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

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

doi:10.5575/geosoc.100.50

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 journal › Article

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 language	English
Pages (from-to)	50-59
Number of pages	10
Journal	Journal - Geological Society of Japan
Volume	100
Issue number	1
DOIs	https://doi.org/10.5575/geosoc.100.50
Publication status	Published - Jan 1 1994
Externally published	Yes

All Science Journal Classification (ASJC) codes

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

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10.5575/geosoc.100.50

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Kumazawa, M., Yoshida, S., Ito, T., & Yoshioka, H. (1994). Archaean-Proterozoic boundary interpreted as a catastrophic collapse of the stable density stratification in the core. Journal - Geological Society of Japan, 100(1), 50-59. https://doi.org/10.5575/geosoc.100.50

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