Petrogenesis and age of skarns associated with felsic and metamafic dykes from the Paraíba do Sul Complex, southern Espírito Santo State
ABSTRACT: This paper concerns the study of petrography, mineral chemistry and geochronology of skarns generated at the contact of marbles of the Paraíba do Sul Complex with felsic and metamafic dykes in the southern Espírito Santo State. The marbles were metamorphosed under P-T granulite facies cond...
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Sociedade Brasileira de Geologia
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| Series: | Brazilian Journal of Geology |
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| Online Access: | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S2317-48892017000200301&lng=en&tlng=en |
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| author | Raissa Beloti de Mesquita Hanna Jordt-Evangelista Gláucia Nascimento Queiroga Edgar Batista de Medeiros Júnior Ivo Antônio Dussin |
| author_facet | Raissa Beloti de Mesquita Hanna Jordt-Evangelista Gláucia Nascimento Queiroga Edgar Batista de Medeiros Júnior Ivo Antônio Dussin |
| author_sort | Raissa Beloti de Mesquita |
| collection | DOAJ |
| description | ABSTRACT: This paper concerns the study of petrography, mineral chemistry and geochronology of skarns generated at the contact of marbles of the Paraíba do Sul Complex with felsic and metamafic dykes in the southern Espírito Santo State. The marbles were metamorphosed under P-T granulite facies conditions during the syn-collisional stage of the Neoproterozoic Araçuaí orogen. Metamafic bodies are composed of amphibolite and hornblende granofels, while felsic dykes consist of alkali-feldspar granite, monzogranite or syenogranite. From marble towards the dyke, skarns related to the metamafic bodies are composed of carbonate + olivine and diopside + hornblende zones. Skarn associated to the granitic dykes are composed of three different zones: carbonate + tremolite, diopside, scapolite + diopside. Variations in mineral chemical compositions along the metasomatic zones suggest introduction of Mg and Ca from the marbles, Fe from the metamafic dykes and Na from the granitoids. The presence of spinel in the metamafic dykes and their skarns indicates that both were metamorphosed under granulite facies conditions during the 580-560 Ma syn-collisional stage. U-Pb zircon geochronology (LA-ICP-MS) of an alkali-feldspar granite dyke resulted in a crystallization age of ca.540 Ma, which suggests that its skarns are therefore younger than skarns associated with the syn-collisional metamafic dykes. |
| first_indexed | 2024-12-17T13:17:26Z |
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| id | doaj.art-fddb293e0eac46aaa88dc9c9ad08f9e6 |
| institution | Directory Open Access Journal |
| issn | 2317-4692 |
| language | English |
| last_indexed | 2024-12-17T13:17:26Z |
| publisher | Sociedade Brasileira de Geologia |
| record_format | Article |
| series | Brazilian Journal of Geology |
| spelling | doaj.art-fddb293e0eac46aaa88dc9c9ad08f9e62022-12-21T21:46:58ZengSociedade Brasileira de GeologiaBrazilian Journal of Geology2317-469247230132510.1590/2317-4889201720160086S2317-48892017000200301Petrogenesis and age of skarns associated with felsic and metamafic dykes from the Paraíba do Sul Complex, southern Espírito Santo StateRaissa Beloti de MesquitaHanna Jordt-EvangelistaGláucia Nascimento QueirogaEdgar Batista de Medeiros JúniorIvo Antônio DussinABSTRACT: This paper concerns the study of petrography, mineral chemistry and geochronology of skarns generated at the contact of marbles of the Paraíba do Sul Complex with felsic and metamafic dykes in the southern Espírito Santo State. The marbles were metamorphosed under P-T granulite facies conditions during the syn-collisional stage of the Neoproterozoic Araçuaí orogen. Metamafic bodies are composed of amphibolite and hornblende granofels, while felsic dykes consist of alkali-feldspar granite, monzogranite or syenogranite. From marble towards the dyke, skarns related to the metamafic bodies are composed of carbonate + olivine and diopside + hornblende zones. Skarn associated to the granitic dykes are composed of three different zones: carbonate + tremolite, diopside, scapolite + diopside. Variations in mineral chemical compositions along the metasomatic zones suggest introduction of Mg and Ca from the marbles, Fe from the metamafic dykes and Na from the granitoids. The presence of spinel in the metamafic dykes and their skarns indicates that both were metamorphosed under granulite facies conditions during the 580-560 Ma syn-collisional stage. U-Pb zircon geochronology (LA-ICP-MS) of an alkali-feldspar granite dyke resulted in a crystallization age of ca.540 Ma, which suggests that its skarns are therefore younger than skarns associated with the syn-collisional metamafic dykes.http://www.scielo.br/scielo.php?script=sci_arttext&pid=S2317-48892017000200301&lng=en&tlng=enescarnitospetrogênesegeocronologiaComplexo Paraíba do Sul |
| spellingShingle | Raissa Beloti de Mesquita Hanna Jordt-Evangelista Gláucia Nascimento Queiroga Edgar Batista de Medeiros Júnior Ivo Antônio Dussin Petrogenesis and age of skarns associated with felsic and metamafic dykes from the Paraíba do Sul Complex, southern Espírito Santo State Brazilian Journal of Geology escarnitos petrogênese geocronologia Complexo Paraíba do Sul |
| title | Petrogenesis and age of skarns associated with felsic and metamafic dykes from the Paraíba do Sul Complex, southern Espírito Santo State |
| title_full | Petrogenesis and age of skarns associated with felsic and metamafic dykes from the Paraíba do Sul Complex, southern Espírito Santo State |
| title_fullStr | Petrogenesis and age of skarns associated with felsic and metamafic dykes from the Paraíba do Sul Complex, southern Espírito Santo State |
| title_full_unstemmed | Petrogenesis and age of skarns associated with felsic and metamafic dykes from the Paraíba do Sul Complex, southern Espírito Santo State |
| title_short | Petrogenesis and age of skarns associated with felsic and metamafic dykes from the Paraíba do Sul Complex, southern Espírito Santo State |
| title_sort | petrogenesis and age of skarns associated with felsic and metamafic dykes from the paraiba do sul complex southern espirito santo state |
| topic | escarnitos petrogênese geocronologia Complexo Paraíba do Sul |
| url | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S2317-48892017000200301&lng=en&tlng=en |
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