Cited by 413Geological and Geochemical AnalysisHigh-pressure geophysics and materialsGeochemistry and Geochronology of Asian Mineral Deposits

Global UHP metamorphism and continental subduction/collision: The Himalayan model

Liou, J. G., Tsujimori, T., Zhang, R. Y., Katayama, I., Maruyama, S.·2004·International Geology Review

Abstract

Continental crust (density ~2.8 g·cm-3) resists subduction into the earth's mantle (~3.3 g·cm-3) because of buoyancy. However, more than 20 recognized ultrahigh-pressure (UHP) terranes have been documented; these occurrences demonstrate that not only is continental crust subducted to depths as great as 150 km, but also that some supracrustal rocks were then exhumed to the earth's surface. UHP terranes are composed of mainly supracrustal rocks that contain minor amounts of minerals such as coesite or diamond, indicative of P > 2.5 GPa. In general, quartzofeldspathic units are thoroughly back reacted, and only mafic eclogite lenses and boudins retain scattered UHP phases. These index minerals are restricted to micron-scale inclusions in chemically and mechanically resistant zircon, garnet, and a few other strong container minerals, and are difficult to identify by conventional petrologic studies. The continental rocks were subjected to UHP metamorphism at T ranging from ~700 to 950°C and P > 2.8 to 5.0 GPa, corresponding to depths of ~100 to 150 km. These UHP units were subsequently exhumed to crustal depths and subjected to intense hydration and amphibolite-facies overprint. Widespread Barrovian-type metamorphism in many collisional orogens may mask an earlier, higher-pressure metamorphic history. We suspect that coesite-bearing UHP rocks were once generated in the majority of exhumed collisional orogens. The recent finding of coesite inclusions in rare Himalayan eclogites and country rock gneisses is a typical example. We use the Himalayan model to illustrate UHP metamorphism and subduction of continental crustal rocks to mantle depths and later Barrovian-type overprint during exhumation. Himalayan UHP eclogites and adjacent gneisses were formed at mantle depths > 100 km at 46 to 52 Ma. These rocks were exhumed to crustal depths and subjected to Barrovian amphibolite- to granulite-facies metamorphism; associated magmatism occurred at 30 to 15 Ma. The Himalayan metamorphic belt was domally uplifted and the mountain-building process initiated since 11 Ma, when underthrusting of the Indian tectosphere beneath the Lesser Himalayas occurred.

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Crossref · 10.2747/0020-6814.46.1.1

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  • UHP metamorphism is defined in silica-bearing rocks by the stabilization of coesite, which occurs at ~90-100 km depth below Earth's surface, assuming lithostatic pressure.

    “Ultrahigh-pressure (UHP) metamorphism is defined in silicabearing rocks by the stabilization of coesite (Chopin, 1984;Smith, 1984) a high-pressure polymorph of quartzwhich occurs at ~90-100 km depth below the Earth's surface, assuming lithostatic pressure”

    From Secular change and the onset of plate tectonics on Earth (2020) · cites this paper as Liou et al., 2004

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Authors
Liou, J. G., Tsujimori, T., Zhang, R. Y., Katayama, I., & Maruyama, S.
Affiliations
  • Stanford University (US)
  • Tokyo Institute of Technology (JP)
Venue
International Geology Review
Published
2004-01
Volume
46
Issue
1
Pages
1-27
ISSN
  • 0020-6814 (ISSN-L)
  • 1938-2839
OpenAlex
W2031255348
Cited by
413
References
130
Citations by year
2026: 7 · 2025: 7 · 2024: 5 · 2023: 20 · 2022: 16 · 2021: 16 · 2020: 21 · 2019: 67 · 2018: 23 · 2017: 20 · 2016: 16 · 2015: 21 · 2014: 14 · 2013: 21 · 2012: 22
FWCI
9.78
Type
journal article
Language
en
Open access
closed
Locations
  • International Geology Review (publishedVersion)
  • Tokyo Tech Research Repository (Tokyo Institute of Technology) (submittedVersion)
Funders
  • National Science Foundation
  • Japan Society for the Promotion of Science
Topics
  • Physical Sciences › Earth and Planetary Sciences › Geophysics › Geological and Geochemical Analysis
  • Physical Sciences › Earth and Planetary Sciences › Geophysics › High-pressure geophysics and materials
  • Social Sciences › Economics, Econometrics and Finance › Economics and Econometrics › Geochemistry and Geochronology of Asian Mineral Deposits
Keywords
ultrahigh-pressure metamorphism, continental subduction, continental collision, Himalayan orogen, coesite, diamond, eclogite, exhumation, Barrovian metamorphism, Lesser Himalaya, underthrusting

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