Apatite fission-track ages from the Archean Karelian Craton: First results

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Abstract

The first apatite fission-track ages (AFTA) from surface samples of geological objects within the Archean Karelian craton – the Kivakka massif (AFTA 901±95 Ma (±2σ)), the Pirttiguba dyke (957±87 and 1024.3±90.9 Ma) and the Ropruchey sill (990±101 Ma) have been obtained. Obtained results indicate the absence of regional thermal events above 120°C within the Karelian craton over the past billion years. This suggestion is in agreement with low-temperature thermochronology data from conjugate sites in Finland. Time-temperature models of the studied magmatic bodies indicate a monotonic cooling of the rocks of the present-day surface of the Karelian craton throughout the Phanerozoic at a rate of 0.12–0.31°C/Myr. This corresponds to a denudation rate of 6–16 m/Myr (assuming a geothermal gradient value of 20°C/km).

About the authors

T. E. Bagdasaryan

Schmidt Institute of Physics of the Earth, Russian Academy of Sciences

Email: tanya.bagdasaryan@yandex.ru
Moscow, Russia

R. V. Veselovskiy

Schmidt Institute of Physics of the Earth, Russian Academy of Sciences; Lomonosov Moscow State University, Geological faculty

Moscow, Russia; Moscow, Russia

A. V. Stepanova

Institute of Geology, Karelian Research Centre, Russian Academy of Sciences

Petrozavodsk, Russia

A. Yu. Bychkov

Lomonosov Moscow State University, Geological faculty

Moscow, Russia

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