Paleoproterozoic Greenstone-Granite Belts in Northern Brazil and the Former Guyana Shield - West African Craton Province
The mainly meta-volcano-sedimentary Vila Nova Group and associated granites constitute separate belts, which formpart of a large paleoproterozoic (mainly rhyacian) province in the Guyana Shield of which northern Brazil forms a part, andthe West African Craton. In Brazil the southwestern Serra do Ipi...
| প্রধান লেখক: | , |
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| বিন্যাস: | প্রবন্ধ |
| ভাষা: | English |
| প্রকাশিত: |
Universidade de São Paulo
2006-03-01
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| মালা: | Geologia USP. Série Científica |
| বিষয়গুলি: | |
| অনলাইন ব্যবহার করুন: | http://ppegeo-local.igc.usp.br/pdf/guspsc/v5n2/04.pdf |
| _version_ | 1828871070732517376 |
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| author | Ian McReath Maria Telma Lins Faraco |
| author_facet | Ian McReath Maria Telma Lins Faraco |
| author_sort | Ian McReath |
| collection | DOAJ |
| description | The mainly meta-volcano-sedimentary Vila Nova Group and associated granites constitute separate belts, which formpart of a large paleoproterozoic (mainly rhyacian) province in the Guyana Shield of which northern Brazil forms a part, andthe West African Craton. In Brazil the southwestern Serra do Ipitinga and Serra Tumucumaque-Serra do Navio belts have noobvious geometrical extensions in the Guyanas or Venezuela, and may represent deposits formed at penecontemporaneouspassive continental margins and ocean floor spreading centres. To the Northeast the Serra Lombarda-Tartarugalzinho andOiapoque belts are continuations of Guianese belts. In the former the igneous rocks have geochemical characteristics ofsuprasubduction environments. Belts in the Guyana Shield and West African Craton have many similar features. Themegaprovince evolved in a number of stages, which may have started at about 2.3 Ga, and continued with diminished activityafter 2.11 Ga. Both major juvenile additions and (possibly minor) reworking of earlier crust contributed to the growth of theprovince. The major transcurrent deformation, responsible for the present structure of the belts, probably occurred duringthe later stages of evolution of the province, but metamorphism and deformation are registered even in the oldest rocks. |
| first_indexed | 2024-12-13T06:23:57Z |
| format | Article |
| id | doaj.art-11a38b51df2c4acc87836a7254b58e74 |
| institution | Directory Open Access Journal |
| issn | 1519-874X |
| language | English |
| last_indexed | 2024-12-13T06:23:57Z |
| publishDate | 2006-03-01 |
| publisher | Universidade de São Paulo |
| record_format | Article |
| series | Geologia USP. Série Científica |
| spelling | doaj.art-11a38b51df2c4acc87836a7254b58e742022-12-21T23:56:45ZengUniversidade de São PauloGeologia USP. Série Científica1519-874X2006-03-01524963Paleoproterozoic Greenstone-Granite Belts in Northern Brazil and the Former Guyana Shield - West African Craton ProvinceIan McReathMaria Telma Lins FaracoThe mainly meta-volcano-sedimentary Vila Nova Group and associated granites constitute separate belts, which formpart of a large paleoproterozoic (mainly rhyacian) province in the Guyana Shield of which northern Brazil forms a part, andthe West African Craton. In Brazil the southwestern Serra do Ipitinga and Serra Tumucumaque-Serra do Navio belts have noobvious geometrical extensions in the Guyanas or Venezuela, and may represent deposits formed at penecontemporaneouspassive continental margins and ocean floor spreading centres. To the Northeast the Serra Lombarda-Tartarugalzinho andOiapoque belts are continuations of Guianese belts. In the former the igneous rocks have geochemical characteristics ofsuprasubduction environments. Belts in the Guyana Shield and West African Craton have many similar features. Themegaprovince evolved in a number of stages, which may have started at about 2.3 Ga, and continued with diminished activityafter 2.11 Ga. Both major juvenile additions and (possibly minor) reworking of earlier crust contributed to the growth of theprovince. The major transcurrent deformation, responsible for the present structure of the belts, probably occurred duringthe later stages of evolution of the province, but metamorphism and deformation are registered even in the oldest rocks.http://ppegeo-local.igc.usp.br/pdf/guspsc/v5n2/04.pdfPaleoproterozoic greenstone-granite terrainsGuyana ShieldNorthern BrazilWest African Craton |
| spellingShingle | Ian McReath Maria Telma Lins Faraco Paleoproterozoic Greenstone-Granite Belts in Northern Brazil and the Former Guyana Shield - West African Craton Province Geologia USP. Série Científica Paleoproterozoic greenstone-granite terrains Guyana Shield Northern Brazil West African Craton |
| title | Paleoproterozoic Greenstone-Granite Belts in Northern Brazil and the Former Guyana Shield - West African Craton Province |
| title_full | Paleoproterozoic Greenstone-Granite Belts in Northern Brazil and the Former Guyana Shield - West African Craton Province |
| title_fullStr | Paleoproterozoic Greenstone-Granite Belts in Northern Brazil and the Former Guyana Shield - West African Craton Province |
| title_full_unstemmed | Paleoproterozoic Greenstone-Granite Belts in Northern Brazil and the Former Guyana Shield - West African Craton Province |
| title_short | Paleoproterozoic Greenstone-Granite Belts in Northern Brazil and the Former Guyana Shield - West African Craton Province |
| title_sort | paleoproterozoic greenstone granite belts in northern brazil and the former guyana shield west african craton province |
| topic | Paleoproterozoic greenstone-granite terrains Guyana Shield Northern Brazil West African Craton |
| url | http://ppegeo-local.igc.usp.br/pdf/guspsc/v5n2/04.pdf |
| work_keys_str_mv | AT ianmcreath paleoproterozoicgreenstonegranitebeltsinnorthernbrazilandtheformerguyanashieldwestafricancratonprovince AT mariatelmalinsfaraco paleoproterozoicgreenstonegranitebeltsinnorthernbrazilandtheformerguyanashieldwestafricancratonprovince |