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April 13, 2026Meteoritics and Planetary ScienceOpen Access

Confirming the impact origin of the São Miguel do Tapuio structure, northeastern Brazil

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Authors

ÁCÁlvaro Penteado CróstaNCNeivaldo Araújo de CastroMVMarcos Alberto Rodrigues Vasconcelos

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Overview

Field survey confirms impact origin of the São Miguel do Tapuio structure, suggesting significant geological history.

Key Points

  • The aim is to confirm the impact origin of the São Miguel do Tapuio structure in northeastern Brazil.
  • Conducted a field survey in 2017 to collect samples from the central area of the structure.
  • Analyzed thin sections of sandstone and breccia for shocked quartz characteristics.
  • Performed universal stage measurements on shocked quartz grains to assess crystallographic orientations.
  • Discovered multiple shocked quartz grains with planar fractures, feather features, and planar deformation features.
  • Confirmed shock pressures of up to 20 GPa based on quartz crystallographic analysis.
  • Confirmed the impact origin of the SMT, marking it as the second largest impact structure in South America.

Cite This Study

Crósta et al. (2026) studied this question.

synapsesocial.com/papers/69dc88b93afacbeac03ea6fchttps://doi.org/10.1111/maps.70144
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