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dc.contributor.author
Warren, L. V.
dc.contributor.author
Freitas, B. T.
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Riccomini, C.
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Boggiani, P. C.
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Quaglio, F.
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Simões, M. G.
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Fairchild, T. R.
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Giorgioni, M.
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Gaucher, C.
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Poire, Daniel Gustavo
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Cáceres, A. A.
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Sial, A. N.
dc.date.available
2020-01-08T20:26:04Z
dc.date.issued
2019-03
dc.identifier.citation
Warren, L. V.; Freitas, B. T.; Riccomini, C.; Boggiani, P. C.; Quaglio, F.; et al.; Sedimentary evolution and tectonic setting of the Itapucumi Group, Ediacaran, northern Paraguay: From Rodinia break-up to West Gondwana amalgamation; Elsevier Science; Precambrian Research; 322; 3-2019; 99-121
dc.identifier.issn
0301-9268
dc.identifier.uri
http://hdl.handle.net/11336/94012
dc.description.abstract
The Itapucumi Group is recognized worldwide due to its well-preserved Ediacaran fossil assemblage. Despite its paleontological importance, this unit remains as the least studied South American Neoproterozoic sedimentary succession. Recorded at northern Paraguay, the Itapucumi Group is a ∼400 m-thick siliciclastic and carbonate succession deposited on the Paleoproterozoic basement of the Rio Apa Craton. At west, this unit is deformed and metamorphosed, whereas the eastern domain constitutes an undeformed cratonic cover. The Itapucumi Group comprises, from base to top, siliciclastic rocks of the Vallemi Formation, succeeded by limestones and dolomites of the Camba Jhopo and Tagatiya Guazu formations, which are capped by marls and mudstones of the Cerro Curuzu Formation. The entire sedimentary succession consists of three depositional sequences deposited in a large rimmed carbonate platform open to the ocean westward: S.1, the lowermost predominantly terrigenous, and sequences S.2 and S.3, comprising carbonate and terrigenous facies associations. Carbon isotope data from limestones and dolostones show values of +1.93‰ δC 13 VPDB and 87 Sr/ 86 Sr ratios of 0.7084 and 0.7089, in agreement with a depositional age between 600 Ma and 550 Ma and coherent with the Cloudina biozone. These data support the paleogeographic correlation between the Itapucumi and Corumbá groups at the margins of the Amazonian and Rio Apa Craton. The siliciclastic basal successions of both units, are interpreted as deposited in rift basins developed during the fragmentation of the Rodinia supercontinent (Cryogenian to Ediacaran). Later thermal subsidence led to the generation of a new accommodation space around 550 and 528 Ma, recording extensive carbonate platforms along the margins of Pampia, Amazonian and Rio Apa cratons. The deformation of the Itapucumi and Corumbá basins started at around 528 Ma, and was controlled by the reactivation of listric and normal faults generated during the rift stage. The opposite tectonic vergence observed in the Vallemi and Paraguay fold-and-thrust belts can be ascribed to oppose master fault polarities in the precursor basins of this context, as well as to the rigid behavior of the Rio Apa Craton. The compressional phase ended around 484 Ma, and corresponding to the last stresses related to the Brasiliano Cycle and the closure of SW Gondwana.
dc.format
application/pdf
dc.language.iso
eng
dc.publisher
Elsevier Science
dc.rights
info:eu-repo/semantics/restrictedAccess
dc.rights.uri
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
dc.subject
BASIN EVOLUTION
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C AND O ISOTOPES
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EDIACARAN FAUNA
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NEOPROTEROZOIC
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RIO APA CRATON SEDIMENTARY COVER
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SR DATA
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STRATIGRAPHY
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SW GONDWANA
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Geociencias multidisciplinaria
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Ciencias de la Tierra y relacionadas con el Medio Ambiente
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CIENCIAS NATURALES Y EXACTAS
dc.title
Sedimentary evolution and tectonic setting of the Itapucumi Group, Ediacaran, northern Paraguay: From Rodinia break-up to West Gondwana amalgamation
dc.type
info:eu-repo/semantics/article
dc.type
info:ar-repo/semantics/artículo
dc.type
info:eu-repo/semantics/publishedVersion
dc.date.updated
2019-12-11T18:54:36Z
dc.journal.volume
322
dc.journal.pagination
99-121
dc.journal.pais
Países Bajos
dc.journal.ciudad
Amsterdam
dc.description.fil
Fil: Warren, L. V.. Universidade Estadual Paulista Julio de Mesquita Filho; Brasil
dc.description.fil
Fil: Freitas, B. T.. Universidade Estadual de Campinas; Brasil
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Fil: Riccomini, C.. Universidade de Sao Paulo; Brasil
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Fil: Boggiani, P. C.. Universidade de Sao Paulo; Brasil
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Fil: Quaglio, F.. Universidade Federal de Sao Paulo; Brasil
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Fil: Simões, M. G.. Universidade Estadual Paulista Julio de Mesquita Filho; Brasil
dc.description.fil
Fil: Fairchild, T. R.. Universidade de Sao Paulo; Brasil
dc.description.fil
Fil: Giorgioni, M.. Universidade do Brasília; Brasil
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Fil: Gaucher, C.. Universidad de la República; Uruguay
dc.description.fil
Fil: Poire, Daniel Gustavo. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata. Centro de Investigaciones Geológicas. Universidad Nacional de La Plata. Facultad de Ciencias Naturales y Museo. Centro de Investigaciones Geológicas; Argentina
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Fil: Cáceres, A. A.. Universidade de Sao Paulo; Brasil
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Fil: Sial, A. N.. Universidade Federal de Pernambuco; Brasil
dc.journal.title
Precambrian Research
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/doi/http://dx.doi.org/10.1016/j.precamres.2018.12.022
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/url/https://www.sciencedirect.com/science/article/pii/S030192681830158X
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