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Evolution of the continental crust

Author

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  • C. J. Hawkesworth

    (University of Bristol)

  • A. I. S. Kemp

    (University of Bristol
    James Cook University)

Abstract

The continental crust covers nearly a third of the Earth’s surface. It is buoyant—being less dense than the crust under the surrounding oceans—and is compositionally evolved, dominating the Earth’s budget for those elements that preferentially partition into silicate liquid during mantle melting. Models for the differentiation of the continental crust can provide insights into how and when it was formed, and can be used to show that the composition of the basaltic protolith to the continental crust is similar to that of the average lower crust. From the late Archaean to late Proterozoic eras (some 3–1 billion years ago), much of the continental crust appears to have been generated in pulses of relatively rapid growth. Reconciling the sedimentary and igneous records for crustal evolution indicates that it may take up to one billion years for new crust to dominate the sedimentary record. Combining models for the differentiation of the crust and the residence time of elements in the upper crust indicates that the average rate of crust formation is some 2–3 times higher than most previous estimates.

Suggested Citation

  • C. J. Hawkesworth & A. I. S. Kemp, 2006. "Evolution of the continental crust," Nature, Nature, vol. 443(7113), pages 811-817, October.
    • Handle: RePEc:nat:nature:v:443:y:2006:i:7113:d:10.1038_nature05191
    DOI: 10.1038/nature05191
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    Cited by:

    1. David A. Holwell & Marco L. Fiorentini & Thomas R. Knott & Iain McDonald & Daryl E. Blanks & T. Campbell McCuaig & Weronika Gorczyk, 2022. "Mobilisation of deep crustal sulfide melts as a first order control on upper lithospheric metallogeny," Nature Communications, Nature, vol. 13(1), pages 1-12, December.

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