New insights on the occurrence of peperites and sedimentary deposits within the silicic volcanic sequences of the Parana Magmatic Province, Brazil
Autor(a) principal: | |
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Data de Publicação: | 2014 |
Outros Autores: | , , , |
Tipo de documento: | Artigo |
Idioma: | eng |
Título da fonte: | Repositório Institucional da UNESP |
Texto Completo: | http://dx.doi.org/10.5194/se-5-121-2014 http://hdl.handle.net/11449/111611 |
Resumo: | The PMP (Parana Magmatic Province) is characterized by lava flows of the Early Cretaceous Serra Geral Formation which covers about 75% of the Parana Basin (southern and southeastern Brazil), composed of a thick (up to 1600 m) volcanic sequence formed by a succession of petrographically and geochemically distinct units of basic and silicic composition. The whole package must have been emplaced during approximately 3 million years of nearly uninterrupted activity. A few aeolian sandstone layers, indicating arid environmental conditions (the Botucatu Formation), are interlayered in the lower basalts. Above the basalts, the Palmas and Chapeco Members are composed of silicic volcanic rocks (quartz latites, dacites, rhyodacites and rhyolites) and basalts. This paper presents new evidence of sedimentation episodes separating silicic volcanic events, expressed by the occurrence of sedimentary deposits. Interaction between the volcanic bodies and the coeval unconsolidated sediments formed peperites. The sediments were observed between basaltic lava flows and silicic rocks or interlayered in the Palmas-type rocks, between the Chapeco-type rocks and overlying basaltic flows, between silicic bodies of the Palmas and Chapeco types, and interlayered within Palmas-type units. The observed structures indicate that the sediments were still wet and unconsolidated, or weakly consolidated, at the time of volcanism, which, coupled with the sediment features, reflect environmental conditions that are different from those characterizing the Botucatu arid conditions. |
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New insights on the occurrence of peperites and sedimentary deposits within the silicic volcanic sequences of the Parana Magmatic Province, BrazilThe PMP (Parana Magmatic Province) is characterized by lava flows of the Early Cretaceous Serra Geral Formation which covers about 75% of the Parana Basin (southern and southeastern Brazil), composed of a thick (up to 1600 m) volcanic sequence formed by a succession of petrographically and geochemically distinct units of basic and silicic composition. The whole package must have been emplaced during approximately 3 million years of nearly uninterrupted activity. A few aeolian sandstone layers, indicating arid environmental conditions (the Botucatu Formation), are interlayered in the lower basalts. Above the basalts, the Palmas and Chapeco Members are composed of silicic volcanic rocks (quartz latites, dacites, rhyodacites and rhyolites) and basalts. This paper presents new evidence of sedimentation episodes separating silicic volcanic events, expressed by the occurrence of sedimentary deposits. Interaction between the volcanic bodies and the coeval unconsolidated sediments formed peperites. The sediments were observed between basaltic lava flows and silicic rocks or interlayered in the Palmas-type rocks, between the Chapeco-type rocks and overlying basaltic flows, between silicic bodies of the Palmas and Chapeco types, and interlayered within Palmas-type units. The observed structures indicate that the sediments were still wet and unconsolidated, or weakly consolidated, at the time of volcanism, which, coupled with the sediment features, reflect environmental conditions that are different from those characterizing the Botucatu arid conditions.Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)Univ Estadual Paulista, Inst Geociencias & Ciencias Exatas, BR-13506900 Rio Claro, SP, BrazilUniv Fed Sao Paulo, Dept Ciencias Exatas & Terra, BR-09920540 Sao Paulo, BrazilUniv Lisbon, Inst Dom Luiz, Fac Ciencias GeoFCUL, Dept Geol, P-1699 Lisbon, PortugalUniv Nacl Salta, Fac Ciencias Nat, Inst Geonorte, Salta, ArgentinaUniv Estadual Paulista, Inst Geociencias & Ciencias Exatas, BR-13506900 Rio Claro, SP, BrazilCopernicus Gesellschaft MbhUniversidade Estadual Paulista (Unesp)Universidade Federal de São Paulo (UNIFESP)Univ LisbonUniv Nacl SaltaLuchetti, A. C. F. [UNESP]Nardy, A. J. R. [UNESP]Machado, F. B.Madeira, J. E. O.Arnosio, J. M.2014-12-03T13:08:50Z2014-12-03T13:08:50Z2014-01-01info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/article121-130application/pdfhttp://dx.doi.org/10.5194/se-5-121-2014Solid Earth. Gottingen: Copernicus Gesellschaft Mbh, v. 5, n. 1, p. 121-130, 2014.1869-9510http://hdl.handle.net/11449/11161110.5194/se-5-121-2014WOS:000337218200009WOS000337218200009.pdfWeb of Sciencereponame:Repositório Institucional da UNESPinstname:Universidade Estadual Paulista (UNESP)instacron:UNESPengSolid Earth4.1651,060info:eu-repo/semantics/openAccess2023-11-27T06:13:26Zoai:repositorio.unesp.br:11449/111611Repositório InstitucionalPUBhttp://repositorio.unesp.br/oai/requestopendoar:29462023-11-27T06:13:26Repositório Institucional da UNESP - Universidade Estadual Paulista (UNESP)false |
