New U-Pb titanite age data on the rocks from the Karelian craton and the Belomorian mobile belt, Fennoscandian Shield |
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Authors: | N S Nesterova T I Kirnozova and M M Fugzan |
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Abstract: | We test the possibility of applying titanite as indicator of the boundaries between the Belomorian mobile belt and the Karelian
craton of the Fennoscandian Shield. U-Pb isotope dating established wide variations of titanite ages in the Belomorian mobile
belt and the Karelian craton. The titanites from the Karelian craton are mainly Archean in age (2.52–2.86 Ga), whereas the
Belomorian mobile belt contains, with few exceptions, Paleoproterozoic titanites (1.74–1.95 Ga). In the Karelian craton, the
age of titanite, in general, records the cratonization of the Earth’s crust (2.8 Ga and 2.6–2.7 Ga, respectively). In the
Belomorian mobile belt, it presumably reflects the timing of the exhumation of tectonic nappes from the mid-crustal depths
during the collisional stage of the evolution of the Lapland-Kola orogen. |
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