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Very high-pressure orogenic garnet peridotites.

J G Liou1, R Y Zhang, W G Ernst

  • 1Department of Geological and Environmental Sciences, Stanford University, Stanford, CA 94305, USA.

Proceedings of the National Academy of Sciences of the United States of America
|May 24, 2007
PubMed
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Garnet peridotites from continental subduction zones reveal new mineral phases and microstructures. Advanced characterization techniques provide deeper insights into deep mantle processes.

Area of Science:

  • Geology
  • Mineralogy
  • Petrology

Background:

  • Mantle-derived garnet peridotites are found in high-pressure metamorphic terranes.
  • These rocks form during continental subduction and collision events.
  • They contain trace zircon and micro-inclusions with complex microstructures.

Purpose of the Study:

  • To investigate the microstructures and mineralogy of mantle-derived garnet peridotites.
  • To understand mineral transformations and exsolution during subduction.
  • To utilize advanced techniques for detailed characterization.

Main Methods:

  • Experimental petrology
  • Mineralogical analysis
  • Petrochemical analysis
  • Geochronological studies

Related Experiment Videos

  • High-resolution imaging and spectroscopy

    • Main Results:

    • Observed pre- and postsubduction microstructures in constituent minerals.
    • Identified polymorphic transformations and mineral exsolution.
    • Discovered new mineral phases through advanced characterization.

    Conclusions:

    • Novel techniques reveal unexpected mineral phases in garnet peridotites.
    • These findings enhance understanding of deep mantle processes during subduction.
    • Detailed characterization provides better constraints on mantle evolution.