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The charnockite geotherm.

S K Saxena

    Science (New York, N.Y.)
    |November 11, 1977
    PubMed
    Summary
    This summary is machine-generated.

    Charnockite rocks globally indicate formation at 800-900°C and shallow depths. This suggests high geothermal gradients existed, with the latest around 1.3 billion years ago.

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    Area of Science:

    • Geology
    • Petrology
    • Geochemistry

    Background:

    • Charnockite and associated rocks exhibit a worldwide distribution.
    • Understanding their formation conditions provides insights into Earth's crustal processes.

    Purpose of the Study:

    • To determine the formation temperatures and depths of charnockite rocks.
    • To investigate the associated geothermal gradients and their timing.

    Main Methods:

    • Mineral-chemical analysis of charnockite samples.
    • Experimental phase equilibrium studies.
    • Geological and petrological investigations.

    Main Results:

    • Charnockite rocks formed or recrystallized at temperatures of 800-900°C.

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  • These rocks originated at shallow crustal depths, between 6 and 12 kilometers.
  • Evidence points to geothermal gradients ranging from 70 to 100°C/km.

    • Conclusions:

    • The formation conditions of charnockite suggest significant thermal gradients in the crust.
    • The latest period of charnockite formation or recrystallization occurred approximately 1.3 billion years ago.
    • These findings contribute to understanding ancient geothermal regimes and crustal evolution.