Resende lamprophyres: new petrological and structural interpretations for a regional Upper Cretaceous alkaline mafic dyke swarm
Autor(a) principal: | |
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Data de Publicação: | 2022 |
Outros Autores: | , , |
Tipo de documento: | Artigo |
Idioma: | eng |
Título da fonte: | Brazilian Journal of Geology |
Texto Completo: | http://old.scielo.br/scielo.php?script=sci_arttext&pid=S2317-48892022000100304 |
Resumo: | Abstract New petrographic, lithogeochemical and structural analyses were performed on the Upper Cretaceous lamprophyres emplaced in the Proterozoic basement rocks of the Resende sedimentary basin in SE Brazil. Field characteristics and petrographic data confirm their identification as alkaline lamprophyres. Geochemical variations were mainly controlled by fractional crystallization of clinopyroxene and olivine. Liquid immiscibility, rapid cooling and crustal assimilation may have occurred subordinately during the evolution of the Resende lamprophyres. Mantle and chondrite-normalized diagrams point to an enriched mantle as the lamprophyre’s magma source. Th/Yb and Ta/Yb ratios confirm a within-plate enriched mantle source with residual carbonate and phlogopite/amphibole as suggested by LILE enrichment and the presence of carbonate and phlogopite/amphibole as primary phases. The predominance of an ENE-trend of the dykes is related to a prevalent NNW-SSW orientation of the minimum principal stress (σ3) orientation in an extensional regime during the emplacement of the Resende lamprophyres’ dyke swarm. Frequent offsets produced by local dilation direction are parallel to the NNW-oriented extension of the main segments. WNW to NW secondary sets are controlled by previous discontinuities that were favored as pathways for the highly volatile lamprophyre magma. An NNW-SSE distension related to the Resende lamprophyre dyke swarm emplacement is consistent with the early stages of evolution of the Resende basin and uplift of its basement during the Late Cretaceous to the Paleocene. |
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Brazilian Journal of Geology |
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Resende lamprophyres: new petrological and structural interpretations for a regional Upper Cretaceous alkaline mafic dyke swarmlamprophyre dykesResende, fractional crystallizationUpper Cretaceous magmatismAbstract New petrographic, lithogeochemical and structural analyses were performed on the Upper Cretaceous lamprophyres emplaced in the Proterozoic basement rocks of the Resende sedimentary basin in SE Brazil. Field characteristics and petrographic data confirm their identification as alkaline lamprophyres. Geochemical variations were mainly controlled by fractional crystallization of clinopyroxene and olivine. Liquid immiscibility, rapid cooling and crustal assimilation may have occurred subordinately during the evolution of the Resende lamprophyres. Mantle and chondrite-normalized diagrams point to an enriched mantle as the lamprophyre’s magma source. Th/Yb and Ta/Yb ratios confirm a within-plate enriched mantle source with residual carbonate and phlogopite/amphibole as suggested by LILE enrichment and the presence of carbonate and phlogopite/amphibole as primary phases. The predominance of an ENE-trend of the dykes is related to a prevalent NNW-SSW orientation of the minimum principal stress (σ3) orientation in an extensional regime during the emplacement of the Resende lamprophyres’ dyke swarm. Frequent offsets produced by local dilation direction are parallel to the NNW-oriented extension of the main segments. WNW to NW secondary sets are controlled by previous discontinuities that were favored as pathways for the highly volatile lamprophyre magma. An NNW-SSE distension related to the Resende lamprophyre dyke swarm emplacement is consistent with the early stages of evolution of the Resende basin and uplift of its basement during the Late Cretaceous to the Paleocene.Sociedade Brasileira de Geologia2022-01-01info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersiontext/htmlhttp://old.scielo.br/scielo.php?script=sci_arttext&pid=S2317-48892022000100304Brazilian Journal of Geology v.52 n.1 2022reponame:Brazilian Journal of Geologyinstname:Sociedade Brasileira de Geologia (SBGEO)instacron:SBGEO10.1590/2317-4889202120210043info:eu-repo/semantics/openAccessMacedo,Bruno NevesPeternel,RodrigoSantos,Anderson Costa dosSimas,Marcela Perrotieng2022-04-29T00:00:00Zoai:scielo:S2317-48892022000100304Revistahttp://bjg.siteoficial.ws/index.htmhttps://old.scielo.br/oai/scielo-oai.phpsbgsede@sbgeo.org.br||claudio.riccomini@gmail.com2317-46922317-4692opendoar:2022-04-29T00:00Brazilian Journal of Geology - Sociedade Brasileira de Geologia (SBGEO)false |
dc.title.none.fl_str_mv |
