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Journal of Petrology Advance Access published online on February 25, 2005
Journal of Petrology, doi:10.1093/petrology/egi020
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© The Author 2005. Published by Oxford University Press. All rights reserved. For Permissions, please email: journals.permissions@oupjournals.org
Received June 10, 2004
Accepted January 28, 2005

Article

Provenance and Magmatic-Metamorphic Evolution of a Variscan Island-Arc Complex: Constraints from U-Pb Dating, Petrology, and Geospeedometry of the Kyffhäuser Crystalline Complex, Central Germany

ARMIN ZEH 1*, AXEL GERDES 2, THOMAS M. WILL 1, and IAN L. MILLAR 3

1 MINERALOGISCHES INSTITUT, AM HUBLAND, D-97074 WÜRZBURG, GERMANY
2 INSTITUT FÜR MINERALOGIE, SENCKENBERG ANLAGE 28, D-60054 FRANKFURT AM MAIN, GERMANY
3 BRITISH ANTARCTIC SURVEY, c/o NERC ISOTOPE GEOSCIENCES LABORATORY, KINGSLEY DUNHAM CENTRE, KEYWORTH, NOTTINGHAM NG12 5GG, UK

* To whom correspondence should be addressed.
ARMIN ZEH, E-mail: armin.zeh{at}mail.uni-wuerzburg.de


  Abstract

The Kyffhäuser Crystalline Complex, Central Germany, forms part of the Mid-German Crystalline Rise, which is assumed to represent the Variscan collision zone between the East Avalonian terrane and the Armorican terrane assemblage. High-precision U-Pb zircon and monazite dating indicates that sedimentary rocks of the Kyffhäuser Crystalline Complex are younger than c. 470 Ma and were intruded by gabbros and diorites between 345 ± 4 and 340 ± 1 Ma. These intrusions had magmatic temperatures between 850 and 900°C, and caused a contact metamorphic overprint of the sediments at P-T conditions of 690-750°C and 5-7 kbar, corresponding to an intrusion depth of 19-25 km. At 337 ± 1 Ma the magmatic-metamorphic suite was intruded by granites, syenites and diorites at a shallow crustal level of some 7-11 km. This is inferred from a diorite, and conforms to P-T paths obtained from the metasediments, indicating a nearly isothermal decompression from 5-7 to 2-4 kbar at 690-750°C. Subsequently, the metamorphic-magmatic sequence underwent accelerated cooling to below 400°C, as constrained by garnet geospeedometry and a previously published K-Ar muscovite age of 333 ± 7 Ma. With respect to P-T-D-t data from surrounding units, rapid exhumation of the KCC can be interpreted to result from NW-directed crustal shortening during the Viséan.

Keywords: contact metamorphism; U-Pb dating; hornblende; garnet; Mid-German Crystalline Rise; P-T pseudosection.
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