Analiza palinologiczna i diatomologiczna osadów interglacjału mazowieckiego w Adamówce (Kotlina Sandomierska)

Abstract

Badania palinologiczne i diatomologiczne osadów organogenicznych w Adamówce wykazały, że powstały one w interglacjale mazowieckim. Analizie poddano dwa profile jeziorne: Adamówka I, obejmujący pełną sukcesję interglacjalną (fazy pyłkowe I - IV. diatomofazy A1-A3), oraz Adamówka II, reprezentujący schyłkowy okres interglacjału (fazy pyłkowe III - IV).PALYNOLOGIC AND DIATOMOLOGIC ANALYSIS OF THE MASOVIAN INTERGLACIAL DEPOSITS IN ADAMOWKA (SANDOMIERZ LOWLAND) The organic deposit complex Adamówka I, occurring at the depth of 13.5-23.0 m, consist of the complete plant succesion from cold tundra-type flora with supremacy of birch and presence of Selaginella in the lowest samples of the profile (51 and 52), through the period of prevailing mixed forests with spruce and with comparatively high admixture of stenothermal plants, then the period of climatic optimum with contribution of stenothermal deciduous trees and hanzel-hornbeam- and fir-trees to the next cool phase. The above succession may be related to phases I  -IVa (B. Jaron, 1933). Deposits of borehole Adamówka II (depth 13.5-17.0 m) consist of the late interglacial succession (phases III-V) partly with the climatic optimum and predominance of hornbeam (phase III), the cool-ing (subphase IVb) marked by pine-spruce communities with juniper and repeated warming marked by a slight increase in percentage of stenothermal vegetation (subphase IVc). Top spectra show the tundra-type character of the communities. The analysis of diatoms was used to organogenic deposits of Adamówka I profile where three phases of the diatom development were distinguished: diatom phases A1-A3 (Fig. 3). The diatom phases entirely correspond with the palynologic division of the Adamówka I profile (Fig. 1). In the lower part the investigated proftle (diatom phases A1, A2) there is a predominance of diatoms of the genus Cyclotella (Table I-III). Tbey are characteristic for oligo-mesotrophic lake plankton of the Masovian and Likhvin Interglacial time (L.P. LOginowa, 1979; B. Marciniak. 1980). At Adamówka the Stephanodiscus flora is not so abundant and valves hard to identify were noted (Table IV). In the upper part of the profile (diatom phase A3) a participation of genus Fragilaria increases: littoral alkaliphilous diatoms are widely distributed (cosmopolitan) in waters of all the types. Basing on the floral succession and contribution of exotic elements the age of the analyzed organic series has been determined for the Masovian Interglacial.