Nascimento, Matheus Andrade; Rios, Debora Correia; Magalhães, Nivea Maria Assis; Silveira, Francisco Valdir (2026) From Mantle to Cratonic Reactivation: Petrological Insights from Kimberlites and Lamproites of the São Francisco Craton, Brazil. Minerals, 16 (1). doi:10.3390/min16010019
| Reference Type | Journal (article/letter/editorial) | ||
|---|---|---|---|
| Title | From Mantle to Cratonic Reactivation: Petrological Insights from Kimberlites and Lamproites of the São Francisco Craton, Brazil | ||
| Journal | Minerals | ||
| Authors | Nascimento, Matheus Andrade | Author | |
| Rios, Debora Correia | Author | ||
| Magalhães, Nivea Maria Assis | Author | ||
| Silveira, Francisco Valdir | Author | ||
| Year | 2026 | Volume | < 16 > |
| Issue | < 1 > | ||
| URL | |||
| DOI | doi:10.3390/min16010019Search in ResearchGate | ||
| Generate Citation Formats | |||
| Classification | Not set | LoC | Not set |
| Mindat Ref. ID | 19383116 | Long-form Identifier | mindat:1:5:19383116:4 |
| GUID | 0 | ||
| Full Reference | Nascimento, Matheus Andrade; Rios, Debora Correia; Magalhães, Nivea Maria Assis; Silveira, Francisco Valdir (2026) From Mantle to Cratonic Reactivation: Petrological Insights from Kimberlites and Lamproites of the São Francisco Craton, Brazil. Minerals, 16 (1). doi:10.3390/min16010019 | ||
| Plain Text | Nascimento, Matheus Andrade; Rios, Debora Correia; Magalhães, Nivea Maria Assis; Silveira, Francisco Valdir (2026) From Mantle to Cratonic Reactivation: Petrological Insights from Kimberlites and Lamproites of the São Francisco Craton, Brazil. Minerals, 16 (1). doi:10.3390/min16010019 | ||
| In | Link this record to the correct parent record (if possible) | ||
| Abstract/Notes | This study redefines the Nordestina Kimberlite Province (PKN), in the northeastern sector of the São Francisco Craton (SFC), as a composite kimberlitic–lamproitic system that hosts two genetically distinct magma types: (1) the primitive Braúna kimberlite and (2) hybridized phlogopite-rich lamproites belonging to the SFC lamproite variety. Braúna kimberlites represent an olivine-rich kimberlite sourced from a metasomatized lithospheric mantle, as reflected by its high MgO (15%–30.6%), Ni (up to 1172 ppm), and Cr (up to 2500 ppm). These geochemical signatures are consistent with a primitive melt capable of preserving diamond stability conditions. In contrast, the SFC lamproite variety exhibits strong crustal overprinting, marked by hydrothermal barite–carbonate–silica veining, cristobalite, elevated SiO2 (up to 80 wt.%), and high LOI (up to 27.5%). These features indicate significant post-magmatic alteration, felsic crust assimilation, and melt hybridization. Textural and mineralogical features found in both magma types, including olivine-phlogopite aggregates, irregular zoning, and disequilibrium assemblages, suggest magma mingling between compositionally distinct melts and/or crystallization under polybaric conditions. These findings clarify long-standing classification controversies by demonstrating that PKN magmatism is not represented by a single rock type but instead spans a continuum spectrum from primitive kimberlite to strongly hybridized lamproite. Regionally, the data reveal that PKN magmatism reflects Paleoproterozoic mantle metasomatism reactivated during Neoproterozoic tectonism. This dual-stage evolution explains the contrasting degrees of primitiveness and hybridization melt signatures observed across the province. | ||
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