New age data of buried peat deposits from the site "Fili Park" (Moscow, Russia) by the uraniumthorium dating and palynological analysis and its stratygraphic significance

• Autorzy: Kuznetsov V. Yu. , Arslanov K. A. , Alekseev M. N. , Pisareva V. V. , Chernov S. B. , Maksimov F. E. , Baranova N. G.
• Języki publikacji: EN

Abstrakty

EN

The chronostratygraphically important Quaternary buried peats from the site "Fili Park" (located on the territory of Moscow) on the Russian Plain were studied by the methods of uranium-thorium dating (UTD) and palynological analysis. The deposits under study were the subject of intense debate: some number of the palynologists assigned ones to the Mikulino (Eem) Interglacial, while the another investigators - to the Odintzovo Interglacial (Middle Pleistocene). Detailed palynological study gave the possibility to mark out the 3 palynozones (M2, M3 and M4) in section vertical profile and refer the deposits to the Mikulino (Eem) Interglacial. The uranium-thorium dating (by "leachate alone" method) was carried out in the middle layers, which would be expected to be a closed system in respect to uranium and thorium isotopes. The direct uranium-thorium dating of inner layers showed the first UTD ages from 78.9 to 105.0 ka for deposits from the site "Fili Park". The corrected uranium-thorium age of buried peat turned out to be younger than the currently adopted boundaries of the last Interglacial (116-128 ka) and comprised 89š11 ka. There was probably an additional post-deposition uranium uptake in the internal section layers that in general have led to an underestimated age value. Nevertheless, we refered these questionable in chronostratigraphic respect deposits to the Mikulino Interlacial. The geochronological data obtained were compared with the uranium-thorium dating results (113š11 ka) for the closed geochemical samples from the Mikulino (Eem) Interglacial peats of the stratotypical section "Mikulino" (Russian Plain). This comparison confirmed the reliability of our conclusions.

Słowa kluczowe

EN

uranium/thorium dating; palynological analysis; geochronology; buried peat; Mikulino; Odintzovo; interglacials

• Wydawca: De Gruyter
• Czasopismo: Geochronometria
• Rocznik: 2002
• Tom: Vol. 21
• Strony: 41--48
• Opis fizyczny: Bibliogr. 23 poz., rys., tab.

Twórcy

autor

Kuznetsov V. Yu.

• Geographical Research Institute, Saint-Petersburg State University, Sredny Prospect 41, 199 004 Saint-Petersburg, Russia

autor

Arslanov K. A.

• Geographical Research Institute, Saint-Petersburg State University, Sredny Prospect 41, 199 004 Saint-Petersburg, Russia

autor

Alekseev M. N.

• Geological Institute of the Russian Academy of Sciences, Pyzhevsky Str. 7, Moscow, Russia

autor

Pisareva V. V.

• Geological Institute of the Russian Academy of Sciences, Pyzhevsky Str. 7, Moscow, Russia

autor

Chernov S. B.

• Geographical Research Institute, Saint-Petersburg State University, Sredny Prospect 41, 199 004 Saint-Petersburg, Russia

autor

Maksimov F. E.

• Geographical Research Institute, Saint-Petersburg State University, Sredny Prospect 41, 199 004 Saint-Petersburg, Russia

autor

Baranova N. G.

• Geographical Research Institute, Saint-Petersburg State University, Sredny Prospect 41, 199 004 Saint-Petersburg, Russia

Bibliografia

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