Metagranitoids from the eastern part of the Central Rhodopean Dome (Bulgaria): U–Pb, Rb–Sr and 40Ar/39Ar timing of emplacement and exhumation ... View Full Text


Ontology type: schema:ScholarlyArticle     


Article Info

DATE

2004-09

AUTHORS

I. Peytcheva, A. von Quadt, M. Ovtcharova, R. Handler, F. Neubauer, E. Salnikova, Y. Kostitsyn, S. Sarov, K. Kolcheva

ABSTRACT

Geochronological data (U–Pb, Rb–Sr and 40Ar/39Ar) are used to unravel the Late Alpine high-grade metamorphism, migmatisation and exhumation of Variscan granitoids within the core of the Central Rhodopean dome, Bulgaria. The age of the granitoid protolith is 300 ± 11 Ma, as determined by U–Pb analyses on single zircons selected from the core of the dome structure. Rb–Sr whole rock data define an errorchron with a large scatter of the data points due to the Late Alpine metamorphic overprint. The slope of the reference line indicates a Variscan magmatic event. Strontium characteristics are used to discriminate the samples most influenced by metamorphism from those, which reflect possible differences in the protolith age of the granitoids. Petrological-geochemical data, the initial strontium ratio of 0.708 ± 0.001, and ɛHf zircon values ranging from −2.58 to −3.82 point to a mixed, but crust-dominated origin of the Variscan magmas; young crustal material and mantle fragments were sources for the I-type metagranitoids. The exhumation of the granitoids from depths greater than 20–25 km to about 5 km below the surface was a rapid geological process. It started with the formation of granitic eutectic minimum melts at the temperature peak of metamorphism. Monazite crystallisation at about 650 °C continued during isothermal decompression to possible depths of about 10–12 km. An age of 35.83 ± 0.40 Ma was determined using conventional U–Pb isotope methods on four multigrain monazite fractions. A maximum average age of 36.6–37.5 Ma (assuming same error uncertainties) for crystallisation of the metamorphic monazites was calculated assuming 10 to 20% monazite resetting during the subsequent Oligocene volcanism and hydrothermal activity in the region of the Central Rhodopean Dome. The rocks were then cooled to about 350–300 °C at 35.35 ± 0.22 Ma according to 40Ar/39Ar ages of biotites and below 300 °C at 35.31 ± 0.25 Ma (Rb–Sr data), as indicated by crystallisation of adularia in an open vein subsequent to pegmatite intrusion. A minimum exhumation rate of 3–5 km per 1 million years can therefore be calculated for the exhumation of the metagranitoids during the period from 38–35 Ma. More... »

PAGES

1-31

Identifiers

URI

http://scigraph.springernature.com/pub.10.1007/s00710-004-0039-3

DOI

http://dx.doi.org/10.1007/s00710-004-0039-3

DIMENSIONS

https://app.dimensions.ai/details/publication/pub.1009288368


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