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http://hdl.handle.net/1843/76120| Type: | Artigo de Periódico |
| Title: | Fragments of 1.79-1.75 Ga Large Igneous Provinces in reconstructing Columbia (Nuna): a Statherian supercontinentsuperplume coupling? |
| Other Titles: | Fragmentos de grandes províncias ígneas de 1,79-1,75 Ga na reconstrução de Columbia (Nuna): um acoplamento de supercontinente e superpluma Statheriano? |
| Authors: | Alexandre de Oliveira Chaves Christopher Rocha de Rezende |
| Abstract: | Supported on available paleomagnetic data, a new Columbia (Nuna) supercontinent reconstruction is proposed based on matching U-Pb-dated 1.79-1.75 Ga Large Igneous Province (LIP) mafic unit fragments and particularly on linking their dykes into radiating systems. Information from the literature is augmented with the herein dated 1762 Ma (U-Pb) Januária dyke swarm from the São Francisco Craton (Brazil). In this reconstruction, three major LIPs would be restored. The first one (1.79 Ga Hart-Carson LIP), would consist of the Hart sills and Carson volcanics, and the Pebbair mafic dyke swarm. The second one (1.79-1.78 Ga Avanavero-Xiong’er LIP), would be composed of Avanavero sills and dykes, Taihang and Xiong’er dykes along with volcanics, Pará de Minas-1 dykes, Uruguayan/Florida dykes, Tomashgorod-Belokorovichi dykes and related intrusives, Oskarshamn dykes, and Libiri dykes. The third one (1.76-1.75 Ga Timpton LIP), would comprise the Timpton radiating swarm, Newer dolerites, Januária dykes, Kédougou dykes, Tagragra of Akka dykes, Vestfold Hills-3 dykes, Kivalliq suite, Subbottsy-Nosachev dykes and intrusives, and Pugachevka-Fedorovka dykes and intrusives. Additionally, it is suggested that the model of supercontinent-superplume coupling (previously applied to Rodinia and Pangea supercontinents) represents a possible geodynamic framework for Columbia (Nuna) during the beginning of the Statherian Period. |
| Abstract: | Com base em dados paleomagnéticos disponíveis, uma nova reconstrução do supercontinente Columbia (Nuna) é proposta com base na correspondência de fragmentos de unidades máficas da Grande Província Ígnea (LIP) datados de U-Pb de 1,79-1,75 Ga e, particularmente na ligação de seus diques em sistemas radiantes. As informações da literatura são aumentadas com o enxame de diques Januária datado de 1762 Ma (U-Pb) do Cráton do São Francisco (Brasil). Nesta reconstrução, três principais LIPs seriam restaurados. O primeiro (1,79 Ga Hart-Carson LIP) consistiria nas soleiras Hart e vulcânicas Carson, e o enxame de diques máficos Pebbair. O segundo (1,79-1,78 Ga Avanavero-Xiong'er LIP), seria composto por soleiras e diques Avanavero, diques Taihang e Xiong'er junto com vulcânicos, diques Pará de Minas-1, diques Uruguaio/Flórida, diques Tomashgorod-Belokorovichi e intrusivos relacionados, diques Oskarshamn e diques Libiri. O terceiro (1,76-1,75 Ga Timpton LIP), compreenderia o enxame radiante Timpton, doleritos Newer, diques Januária , diques Kédougou, diques Tagragra de Akka, diques Vestfold Hills-3, suíte Kivalliq, diques Subbottsy-Nosachev e intrusivos, e diques Pugachevka-Fedorovka e intrusivos. Além disso, sugere-se que o modelo de acoplamento supercontinente-superpluma (anteriormente aplicado aos supercontinentes Rodínia e Pangea) representa uma possível estrutura geodinâmica para Columbia (Nuna) durante o início do Período Statheriano. |
| Subject: | Diques (Geologia) Datação Arqueológica |
| language: | eng |
| metadata.dc.publisher.country: | Brasil |
| Publisher: | Universidade Federal de Minas Gerais |
| Publisher Initials: | UFMG |
| metadata.dc.publisher.department: | IGC - DEPARTAMENTO DE GEOLOGIA |
| Rights: | Acesso Aberto |
| metadata.dc.identifier.doi: | https://doi.org/10.18814/epiiugs/2019/019006 |
| URI: | http://hdl.handle.net/1843/76120 |
| Issue Date: | 2019 |
| metadata.dc.url.externa: | https://www.episodes.org/journal/view.html?doi=10.18814/epiiugs/2019/019006 |
| metadata.dc.relation.ispartof: | Episodes, Journal of Internacional Geoscience |
| Appears in Collections: | Artigo de Periódico |
Files in This Item:
| File | Description | Size | Format | |
|---|---|---|---|---|
| Fragments of 1.79-1.75 Ga Large Igneous Provinces.pdfA.pdf | 6.75 MB | Adobe PDF | View/Open |
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