Archean upper crust transition from mafic to felsic marks the onset of plate tectonics

Author:

Tang Ming12,Chen Kang13,Rudnick Roberta L.1

Affiliation:

1. Department of Geology, University of Maryland, College Park, MD 20742, USA.

2. Corresponding author.

3. State Key Laboratory of Geological Processes and Mineral Resources, School of Earth Sciences, China University of Geosciences, Wuhan 430074, China.

Abstract

New crustal clues from old rocks The ghost of continental crust long eroded away may exist in certain element ratios found in Archean rocks. Tang et al. used Ni/Co and Cr/Zn ratios as a proxy for the magnesium oxide that long ago weathered away in Earth's oldest rocks. This allowed a reconstruction of rock composition, which appears to be very different from that of the crust today. The shift to contemporary crust composition occurred after the Archean era, suggesting the onset of plate tectonics. Science , this issue p. 372

Funder

NSF

Wylie Fellowship

Publisher

American Association for the Advancement of Science (AAAS)

Subject

Multidisciplinary

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