Campo DC | Valor | Idioma |
dc.contributor.author | Gervasoni, Fernanda | - |
dc.contributor.author | Jalowitzki, Tiago Luís Reis | - |
dc.contributor.author | Rocha, Marcelo Peres | - |
dc.contributor.author | Weska, Ricardo Kalikowski | - |
dc.contributor.author | Rodrigues, Eduardo Novais | - |
dc.contributor.author | Rodrigues, Rodrigo Antonio de Freitas | - |
dc.contributor.author | Yannick Bussweiler | - |
dc.contributor.author | Elisa Soares Rocha Barbosa | - |
dc.contributor.author | Jasper Berndt | - |
dc.contributor.author | Elton Luiz Dantas | - |
dc.contributor.author | Valmir da Silva Souza | - |
dc.contributor.author | Stephan Klemme | - |
dc.date.accessioned | 2024-09-27T12:43:02Z | - |
dc.date.available | 2024-09-27T12:43:02Z | - |
dc.date.issued | 2022 | - |
dc.identifier.citation | GERVASONI, Fernanda et al. Recycling process and proto-kimberlite melt metasomatism in the lithosphere-asthenosphere boundary beneath the Amazonian Craton recorded by garnet xenocrysts and mantle xenoliths from the Carolina kimberlite. Geoscience Frontiers, [S. l.], v. 13, n. 5, 101429, set. 2022. DOI: https://doi.org/10.1016/j.gsf.2022.101429. Disponível em: https://www.sciencedirect.com/science/article/pii/S1674987122000822?via%3Dihub. Acesso em: 27 set. 2024. | pt_BR |
dc.identifier.uri | http://repositorio.unb.br/handle/10482/50474 | - |
dc.language.iso | eng | pt_BR |
dc.publisher | Elsevier B. V. | pt_BR |
dc.rights | Acesso Aberto | pt_BR |
dc.title | Recycling process and proto-kimberlite melt metasomatism in the lithosphere-asthenosphere boundary beneath the Amazonian Craton recorded by garnet xenocrysts and mantle xenoliths from the Carolina kimberlite | pt_BR |
dc.type | Artigo | pt_BR |
dc.subject.keyword | Xenólitos mantélicos | pt_BR |
dc.subject.keyword | Craton amazônico | pt_BR |
dc.subject.keyword | Metassomatismo | pt_BR |
dc.rights.license | This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/). | pt_BR |
dc.identifier.doi | https://doi.org/10.1016/j.gsf.2022.101429 | pt_BR |
dc.description.abstract1 | Here we present new data on the major and trace element compositions of silicate and oxide minerals
from mantle xenoliths brought to the surface by the Carolina kimberlite, Pimenta Bueno Kimberlitic
Field, which is located on the southwestern border of the Amazonian Craton. We also present Sr-Nd iso-
topic data of garnet xenocrysts and whole-rocks from the Carolina kimberlite. Mantle xenoliths are
mainly clinopyroxenites and garnetites. Some of the clinopyroxenites were classified as GPP–PP–PKP
(garnet-phlogopite peridotite, phlogopite-peridotite, phlogopite-K-richterite peridotite) suites, and two
clinopyroxenites (eclogites) and two garnetites are relicts of an ancient subducted slab. Temperature
and pressure estimates yield 855–1102 °C and 3.6–7.0 GPa, respectively. Clinopyroxenes are enriched
in light rare earth elements (LREE) (LaN/Yb N = 5–62; CeN/SmN = 1–3; where N = primitive mantle normal-
ized values), they have high Ca/Al ratios (10–410), low to medium Ti/Eu ratios (742–2840), and low Zr/Hf
ratios (13–26), which suggest they were formed by metasomatic reactions with CO 2-rich silicate melts.
Phlogopite with high TiO 2 (>2.0 wt.%), Al 2O 3 (>12.0 wt.%), and FeOt (5.0–13.0 wt.%) resemble those found
in the groundmass of kimberlites, lamproites and lamprophyres. Conversely, phlogopite with low TiO 2
(<1.0 wt.%) and lower Al2O 3 (<12.0 wt.%) are similar to those present in GPP-PP-PKP, and in MARID
(mica-amphibole-rutile-ilmenite-diopside) and PIC (phlogopite-ilmenite-clinopyorxene) xenoliths. The
GPP-PP-PKP suite of xenoliths, together with the clinopyroxene and phlogopite major and trace element
signatures suggests that an intense proto-kimberlite melt metasomatism occurred in the deep cratonic
lithosphere beneath the Amazonian Craton. The Sr-Nd isotopic ratios of pyrope xenocrysts (G3, G9 and
G11) from the Carolina kimberlite are characterized by high 143
Nd/ 144
Nd (0.51287–0.51371) and eNd
(+4.55 to +20.85) accompanied with enriched 87 Sr/86 Sr (0.70405–0.71098). These results suggest interac-
tion with a proto-kimberlite melt compositionally similar with worldwide kimberlites. Based on Sr-Nd
whole-rock compositions, the Carolina kimberlite has affinity with Group 1 kimberlites. The Sm-Nd iso-
chron age calculated with selected eclogitic garnets yielded an age of 291.9 ± 5.4 Ma (2 r), which repre-
sents the cooling age after the proto-kimberlite melt metasomatism. Therefore, we propose that the
lithospheric mantle beneath the Amazonian Craton records the Paleozoic subduction with the attach-
ment of an eclogitic slab into the cratonic mantle (garnetites and eclogites); with a later metasomatic
event caused by proto-kimberlite melts shortly before the Carolina kimberlite erupted. | pt_BR |
dc.identifier.orcid | https://orcid.org/0000-0002-9533-4008 | pt_BR |
dc.identifier.orcid | https://orcid.org/0000-0002-8107-7055 | pt_BR |
dc.contributor.affiliation | Universidade Federal de Pelotas, Centro de Engenharias | pt_BR |
dc.contributor.affiliation | Universidade Federal do Rio Grande do Sul, Programa de Pós-graduação em Geociências | pt_BR |
dc.contributor.affiliation | Universidade de Brasília, Instituto de Geociências, Programa de Pós-graduação em Geologia | pt_BR |
dc.contributor.affiliation | Universidade de Brasília, Instituto de Geociências, Programa de Pós-graduação em Geologia | pt_BR |
dc.contributor.affiliation | Universidade Federal do Mato Grosso, Faculdade de Geociências | pt_BR |
dc.contributor.affiliation | Universidade de Brasília, Instituto de Geociências, Programa de Pós-graduação em Geologia | pt_BR |
dc.contributor.affiliation | Universidade de Brasília, Instituto de Geociências, Programa de Pós-graduação em Geologia | pt_BR |
dc.contributor.affiliation | Universität zu Köln, Institut für Geologie und Mineralogie, Germany | pt_BR |
dc.contributor.affiliation | Faculdade de Ciências e Tecnologia, Universidade Federal de Goiás | pt_BR |
dc.contributor.affiliation | Universität Münster, Institut für Mineralogie, Münster, Germany | pt_BR |
dc.contributor.affiliation | Universidade de Brasília, Instituto de Geociências, Programa de Pós-graduação em Geologia | pt_BR |
dc.contributor.affiliation | Universidade de Brasília, Instituto de Geociências, Programa de Pós-graduação em Geologia | pt_BR |
dc.contributor.affiliation | Universität Münster, Institut für Mineralogie, Münster, Germany | pt_BR |
dc.description.unidade | Instituto de Geociências (IG) | pt_BR |
dc.description.ppg | Programa de Pós-Graduação em Geologia | pt_BR |
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