Methods to estimate the pressure-temperature histories of garnet peridotite and eclogite in the ultrahigh-pressure metamorphic belts: A review of geothermobarometers and their geological applications

Kosuke Naemura, Daisuke Nakamura, Takao Hirajima

Research output: Contribution to journalArticle

Abstract

Ultrahigh-pressure (UHP) metamorphic rocks, represented by coesite- or its pseudomorph-bearing eclogites, have been found mainly from continent-continent collision orogenic belts, and garnet peridotite bodies are also known to occur in such UHP belts. The UHP eclogites and garnet peridotite bodies/layers/lenses are commonly enclosed within metamorphic rocks derived from continent crustal materials composed by moderate to low pressure metamorphic minerals, although they should have been located under deep mantle depths (>50km). Therefore, elucidation of juxtaposition processes between the mantle material and the host crustal material is one of main subjects for the petrology in the UHP belts. Delineating of pressure-temperature (P-T) paths of these UHP garnet peridotite bodies can give us indispensable constraints to clarify the juxtaposition process of mantle and crustal materials in the continent-collision settings and the exhumation processes of deeply subducted rocks with higher density than the crustal rocks. In this paper, we summarize the commonly used methods to determine P-T histories of the UHP garnet peridotite bodies (i.e., geo-thermometer and barometer) and discuss P-T paths of UHP rocks in collision type orogenic belts, and their tectonic significance.

Original languageEnglish
Pages (from-to)225-246
Number of pages22
JournalJapanese Magazine of Mineralogical and Petrological Sciences
Volume41
Issue number6
DOIs
Publication statusPublished - 2012

Keywords

  • Barometer
  • Eclogite
  • Garnet peridotite
  • Pressure-temperature path
  • Thermometer
  • UHP metamorphism

ASJC Scopus subject areas

  • Geochemistry and Petrology
  • Economic Geology

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