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<p>The transition from collisional to post-collisional stages in Neoproterozoic orogens is commonly associated with shoshonitic magmatism; however, whether this magmatism reflects localized processes or regionally coherent lithospheric conditions remains debated. In particular, the pressure–temperature conditions under which these magmas crystallize are still poorly constrained, limiting our understanding of crustal stabilization during the final stages of orogenic evolution. This study investigates Ediacaran shoshonitic plutonism in the Borborema Province (NE Brazil) to constrain the physicochemical conditions of magma crystallization and to evaluate the extent to which these processes are regionally consistent. Mineral–chemical data from monzodioritic to granitic plutons distributed across the Rio Piranhas–Seridó and São José do Campestre domains were used to estimate crystallization conditions. The results indicate high crystallization temperatures (910–1020&#xa0;°C) and emplacement pressures of 4.1–5.5 kbar, corresponding to mid-crustal depths (~ 15–20&#xa0;km), under oxygen fugacity conditions near the Ni–NiO buffer. Despite their occurrence in distinct tectonic domains, the studied plutons display consistent mineral compositions and similar crystallization conditions. These findings demonstrate that shoshonitic magmatism in the Borborema Province records a regionally coherent mid-crustal thermal regime, rather than isolated magmatic events, providing new constraints on lithospheric reorganization during the transition from active orogenesis to tectonic stabilization in the final stages of West Gondwana assembly.</p> Graphical abstract <p></p>

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Crystallization conditions for shoshonitic magmatism in the Rio Piranhas–Seridó and São José do Campestre Domains, NE Borborema Province

  • 期刊论文

  • 发表日期：

    2026年6月30日

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  • Hemerson Lucas da Costa Silva,
  • Marcos Antonio Leite do Nascimento,
  • Frederico Castro Jobim Vilalva,
  • Rogério Cavalcante,
  • Dhulya Rafaelly das Chagas Rocha

摘要

The transition from collisional to post-collisional stages in Neoproterozoic orogens is commonly associated with shoshonitic magmatism; however, whether this magmatism reflects localized processes or regionally coherent lithospheric conditions remains debated. In particular, the pressure–temperature conditions under which these magmas crystallize are still poorly constrained, limiting our understanding of crustal stabilization during the final stages of orogenic evolution. This study investigates Ediacaran shoshonitic plutonism in the Borborema Province (NE Brazil) to constrain the physicochemical conditions of magma crystallization and to evaluate the extent to which these processes are regionally consistent. Mineral–chemical data from monzodioritic to granitic plutons distributed across the Rio Piranhas–Seridó and São José do Campestre domains were used to estimate crystallization conditions. The results indicate high crystallization temperatures (910–1020 °C) and emplacement pressures of 4.1–5.5 kbar, corresponding to mid-crustal depths (~ 15–20 km), under oxygen fugacity conditions near the Ni–NiO buffer. Despite their occurrence in distinct tectonic domains, the studied plutons display consistent mineral compositions and similar crystallization conditions. These findings demonstrate that shoshonitic magmatism in the Borborema Province records a regionally coherent mid-crustal thermal regime, rather than isolated magmatic events, providing new constraints on lithospheric reorganization during the transition from active orogenesis to tectonic stabilization in the final stages of West Gondwana assembly.

Graphical abstract