GEOCHRONOLOGY OF THE GRANITOID HOSTED SALAMANGONE GOLD DEPOSIT, LOURENÇO DISTRICT, AMAPÁ, BRAZIL.
GEOCHRONOLOGY OF THE GRANITOID HOSTED SALAMANGONE GOLD DEPOSIT, LOURENÇO DISTRICT, AMAPÁ, BRAZIL.
| dc.contributor | en-US | |
| dc.contributor | pt-BR | |
| dc.creator | NOGUEIRA, SONIA APARECIDA ABISSI | |
| dc.creator | BETTENCOURT, JORGE SILVA | |
| dc.creator | TASSINARI, COLOMBO CELSO GAETA | |
| dc.date | 2017-03-29 | |
| dc.date.accessioned | 2022-12-15T20:15:40Z | |
| dc.date.available | 2022-12-15T20:15:40Z | |
| dc.identifier | https://ppegeo.igc.usp.br/index.php/rbg/article/view/10681 | |
| dc.identifier.uri | https://repositorioslatinoamericanos.uchile.cl/handle/2250/5360389 | |
| dc.description | The Salamangone deposit occurs in the Lourenço Gold District, Amapá. It is associated to Paleoproterozoic metamorphosed supracrustal rocks and a calc-alkaline complex. The deposit lies within a metaluminous to weakly peraluminous, calc-alkaline tonaliticgranodioritic pluton. The Au-mineralization consists of an epigenetic quartz-vein system, enriched in Au and As, and structurally controlled by a ductile-brittle shear zone. U-Pb zircon analyses of tonalite gave a crystallization age of 2.16 ± 0.13Ga, whereas Sm-Nd TDM model ages of tonalite and granodiorite range from 2.24 and 2.34Ga. eNd(T) vary from +2.88 to +3.02. Additional whole rock Rb-Sr isochron ages on granitoids yielded values in the range of 2.17 to 2.28Ga, with 87Sr/86Sr initial ratio of 0.702. The isotopic data and geochemical signature of granitoids suggest that the Lourenço region, as well as the neighboring areas in French Guyana, represents a vast area largely floored by accreted juvenile arc terranes without evidence of Archean crust contamination, being related to the development of a calc-alkaline magmatic arc, which was produced within the Maroni-Itacaíunas Province, during a major Paleoproterozoic orogenic event. | en-US |
| dc.description | The Salamangone deposit occurs in the Lourenço Gold District, Amapá. It is associated to Paleoproterozoic metamorphosed supracrustal rocks and a calc-alkaline complex. The deposit lies within a metaluminous to weakly peraluminous, calc-alkaline tonaliticgranodioritic pluton. The Au-mineralization consists of an epigenetic quartz-vein system, enriched in Au and As, and structurally controlled by a ductile-brittle shear zone. U-Pb zircon analyses of tonalite gave a crystallization age of 2.16 ± 0.13Ga, whereas Sm-Nd TDM model ages of tonalite and granodiorite range from 2.24 and 2.34Ga. eNd(T) vary from +2.88 to +3.02. Additional whole rock Rb-Sr isochron ages on granitoids yielded values in the range of 2.17 to 2.28Ga, with 87Sr/86Sr initial ratio of 0.702. The isotopic data and geochemical signature of granitoids suggest that the Lourenço region, as well as the neighboring areas in French Guyana, represents a vast area largely floored by accreted juvenile arc terranes without evidence of Archean crust contamination, being related to the development of a calc-alkaline magmatic arc, which was produced within the Maroni-Itacaíunas Province, during a major Paleoproterozoic orogenic event. | 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/10681/10182 | |
| dc.rights | Direitos autorais 2017 Revista Brasileira de Geociências | pt-BR |
| dc.source | Revista Brasileira de Geociências; v. 30, n. 2 (2000); 261-264 | en-US |
| dc.source | Revista Brasileira de Geociências; v. 30, n. 2 (2000); 261-264 | es-ES |
| dc.source | Revista Brasileira de Geociências; v. 30, n. 2 (2000); 261-264 | pt-BR |
| dc.source | 0375-7536 | |
| dc.subject | Amazonian Craton; Paleoproterozoic; Tonalite-trondhjemite-granodiorite(TTG); Gold mineralization. | en-US |
| dc.subject | Amazonian Craton; Paleoproterozoic; Tonalite-trondhjemite-granodiorite(TTG); Gold mineralization. | pt-BR |
| dc.title | GEOCHRONOLOGY OF THE GRANITOID HOSTED SALAMANGONE GOLD DEPOSIT, LOURENÇO DISTRICT, AMAPÁ, BRAZIL. | en-US |
| dc.title | GEOCHRONOLOGY OF THE GRANITOID HOSTED SALAMANGONE GOLD DEPOSIT, LOURENÇO DISTRICT, AMAPÁ, BRAZIL. | pt-BR |
| dc.type | info:eu-repo/semantics/article | |
| dc.type | info:eu-repo/semantics/publishedVersion | |
| dc.type | pt-BR |