Sedimentary evolution and tectonic setting of the Itapucumi Group, Ediacaran, northern Paraguay: From Rodinia break-up to West Gondwana amalgamation
Main Author: | |
---|---|
Publication Date: | 2019 |
Other Authors: | , , , , , , , , , , |
Format: | Article |
Language: | eng |
Source: | Repositório Institucional da UNESP |
Download full: | http://dx.doi.org/10.1016/j.precamres.2018.12.022 http://hdl.handle.net/11449/185431 |
Summary: | 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 similar to 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 parts per thousand delta C-13 VPDB and Sr-87/Sr-86 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 Corumba 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 Corumba 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. |
id |
UNSP_8cdbac73c99f13c0cb6f860189f14a3d |
---|---|
oai_identifier_str |
oai:repositorio.unesp.br:11449/185431 |
network_acronym_str |
UNSP |
network_name_str |
Repositório Institucional da UNESP |
repository_id_str |
2946 |
spelling |
Sedimentary evolution and tectonic setting of the Itapucumi Group, Ediacaran, northern Paraguay: From Rodinia break-up to West Gondwana amalgamationStratigraphyC and O isotopesSr dataEdiacaran faunaBasin evolutionRio Apa Craton sedimentary coverNeoproterozoicSW GondwanaThe 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 similar to 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 parts per thousand delta C-13 VPDB and Sr-87/Sr-86 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 Corumba 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 Corumba 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.Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)PROPE - UNESPUniv Estadual Paulista, Dept Geol Aplicada, Inst Geociencias & Ciencias Exatas, Ave 24A,1515, BR-13506900 Rio Claro, BrazilUniv Estadual Campinas UNICAMP, Fac Tecnol, Rua Paschoal Marmo 1888, BR-13484332 Jd Nova Itdlia, Limeira, BrazilUniv Sao Paulo, Inst Energia & Ambiente, Ave Prof Luciano Gualberto 1289, BR-05508010 Sao Paulo, BrazilUniv Sao Paulo, Inst Geociencias, Rua Lago 562, BR-05508010 Sao Paulo, BrazilUniv Fed Sao Paulo, Dept Ecol & Biol Evolut, Rua Prof Artur Riedel 275, BR-09972270 Diadema, BrazilUniv Estadual Paulista, Inst Biociencias, Dept Zool, BR-18618000 Botucatu, SP, BrazilUniv Brasilia, Inst Geociencias, ICC Ala Cent, BR-70910900 Brasilia, DF, BrazilFac Ciencias, Dept Geol, Calle Igua 4225, Montevideo 11400, UruguayUNLP, CONICET, Ctr Invest Geol, Calle 1,644, RA-1900 La Plata, Buenos Aires, ArgentinaUniv Fed Pernambuco, NEG LABISE, Ave Acad Helio Ramos, BR-50670000 Recife, PE, BrazilUniv Estadual Paulista, Dept Geol Aplicada, Inst Geociencias & Ciencias Exatas, Ave 24A,1515, BR-13506900 Rio Claro, BrazilUniv Estadual Paulista, Inst Biociencias, Dept Zool, BR-18618000 Botucatu, SP, BrazilFAPESP: 2004/012330FAPESP: 2010/19584-4FAPESP: 2010/02677-0FAPESP: 2015/24608-3CNPq: 490234/2005-4CNPq: 444070/2014-1Elsevier B.V.Universidade Estadual Paulista (Unesp)Universidade Estadual de Campinas (UNICAMP)Universidade de São Paulo (USP)Universidade Federal de São Paulo (UNIFESP)Universidade de Brasília (UnB)Fac CienciasUNLPUniversidade Federal de Pernambuco (UFPE)Warren, L. V. [UNESP]Freitas, B. T.Riccomini, C.Boggiani, P. C.Quaglio, F.Simoes, M. G. [UNESP]Fairchild, T. R.Giorgioni, M.Gaucher, C.Poire, D. G.Caceres, A. A.Sial, A. N.2019-10-04T12:35:30Z2019-10-04T12:35:30Z2019-03-01info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/article99-121http://dx.doi.org/10.1016/j.precamres.2018.12.022Precambrian Research. Amsterdam: Elsevier Science Bv, v. 322, p. 99-121, 2019.0301-9268http://hdl.handle.net/11449/18543110.1016/j.precamres.2018.12.022WOS:000458712700007Web of Sciencereponame:Repositório Institucional da UNESPinstname:Universidade Estadual Paulista (UNESP)instacron:UNESPengPrecambrian Researchinfo:eu-repo/semantics/openAccess2021-10-22T19:32:31Zoai:repositorio.unesp.br:11449/185431Repositório InstitucionalPUBhttp://repositorio.unesp.br/oai/requestopendoar:29462021-10-22T19:32:31Repositório Institucional da UNESP - Universidade Estadual Paulista (UNESP)false |
dc.title.none.fl_str_mv |
Sedimentary evolution and tectonic setting of the Itapucumi Group, Ediacaran, northern Paraguay: From Rodinia break-up to West Gondwana amalgamation |
title |
Sedimentary evolution and tectonic setting of the Itapucumi Group, Ediacaran, northern Paraguay: From Rodinia break-up to West Gondwana amalgamation |
