Pressure-temperature evolution of primordial solar system solids during impact-induced compaction

P. A. Bland, G. S. Collins, T. M. Davison, N. M. Abreu, F. J. Ciesla, A. R. Muxworthy, J. Moore

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Abstract

Prior to becoming chondritic meteorites, primordial solids were a poorly consolidated mix of mm-scale igneous inclusions (chondrules) and high-porosity sub-μm dust (matrix). We used high-resolution numerical simulations to track the effect of impact-induced compaction on these materials. Here we show that impact velocities as low as 1.5 km s-1 were capable of heating the matrix to >1,000 K, with pressure-temperature varying by >10 GPa and >1,000 K over ~100 μm. Chondrules were unaffected, acting as heat-sinks: matrix temperature excursions were brief. As impact-induced compaction was a primary and ubiquitous process, our new understanding of its effects requires that key aspects of the chondrite record be re-evaluated: palaeomagnetism, petrography and variability in shock level across meteorite groups. Our data suggest a lithification mechanism for meteorites, and provide a 'speed limit; constraint on major compressive impacts that is inconsistent with recent models of solar system orbital architecture that require an early, rapid phase of main-belt collisional evolution.

Original languageEnglish (US)
Article number5451
JournalNature communications
Volume5
DOIs
StatePublished - 2014

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All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Biochemistry, Genetics and Molecular Biology(all)
  • Physics and Astronomy(all)

Cite this

Bland, P. A., Collins, G. S., Davison, T. M., Abreu, N. M., Ciesla, F. J., Muxworthy, A. R., & Moore, J. (2014). Pressure-temperature evolution of primordial solar system solids during impact-induced compaction. Nature communications, 5, [5451]. https://doi.org/10.1038/ncomms6451