GRANITOIDS MARKING THE END OF THE BRASILIANO (PAN - AFRICAN) OROGENY WITHIN THE CENTRAL TECTONIC DOMAIN OF THE BORBOREMA PROVINCE
GRANITOIDS MARKING THE END OF THE BRASILIANO (PAN - AFRICAN) OROGENY WITHIN THE CENTRAL TECTONIC DOMAIN OF THE BORBOREMA PROVINCE
| dc.contributor | en-US | |
| dc.contributor | pt-BR | |
| dc.creator | GUIMARÃES, IGNEZ DE PINHO | |
| dc.creator | ALMEIDA, CÍCERA NEYSI DE | |
| dc.creator | SILVA FILHO, ADEJARDO FRANCISCO DA | |
| dc.creator | ARAÚJO, JOÃO MARIA MARTINS DE | |
| dc.date | 2017-04-13 | |
| dc.date.accessioned | 2022-12-15T20:33:30Z | |
| dc.date.available | 2022-12-15T20:33:30Z | |
| dc.identifier | https://ppegeo.igc.usp.br/index.php/rbg/article/view/10970 | |
| dc.identifier.uri | https://repositorioslatinoamericanos.uchile.cl/handle/2250/5361459 | |
| dc.description | The studied syenogranite and granodiorite intrusions have a similar U-Pb zircon age (ca 570 Ma). They are intruded in the Central Tectonic Domain of the Borborema Province, forming an S-type belt in relation to the Patos and Pernambuco Lineaments. The studied granitoids are clinopyroxene biotite leuco-syenogranites of the Solidão Pluton; amphibole biotite sienogranites from the Queimadas Pluton; biotite granodiorite and amphibole biotite granodiorite, which occur as dikes cutting the Itapetim Complex and leuco-syenogranites from the Serra Branca Pluton. They show geochemical data transitional between shoshonitic and alkaline series. Deep troughs at Nb, Sr, P and Ti and high LILE/HFSE ratios characterize the spiderdiagram patterns. The ÎNd (0.6 Ga) values are extremely negative (- 11 to -16; except for the Itapetim dykes ~-3) and Nd model ages (TDM) range from 2.0 Ga to 2.5 Ga (the Itapetim dykes ~1.4Ga). Biotites of the studied granitoids are Fe-rich with Fe/(Fe+Mg) ratios in the 0.62 to 0.84 range. Biotites from older granitoids (640 Ma -580 Ma) of the Pajeú - Paraíba Terrane, have Fe/(Fe+Mg) ratios < 0.60. The isotopic and geochemical data suggest that the studied granitoids correspond to a trans-alkaline, ferro-potassic plutonism, originated by partial melting of Paleoproterozoic and Mesoproterozoic crusts, emplaced during the final stage of the Brasiliano Orogeny in the Central Tectonic Domain of the Borborema Province. | en-US |
| dc.description | The studied syenogranite and granodiorite intrusions have a similar U-Pb zircon age (ca 570 Ma). They are intruded in the Central Tectonic Domain of the Borborema Province, forming an S-type belt in relation to the Patos and Pernambuco Lineaments. The studied granitoids are clinopyroxene biotite leuco-syenogranites of the Solidão Pluton; amphibole biotite sienogranites from the Queimadas Pluton; biotite granodiorite and amphibole biotite granodiorite, which occur as dikes cutting the Itapetim Complex and leuco-syenogranites from the Serra Branca Pluton. They show geochemical data transitional between shoshonitic and alkaline series. Deep troughs at Nb, Sr, P and Ti and high LILE/HFSE ratios characterize the spiderdiagram patterns. The ÎNd (0.6 Ga) values are extremely negative (- 11 to -16; except for the Itapetim dykes ~-3) and Nd model ages (TDM) range from 2.0 Ga to 2.5 Ga (the Itapetim dykes ~1.4Ga). Biotites of the studied granitoids are Fe-rich with Fe/(Fe+Mg) ratios in the 0.62 to 0.84 range. Biotites from older granitoids (640 Ma -580 Ma) of the Pajeú - Paraíba Terrane, have Fe/(Fe+Mg) ratios < 0.60. The isotopic and geochemical data suggest that the studied granitoids correspond to a trans-alkaline, ferro-potassic plutonism, originated by partial melting of Paleoproterozoic and Mesoproterozoic crusts, emplaced during the final stage of the Brasiliano Orogeny in the Central Tectonic Domain of the Borborema Province. | 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/rbg/article/view/10970/10424 | |
| dc.rights | Direitos autorais 2017 Revista Brasileira de Geociências | pt-BR |
| dc.source | Revista Brasileira de Geociências; v. 30, n. 1 (2000); 177-181 | en-US |
| dc.source | Revista Brasileira de Geociências; v. 30, n. 1 (2000); 177-181 | es-ES |
| dc.source | Revista Brasileira de Geociências; v. 30, n. 1 (2000); 177-181 | pt-BR |
| dc.source | 0375-7536 | |
| dc.subject | Granites; Brasiliano; Post-collision. | en-US |
| dc.subject | Granites; Brasiliano; Post-collision. | pt-BR |
| dc.title | GRANITOIDS MARKING THE END OF THE BRASILIANO (PAN - AFRICAN) OROGENY WITHIN THE CENTRAL TECTONIC DOMAIN OF THE BORBOREMA PROVINCE | en-US |
| dc.title | GRANITOIDS MARKING THE END OF THE BRASILIANO (PAN - AFRICAN) OROGENY WITHIN THE CENTRAL TECTONIC DOMAIN OF THE BORBOREMA PROVINCE | pt-BR |
| dc.type | info:eu-repo/semantics/article | |
| dc.type | info:eu-repo/semantics/publishedVersion | |
| dc.type | pt-BR |