U-Pb SHRIMP and Sm-Nd geochronology of the Silvânia Volcanics and Jurubatuba Granite: juvenile Paleoproterozoic crust in the basement of the Neoproterozoic Brasília Belt,Goiás, central Brazil
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| Format: | Artículo científico |
| Langue: | en |
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Academia Brasileira de Ciências
2001
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| _version_ | 1876443500835241984 |
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| author | Márcio M. Pimentel |
| author_facet | Márcio M. Pimentel |
| contents | U-Pb SHRIMP and Sm-Nd geochronology of the Silvânia Volcanics and Jurubatuba Granite: juvenile Paleoproterozoic crust in the basement of the Neoproterozoic Brasília Belt,Goiás, central Brazil Márcio M. Pimentel Reinhardt A. Fuck Richard A. Armstrong Danielle P. Fischel Multidisciplinaria (Ciencias Naturales y Exactas) Sm Pb SHRIMP Brasília Belt basement rocks Nd isotopic data U-Pb SHRIMP and Sm-Nd isotopic ages were determined for felsic metavolcanic rocks from the SilvâniaSequence and Jurubatuba Granite in the central part of the Brasília Belt. Zircon grains from a metavolcanicsample yielded 2115±23 Ma and from the granite yielded 2089±14 Ma, interpreted as crystallization agesof these rocks.Six metavolcanic samples of the Silvânia Sequence yielded a six-point whole-rock Sm-Nd isochron indicatinga crystallization age of 2262 ±110 Ma and positive εNd(T) = +3.0 interpreted as a juvenile magmatic event.Nd isotopic analyses on samples from the Jurubatuba Granite have PaleoproterozoicTDM model ages between2.30 and 2.42 Ga and εNd(T) values vary between 0.22 and 0.58. The oldest TDM value refers to asedimentary xenolith in the granite. These results suggest crystallization ages of Silvânia volcanics andJurubatuba Granite are the first evidence of a ca. 2.14-2.08 juvenile magmatic event in the basement of thecentral part of the Brasília Belt that implies the presence of arc/suture hidden in reworked basement of theBrasília Belt. 2001 artículo científico 0001-3765 https://www.redalyc.org/articulo.oa?id=32773312 en http://www.redalyc.org/revista.oa?id=327 Anais da Academia Brasileira de Ciências application/pdf Academia Brasileira de Ciências Anais da Academia Brasileira de Ciências (Brasil) Num.3 Vol.73 |
| format | Artículo científico |
| id | redalyc_32773312 |
| institution | Redalyc |
| language | en |
| publishDate | 2001 |
| publisher | Academia Brasileira de Ciências |
| spellingShingle | U-Pb SHRIMP and Sm-Nd geochronology of the Silvânia Volcanics and Jurubatuba Granite: juvenile Paleoproterozoic crust in the basement of the Neoproterozoic Brasília Belt,Goiás, central Brazil Márcio M. Pimentel Multidisciplinaria (Ciencias Naturales y Exactas) Sm Pb SHRIMP Brasília Belt basement rocks Nd isotopic data U-Pb SHRIMP and Sm-Nd geochronology of the Silvânia Volcanics and Jurubatuba Granite: juvenile Paleoproterozoic crust in the basement of the Neoproterozoic Brasília Belt,Goiás, central Brazil Márcio M. Pimentel Reinhardt A. Fuck Richard A. Armstrong Danielle P. Fischel Multidisciplinaria (Ciencias Naturales y Exactas) Sm Pb SHRIMP Brasília Belt basement rocks Nd isotopic data U-Pb SHRIMP and Sm-Nd isotopic ages were determined for felsic metavolcanic rocks from the SilvâniaSequence and Jurubatuba Granite in the central part of the Brasília Belt. Zircon grains from a metavolcanicsample yielded 2115±23 Ma and from the granite yielded 2089±14 Ma, interpreted as crystallization agesof these rocks.Six metavolcanic samples of the Silvânia Sequence yielded a six-point whole-rock Sm-Nd isochron indicatinga crystallization age of 2262 ±110 Ma and positive εNd(T) = +3.0 interpreted as a juvenile magmatic event.Nd isotopic analyses on samples from the Jurubatuba Granite have PaleoproterozoicTDM model ages between2.30 and 2.42 Ga and εNd(T) values vary between 0.22 and 0.58. The oldest TDM value refers to asedimentary xenolith in the granite. These results suggest crystallization ages of Silvânia volcanics andJurubatuba Granite are the first evidence of a ca. 2.14-2.08 juvenile magmatic event in the basement of thecentral part of the Brasília Belt that implies the presence of arc/suture hidden in reworked basement of theBrasília Belt. 2001 artículo científico 0001-3765 https://www.redalyc.org/articulo.oa?id=32773312 en http://www.redalyc.org/revista.oa?id=327 Anais da Academia Brasileira de Ciências application/pdf Academia Brasileira de Ciências Anais da Academia Brasileira de Ciências (Brasil) Num.3 Vol.73 |
| title | U-Pb SHRIMP and Sm-Nd geochronology of the Silvânia Volcanics and Jurubatuba Granite: juvenile Paleoproterozoic crust in the basement of the Neoproterozoic Brasília Belt,Goiás, central Brazil |
| topic | Multidisciplinaria (Ciencias Naturales y Exactas) Sm Pb SHRIMP Brasília Belt basement rocks Nd isotopic data |
| url | https://www.redalyc.org/articulo.oa?id=32773312 |