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Pressure--Temperature--Time Paths of Regional Metamorphism II. Their Inference and Interpretation using Mineral Assemblages in Metamorphic Rocks

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THOMPSON, A. B., ENGLAND, P. C.·1984·Journal of Petrology
DOI 10.1093/petrology/25.4.929
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Abstract

A companion paper (England & Thompson, 1984a) investigates the pressure-temperature-time (PTt) paths followed by rocks undergoing burial metamorphism in continental thickening events. This paper discusses problems involved in inferring such paths from the petrological data available in metamorphic rocks and—once such paths are determined—how they may be interpreted in terms of the thermal budgets of metamorphism. Each of the principal facies series (glaucophane-jadeite, andalusite- sillimanite and kyanite-sillimanite) may be encountered by rocks involved in the thickening and erosion of continental crust in a regime of average continental heat flow. The inference of a minimum thermal budget required for a given metamorphism depends strongly on a knowledge of the PTt paths followed by rocks during the metamorphism. Discrimination between possible thermal regimes is greatly enhanced if portions of PTt paths, rather than single PT points, are available, and additional constraint is possible if these paths are supplemented by geochronological, structural and heat flow data.

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Crossref · 10.1093/petrology/25.4.929

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  • The growth zoning of garnet in sample BAN030b provides confirmation of a temperature increase for the samples.

    “The growth zoning of garnet in sample BAN030b provides confirmation of a temperature increase for samples of the Thompson 1984, Thompson andEngland 1984), where the high temperature path represents the lower plate (Bancroft terrane + CMBbtz) and the medium temperature path the upper plate (Elzevir terrane).”

    From The role of excess oxygen for modeling high-Mn, low-Ca garnets in metapelites from the northern Central Metasedimentary Belt of the Grenville Province, Ontario, Canada (2021) · cites this paper as Thompson 1984

    Section 2.4 states that chemical zoning can indicate the direction of temperature change during mineral growth and gives an example of garnet growth zoning associated with increasing temperature. It does not discuss sample BAN030b or establish that its zoning confirms a temperature increase; that sample-specific conclusion is not supported by this source. (LLM, conf=0.85)

    Experimental — accuracy not yet measured

  • The growth zoning of garnet in sample BAN030b provides confirmation of a temperature increase for the samples.

    “The growth zoning of garnet in sample BAN030b provides confirmation of a temperature increase for samples of the Thompson 1984, Thompson andEngland 1984), where the high temperature path represents the lower plate (Bancroft terrane + CMBbtz) and the medium temperature path the upper plate (Elzevir terrane).”

    From The role of excess oxygen for modeling high-Mn, low-Ca garnets in metapelites from the northern Central Metasedimentary Belt of the Grenville Province, Ontario, Canada (2021) · cites this paper as Thompson and England 1984

    Section 2.4 (page not provided) says mineral growth zoning can indicate the direction of temperature change and gives garnet zoning during a reaction driven by increasing temperature as an example. It does not discuss sample BAN030b or establish that its zoning confirms a temperature increase. (LLM, conf=0.86)

    Experimental — accuracy not yet measured

  • The high temperature path represents the lower plate (Bancroft terrane + CMBbtz) and the medium temperature path represents the upper plate (Elzevir terrane).

    “The growth zoning of garnet in sample BAN030b provides confirmation of a temperature increase for samples of the Thompson 1984, Thompson andEngland 1984), where the high temperature path represents the lower plate (Bancroft terrane + CMBbtz) and the medium temperature path the upper plate (Elzevir terrane).”

    From The role of excess oxygen for modeling high-Mn, low-Ca garnets in metapelites from the northern Central Metasedimentary Belt of the Grenville Province, Ontario, Canada (2021) · cites this paper as Thompson 1984

    Section 3.1 distinguishes the thermal paths of rocks below thrust sheets from those within thrust sheets, and section 2.5 describes heating below a thrust surface and possible cooling above it. This supports a general lower-versus-upper-plate contrast, but the paper does not identify the Bancroft, CMBbtz, or Elzevir terranes with the claimed high- and medium-temperature paths. (LLM, conf=0.82)

    Experimental — accuracy not yet measured

  • The high temperature path represents the lower plate (Bancroft terrane + CMBbtz) and the medium temperature path represents the upper plate (Elzevir terrane).

    “The growth zoning of garnet in sample BAN030b provides confirmation of a temperature increase for samples of the Thompson 1984, Thompson andEngland 1984), where the high temperature path represents the lower plate (Bancroft terrane + CMBbtz) and the medium temperature path the upper plate (Elzevir terrane).”

    From The role of excess oxygen for modeling high-Mn, low-Ca garnets in metapelites from the northern Central Metasedimentary Belt of the Grenville Province, Ontario, Canada (2021) · cites this paper as Thompson and England 1984

    Section 3.1 discusses modeled pressure–temperature paths for rocks above and below thrust sheets, but does not assign high- and medium-temperature paths to the named plates or terranes. Searches for Bancroft, CMBbtz, Elzevir, and the proposed upper-/lower-plate assignment found no passage addressing that mapping. (LLM, conf=0.76)

    Experimental — accuracy not yet measured

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Cites

No references could be resolved yet.

