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Geochronology of vegetation stages of south-east Baltic coast (Kaliningrad region) during the middle and Late Holocene

Arslanov K., Druzhinina O., Savelieva L., Subetto D., Skhodnov I., Dolukhanov P., Kuzmin G., Chernov S., Maksimov F., Kovalenkov S.

Geochronometria

2011

Vol. 38, no. 2

172-181

The raised bog sediments that have been continuously accumulated over time represent the most suitable natural object which enables us to reconstruct Late Glacial and Holocene vegetation and palaeoclimates. Bog peat consists of organic carbon formed in situ. It contains moss, plant fragments and microfossils that are necessary for the study of palaeovegetation and palaeoclimate. However, a successful study of palaeoenvironment can be carried out on the basis of investigation of a great quan-tity of samples along the whole peatbog thickness. In the present paper, the authors present the results of palynological, botanical investigations and radiocarbon dating of 31 peat samples taken from the raised bog Velikoye, located in the eastern part of Kaliningrad Region. The data obtained have ena-bled us to reconstruct the palaeovegetation, reveal the evolution of the bog and determine rate of peat formation at different evolutional stages over the last 7500 cal BP.

230TH/U dating of massive sulfides from the logatchev and rainbow hydrothermal fields (Mid-Atlantic Ridge)

Kuznetsov V., Cherkashev G., Lein A., Shilov V., Maksimov F., Arslanov K., Stepanova T., Baranova N., Chernov S., Tarasenko D.

Geochronometria

2006

Vol. 25

51-55

A radiochemical study was carried out on massive sulfides from three hydrothermal fields in the Mid-Atlantic Ridge. The main objective was to check whether 230Th/U dating yields reliable results. The absolute 230Th/U ages of massive sulfide samples of three hydrothermal fields at the Mid Atlantic Ridge were determined 58.2±4.2 ka and 16.8±1.0 ka for the "Logatchev-1" site, 3.9±0.4 ka for the "Logatchev-2" site and 23.0±1.5 ka, 3.9±0.6 ka and 2.2±0.3 ka for the "Rainbow" site. The dates correspond to the activation periods of hydrothermal ore formation systems.