificação de carvões, tendo como base o uso simultâneo das três principais características dos carvões: composição, rank e grade, que devem ser consideradas simultaneamente, incluindo, também, análises suplementares como a determinação do poder calorífico superior, da umidade total da camada, do índice de inchamento (FSI) e análise elementar. Com a finalidade de se classificar o carvão da principal camada atualmente explotada na Mina do Leão pelas normas aprovadas pela CEE-NU, amostras foram coletadas e submetidas às análises petrográ-ficas, imediatas, da umidade total e do poder calorífico superior. As camadas de carvão ocorrem na Formação Rio Bonito, Permiano (Artinskiano-Kunguriano), da bacia do Paraná. Com base nos resultados, o carvão da Camada Inferior do Leão pode ser classificado como carvão parabetuminoso (ou de grau médio D), conforme normas da Classificação Internacional da CEE-NU. Os resultados foram ainda comparados com dados de trabalhos anteriores com enfoque na avaliação do rank do carvão. Palavras
O desenvolvimento da monitoria de geoquímica orgânica e geoquímica do petróleo no avanço da aprendizagem do graduando em engenharia de petróleo da UFPEL The development of the monitoring of organic geochemistry and petrochemical geochemistry in the advance of the learning of graduates in petroleum engineering of UFPEL
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.
hi@scite.ai
10624 S. Eastern Ave., Ste. A-614
Henderson, NV 89052, USA
Copyright © 2024 scite LLC. All rights reserved.
Made with 💙 for researchers
Part of the Research Solutions Family.