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Journal of Petrology 2004 45(7):1393-1412; doi:10.1093/petrology/egh017
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Journal of Petrology 45(7) © Oxford University Press 2004; all rights reserved

Metapelites of the Kanskiy Granulite Complex (Eastern Siberia): Kinked P–T Paths and Geodynamic Model

TARAS V. GERYA1,2,* and WALTER V. MARESCH2

1 INSTITUTE OF EXPERIMENTAL MINERALOGY, RUSSIAN ACADEMY OF SCIENCES, CHERNOGOLOVKA, MOSCOW DISTRICT, 142432, RUSSIA
2 INSTITUT FÜR GEOLOGIE, MINERALOGIE UND GEOPHYSIK, RUHR-UNIVERSITÄT BOCHUM, UNIVERSITÄTSTRASSE 150, 44780 BOCHUM, GERMANY

* Corresponding author. Present address: Institut für Geologie, Mineralogie und Geophysik, Ruhr-Universität Bochum, Universitätstrasse 150, 44780 Bochum, Germany. Telephone: 49-234-3223518. Fax: 49-234-3214433. E-mail: taras.gerya{at}ruhr-uni-bochum.de

The Southern Yenisey Range (Eastern Siberia) consists of the granulite-facies Kanskiy complex bordered by the lower-grade Yeniseyskiy and Yukseevskiy complexes. Samples of metapelite of the Kanskiy complex typically show characteristic garnet-forming reaction textures and near-isobaric cooling P–T paths. An important new result of this study concerns the difference in shape of the P–T paths from different parts of the Kanskiy granulite complex: metapelites collected ~8 km from the boundary with the Yeniseyskiy complex followed a linear path with dP/dT {approx} 0·006 kbar/°C; metapelites collected ~3 km from this boundary reveal a kinked P–T path with an interval of burial cooling (dP/dT {approx} –0·006 kbar/°C). The difference in the shape of the P–T paths is supported by the chemical zoning of garnet studied in the second group of samples. A mechanism of buoyant exhumation of granulite is suggested by comparison with the results of numerical modelling, which indicate that such a diversity of P–T paths may result from a transient disturbance of the thermal structure by rapid differential movement of material from different crustal levels. To arrive at a correct tectonic interpretation, the whole assemblage of interrelated P–T paths of metamorphic rocks collected from different localities within the same complex must be studied.

KEY WORDS: crustal diapirism; exhumation; granulites; numerical modelling; P–T path


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