Evidence of mingling between contrasting magmas in a deep plutonic environment: the example of Várzea Alegre, in the Ribeira Mobile Belt, Espírito Santo, Brazil
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| Format: | Artículo científico |
| Langue: | en |
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Academia Brasileira de Ciências
2001
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| _version_ | 1876461288363655168 |
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| author | Silvia R. Medeiros |
| author_facet | Silvia R. Medeiros |
| contents | Evidence of mingling between contrasting magmas in a deep plutonic environment: the example of Várzea Alegre, in the Ribeira Mobile Belt, Espírito Santo, Brazil Silvia R. Medeiros Cristina M. Wiedemann-Leonardos Simon Vriend Multidisciplinaria (Ciencias Naturales y Exactas) post Ribeira Belt Magma mingling collisional magmatism At the end of the geotectonic cycle that shaped the northern segment of the Ribeira Mobile Belt (UpperProterozoic to Paleozoic age), a late to post-collisional set of plutonic complexes, consisting of a wide rangeof lithotypes, intruded all metamorphic units.The Várzea Alegre Intrusive Complex is a post-collisional complex. The younger intrusion consists of aninversely zoned multistage structure envolved by a large early emplaced ring of megaporphyritic charnoenderbiticrocks.The combination of field, petrographic and geochemical data reveals the presence of at least two different seriesof igneous rocks. The first originated from the partial melting of the mantle. This was previously enriched inincompatible elements, low and intermediate REE and some HFS-elements. A second enrichment in LREEand incompatible elements in this serieswas due to the mingling with a crustal granitic magma. This minglingprocess changed the composition of the original tholeiitic magma towards a medium-K calc-alkalic magmato produce a suite of basic to intermediate rock types.The granitic magma from the second high-K, calc-alkalic suite originated from the partial melting of thecontinental crust, but with strong influence of mantle-derived melts. 2001 artículo científico 0001-3765 https://www.redalyc.org/articulo.oa?id=32773109 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.1 Vol.73 |
| format | Artículo científico |
| id | redalyc_32773109 |
| institution | Redalyc |
| language | en |
| publishDate | 2001 |
| publisher | Academia Brasileira de Ciências |
| spellingShingle | Evidence of mingling between contrasting magmas in a deep plutonic environment: the example of Várzea Alegre, in the Ribeira Mobile Belt, Espírito Santo, Brazil Silvia R. Medeiros Multidisciplinaria (Ciencias Naturales y Exactas) post Ribeira Belt Magma mingling collisional magmatism Evidence of mingling between contrasting magmas in a deep plutonic environment: the example of Várzea Alegre, in the Ribeira Mobile Belt, Espírito Santo, Brazil Silvia R. Medeiros Cristina M. Wiedemann-Leonardos Simon Vriend Multidisciplinaria (Ciencias Naturales y Exactas) post Ribeira Belt Magma mingling collisional magmatism At the end of the geotectonic cycle that shaped the northern segment of the Ribeira Mobile Belt (UpperProterozoic to Paleozoic age), a late to post-collisional set of plutonic complexes, consisting of a wide rangeof lithotypes, intruded all metamorphic units.The Várzea Alegre Intrusive Complex is a post-collisional complex. The younger intrusion consists of aninversely zoned multistage structure envolved by a large early emplaced ring of megaporphyritic charnoenderbiticrocks.The combination of field, petrographic and geochemical data reveals the presence of at least two different seriesof igneous rocks. The first originated from the partial melting of the mantle. This was previously enriched inincompatible elements, low and intermediate REE and some HFS-elements. A second enrichment in LREEand incompatible elements in this serieswas due to the mingling with a crustal granitic magma. This minglingprocess changed the composition of the original tholeiitic magma towards a medium-K calc-alkalic magmato produce a suite of basic to intermediate rock types.The granitic magma from the second high-K, calc-alkalic suite originated from the partial melting of thecontinental crust, but with strong influence of mantle-derived melts. 2001 artículo científico 0001-3765 https://www.redalyc.org/articulo.oa?id=32773109 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.1 Vol.73 |
| title | Evidence of mingling between contrasting magmas in a deep plutonic environment: the example of Várzea Alegre, in the Ribeira Mobile Belt, Espírito Santo, Brazil |
| topic | Multidisciplinaria (Ciencias Naturales y Exactas) post Ribeira Belt Magma mingling collisional magmatism |
| url | https://www.redalyc.org/articulo.oa?id=32773109 |