P-T paths from garnet zoning: a new technique for deciphering tectonic processes in crystalline terranes.

F. S. Spear, J. Selverstone, D. Hickmott, P. Crowley, Kip Hodges

Research output: Contribution to journalArticle

Abstract

A procedure for calculating quantitative rock P-T paths from garnet zoning involves formulating the P and T of the rock as a function of n composition parameters, where n is the thermodynamic variance of the assemblage. Application of the technique to samples from diverse tectonic settings has shown that the calculated P-T path is a sensitive monitor of tectonic processes. Terrains where metamorphic recrystallization paths are controlled by uplift and erosion show heating during decompression in the 'prograde' P-T path and cooling during decompression in the 'retrograde' path. In nappe terrains where hot rocks are emplaced over cool rocks, the upper plate shows cooling during compression, whereas the lower plate shows heating during decompression.-L.H.

Original languageEnglish (US)
Pages (from-to)87-90
Number of pages4
JournalGeology
Volume12
Issue number2
DOIs
StatePublished - Jan 1 1984
Externally publishedYes

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zoning
terrane
garnet
decompression
tectonics
rock
heating
cooling
nappe
tectonic setting
thermodynamics
uplift
compression
erosion

ASJC Scopus subject areas

  • Geology

Cite this

P-T paths from garnet zoning : a new technique for deciphering tectonic processes in crystalline terranes. / Spear, F. S.; Selverstone, J.; Hickmott, D.; Crowley, P.; Hodges, Kip.

In: Geology, Vol. 12, No. 2, 01.01.1984, p. 87-90.

Research output: Contribution to journalArticle

Spear, F. S. ; Selverstone, J. ; Hickmott, D. ; Crowley, P. ; Hodges, Kip. / P-T paths from garnet zoning : a new technique for deciphering tectonic processes in crystalline terranes. In: Geology. 1984 ; Vol. 12, No. 2. pp. 87-90.
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