NDLI: Eclogite relics in the Variscan orogenic belt of Bulgaria (SE Europe)

Content Provider	Springer Nature Link
Author	Gaggero, Laura Buzzi, Laura Haydoutov, Ivan Cortesog, Lucia
Copyright Year	2008
Abstract	Eclogitic rocks were sampled from two zones in the basement of the Sredna Gora terrane (central western Bulgaria): (1) partially retrogressed eclogites and amphibolites embedded in sillimanite-bearing garnet-micaschists with kyanite relics and migmatites and (2) banded amphibolites associated with muscovite-bearing metagranites within two-mica paragneisses. Rutile relics and oligoclase + green hornblende + epidote ± biotite pseudomorphs after garnet suggest an eclogite facies event. A tholeiitic, transitional affinity was determined for the protoliths, suggesting a continental rift environment, consistent with several eclogite-bearing complexes in the eastern segments of the Variscan belt that arose from the Cambro-Ordovician Gondwana break-up. Decreasing pressure after the eclogite overprint was demonstrated by (a) diopside-albite symplectite, and (b) plagioclase + red–brown to green amphibole kelyphite. The early static re-equilibration, dated to 398 ± 5.2 Ma by 40Ar–39Ar technique, was followed by an amphibolite facies foliation, which was pervasive in amphibolites, gneisses and micaschists, and poorly developed in eclogites. The lithospheric PT paths corresponding to higher and lower metamorphic gradients reflect the juxtaposition of crustal and lithospheric mantle units, respectively. In the build-up of the basement of the Balkan orogen, the physical properties of the lithological complexes might have influenced the collisional pattern of involved microplates.
Starting Page	1853
Ending Page	1877
Page Count	25
File Format	PDF
ISSN	14373254
Journal	International Journal of Earth Sciences
Volume Number	98
Issue Number	8
e-ISSN	14373262
Language	English
Publisher	Springer-Verlag
Publisher Date	2008-08-01
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	P–T–t path Migmatites Amphibole mineral chemistry 40Ar–39Ar geochronology Sredna Gora terrane Geology Geophysics/Geodesy
Content Type	Text
Resource Type	Article
Subject	Earth and Planetary Sciences

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