Research works printed but not linked: 12

  1. Bryhni, I., Krogh, E. J., & Griffin, W. L., 1977. Cmstal derivation of Norwegian eclogites: a review. Neues. Jb. Miner. Abh. 130,49-68.
  2. & Pankhurst, R. J., 1970. The evolution of the Scottish Caledonides in relation to their isotopic age pattern. Trans. R. Soc. Edlnb. 68, 361-90.
  3. Dodson, M. H., 1973. Closure temperature in cooling geochronological systems. Contr. Miner. Petrol. 40,259-74. 1979. Theory of cooling ages. In: Jager, E., & Hunziker, J. C. (eds.) Lectures in Isotope Geology. Berlin: Springer-Verlag.
  4. & Thompson, A. B., 1984a. Pressure-temperature-time paths of regional metamorphism, Part I: Heat transfer during the evolution of regions of thickened continental crust. J. Petrology, 25, 894-928. , 19846. Thermal requirements for crustal melting in continental collision zones. J. geol. Soc. Lond. in press.
  5. Essene, E. J., 1982. Geologic thermometry and barometry. In: Ferry, J. M. (ed.) Characterization of meta- morphism through mineral equilibria. Miner. Soc. Am. Rev. Mineralogy, 10, 153-206.
  6. Frey, M., Hunziker, J. C, Frank, W., Bocquet, J., Dal Piaz, G. V., Jager, E., & Niggli, E., 1974. Alpine meta- morphism of the Alps: a review. Schweiz. miner, petrogr. Mitt. 54, 247-90.
  7. Fyfe, W. S., Price, N. J., & Thompson, A. B., 1978. Fluids in the Earth's Crust. Amsterdam: Elsevier.
  8. Kidd, W. S. F., 1975. Widespread late Neogene and Quaternary calc-alkaline vulcanism on the Tibetan plateau. EOS. Trans. Am. geophys. Union, 56, 453.
  9. Lasaga, A. C, 1983. Geospecdometry: an extension of geothermometry. In: Saxena, S. K. (ed.) Kinetics and Equilibrium in Mineral Reactions. Springer-Verlag.
  10. Richardson, S. M., & Holland, H. D., 1977. Mathematics of a cation diffusion and exchange between silicate minerals during retrograde metamorphism. In: Saxena, S. K., & Bhattacharji, S. (eds.) Energetics of Geological Processes. Springer-Verlag.
  11. Ramsay, J. G., 1963. Structure and metamorphism of the Moine and Lewisian rocks of the northwest Caledonides. In: Johnson, M. R. W., & Stewart, F. H. (eds.), The British Caledonides. Edinburgh: Oliver & Boyd, 143-75.
  12. Rast, N., 1965. Nucleation and growth of metamorphic minerals. In: Pitcher, W. S., & Flinn, G. W. (eds.), Controls of Metamorphism. Edinburgh: Oliver & Boyd, 73-102.

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Authors
THOMPSON, A. B., & ENGLAND, P. C.
Affiliations
  • ETH Zurich (CH)
  • Harvard University (US)
ORCID
ENGLAND, P. C.
Venue
Journal of Petrology
Publisher
Oxford University Press (OUP)
Published
1984-11-01
Volume
25
Issue
4
Pages
929-955
ISSN
  • 0022-3530 (ISSN-L)
  • 1460-2415
DOI
10.1093/petrology/25.4.929
OpenAlex
W2314268432
Cited by
624
References
0
Citations by year
2026: 9 · 2025: 13 · 2024: 16 · 2023: 19 · 2022: 10 · 2021: 19 · 2020: 18 · 2019: 39 · 2018: 17 · 2017: 29 · 2016: 16 · 2015: 12 · 2014: 22 · 2013: 17 · 2012: 9
FWCI
10.41
Type
journal article
Language
en
Open access
Locations
  • Journal of Petrology (publishedVersion)
  • Repository for Publications and Research Data (ETH Zurich) (submittedVersion, other-oa)
  • ETH Zürich Research Collection
Funders
  • National Science Foundation
  • Schweizerischer Nationalfonds zur Förderung der Wissenschaftlichen Forschung
Topics
  • Physical Sciences › Earth and Planetary Sciences › Geophysics › Geological and Geochemical Analysis
  • Physical Sciences › Earth and Planetary Sciences › Geophysics › Geological and Geophysical Studies Worldwide
  • Physical Sciences › Earth and Planetary Sciences › Geophysics › High-pressure geophysics and materials
Keywords
pressure-temperature-time paths, regional metamorphism, mineral assemblages, continental crust thickening, geochronology

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