Tectônica e sedimentação do Grupo Itapucumi (Ediacarano, Paraguai Setentrional)

Abstract

Anexo 02 Artigo submetido para o periódico Terra Nova intitulado "First ocurrence of in situ Cloudina, thrombolites, and possible soft-bodied organisms in Ediacaran sediments (Itapucumi Group, Paraguay)." Anexo 03 Tabela de estações de coleta de dados de campo Anexo 04 Mapa de estações de coleta de dados de campo a fase rifte como falhas inversas de baixo ângulo com vergência oposta. O término do evento deformacional possivelmente se deu há 484Ma, já adentrando o Período Ordoviciano inferior.

Correlations of some Neoproterozoic carbonate-dominated successions in South America based on high-resolution chemostratigraphy

“…8). The Itapucumí carbonate succession yielded positive δ 13 C values, ranging from +0.2 to +3.8‰ Warren 2011 Therefore, paleontological, stratigraphical, and isotopic data support the correspondence between the Itapucumí and Corumbá groups, confirming their coeval evolution (Fig. 9).…”

“…These basal layers are composed of immature sandstones interbedded with basalts, covered by an expressive sequence of red beds. This succession is followed by ooid grainstones, microbialites, and dolostones of the Camba Jhopo and Tagatiyá Guazú formations, and capped by dolostones, marls, and pelites of the Cerro Curuzú Formation Warren 2011). Close to the Paraguay River, this unit has been metamorphosed in the lower-greenschist facies cratonic cover comprised by lagoonal facies deposited in inter-to supratidal context, associated with laminated microbialites and thrombolites containing Cloudina sp., Corumbella werneri, and simple ichnofossils (Boggiani & Gaucher, 2004;Warren et al 2011Warren et al , 2012.…”

“…Close to the Paraguay River, this unit has been metamorphosed in the lower-greenschist facies cratonic cover comprised by lagoonal facies deposited in inter-to supratidal context, associated with laminated microbialites and thrombolites containing Cloudina sp., Corumbella werneri, and simple ichnofossils (Boggiani & Gaucher, 2004;Warren et al 2011Warren et al , 2012. Covering these successions there are pelites, marls, and grainstones of the Cerro Curuzú Formation representing deep-shelf depositional systems with siliciclastic contribution Warren 2011). The stratigraphic architecture of the Itapucumí Group successions is similar to that described for the Corumbá Group which is formed by siliciclastic deposits of the Cerradinho, Cadieus, and Puga formations at the base, overlain by carbonate rocks of the Bocaina and Tamengo formations, and pelitic sediments of the Guaicurus Formation at the top.…”

“…9). The divergent patterns of tectonic vergence between these two belts could be, perhaps, explained by having the Rio Apa Block acting as a rigid barrier during a Cambrian orogenic event related with the final closure of the Clymene Ocean (Warren 2011;Campanha et al 2010). Alternatively, it could represent a different unit altogether (Poiré, 2014).…”

Análises estatísticas de Cloudina spp. no sul da faixa Paraguai e Namíbia. E suas implicações filogenéticas e evolutivas.

“…Localização da área de proveniência das amostras evidenciando a faixa de afloramentos do Grupo Itapucumí. Fonte Warren, 2011. 26 O Grupo Itapucumí localiza-se na Bacia Hidrográfica do Rio Paraguai, na porção paraguaia pertencente à Sub-Bacia do Rio Apa. Do ponto de vista geomorfológico, a área encontra-se na macrounidade dos Depósitos Sedimentares Interioranos Neógenos (IBGE 2006), regionalmente conhecida como Pantanais Sul Mato-grossenses ou mais especificamente, como região do Pantanal do Apa (Alvarenga et al 1982).…”