Changes

==Evolutionary Synthesis==

==Evolutionary Synthesis==

The integrated analysis of basin subsidence shows a relationship between the cycles of depositional space creation in intracratonic areas and orogenic episodes. Several orogenic periods and compressive deformation pulses in the active margin of Gondwana were the major controls of accommodation space variation rates. The orogenic apex matches periods of accelerated development of the interior syneclises, and in the absence of orogenic climax records tectonic uplift on a continental scale in the Paraná Basin. As a result, the temporal amplitude of Paraná Basin supersequences are clearly confined by the temporal limits of the different subsidence cycles controlled by Paleozoic orogenies on the Gondwanan margin. Sea level, climate and sediment supply had supporting roles in transgressive-regressive marine cycles, since their deposits do not match the global eustatic oscillations (Sloss, 1990).

The integrated analysis of basin subsidence shows a relationship between the cycles of depositional space creation in intracratonic areas and orogenic episodes. Several orogenic periods and compressive [[deformation]] pulses in the active margin of Gondwana were the major controls of accommodation space variation rates. The orogenic apex matches periods of accelerated development of the interior syneclises, and in the absence of orogenic climax records tectonic uplift on a continental scale in the Paraná Basin. As a result, the temporal amplitude of Paraná Basin supersequences are clearly confined by the temporal limits of the different subsidence cycles controlled by Paleozoic orogenies on the Gondwanan margin. Sea level, climate and sediment supply had supporting roles in transgressive-regressive marine cycles, since their deposits do not match the global eustatic oscillations (Sloss, 1990).

The tectonic-stratigraphic evolution of the Paraná Basin developed in the Gondwanan cratonic interior, which had a convergent relationship with the oceanic lithosphere of Panthalassa (Gondwanides Orogenic Cycle), during the Phanerozoic. This orogenic cycle is marked by two main collisional cycles: Famatinian (Ordovician to Devonian) and Gondwanic ([[Carboniferous]] to Triassic) (Ramos, 1988, 1990). The structure of the Paraná Basin developed in NE-SW elongated depressions, according to the plot of the Precambrian substrate.<ref name=Milani_1997>Milani, E. J., 1997, Evolução tectono-estratigráfica da Bacia do Paraná e seu relacionamento com a geodinâmica fanerozóica do Gondwana sul-ocidental. 2 v. Tese (Doutorado) -  Universidade Federal do Rio Grande do Sul, Porto Alegre</ref> The [[basement]] weakness zones being reactivated under the compressional field, which originated on the continent's edge by the Ocloyic Orogeny (Famatinian)<ref name=Ramos_1986> Ramos, V. A.; Jordan, T. E.; Allmendinger, R. W.; Mpodozis, C.; Kay, J. M.; Cortés, J. M.; Palma, M., 1986, Paleozoic terranes of the central Argentine- Chilean Andes. Tectonics, Washington, v. 5, n. 6, p.855-880</ref>), which provided accommodation space for the of the first unit: the Rio Ivaí supersequence.

The tectonic-stratigraphic evolution of the Paraná Basin developed in the Gondwanan cratonic interior, which had a convergent relationship with the oceanic lithosphere of Panthalassa (Gondwanides Orogenic Cycle), during the Phanerozoic. This orogenic cycle is marked by two main collisional cycles: Famatinian (Ordovician to Devonian) and Gondwanic ([[Carboniferous]] to Triassic) (Ramos, 1988, 1990). The structure of the Paraná Basin developed in NE-SW elongated depressions, according to the plot of the Precambrian substrate.<ref name=Milani_1997>Milani, E. J., 1997, Evolução tectono-estratigráfica da Bacia do Paraná e seu relacionamento com a geodinâmica fanerozóica do Gondwana sul-ocidental. 2 v. Tese (Doutorado) -  Universidade Federal do Rio Grande do Sul, Porto Alegre</ref> The [[basement]] weakness zones being reactivated under the compressional field, which originated on the continent's edge by the Ocloyic Orogeny (Famatinian)<ref name=Ramos_1986> Ramos, V. A.; Jordan, T. E.; Allmendinger, R. W.; Mpodozis, C.; Kay, J. M.; Cortés, J. M.; Palma, M., 1986, Paleozoic terranes of the central Argentine- Chilean Andes. Tectonics, Washington, v. 5, n. 6, p.855-880</ref>), which provided accommodation space for the of the first unit: the Rio Ivaí supersequence.