Illite authigenesis in sandstones of the Guaritas Allogroup (Early Paleozoic): Implications for the depositional age,stratigraphy and evolution of the Camaquã Basin (Southern Brazil) |
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| Authors: | Anderson José Maraschin Ana Maria Mizusaki Horst Zwingmann André Weissheimer de Borba Gesiane Fraga Sbrissa |
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| Institution: | 1. Centro de Excelência em Pesquisa sobre Armazenamento de Carbono (CEPAC), Pontifícia Universidade Católica do Rio Grande do Sul (PUCRS), Av. Ipiranga, 6681 – Porto Alegre (RS), Brazil;2. Instituto de Geociências, Universidade Federal do Rio Grande do Sul (IG/UFRGS), Caixa Postal 15001 – Porto Alegre (RS), Brazil;3. CSIRO Petroleum, P.O. Box 1130, Bentley, WA 6102, Australia;4. Ministério Público do Estado do Rio Grande do Sul, Divisão de Assessoramento Técnico (DAT/MP-RS), Rua Andrade Neves, 106, 10° andar, Porto Alegre (RS), Brazil;5. CNPq Researcher;1. School of Geosciences, China University of Petroleum, 66 Changjiang West Road, Huangdao District, Qingdao, Shandong, 266580, China;2. College of Geosciences, China University of Petroleum, 18 Fuxue Road, Changping District, Beijing, 102249, China;3. College of Geological Science and Engineering, Shandong University of Science and Technology, 579 Qianwangang Road, Huangdao District, Qingdao, Shandong, 266510, China;1. Department of Earth and Planetary Sciences, Harvard University, 20 Oxford Street, Cambridge, MA 02138, USA;2. School of Geography, Earth and Environmental Sciences, University of Birmingham, Edgbaston, Birmingham B15 2TT, UK;3. Department of Earth Sciences, Irvine Building, University of St Andrews, St Andrews, Fife KY16 9AL, UK;4. Department of Organismic and Evolutionary Biology, Harvard University, 26 Oxford Street, Cambridge, MA 02138, USA;1. School of Geosciences, China University of Petroleum, Qingdao, 266580, China;2. Laboratory for Marine Mineral Resources, Qingdao National Laboratory for Marine Science and Technology, Qingdao, 266071, China;3. PetroChina Jidong Oilfield Company, Tangshan 063004, Hebei, China;4. Department of Earth Sciences, Durham University, Durham, DH1 3LE, UK;1. Centro de Pesquisa Manoel Teixeira da Costa, Instituto de Geociências, Universidade Federal de Minas Gerais (CPMTC-IGC-UFMG), Av. Antônio Carlos 6627, CEP 31270-901 Belo Horizonte, MG, Brazil;2. Departamento de Geologia, Escola de Minas, Universidade Federal de Ouro Preto (UFOP), Morro do Cruzeiro, Ouro Preto, MG 35400-000, Brazil;3. NEG-LABISE, Department of Geology, Universidade Federal de Pernambuco, Recife, PE 50740-530, Brazil |
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| Abstract: | Several analytical studies performed on alluvial-eolian sandstones of the Early Paleozoic Guaritas Allogroup (Camaquã Basin, southern Brazil) indicate illite to be abundant, showing different morphologies as authigenic grain rims and pore-bridging filaments. Authigenic illite separates of variable grain sizes from distinct stratigraphic intervals of the Guaritas Allogroup yielded 40K–40Ar ages from 521.7 ± 10.3 to 473.7 ± 9.4 Ma. These ages, interpreted to record the timing of illite authigenesis, are coincident with the age of emplacement of the Rodeio Velho andesites (470 ± 19 Ma). Moreover, field structures suggest interaction between hot, andesite lava flows and wet, poorly consolidated sediments of the Pedra Pintada Alloformation (lower strata of the Guaritas Allogroup). This set of data indicates that the Rodeio Velho volcanism could have been responsible for a widespread remobilization of interstitial fluids and consequent authigenic illite precipitation in the sandstones of the Guaritas Allogroup. |
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