dc.title.none.fl_str_mv |
New insights on the occurrence of peperites and sedimentary deposits within the silicic volcanic sequences of the Parana Magmatic Province, Brazil |
title |
New insights on the occurrence of peperites and sedimentary deposits within the silicic volcanic sequences of the Parana Magmatic Province, Brazil |
spellingShingle |
New insights on the occurrence of peperites and sedimentary deposits within the silicic volcanic sequences of the Parana Magmatic Province, Brazil Luchetti, A. C. F. [UNESP] |
title_short |
New insights on the occurrence of peperites and sedimentary deposits within the silicic volcanic sequences of the Parana Magmatic Province, Brazil |
title_full |
New insights on the occurrence of peperites and sedimentary deposits within the silicic volcanic sequences of the Parana Magmatic Province, Brazil |
title_fullStr |
New insights on the occurrence of peperites and sedimentary deposits within the silicic volcanic sequences of the Parana Magmatic Province, Brazil |
title_full_unstemmed |
New insights on the occurrence of peperites and sedimentary deposits within the silicic volcanic sequences of the Parana Magmatic Province, Brazil |
title_sort |
New insights on the occurrence of peperites and sedimentary deposits within the silicic volcanic sequences of the Parana Magmatic Province, Brazil |
author |
Luchetti, A. C. F. [UNESP] |
author_facet |
Luchetti, A. C. F. [UNESP] Nardy, A. J. R. [UNESP] Machado, F. B. Madeira, J. E. O. Arnosio, J. M. |
author_role |
author |
author2 |
Nardy, A. J. R. [UNESP] Machado, F. B. Madeira, J. E. O. Arnosio, J. M. |
author2_role |
author author author author |
dc.contributor.none.fl_str_mv |
Universidade Estadual Paulista (Unesp) Universidade Federal de São Paulo (UNIFESP) Univ Lisbon Univ Nacl Salta |
dc.contributor.author.fl_str_mv |
Luchetti, A. C. F. [UNESP] Nardy, A. J. R. [UNESP] Machado, F. B. Madeira, J. E. O. Arnosio, J. M. |
description |
The PMP (Parana Magmatic Province) is characterized by lava flows of the Early Cretaceous Serra Geral Formation which covers about 75% of the Parana Basin (southern and southeastern Brazil), composed of a thick (up to 1600 m) volcanic sequence formed by a succession of petrographically and geochemically distinct units of basic and silicic composition. The whole package must have been emplaced during approximately 3 million years of nearly uninterrupted activity. A few aeolian sandstone layers, indicating arid environmental conditions (the Botucatu Formation), are interlayered in the lower basalts. Above the basalts, the Palmas and Chapeco Members are composed of silicic volcanic rocks (quartz latites, dacites, rhyodacites and rhyolites) and basalts. This paper presents new evidence of sedimentation episodes separating silicic volcanic events, expressed by the occurrence of sedimentary deposits. Interaction between the volcanic bodies and the coeval unconsolidated sediments formed peperites. The sediments were observed between basaltic lava flows and silicic rocks or interlayered in the Palmas-type rocks, between the Chapeco-type rocks and overlying basaltic flows, between silicic bodies of the Palmas and Chapeco types, and interlayered within Palmas-type units. The observed structures indicate that the sediments were still wet and unconsolidated, or weakly consolidated, at the time of volcanism, which, coupled with the sediment features, reflect environmental conditions that are different from those characterizing the Botucatu arid conditions. |
publishDate |
2014 |
dc.date.none.fl_str_mv |
2014-12-03T13:08:50Z 2014-12-03T13:08:50Z 2014-01-01 |
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/10.5194/se-5-121-2014 Solid Earth. Gottingen: Copernicus Gesellschaft Mbh, v. 5, n. 1, p. 121-130, 2014. 1869-9510 http://hdl.handle.net/11449/111611 10.5194/se-5-121-2014 WOS:000337218200009 WOS000337218200009.pdf |
url |
http://dx.doi.org/10.5194/se-5-121-2014 http://hdl.handle.net/11449/111611 |
identifier_str_mv |
Solid Earth. Gottingen: Copernicus Gesellschaft Mbh, v. 5, n. 1, p. 121-130, 2014. 1869-9510 10.5194/se-5-121-2014 WOS:000337218200009 WOS000337218200009.pdf |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.relation.none.fl_str_mv |
Solid Earth 4.165 1,060 |
dc.rights.driver.fl_str_mv |
info:eu-repo/semantics/openAccess |
eu_rights_str_mv |
openAccess |
dc.format.none.fl_str_mv |
121-130 application/pdf |
dc.publisher.none.fl_str_mv |
Copernicus Gesellschaft Mbh |
publisher.none.fl_str_mv |
Copernicus Gesellschaft Mbh |
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 |
|
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1792961932547850240 |