The sediments of Lammaslampi, a small lake situated about 32 m a.s.l. in Vantaa, were studied by means of pollen and diatom analyses and loss-on-ignition measurements. In addition x-ray diffraction analysis was used to examine the mineral composition of the basal part of the profile, and five radiocarbon determinations to date the local shoreline displacement. The basin was continuously connected to the Baltic until it became isolated as the result of the isostatic uplift after the Litorina transgression 6 550 ± 170 C 14 years BP. The »early Mastogloia phase» in the region was dated to c. 7 700 BP and the beginning of the Litorina stage to c. 7 300 BP.
Rapakivi granite samples were incubated with Pseudomonas aeruginosa culture solutions in order to elucidate the possible role of bacteria in rapakivi (crumbling stone) disintegration. SEM micrographs showed micromorphological alterations on the incubated rapakivi surface at 21 to 23°C for 20 days. Elevated concentrations of Na, Ca, K, Fe, and Mg were detected in the culture solutions after incubation. Elemental oxide ratios [K 2 O : (Na 2 O + CaO)] in culture solutions were similar to those in rapakivi ovoids, suggesting a proportional dissolution pattern of these elements.
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