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Related Experiment Video

Updated: Jul 13, 2026

Synthesis and Exfoliation of Discotic Zirconium Phosphates to Obtain Colloidal Liquid Crystals
08:54

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Published on: May 25, 2016

The crystallization age of eucrite zircon.

G Srinivasan1, M J Whitehouse, I Weber

  • 1Department of Geology, University of Toronto, Toronto, ON, Canada, M5S 3B1. srini@geology.utoronto.ca

Science (New York, N.Y.)
|July 21, 2007
PubMed
Summary

Eucrite meteorites formed rapidly within 6.8 million years of differentiation, indicating early planetary heating. Subsequent metamorphism likely resulted from impacts, not lava flows, providing key timing constraints for early solar system processes.

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Published on: April 16, 2017

Area of Science:

  • Planetary Science
  • Cosmochemistry
  • Early Solar System Chronology

Background:

  • Eucrites are igneous meteorites offering insights into early planetary differentiation and geophysical processes.
  • They represent some of the earliest igneous activity in the solar system, akin to processes on Asteroid 4 Vesta.
  • Dating these events helps constrain the thermal history of early planetesimals.

Purpose of the Study:

  • To precisely date the crystallization and metamorphism of eucrite meteorites.
  • To understand the thermal conditions and geological processes on the eucrite parent body in the early solar system.
  • To use short-lived radionuclides as precise chronometers for early solar system events.

Main Methods:

  • Utilized the short-lived radionuclide Hafnium-182 (¹⁸²Hf) as a relative chronometer.
  • Analyzed zircon crystallization ages within eucrite meteorites.
  • Determined the timing of later metamorphic events in relation to zircon crystallization.

Main Results:

  • Eucrite zircon crystallized rapidly, within 6.8 million years after metal-silicate differentiation.
  • Mantle differentiation occurred when sufficient internal heat from radioactive decay (e.g., ²⁶Al, ⁶⁰Fe) was available.
  • Eucrite metamorphism occurred at least 8.9 million years after zircon crystallization, suggesting impact-related heating.

Conclusions:

  • Eucrite formation and mantle differentiation were rapid early solar system events.
  • Impacts, rather than extensive lava flows, were likely the primary cause of later eucrite metamorphism.
  • This study provides critical timing constraints for the geophysical evolution of early planetesimals.