Resende lamprophyres: new petrological and structural interpretations for a regional Upper Cretaceous alkaline mafic dyke swarm |
title |
Resende lamprophyres: new petrological and structural interpretations for a regional Upper Cretaceous alkaline mafic dyke swarm |
spellingShingle |
Resende lamprophyres: new petrological and structural interpretations for a regional Upper Cretaceous alkaline mafic dyke swarm Macedo,Bruno Neves lamprophyre dykes Resende, fractional crystallization Upper Cretaceous magmatism |
title_short |
Resende lamprophyres: new petrological and structural interpretations for a regional Upper Cretaceous alkaline mafic dyke swarm |
title_full |
Resende lamprophyres: new petrological and structural interpretations for a regional Upper Cretaceous alkaline mafic dyke swarm |
title_fullStr |
Resende lamprophyres: new petrological and structural interpretations for a regional Upper Cretaceous alkaline mafic dyke swarm |
title_full_unstemmed |
Resende lamprophyres: new petrological and structural interpretations for a regional Upper Cretaceous alkaline mafic dyke swarm |
title_sort |
Resende lamprophyres: new petrological and structural interpretations for a regional Upper Cretaceous alkaline mafic dyke swarm |
author |
Macedo,Bruno Neves |
author_facet |
Macedo,Bruno Neves Peternel,Rodrigo Santos,Anderson Costa dos Simas,Marcela Perroti |
author_role |
author |
author2 |
Peternel,Rodrigo Santos,Anderson Costa dos Simas,Marcela Perroti |
author2_role |
author author author |
dc.contributor.author.fl_str_mv |
Macedo,Bruno Neves Peternel,Rodrigo Santos,Anderson Costa dos Simas,Marcela Perroti |
dc.subject.por.fl_str_mv |
lamprophyre dykes Resende, fractional crystallization Upper Cretaceous magmatism |
topic |
lamprophyre dykes Resende, fractional crystallization Upper Cretaceous magmatism |
description |
Abstract New petrographic, lithogeochemical and structural analyses were performed on the Upper Cretaceous lamprophyres emplaced in the Proterozoic basement rocks of the Resende sedimentary basin in SE Brazil. Field characteristics and petrographic data confirm their identification as alkaline lamprophyres. Geochemical variations were mainly controlled by fractional crystallization of clinopyroxene and olivine. Liquid immiscibility, rapid cooling and crustal assimilation may have occurred subordinately during the evolution of the Resende lamprophyres. Mantle and chondrite-normalized diagrams point to an enriched mantle as the lamprophyre’s magma source. Th/Yb and Ta/Yb ratios confirm a within-plate enriched mantle source with residual carbonate and phlogopite/amphibole as suggested by LILE enrichment and the presence of carbonate and phlogopite/amphibole as primary phases. The predominance of an ENE-trend of the dykes is related to a prevalent NNW-SSW orientation of the minimum principal stress (σ3) orientation in an extensional regime during the emplacement of the Resende lamprophyres’ dyke swarm. Frequent offsets produced by local dilation direction are parallel to the NNW-oriented extension of the main segments. WNW to NW secondary sets are controlled by previous discontinuities that were favored as pathways for the highly volatile lamprophyre magma. An NNW-SSE distension related to the Resende lamprophyre dyke swarm emplacement is consistent with the early stages of evolution of the Resende basin and uplift of its basement during the Late Cretaceous to the Paleocene. |
publishDate |
2022 |
dc.date.none.fl_str_mv |
2022-01-01 |
dc.type.driver.fl_str_mv |
info:eu-repo/semantics/article |
dc.type.status.fl_str_mv |
info:eu-repo/semantics/publishedVersion |
format |
article |
status_str |
publishedVersion |
dc.identifier.uri.fl_str_mv |
http://old.scielo.br/scielo.php?script=sci_arttext&pid=S2317-48892022000100304 |
url |
http://old.scielo.br/scielo.php?script=sci_arttext&pid=S2317-48892022000100304 |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.relation.none.fl_str_mv |
10.1590/2317-4889202120210043 |
dc.rights.driver.fl_str_mv |
info:eu-repo/semantics/openAccess |
eu_rights_str_mv |
openAccess |
dc.format.none.fl_str_mv |
text/html |
dc.publisher.none.fl_str_mv |
Sociedade Brasileira de Geologia |
publisher.none.fl_str_mv |
Sociedade Brasileira de Geologia |
dc.source.none.fl_str_mv |
Brazilian Journal of Geology v.52 n.1 2022 reponame:Brazilian Journal of Geology instname:Sociedade Brasileira de Geologia (SBGEO) instacron:SBGEO |
instname_str |
Sociedade Brasileira de Geologia (SBGEO) |
instacron_str |
SBGEO |
institution |
SBGEO |
reponame_str |
Brazilian Journal of Geology |
collection |
Brazilian Journal of Geology |
repository.name.fl_str_mv |
Brazilian Journal of Geology - Sociedade Brasileira de Geologia (SBGEO) |
repository.mail.fl_str_mv |
sbgsede@sbgeo.org.br||claudio.riccomini@gmail.com |
_version_ |
1752122399494504448 |