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

Gervasoni, Fernanda; Jalowitzki, Tiago; Rocha, Marcelo Peres; Weska, Ricardo Kalikowski; Novais-Rodrigues, Eduardo; Rodrigues, Rodrigo Antonio de Freitas; Bussweiler, Yannick; Barbosa, Elisa Soares Rocha; Berndt, Jasper; Dantas, Elton Luiz; Souza, Valmir da Silva; Klemme, Stephan

doi:10.1016/j.gsf.2022.101429

“…The grey areas in (a) and (b) represent the composition of the clinopyroxene of mantle xenoliths and concentrates of the kimberlites from Rondônia (196 analyses) and APIP (1322 analyses), respectively, from previous works. Data compilation from: Costa (1996), Carvalho (1997), Zolinger (2005), Chaves (2008a), Costa (2008), Silva (2008), Melluso et al (2008), Almeida (2009), Chaves et al (2009), Thomaz (2009), Hunt et al (2009), Nannini (2011), Andrade (2012), Guarino et al (2013), Nannini (2016) and Gervasoni et al (2022).…”

Section: Major Element Compositionmentioning

confidence: 99%

“…Figures 15 and 16 indicate the higher abundance of G3 and G4 garnet and lower-Cr 2 O 3 clinopyroxene with eclogitic composition in the Amazonian Craton relative to the APIP, which can be related to a distinct tectonothermal evolution of each area. Although the southwestern portion of the Amazonian Craton presents an extensively tectonic evolution in the Precambrian, the eclogitic garnet of the area is considered by Gervasoni et al (2022) as the record of a Paleozoic subduction in western South America. These tectonic processes beneath the Amazonian Craton can result in the deformation observed in some mantle xenoliths.…”

Section: Composition Of the Sclm Beneath The Azimuth 125º Lineamentmentioning

confidence: 99%

“…Density diagrams using garnet compositions of the kimberlite fields along the Azimuth 125º Lineament from APIP (a), Rondônia (b) and Juína (c). Data compiled from: Esperança et al (1995), Costa (1996), Carvalho (1997), Zolinger (2005), Tappert et al (2006), Chaves (2008a,b), Costa (2008), Pasin (2008), Thomaz (2009), Coelho (2010), Hunt et al (2009), Andrade and Chaves (2011), Andrade (2012), Weska et al (2012), Costa (2013), Fernandes et al (2014), Hill et al (2015), Nannini (2016), Cabral Neto et al (2017b), Gervasoni et al (2022.…”

Section: Composition Of the Sclm Beneath The Azimuth 125º Lineamentmentioning

confidence: 99%

See 1 more Smart Citation

Composition and P-T conditions of the lithospheric mantle beneath the Azimuth 125º Lineament, Northern and Southern Brazil: constraints from peridotite xenoliths enclosed in diamond-bearing kimberlites

Almeida¹,

Rodrigues²,

Neto³

et al. 2022

JGSB

0

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We present new petrographic and chemical data together with calculated P-T equilibrium conditions of peridotite xenoliths enclosed in kimberlites from Rondônia, Northern Brazil (Cosmos-1 and Carolina-1) and Minas Gerais, Southeastern Brazil (Canastra-1) located in the Azimuth 125º Lineament. The composition of the mantle minerals is distinct in both areas, which can be related to the diversity of the lithospheric mantle beneath the southwestern portion of the Amazonian Craton and the Brasília Belt. New and compiled chemical data indicate that subcalcic G10 garnet occurs in samples from the Canastra-1 kimberlite and other occurrences of the Alto Paranaíba Igneous Province and can be related to the remnants of the Archean lithospheric mantle of the São Francisco Craton beneath the area. The garnets from Rondônia are mostly G5 (pyroxenitic) and G9 (lherzolitic) with a higher abundance of G3 (eclogitic) and G4 (pyroxenitic/eclogitic) relative to the Alto Paranaíba Igneous Province. Higher pressures and temperatures were calculated for the samples from Rondônia (40-60 kbar and 1030-1380 ºC) compared to samples from Minas Gerais (25-40 kbar and 730-1000 ºC). The peridotite xenoliths from Rondônia show P-T equilibrium conditions in the diamond stability field and can be the source of at least part of the diamond from the area. The P-T stability fields of the xenoliths from both locations are aligned close to the 40 mW/m2 geotherm. The data indicate that the cratonic 40 mW/m2 geothermal gradient in Rondônia may be related to a process of thermal relaxation of the lithospheric mantle after the Paleoproterozoic to Mesoproterozoic tectonothermal events of the southwestern Amazonian Craton until the sampling of the xenoliths by the magma in the Permian-Triassic.Composition and P-T conditions of the lithospheric mantle beneath the Azimuth 125º Lineament, Northern and Southern Brazil: constraints from peridotite xenoliths enclosed in diamond-bearing kimberlites Accepted manuscript -Uncorrected pre-proof This is a PDF file containing an unedited and non-definitive version of a manuscript that has been accepted for publication by the Journal of the Geological Survey of Brazil -JGSB, which serves to provide early visibility of the article. Being an uncorrected preproof version, errors may appear during the production process (language review, formatting and proof review), and these can affect the final content of the article and all legal disclaimers (https://jgsb.cprm.gov.br/index.php/journal/6).

