Cementacje węglanowe mułków limnoglacjalnych w okolicy Zakroczymia
Abstract
CARBONATE CEMENTATION OF LIMNOGLACIAL MUDS IN THE VICINITIES OF ZAKROCZYM
Summary
In the section of exposure at Duchowizna near Zakroczym (Fig. 1 - locality 2, Fig. 3 - layer 1), carbonate cementation has been found in limnoglacial muds assigned by M.D. Baraniecka (1, 2) to sediments formed in time of transgression of the Wkra stage.
Cemented forms are spherical or ellipsoidal in shape and they are varying from 2.8 to 12.7 cm in length, from 2.6 to 9.2 cm in width and from 1.8 to 5.0 cm in thickness (Table 1, Figs. 4, 5, 6, 7). Their distribution in mud layer is irregular. The forms form a horizon about 30 cm thick. They are built of, the same sediment as surrounding rock (mud), with preserved lamination and streaks (Fig. 10), and the differences are connected with share of calcium carbonate: about 13% in sediment and about 45% in "nodules".
The forms could originate in result of a change in pH when sediments became once more saturated with water. Irregular, flow lamination of the forms indicates down-slope transportation. Favourable conditions for developments of the processes are inferred in times of periglacial climate, when terrain surface was differentiated.
Summary
In the section of exposure at Duchowizna near Zakroczym (Fig. 1 - locality 2, Fig. 3 - layer 1), carbonate cementation has been found in limnoglacial muds assigned by M.D. Baraniecka (1, 2) to sediments formed in time of transgression of the Wkra stage.
Cemented forms are spherical or ellipsoidal in shape and they are varying from 2.8 to 12.7 cm in length, from 2.6 to 9.2 cm in width and from 1.8 to 5.0 cm in thickness (Table 1, Figs. 4, 5, 6, 7). Their distribution in mud layer is irregular. The forms form a horizon about 30 cm thick. They are built of, the same sediment as surrounding rock (mud), with preserved lamination and streaks (Fig. 10), and the differences are connected with share of calcium carbonate: about 13% in sediment and about 45% in "nodules".
The forms could originate in result of a change in pH when sediments became once more saturated with water. Irregular, flow lamination of the forms indicates down-slope transportation. Favourable conditions for developments of the processes are inferred in times of periglacial climate, when terrain surface was differentiated.