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Atomic-scale age resolution of planetary events.

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This study uses atom probe tomography for nanoscale U-Pb isotopic analysis of baddeleyite. This method precisely dates planetary crustal processes and impact events, revealing new timelines for geological events.

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Area of Science:

  • Geochemistry
  • Planetary Science
  • Isotope Geochronology

Background:

  • Understanding planetary crustal processes and impact chronologies is crucial for assessing habitability.
  • Current isotopic techniques face limitations in resolving multi-stage events at nanoscale.
  • Baddeleyite is a key mineral found across various planetary bodies, offering potential for geochronology.

Purpose of the Study:

  • To demonstrate the capability of atom probe tomography for high-precision U-Pb isotopic analysis of nanoscale baddeleyite domains.
  • To establish a more accurate chronology for complex geological events in planetary materials.

Main Methods:

  • Utilized atom probe tomography (APT) for nanoscale U-Pb isotopic analysis.
  • Analyzed individual baddeleyite crystals from the Sudbury impact structure.
  • Isolated and dated three distinct nanostructural domains within baddeleyite.

Main Results:

  • Achieved accurate U-Pb dating of nanoscale domains within baddeleyite crystals.
  • Identified three distinct age domains: 2,436±94 Ma (protolith crystallization), 1,852±45 Ma (impact), and 1,412±56 Ma (tectonic metamorphism).
  • Demonstrated the ability to differentiate between multiple geological events within a single mineral.

Conclusions:

  • Atom probe tomography enables precise U-Pb dating at the atomic scale in baddeleyite.
  • This technique can resolve complex, multi-stage geological histories of planetary materials.
  • The approach has broad applicability for dating crustal evolution on Earth, Mars, the Moon, and asteroids.