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Area of Science:

  • Geophysics
  • Petrology
  • Tectonics

Background:

  • The lower crust and crust-mantle boundary are critical to understanding Earth's structure.
  • Eclogitization of lower crustal rocks typically leads to delamination, a process not observed in this study.

Purpose of the Study:

  • To investigate the long-term stability of lower crustal eclogite.
  • To challenge conventional models of lithosphere evolution and cratonic crust stability.

Main Methods:

  • Acquisition and analysis of new wide-angle seismic data from the Paleoproterozoic Fennoscandian Shield.
  • Interpretation of seismic velocities and densities to infer rock composition and structure.

Main Results:

  • Identification of a 6-8 km thick body with high seismic velocity (Vp ~ 8.5-8.6 km/s) and density (>3.4 g/cm³).
  • This body lies beneath a thinned, high-velocity (Vp ~ 7.3-7.4 km/s) lowermost crustal layer extending over >350 km.
  • Evidence suggests partial transformation (50-70%) of mafic lower crust into eclogite during Paleoproterozoic orogeny without subsequent delamination.

Conclusions:

  • The study provides evidence for the long-term presence of lower crustal eclogite beneath the seismic Moho.
  • Findings challenge the expected role of eclogitization and delamination in lithosphere evolution and cratonic crust stability.