Archaean-Proterozoic boundary interpreted as a catastrophic collapse of the stable density stratification in the core

M. Kumazawa, S. Yoshida, T. Ito, H. Yoshioka

Research output: Contribution to journalArticle

10 Citations (Scopus)

Abstract

Stable density stratification in the Early Earth's core is an inevitable consequence of the core formation in the growing Earth. The evolution of the stratified layer is discussed and a possible mechanism leading to the present core, in which no significant stratification exists is proposed. The stratification collapsed within a very short period of time by tidal resonance of inertial gravity wave and the resulting wave-breaking and mixing. A possibility is discussed regarding the identification of this hypothetical catastrophic event with the Archaean-Proterozoic boundary located at 2.7 to 2.8 Ga ago, when palaeomagnetic evidences mark intensification of geodynamo and also the radiometric ages of igneous rocks show a conspicuous clustering. -from Authors

Original languageEnglish
Pages (from-to)50-59
Number of pages10
JournalJournal - Geological Society of Japan
Volume100
Issue number1
DOIs
Publication statusPublished - Jan 1 1994
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Environmental Science(all)
  • Engineering(all)
  • Earth and Planetary Sciences(all)

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