Journal of Petrology Advance Access originally published online on February 25, 2005
Journal of Petrology 2005 46(7):1393-1420; doi:10.1093/petrology/egi020
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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
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
RECEIVED JUNE 10, 2004; ACCEPTED JANUARY 28, 2005
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.
KEY WORDS: contact metamorphism; U–Pb dating; hornblende; garnet; Mid-German Crystalline Rise; P–T pseudosection
* Corresponding author. Telephone: +49-931-888-5415. E-mail: armin.zeh{at}mail.uni-wuerzburg.de
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