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Precambrian perspectives.

A M Goodwin

    Science (New York, N.Y.)
    |July 3, 1981
    PubMed
    Summary
    This summary is machine-generated.

    The Precambrian crust evolved from mobile microplate tectonics to stable macroplate tectonics. This progression, driven by Earth

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    Area of Science:

    • Geology and Tectonics
    • Earth Science
    • Precambrian Geology

    Background:

    • The Precambrian geological record reveals a significant trend towards increasing continental stability over time.
    • Early Earth's crust experienced highly mobile microplate tectonics, contrasting with the modern macroplate tectonics.
    • Distinct crustal associations characterize different phases of Precambrian tectonic evolution.

    Purpose of the Study:

    • To interpret the Precambrian geological record in terms of continental stability evolution.
    • To identify the key controls driving tectonic and crustal development throughout Earth's history.
    • To understand the progression from early microplate tectonics to modern macroplate tectonics.

    Main Methods:

    • Analysis of the Precambrian geological record.

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  • Interpretation of tectonic phases: microplate, ensialic mobile belt, and macroplate tectonics.
  • Evaluation of controlling factors: bulk Earth heat production, crustal fractionation/cratonization, and atmospheric oxygen accumulation.

    • Main Results:

    • The Precambrian crust evolved through distinct tectonic phases: mobile microplate, stable intracratonic ensialic mobile belt, and modern macroplate tectonics.
    • These phases are associated with specific crustal types and formations.
    • Bulk Earth heat production, crustal processes, and atmospheric oxygen accumulation are identified as primary drivers of these evolutionary trends.

    Conclusions:

    • The Precambrian geological record demonstrates a clear evolutionary path towards greater continental stability.
    • Tectonic regimes and crustal development are fundamentally controlled by cumulative geological and atmospheric processes acting over billions of years.
    • Understanding these controls provides insight into the Earth's crustal evolution from its inception to the present day.