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• W1992495596 abstract "Preliminary results are presented on a comparative study of two Permian coal-bearing successions in the Paraná Basin of Brazil and in the Rukwa Basin of Tanzania. The sedimentary fill of the intra-cratonic Paraná Basin of Brazil was controlled by eustatic-tectonic events, which are reflected in the coal-bearing Early Permian succession by four third-order depositional sequences. In Tanzania, coal-bearing strata formed in small disconnected graben structures associated with the East African Rift System. Comparison of the stratigraphy of the two basins suggests that Early Permian tectonic activity was Gondwana-wide, as evidenced by a major unconformity at the top of the Idusi and Itararé formations. Palynomorph assemblages in the two basins are similar and suggest that the Scheuringipollenites and Scheuringipollenites/Protohaploxypinus assemblages (K2 interval) from Tanzania are correlative with the Caheniasaccites ovatus Sub-zone of Brazil. The age for the coal-bearing strata is Artinskian to Kungarian(?). Many coal seams in the two basins have common compositional features, such as high inertinite and mineral matter contents. Based on facies critical macerals and derived ratios (Tissue Preservation Index, Gelification Index) a lower delta plain/back barrier depositional setting is suggested for the Paraná Basin coals in the southern area, whereas compositional data for the coals in the Rukwa Basin of Tanzania suggest coal formation in an upper delta plain depositional setting. Nous présentons les résultats préliminaires de l'étude comparative de deux séquences permiennes à charbon du Bassin du Paraná (Brésil) et du Bassin de Rukwa (Tanzanie). Le remplissage sédimentaire du bassin intra-cratonique du Paraná (Brésil) a été contrôlé par des événements eustatiques et tectoniques, ce qui se reflète dans la succession à charbon du Permien inférieur par quatre séquences de dépôt du troisième ordre. En Tanzanie, les strates à charbon se sont formées dans de petites structures en graben déconnectées et associées au systéme du Rift Est Africain. La comparaison de la stratigraphie des deux bassins suggère que l'activité tectonique du Permien inférieur était à l'échelle du gondwana, comme le montre la discordance majeure au sommet des formations d'ldusi et d'ltararé. Les associations palynomorphes semblables des deux bassins suggèrent que les assemblages de Tanzanie àScheuringipollinites et Scheuringipollinites/Protohaploxypinus (intervalle K2) se corrèlent avec la Sous-Zone du Brésil àCaheniasaccites ovatus. L'âge des niveaux à charbon est Artinskien à Kungarien(?). Beaucoup de couches de charbon des deux bassins ont des caractères de composition communes, comme les fortes teneurs en inertinite et en matière organique. D'après les faciès, les minéraux critiques et les rapports dérivés (Indice de Préservation des Tissus, Indice de Gélification), les charbons du Bassin du Paraná se sont déposés dans un environnement de zone inférieure d'une plaine de delta/barrière, alors que ceux du Bassin de Rukwa en Tanzanie se sont formés dans un environnement de dépôt de zone supérieure de plaine de delta." @default.
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• W1992495596 date "1999-07-01" @default.
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• W1992495596 title "A comparative study of the geology, petrology and palynology of Permian coals in Tanzania and southern Brazil" @default.
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• W1992495596 doi "https://doi.org/10.1016/s0899-5362(99)00082-2" @default.
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