When did plate tectonics begin? Evidence from the geologic record

Kent C. Condie, Alfred Kröner

Research output: Contribution to journalArticle

195 Citations (Scopus)

Abstract

Modern-style plate tectonics can be tracked into the geologic past with petrotectonic assemblages and other plate-tectonic indicators. These indicators suggest that modern plate tectonics were operational, at least in some places on the planet, by 3.0 Ga, or even earlier, and that they became widespread by 2.7 Ga. The scarcity of complete ophiolites before 1 Ga may be explained by thicker oceanic crust and preservation of only the upper, basaltic unit. The apparent absence of blueschists and ultrahigh-pressure meta-morphic rocks before ca. 1 Ga may reflect steeper subduction geotherms and slower rates of uplift at convergent margins. It is unlikely that plate tectonics began on Earth as a single global "event" at a distinct time, but rather it is probable that it began locally and progressively became more widespread from the early to the late Archean.

Original languageEnglish
Pages (from-to)281-294
Number of pages14
JournalSpecial Paper of the Geological Society of America
Volume440
DOIs
Publication statusPublished - 2008
Externally publishedYes

Keywords

  • Archean tectonics
  • Mantle recycling
  • Plate tectonic assemblages
  • Plate tectonics

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