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“…The grey areas in (a) and (b) represent the composition of the clinopyroxene of mantle xenoliths and concentrates of the kimberlites from Rondônia (196 analyses) and APIP (1322 analyses), respectively, from previous works. Data compilation from: Costa (1996), Carvalho (1997), Zolinger (2005), Chaves (2008a), Costa (2008), Silva (2008), Melluso et al (2008), Almeida (2009), Chaves et al (2009), Thomaz (2009), Hunt et al (2009), Nannini (2011), Andrade (2012), Guarino et al (2013), Nannini (2016) and Gervasoni et al (2022).…”

Section: Major Element Compositionmentioning

confidence: 99%

“…Figures 15 and 16 indicate the higher abundance of G3 and G4 garnet and lower-Cr 2 O 3 clinopyroxene with eclogitic composition in the Amazonian Craton relative to the APIP, which can be related to a distinct tectonothermal evolution of each area. Although the southwestern portion of the Amazonian Craton presents an extensively tectonic evolution in the Precambrian, the eclogitic garnet of the area is considered by Gervasoni et al (2022) as the record of a Paleozoic subduction in western South America. These tectonic processes beneath the Amazonian Craton can result in the deformation observed in some mantle xenoliths.…”

Section: Composition Of the Sclm Beneath The Azimuth 125º Lineamentmentioning

confidence: 99%

Composition and P-T conditions of the lithospheric mantle beneath the Azimuth 125º Lineament, Northern and Southeastern Brazil: constraints from peridotite xenoliths enclosed in diamond-bearing kimberlites

Almeida¹,

Rodrigues²,

Neto³

et al. 2022

JGSB

2

0

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We present new petrographic and chemical data together with calculated P-T equilibrium conditions of peridotite xenoliths enclosed in kimberlites from Rondônia, Northern Brazil (Cosmos-1 and Carolina-1) and Minas Gerais, Southeastern Brazil (Canastra-1) located in the Azimuth 125º Lineament. The composition of the mantle minerals is distinct in both areas, which can be related to the diversity of the lithospheric mantle beneath the southwestern portion of the Amazonian Craton and the Brasília Belt. New and compiled chemical data indicate that subcalcic G10 garnet occurs in samples from the Canastra-1 kimberlite and other occurrences of the Alto Paranaíba Igneous Province and can be related to the remnants of the Archean lithospheric mantle of the São Francisco Craton beneath the area. The garnets from Rondônia are mostly G5 (pyroxenitic) and G9 (lherzolitic) with a higher abundance of G3 (eclogitic) and G4 (pyroxenitic/eclogitic) relative to the Alto Paranaíba Igneous Province. Higher pressures and temperatures were calculated for the samples from Rondônia (40-60 kbar and 1030-1380 ºC) compared to samples from Minas Gerais (25-40 kbar and 730-1000 ºC). The peridotite xenoliths from Rondônia show P-T equilibrium conditions in the diamond stability field and can be the source of at least part of the diamond from the area. The P-T stability fields of the xenoliths from both locations are aligned close to the 40 mW/m2 geotherm. The data indicate that the cratonic 40 mW/m2 geothermal gradient in Rondônia may be related to a process of thermal relaxation of the lithospheric mantle after the Paleoproterozoic to Mesoproterozoic tectonothermal events of the southwestern Amazonian Craton until the sampling of the xenoliths by the magma in the Permian-Triassic.Composition and P-T conditions of the lithospheric mantle beneath the Azimuth 125º Lineament, Northern and Southern Brazil: constraints from peridotite xenoliths enclosed in diamond-bearing kimberlites Accepted manuscript -Uncorrected pre-proof This is a PDF file containing an unedited and non-definitive version of a manuscript that has been accepted for publication by the Journal of the Geological Survey of Brazil -JGSB, which serves to provide early visibility of the article. Being an uncorrected preproof version, errors may appear during the production process (language review, formatting and proof review), and these can affect the final content of the article and all legal disclaimers (https://jgsb.cprm.gov.br/index.php/journal/6).

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Diamond sources of the Juína region, Amazonian craton: textural and mineral chemical characteristics of Kimberley-type pyroclastic kimberlites

Cabral-Neto,

Ruberti,

Pearson

et al. 2023

Miner Petrol

1

0

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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

Cited by 14 publications

References 102 publications

Composition and P-T conditions of the lithospheric mantle beneath the Azimuth 125º Lineament, Northern and Southern Brazil: constraints from peridotite xenoliths enclosed in diamond-bearing kimberlites

Composition and P-T conditions of the lithospheric mantle beneath the Azimuth 125º Lineament, Northern and Southern Brazil: constraints from peridotite xenoliths enclosed in diamond-bearing kimberlites

Composition and P-T conditions of the lithospheric mantle beneath the Azimuth 125º Lineament, Northern and Southeastern Brazil: constraints from peridotite xenoliths enclosed in diamond-bearing kimberlites

Diamond sources of the Juína region, Amazonian craton: textural and mineral chemical characteristics of Kimberley-type pyroclastic kimberlites

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