Geochemistry and δ11 B evolution of tourmaline from tourmalinite as a record of oceanic crust in the Tonian Ibaré ophiolite, southern Brasiliano Orogen
Abstract The isotopic and geochemical evolution of tourmaline constrain the processes of paleo-oceanic lithosphere in ophiolites. The Brasiliano Orogen is a major structure of South America and requires characterization for the understanding of Gondwana supercontinent evolution. We made a pioneerin...
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Academia Brasileira de Ciências
2020-04-01
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| Series: | Anais da Academia Brasileira de Ciências |
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| Online Access: | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652020000100603&tlng=en |
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| author | KARINE DA ROSA ARENA LÉO AFRANEO HARTMANN CRISTIANO DE CARVALHO LANA GLÁUCIA NASCIMENTO QUEIROGA MARCO PAULO DE CASTRO |
| author_facet | KARINE DA ROSA ARENA LÉO AFRANEO HARTMANN CRISTIANO DE CARVALHO LANA GLÁUCIA NASCIMENTO QUEIROGA MARCO PAULO DE CASTRO |
| author_sort | KARINE DA ROSA ARENA |
| collection | DOAJ |
| description | Abstract The isotopic and geochemical evolution of tourmaline constrain the processes of paleo-oceanic lithosphere in ophiolites. The Brasiliano Orogen is a major structure of South America and requires characterization for the understanding of Gondwana supercontinent evolution. We made a pioneering investigation of tourmaline from a tourmalinite in the Ibaré ophiolite by integrating field work with chemical analyses of tourmaline by electron microprobe (EPMA) and δ11B determinations via laser ablation inductively coupled plasma mass spectrometer (LA-ICP-MS). Remarkably massive tourmalinite (>90 vol.% tourmaline, some chlorite) enclosed in serpentinite has homogeneous dravite in chemical and isotopic composition (δ11B = +3.5 to +5.2‰). These results indicate a geotectonic environment in the altered oceanic crust for the origin of the tourmalinite. This first δ11B characterization of tourmaline from tourmalinite sets limits to the evolution of the Neoproterozoic to Cambrian Brasiliano Orogen and Gondwana evolution. |
| first_indexed | 2024-12-18T04:53:27Z |
| format | Article |
| id | doaj.art-5f29eafd4ea8404aa54cb869cefcaf6d |
| institution | Directory Open Access Journal |
| issn | 1678-2690 |
| language | English |
| last_indexed | 2024-12-18T04:53:27Z |
| publishDate | 2020-04-01 |
| publisher | Academia Brasileira de Ciências |
| record_format | Article |
| series | Anais da Academia Brasileira de Ciências |
| spelling | doaj.art-5f29eafd4ea8404aa54cb869cefcaf6d2022-12-21T21:20:21ZengAcademia Brasileira de CiênciasAnais da Academia Brasileira de Ciências1678-26902020-04-0192110.1590/0001-3765202020180193Geochemistry and δ11 B evolution of tourmaline from tourmalinite as a record of oceanic crust in the Tonian Ibaré ophiolite, southern Brasiliano OrogenKARINE DA ROSA ARENAhttps://orcid.org/0000-0002-5724-7333LÉO AFRANEO HARTMANNhttps://orcid.org/0000-0001-7863-5071CRISTIANO DE CARVALHO LANAhttps://orcid.org/0000-0001-6302-9706GLÁUCIA NASCIMENTO QUEIROGAhttps://orcid.org/0000-0002-1730-0638MARCO PAULO DE CASTROhttps://orcid.org/0000-0001-8209-5995Abstract The isotopic and geochemical evolution of tourmaline constrain the processes of paleo-oceanic lithosphere in ophiolites. The Brasiliano Orogen is a major structure of South America and requires characterization for the understanding of Gondwana supercontinent evolution. We made a pioneering investigation of tourmaline from a tourmalinite in the Ibaré ophiolite by integrating field work with chemical analyses of tourmaline by electron microprobe (EPMA) and δ11B determinations via laser ablation inductively coupled plasma mass spectrometer (LA-ICP-MS). Remarkably massive tourmalinite (>90 vol.% tourmaline, some chlorite) enclosed in serpentinite has homogeneous dravite in chemical and isotopic composition (δ11B = +3.5 to +5.2‰). These results indicate a geotectonic environment in the altered oceanic crust for the origin of the tourmalinite. This first δ11B characterization of tourmaline from tourmalinite sets limits to the evolution of the Neoproterozoic to Cambrian Brasiliano Orogen and Gondwana evolution.http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652020000100603&tlng=enboron isotopesgeochemistryIbaré ophiolitetourmalinitesouthern Brasiliano Orogen |
| spellingShingle | KARINE DA ROSA ARENA LÉO AFRANEO HARTMANN CRISTIANO DE CARVALHO LANA GLÁUCIA NASCIMENTO QUEIROGA MARCO PAULO DE CASTRO Geochemistry and δ11 B evolution of tourmaline from tourmalinite as a record of oceanic crust in the Tonian Ibaré ophiolite, southern Brasiliano Orogen Anais da Academia Brasileira de Ciências boron isotopes geochemistry Ibaré ophiolite tourmalinite southern Brasiliano Orogen |
| title | Geochemistry and δ11 B evolution of tourmaline from tourmalinite as a record of oceanic crust in the Tonian Ibaré ophiolite, southern Brasiliano Orogen |
| title_full | Geochemistry and δ11 B evolution of tourmaline from tourmalinite as a record of oceanic crust in the Tonian Ibaré ophiolite, southern Brasiliano Orogen |
| title_fullStr | Geochemistry and δ11 B evolution of tourmaline from tourmalinite as a record of oceanic crust in the Tonian Ibaré ophiolite, southern Brasiliano Orogen |
| title_full_unstemmed | Geochemistry and δ11 B evolution of tourmaline from tourmalinite as a record of oceanic crust in the Tonian Ibaré ophiolite, southern Brasiliano Orogen |
| title_short | Geochemistry and δ11 B evolution of tourmaline from tourmalinite as a record of oceanic crust in the Tonian Ibaré ophiolite, southern Brasiliano Orogen |
| title_sort | geochemistry and δ11 b evolution of tourmaline from tourmalinite as a record of oceanic crust in the tonian ibare ophiolite southern brasiliano orogen |
| topic | boron isotopes geochemistry Ibaré ophiolite tourmalinite southern Brasiliano Orogen |
| url | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652020000100603&tlng=en |
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