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
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...
| Main Authors: | , , , , , , , , , , , |
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| Format: | Article |
| Language: | English |
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Elsevier
2022-09-01
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| Series: | Geoscience Frontiers |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S1674987122000822 |
| _version_ | 1797761339688484864 |
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| author | Fernanda Gervasoni Tiago Jalowitzki Marcelo Peres Rocha Ricardo Kalikowski Weska Eduardo Novais-Rodrigues Rodrigo Antonio de Freitas Rodrigues Yannick Bussweiler Elisa Soares Rocha Barbosa Jasper Berndt Elton Luiz Dantas Valmir da Silva Souza Stephan Klemme |
| author_facet | Fernanda Gervasoni Tiago Jalowitzki Marcelo Peres Rocha Ricardo Kalikowski Weska Eduardo Novais-Rodrigues Rodrigo Antonio de Freitas Rodrigues Yannick Bussweiler Elisa Soares Rocha Barbosa Jasper Berndt Elton Luiz Dantas Valmir da Silva Souza Stephan Klemme |
| author_sort | Fernanda Gervasoni |
| collection | DOAJ |
| description | 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 isotopic 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/YbN = 5–62; CeN/SmN = 1–3; where N = primitive mantle normalized 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 CO2-rich silicate melts. Phlogopite with high TiO2 (>2.0 wt.%), Al2O3 (>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 TiO2 (<1.0 wt.%) and lower Al2O3 (<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 143Nd/144Nd (0.51287–0.51371) and εNd (+4.55 to +20.85) accompanied with enriched 87Sr/86Sr (0.70405–0.71098). These results suggest interaction 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 isochron age calculated with selected eclogitic garnets yielded an age of 291.9 ± 5.4 Ma (2 σ), which represents 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 attachment 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. |
| first_indexed | 2024-03-12T19:11:33Z |
| format | Article |
| id | doaj.art-da1e384e085842f79492b3630a884d03 |
| institution | Directory Open Access Journal |
| issn | 1674-9871 |
| language | English |
| last_indexed | 2024-03-12T19:11:33Z |
| publishDate | 2022-09-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Geoscience Frontiers |
| spelling | doaj.art-da1e384e085842f79492b3630a884d032023-08-02T05:51:13ZengElsevierGeoscience Frontiers1674-98712022-09-01135101429Recycling 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 kimberliteFernanda Gervasoni0Tiago Jalowitzki1Marcelo Peres Rocha2Ricardo Kalikowski Weska3Eduardo Novais-Rodrigues4Rodrigo Antonio de Freitas Rodrigues5Yannick Bussweiler6Elisa Soares Rocha Barbosa7Jasper Berndt8Elton Luiz Dantas9Valmir da Silva Souza10Stephan Klemme11Centro de Engenharias, Universidade Federal de Pelotas (UFPel), Pelotas, Brazil; Programa de Pós-graduação em Geociências, Universidade Federal do Rio Grande do Sul, Porto Alegre, Brazil; Corresponding author.Programa de Pós-graduação em Geologia, Instituto de Geociências, Universidade de Brasília (UnB), Brasília, BrazilPrograma de Pós-graduação em Geologia, Instituto de Geociências, Universidade de Brasília (UnB), Brasília, BrazilFaculdade de Geociências, Universidade Federal do Mato Grosso (UFMT), Cuiabá, BrazilPrograma de Pós-graduação em Geologia, Instituto de Geociências, Universidade de Brasília (UnB), Brasília, BrazilPrograma de Pós-graduação em Geologia, Instituto de Geociências, Universidade de Brasília (UnB), Brasília, BrazilInstitut für Geologie und Mineralogie, Universität zu Köln, GermanyFaculdade de Ciências e Tecnologia, Universidade Federal de Goiás (UFG), Aparecida de Goiânia, BrazilInstitut für Mineralogie, Universität Münster, Münster, GermanyPrograma de Pós-graduação em Geologia, Instituto de Geociências, Universidade de Brasília (UnB), Brasília, BrazilPrograma de Pós-graduação em Geologia, Instituto de Geociências, Universidade de Brasília (UnB), Brasília, BrazilInstitut für Mineralogie, Universität Münster, Münster, GermanyHere 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 isotopic 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/YbN = 5–62; CeN/SmN = 1–3; where N = primitive mantle normalized 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 CO2-rich silicate melts. Phlogopite with high TiO2 (>2.0 wt.%), Al2O3 (>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 TiO2 (<1.0 wt.%) and lower Al2O3 (<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 143Nd/144Nd (0.51287–0.51371) and εNd (+4.55 to +20.85) accompanied with enriched 87Sr/86Sr (0.70405–0.71098). These results suggest interaction 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 isochron age calculated with selected eclogitic garnets yielded an age of 291.9 ± 5.4 Ma (2 σ), which represents 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 attachment 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.http://www.sciencedirect.com/science/article/pii/S1674987122000822Carolina kimberliteK-rich mantle xenolithsAncient subducted slabProto-kimberlite melt metasomatism |
| spellingShingle | Fernanda Gervasoni Tiago Jalowitzki Marcelo Peres Rocha Ricardo Kalikowski Weska Eduardo Novais-Rodrigues Rodrigo Antonio de Freitas Rodrigues Yannick Bussweiler Elisa Soares Rocha Barbosa Jasper Berndt Elton Luiz Dantas Valmir da Silva Souza Stephan Klemme 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 Carolina kimberlite K-rich mantle xenoliths Ancient subducted slab Proto-kimberlite melt metasomatism |
| 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 |
| title_full | 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 |
| title_fullStr | 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 |
| title_full_unstemmed | 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 |
| title_short | 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 |
| title_sort | 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 |
| topic | Carolina kimberlite K-rich mantle xenoliths Ancient subducted slab Proto-kimberlite melt metasomatism |
| url | http://www.sciencedirect.com/science/article/pii/S1674987122000822 |
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