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Journal of Petrology Advance Access published online on February 21, 2006
Journal of Petrology, doi:10.1093/petrology/egl001
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© The Author 2006. Published by Oxford University Press. All rights reserved. For Permissions, please e-mail: journals.permissions@oxfordjournals.org
Received January 21, 2005
Accepted January 11, 2006

Article

Very Low-grade Metamorphic Evolution of Pelitic Rocks under High-pressure/Low-temperature Conditions, NW New Caledonia (SW Pacific)

S. POTEL 1 *, R. FERREIRO MÄHLMANN 2, W. B. STERN 1, J. MULLIS 1, and M. FREY 1 {ddagger}

1 MINERALOGISCH-PETROGRAPHISCHES INSTITUT DER UNIVERSITÄT BASEL, BERNOULLISTRASSE 30, CH-4056 BASEL, SWITZERLAND
2 MINERALOGISCH-PETROGRAPHISCHES INSTITUT DER UNIVERSITÄT BASEL, BERNOULLISTRASSE 30, CH-4056 BASEL, SWITZERLAND; Present address: Fachbereich Material- und Geowissenschaften, Technische Petrologie, Schnittspahnstrasse 9, D-64287 Darmstadt, Germany

* To whom correspondence should be addressed.
S. POTEL, E-mail: s.potel{at}em.uni-frankfurt.de


  Abstract

The P-T gradient in a Late Eocene low-T high-P metamorphic belt in northern New Caledonia increases from SW to NE. Metapelites in the pumpellyite-prehnite and blueschist zones contain lawsonite, Mg-carpholite, Fe-stilpnomelane and Fe-glaucophane. Thermodynamic calculations indicate a progression of metamorphic conditions from less than 0·3 GPa and 250°C in a kaolinite-bearing rock in the SW, up to 1·5 GPa and 410°C in a lawsonite-glaucophane-bearing sample in the NE of the Diahot terrane. Through a multi-method investigation of phyllosilicates, organic matter and fluid inclusions, we demonstrate that the evolution of organic matter and illite crystallinity depends strongly on the evolution of the P-T path with time. In addition, we show that the illite-muscovite b cell dimension provides a robust estimate of maximum pressure reached in low-temperature domains with polyphase metamorphic histories, despite subsequent high-temperature-low-pressure events. Fluid inclusion study reveals an isothermal decompression in the Diahot terrane.

Keywords: low-temperature/high-pressure metapelites; illite crystallinity; coal rank; illite-muscovite b cell dimension; New Caledonia.
{ddagger}Martin Frey died in an accident in the Swiss Alps on September 10, 2000. Our work is dedicated to him, an excellent researcher and a friendly colleague
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