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Related Experiment Videos

Raising tibet.

T M Harrison, P Copeland, W S Kidd

    Science (New York, N.Y.)
    |March 27, 1992
    PubMed
    Summary
    This summary is machine-generated.

    Southern Tibet experienced rapid uplift and denudation starting 20 million years ago, reaching its current elevation by 8 million years ago. This enhanced early Miocene geological activity is explained by continental extrusion and lithospheric delamination.

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    Area of Science:

    • Geosciences
    • Tectonics
    • Paleoclimatology

    Background:

    • The India-Asia collision, initiating 40-50 million years ago, drives the tectonic evolution of southern Asia.
    • Existing models predict crustal thickening rates but fail to explain early Miocene uplift.
    • Geological records indicate significantly enhanced denudation and uplift during the early Miocene.

    Purpose of the Study:

    • To reconcile tectonic models with observed geological evidence of early Miocene uplift in southern Tibet.
    • To propose a new model explaining the timing and rates of uplift and denudation in the region.
    • To investigate the mechanisms behind the prominent early Miocene geological activity.

    Main Methods:

    • Integration of thermochronologic, sedimentologic, oceanographic, and paleoclimatic data.

    Related Experiment Videos

  • Analysis of geological records to determine uplift and denudation history.
  • Development and testing of a tectonic model incorporating continental extrusion and lithospheric delamination.

    • Main Results:

    • Rapid uplift and unroofing of southern Tibet commenced approximately 20 million years ago.
    • The Tibetan plateau achieved its present elevation around 8 million years ago.
    • Geological evidence points to a distinct phase of enhanced denudation during the early Miocene.

    Conclusions:

    • A model involving continental extrusion, a Main Central Thrust ramp beneath the Gangdese belt, and lithospheric delamination aligns with the observed geological history.
    • This proposed mechanism provides a comprehensive explanation for the enhanced early Miocene uplift and denudation.
    • The study refines our understanding of the complex tectonic processes governing the Himalayan-Tibetan orogeny.