Thursday, December 12, 2013

Highlights—The world in a grain of sand…

Study of a suite of individual grains can provide incredible information on depositional systems and tectonic history. In this study, Vozárová et al. describe U-Pb (SHRIMP) detrital zircon ages from metasandstones of six stratigraphic levels of the low-grade early Paleozoic Northern Gemeric basement and its Carboniferous-Permian cover of the western Carpathians, Central Europe. The results reveal: a) a source from the Cadomian belt aged at between 550-700 Ma and from West African craton provenances, of ca. 1.8-2.7 Ga, b) recycling of Precambrian detrital zircon populations into the Carboniferous-Permian sedimentary basin fill, c) Variscan (355 Ma) peak metamorphic deformation and closure of the early Paleozoic basin, and d)  extensional processes and high exhumation and erosion rates of the Variscan collision belt. These dating results are interpreted to uniquely record the complex sedimentary, metamorphic, and tectonic evolution of this area.

Pb ages of detrital zircons in relation to geodynamic evolution: Paleozoic of the Northern Gemericum (Western Carpathians, Slovakia) by Anna Vozárová, Dušan Laurinc, Katarína Šarinová, Alexander Larionov, Sergey Presnyakov, Nickolay Rodionov, and Ilya Paderin

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