Ice-rafted sediments from the Fram strait: new data on mineralogy, geochemistry and spore-pollen spectra
E.V. Belogub, A.V. Maslennikova, V.P. Shevchenko, A.V. Maslov, S. Gerland, I.A. Blinov
The results of study of composition of ice-rafted sediments (IRS) from drifting ice of the Fram Strait are presented. The coarse fraction includes aggregates of clayey minerals, quartz, feldspars, mica and chlorites, rarely epidote, amphibole and monazite. The presence of grains with variable degree of roundness allows us to assume heterogeneous siliciclastic sources. Mica and chlorites are dominant in the clayey fraction. Smectite and kaolinite amount is relatively low. This indicates that present-day bottom sediments of the shallow shelf of the eastern part of the Laptev Sea and East Siberian Sea are potential IRS sources, which is also supported by the distribution of Co, Cr and REEs. The spore-pollen spectra also indicate heterogeneous IRS source. The presence of pollens of trees atypical of subpolar areas is evident of a distal wind or water transportation of the material. Our data suggest that the IRS from the drifting ice of the Fram Strait include sedimentary matter captured by the ice during roil of the bottom sediments of the eastern part of the Laptev Sea, the East Siberian or Chukchi (?) seas, as well as the products of long-range atmospheric and water transport.
Figures 12. Tables 3. Referenses 29.
Key words: ice-rafted sediments, Fram Strait, mineralogy, geochemistry, spores and pollens.
МINERALOGY № 4 2017