Universität zu Köln

Miladinova, Irena ORCID: 0000-0002-2808-0378, Froitzheim, Nikolaus, Nagel, Thorsten J., Janak, Marian, Georgiev, Neven ORCID: 0000-0003-2849-5845, Fonseca, Raul O. C. ORCID: 0000-0002-0897-4884, Sandmann, Sascha and Muenker, Carsten (2018). Late Cretaceous eclogite in the Eastern Rhodopes (Bulgaria): evidence for subduction under the Sredna Gora magmatic arc. Int. J. Earth Sci., 107 (6). S. 2083 - 2100. NEW YORK: SPRINGER. ISSN 1437-3262

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Abstract

The Rhodopes in Bulgaria and Greece represent a nappe stack of high-grade units with polymetamorphic history. Constraining the time of metamorphism in individual subunits is essential for unraveling the controversial framework of subduction, exhumation and nappe stacking. Here we present new evidence for Late Cretaceous high-pressure metamorphism in the Eastern Rhodopes. In eclogite from the Byala Reka-Kechros Dome (Kazak eclogite), garnet growth is dated at 81.6 +/- 3.5 Ma by Lu-Hf chronometry, indicating that prograde eclogite-facies metamorphism occurred during the Late Cretaceous. Petrological data and modeling suggest peak-pressure conditions of 1.2-1.6 GPa, 570-620 A degrees C. We propose that metamorphism took place in a subduction zone dipping towards north under the Sredna Gora section of the Apuseni-Banat-Timok-Sredna Gora continental magmatic arc. Eclogite-facies metamorphism coincides with the main phase of granitoid intrusions in the Sredna Gora Zone. The site of magmatic activity in this area shifted southward during the Late Cretaceous and arrived in the Eastern Rhodopes at similar to 69 Ma, as shown by granite intrusions of that age only 4 km north of the locality of the dated eclogite sample. This proximity may be explained by south-directed rollback of the subduction zone, although also post-69 Ma tectonic displacement has to be considered. Together with published age data from other parts of the Rhodopes, the new data confirm that multiple subduction events took place between similar to 200 and similar to 40 Ma along this section of the southern European plate boundary.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Miladinova, Irena UNSPECIFIED orcid.org/0000-0002-2808-0378 UNSPECIFIED Froitzheim, Nikolaus UNSPECIFIED UNSPECIFIED UNSPECIFIED Nagel, Thorsten J. UNSPECIFIED UNSPECIFIED UNSPECIFIED Janak, Marian UNSPECIFIED UNSPECIFIED UNSPECIFIED Georgiev, Neven UNSPECIFIED orcid.org/0000-0003-2849-5845 UNSPECIFIED Fonseca, Raul O. C. UNSPECIFIED orcid.org/0000-0002-0897-4884 UNSPECIFIED Sandmann, Sascha UNSPECIFIED UNSPECIFIED UNSPECIFIED Muenker, Carsten UNSPECIFIED UNSPECIFIED UNSPECIFIED
URN:	urn:nbn:de:hbz:38-175388
DOI:	10.1007/s00531-018-1589-7
Journal or Publication Title:	Int. J. Earth Sci.
Volume:	107
Number:	6
Page Range:	S. 2083 - 2100
Date:	2018
Publisher:	SPRINGER
Place of Publication:	NEW YORK
ISSN:	1437-3262
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language KESEBIR-KARDAMOS DOME; U-PB; LU-HF; STRUCTURAL EVOLUTION; METAMORPHIC COMPLEX; NORTHERN GREECE; SW BULGARIA; SM-ND; RAYLEIGH FRACTIONATION; ZIRCON GEOCHRONOLOGY Multiple languages Geosciences, Multidisciplinary Multiple languages
Refereed:	Yes
URI:	http://kups.ub.uni-koeln.de/id/eprint/17538