Rapid formation and exhumation of the youngest Alpine eclogites: A thermal conundrum to Barrovian metamorphism

Andrew James Smye, Mike J. Bickle, Tim J.B. Holland, Randall R. Parrish, Dan J. Condon

Research output: Contribution to journalArticle

27 Citations (Scopus)

Abstract

Eclogite facies metamorphic rocks provide critical information pertaining to the timing of continental collision in zones of plate convergence. Despite being amongst Earth's best studied orogens, little is understood about the rates of Alpine metamorphism within the Eastern Alps. We present LA-MC-ICPMS and ID-TIMS U-Pb ages of metamorphic allanite from the Eclogite Zone, Tauern Window, which when coupled with rare earth element analysis and thermobarometric modelling, demonstrate that the European continental margin was subducted to between 8 and 13kbar (30-45km) by 34.2±3.6Ma. These data define: (i.) an upper limit on the timing of eclogite facies metamorphism at 26.2±1.8kbar (70-80km) and 553±12°C, (ii.) plate velocity (1-6cm.a-1) exhumation of the Eclogite Zone from mantle to mid-crustal depths, and (iii.) a maximum duration of 10Ma (28-38Ma) for juxtaposition of Alpine upper-plate and European basement units and subsequent conductive heating thought to have driven regional Barrovian (re)crystallisation at ca. 30Ma. One-dimensional thermal modelling of tectonically thickened crust shows that conductive heating is too slow to account for Tauern Barrovian conditions (550°C at 9-13kbar) within the maximum 10Ma interval between eclogite exhumation and the thermal peak (28-32Ma). Given that the Tauern Window is a classic locality for understanding rates of conductive thermal relaxation in tectonically thickened crust, this work raises questions of fundamental importance concerning the length scales of the mechanisms responsible for heat transfer within orogenic crust.

Original languageEnglish (US)
Pages (from-to)193-204
Number of pages12
JournalEarth and Planetary Science Letters
Volume306
Issue number3-4
DOIs
StatePublished - Jun 15 2011

Fingerprint

eclogite
exhumation
metamorphism
crusts
Metamorphic rocks
Heating
crust
Rare earth elements
time measurement
heating
allanite
Earth (planet)
plate convergence
metamorphic rocks
Heat transfer
continental collision
continental shelves
basements
metamorphic rock
modeling

All Science Journal Classification (ASJC) codes

  • Geophysics
  • Geochemistry and Petrology
  • Earth and Planetary Sciences (miscellaneous)
  • Space and Planetary Science

Cite this

Smye, Andrew James ; Bickle, Mike J. ; Holland, Tim J.B. ; Parrish, Randall R. ; Condon, Dan J. / Rapid formation and exhumation of the youngest Alpine eclogites : A thermal conundrum to Barrovian metamorphism. In: Earth and Planetary Science Letters. 2011 ; Vol. 306, No. 3-4. pp. 193-204.
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Rapid formation and exhumation of the youngest Alpine eclogites : A thermal conundrum to Barrovian metamorphism. / Smye, Andrew James; Bickle, Mike J.; Holland, Tim J.B.; Parrish, Randall R.; Condon, Dan J.

In: Earth and Planetary Science Letters, Vol. 306, No. 3-4, 15.06.2011, p. 193-204.

Research output: Contribution to journalArticle

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T1 - Rapid formation and exhumation of the youngest Alpine eclogites

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AU - Smye, Andrew James

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