GEOLOGIC THERMOBAROMETRY OF RETROGRADED METAMORPHIC ROCKS

AN INDICATION OF THE UPLIFT TRAJECTORY OF A PORTION OF THE NORTHERN SCANDINAVIAN CALEDONIDES.

Kip Hodges, L. Royden

Research output: Contribution to journalArticle

63 Citations (Scopus)

Abstract

Kyanite grade pelitic schists from the Efjord area (68 degree 15 prime N, 16 degree 45 prime E), northern Norway, show abundant textural evidence of retrograde reequilibration during late orogenic uplift and cooling of this part of the Scandinavian Caledonides. Graphical analysis of mineral compositions in seven samples that show a range of retrograde textures indicates that they reached final chemical equilibrium under nonuniform pressure-temperature conditions. Three element-partitioning geothermometers and geobarometers yield consistent PT estimates in individual samples, which together define a trend in PT space. The sample showing the fewest signs of retrogression yields the highest pressure and temperature estimates, whereas samples exhibiting abundant reequilibration textures give lower PT estimates. It is suggested that the trend indicated by these samples reflects a portion of the PT trajectory assumed by the Efjord area during uplift.

Original languageEnglish (US)
Pages (from-to)7077-7090
Number of pages14
JournalJournal of Geophysical Research
Volume89
Issue numberB8
StatePublished - Jan 1 1984
Externally publishedYes

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Metamorphic rocks
metamorphic rocks
metamorphic rock
indication
Kyanite
Textures
uplift
texture
trajectory
Trajectories
trajectories
retrogression
kyanite
schist
Minerals
partitioning
Cooling
cooling
estimates
textures

ASJC Scopus subject areas

  • Engineering(all)

Cite this

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abstract = "Kyanite grade pelitic schists from the Efjord area (68 degree 15 prime N, 16 degree 45 prime E), northern Norway, show abundant textural evidence of retrograde reequilibration during late orogenic uplift and cooling of this part of the Scandinavian Caledonides. Graphical analysis of mineral compositions in seven samples that show a range of retrograde textures indicates that they reached final chemical equilibrium under nonuniform pressure-temperature conditions. Three element-partitioning geothermometers and geobarometers yield consistent PT estimates in individual samples, which together define a trend in PT space. The sample showing the fewest signs of retrogression yields the highest pressure and temperature estimates, whereas samples exhibiting abundant reequilibration textures give lower PT estimates. It is suggested that the trend indicated by these samples reflects a portion of the PT trajectory assumed by the Efjord area during uplift.",
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