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High-Mg potassic rocks in the Balkan segment of the Variscan belt (Bulgaria): implications for the genesis of orogenic lamproite magmas

Published online by Cambridge University Press:  27 October 2009

L. BUZZI ,
L. GAGGERO ,
L. GROZDANOV ,
S. YANEV  and
F. SLEJKO
L. BUZZI
Affiliation:
Department for the Study of Territory and its Resources, University of Genoa, Corso Europa 26, I-16132 Genoa, Italy
L. GAGGERO*
Affiliation:
Department for the Study of Territory and its Resources, University of Genoa, Corso Europa 26, I-16132 Genoa, Italy
L. GROZDANOV
Affiliation:
Geological Institute of the Bulgarian Academy of Sciences, G. Bonchev Str. Bl. 24, 1113 Sofia, Bulgaria
S. YANEV
Affiliation:
Geological Institute of the Bulgarian Academy of Sciences, G. Bonchev Str. Bl. 24, 1113 Sofia, Bulgaria
F. SLEJKO
Affiliation:
Department of Earth Sciences, University of Trieste, Via Weiss 8, I-34127 Trieste, Italy
*
†Author for correspondence: gaggero@dipteris.unige.it
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Abstract

Ultrapotassic plutons from several domains of the Variscan orogenic belt have been in turn interpreted as syn- to post-orogenic due to their age spread, but assessment of their geodynamic setting and source regions is still open to interpretation. In the Svoge region (Bulgaria), at the southern margin of the Balkan orogen, peralkalic plutons are hosted within Ordovician pelites. The main intrusion, with lamproitic affinity, which hosts monzodiorite xenoliths and a polyphase syenite suite, was emplaced at a shallow level. 40Ar–39Ar dating by step-heating of amphibole and biotite yielded a Early Carboniferous intrusion age for the main body (337 ± 4 and 339.1 ± 1.6 Ma). The lamproite intrusion is silica-rich compared with bona fide lamproites and characterized by moderate LILE and LaN/YbN enrichments. Sr and Nd isotopic data (initial ϵNd in the range −4.87 to −5.88) suggest an origin in a depleted lithospheric mantle, possibly refertilized by eo-Variscan subduction. The high-K syn-tectonic plutonism in several zones of the Variscan orogen (Bohemian, Austro-Alpine, Vosges, French and Corsica domains) is consistent with a derivation of high-K magmatism from partial melting of metasomatized mantle following the subduction along the collision front between Gondwana and Laurasia.

Keywords

ultrapotassic39Ar–40Ar datingSr–NdBalkan terraneEarly Carboniferoussyn-orogenic
Type
Original Article
Information
Geological Magazine , Volume 147 , Issue 3 , May 2010 , pp. 434 - 450
Copyright
Copyright © Cambridge University Press 2009

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