New age determinations for the Banhadão and Itapirapuã complexes in the Ribeira Valley, southern Brazil
New age determinations for the Banhadão and Itapirapuã complexes in the Ribeira Valley, southern Brazil
| dc.contributor | en-US | |
| dc.contributor | pt-BR | |
| dc.creator | Gomes, Celso de Barros | |
| dc.creator | Azzone, Rogério Guitarrari | |
| dc.creator | Ruberti, Excelso | |
| dc.creator | Vasconcelos, Paulo Marcos de | |
| dc.creator | Sato, Kei | |
| dc.creator | Enrich Rojas, Gaston Eduardo | |
| dc.date | 2018-04-13 | |
| dc.date.accessioned | 2022-12-15T20:10:56Z | |
| dc.date.available | 2022-12-15T20:10:56Z | |
| dc.identifier | https://ppegeo.igc.usp.br/index.php/bjg/article/view/12071 | |
| dc.identifier | 10.1590/2317-4889201820170094 | |
| dc.identifier.uri | https://repositorioslatinoamericanos.uchile.cl/handle/2250/5360093 | |
| dc.description | New age determinations by Ar-Ar and U-Pb SHRIMP for the alkaline complexes of Banhadão and Itapirapuã that occur in the Ribeira Valley are in agreement with the previously radiometric K-Ar ages available in literature. Ar-Ar ages on biotite for Banhadão range in the 106-110 Ma interval, and suggest a minimum age of 106 Ma for the complex. Ar-Ar data on biotite for Itapirapuã are more uniform, indicating an age of 102 Ma for the complex. U-Pb SHRIMP determinations on titanite from Itapirapuã melanite syenitic rocks yielded an age of ~106 Ma. Thus, the age interval of 100 and 110 Ma does exist indeed, suggesting an intermediate magmatic pulse between the already well-defined peaks of 80-90 Ma and 130-140 Ma for the alkaline rocks in southern Brazil, confirming the periodicity of the magmatism. | en-US |
| dc.description | New age determinations by Ar-Ar and U-Pb SHRIMP for the alkaline complexes of Banhadão and Itapirapuã that occur in the Ribeira Valley are in agreement with the previously radiometric K-Ar ages available in literature. Ar-Ar ages on biotite for Banhadão range in the 106-110 Ma interval, and suggest a minimum age of 106 Ma for the complex. Ar-Ar data on biotite for Itapirapuã are more uniform, indicating an age of 102 Ma for the complex. U-Pb SHRIMP determinations on titanite from Itapirapuã melanite syenitic rocks yielded an age of ~106 Ma. Thus, the age interval of 100 and 110 Ma does exist indeed, suggesting an intermediate magmatic pulse between the already well-defined peaks of 80-90 Ma and 130-140 Ma for the alkaline rocks in southern Brazil, confirming the periodicity of the magmatism. | pt-BR |
| dc.format | application/pdf | |
| dc.language | eng | |
| dc.publisher | Sociedade Brasileira de Geologia | pt-BR |
| dc.relation | https://ppegeo.igc.usp.br/index.php/bjg/article/view/12071/11616 | |
| dc.rights | Direitos autorais 2018 Brazilian Journal of Geology | pt-BR |
| dc.source | Brazilian Journal og Geology; v. 48, n. 2 (2018); 403-414 | en-US |
| dc.source | Brazilian Journal of Geology; v. 48, n. 2 (2018); 403-414 | pt-BR |
| dc.source | 2317-4692 | |
| dc.source | 2317-4889 | |
| dc.subject | Alkaline rocks; Ponta Grossa Arch; Geochronology. | en-US |
| dc.subject | Alkaline rocks; Ponta Grossa Arch; Geochronology. | pt-BR |
| dc.title | New age determinations for the Banhadão and Itapirapuã complexes in the Ribeira Valley, southern Brazil | en-US |
| dc.title | New age determinations for the Banhadão and Itapirapuã complexes in the Ribeira Valley, southern Brazil | pt-BR |
| dc.type | info:eu-repo/semantics/article | |
| dc.type | info:eu-repo/semantics/publishedVersion | |
| dc.type | en-US | |
| dc.type | pt-BR |