spellingShingle |
Sedimentary evolution and tectonic setting of the Itapucumi Group, Ediacaran, northern Paraguay: From Rodinia break-up to West Gondwana amalgamation Warren, L. V. [UNESP] Stratigraphy C and O isotopes Sr data Ediacaran fauna Basin evolution Rio Apa Craton sedimentary cover Neoproterozoic SW Gondwana |
title_short |
Sedimentary evolution and tectonic setting of the Itapucumi Group, Ediacaran, northern Paraguay: From Rodinia break-up to West Gondwana amalgamation |
title_full |
Sedimentary evolution and tectonic setting of the Itapucumi Group, Ediacaran, northern Paraguay: From Rodinia break-up to West Gondwana amalgamation |
title_fullStr |
Sedimentary evolution and tectonic setting of the Itapucumi Group, Ediacaran, northern Paraguay: From Rodinia break-up to West Gondwana amalgamation |
title_full_unstemmed |
Sedimentary evolution and tectonic setting of the Itapucumi Group, Ediacaran, northern Paraguay: From Rodinia break-up to West Gondwana amalgamation |
title_sort |
Sedimentary evolution and tectonic setting of the Itapucumi Group, Ediacaran, northern Paraguay: From Rodinia break-up to West Gondwana amalgamation |
author |
Warren, L. V. [UNESP] |
author_facet |
Warren, L. V. [UNESP] Freitas, B. T. Riccomini, C. Boggiani, P. C. Quaglio, F. Simoes, M. G. [UNESP] Fairchild, T. R. Giorgioni, M. Gaucher, C. Poire, D. G. Caceres, A. A. Sial, A. N. |
author_role |
author |
author2 |
Freitas, B. T. Riccomini, C. Boggiani, P. C. Quaglio, F. Simoes, M. G. [UNESP] Fairchild, T. R. Giorgioni, M. Gaucher, C. Poire, D. G. Caceres, A. A. Sial, A. N. |
author2_role |
author author author author author author author author author author author |
dc.contributor.none.fl_str_mv |
Universidade Estadual Paulista (Unesp) Universidade Estadual de Campinas (UNICAMP) Universidade de São Paulo (USP) Universidade Federal de São Paulo (UNIFESP) Universidade de Brasília (UnB) Fac Ciencias UNLP Universidade Federal de Pernambuco (UFPE) |
dc.contributor.author.fl_str_mv |
Warren, L. V. [UNESP] Freitas, B. T. Riccomini, C. Boggiani, P. C. Quaglio, F. Simoes, M. G. [UNESP] Fairchild, T. R. Giorgioni, M. Gaucher, C. Poire, D. G. Caceres, A. A. Sial, A. N. |
dc.subject.por.fl_str_mv |
Stratigraphy C and O isotopes Sr data Ediacaran fauna Basin evolution Rio Apa Craton sedimentary cover Neoproterozoic SW Gondwana |
topic |
Stratigraphy C and O isotopes Sr data Ediacaran fauna Basin evolution Rio Apa Craton sedimentary cover Neoproterozoic SW Gondwana |
description |
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 similar to 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 parts per thousand delta C-13 VPDB and Sr-87/Sr-86 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 Corumba 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 Corumba 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. |
publishDate |
2019 |
dc.date.none.fl_str_mv |
2019-10-04T12:35:30Z 2019-10-04T12:35:30Z 2019-03-01 |
dc.type.status.fl_str_mv |
info:eu-repo/semantics/publishedVersion |
dc.type.driver.fl_str_mv |
info:eu-repo/semantics/article |
format |
article |
status_str |
publishedVersion |
dc.identifier.uri.fl_str_mv |
http://dx.doi.org/10.1016/j.precamres.2018.12.022 Precambrian Research. Amsterdam: Elsevier Science Bv, v. 322, p. 99-121, 2019. 0301-9268 http://hdl.handle.net/11449/185431 10.1016/j.precamres.2018.12.022 WOS:000458712700007 |
url |
http://dx.doi.org/10.1016/j.precamres.2018.12.022 http://hdl.handle.net/11449/185431 |
identifier_str_mv |
Precambrian Research. Amsterdam: Elsevier Science Bv, v. 322, p. 99-121, 2019. 0301-9268 10.1016/j.precamres.2018.12.022 WOS:000458712700007 |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.relation.none.fl_str_mv |
Precambrian Research |
dc.rights.driver.fl_str_mv |
info:eu-repo/semantics/openAccess |
eu_rights_str_mv |
openAccess |
dc.format.none.fl_str_mv |
99-121 |
dc.publisher.none.fl_str_mv |
Elsevier B.V. |
publisher.none.fl_str_mv |
Elsevier B.V. |
dc.source.none.fl_str_mv |
Web of Science reponame:Repositório Institucional da UNESP instname:Universidade Estadual Paulista (UNESP) instacron:UNESP |
instname_str |
Universidade Estadual Paulista (UNESP) |
instacron_str |
UNESP |
institution |
UNESP |
reponame_str |
Repositório Institucional da UNESP |
collection |
Repositório Institucional da UNESP |
repository.name.fl_str_mv |
Repositório Institucional da UNESP - Universidade Estadual Paulista (UNESP) |
repository.mail.fl_str_mv |
|
_version_ |
1797789531216281600 |