Wyniki wyszukiwania - BazTech

Ograniczanie wyników

2 2005

Powiadomienia systemowe

Sesja wygasła!

Znaleziono wyników: 2

Liczba wyników na stronie

Wyniki wyszukiwania

Sortuj według:

Ogranicz wyniki do:

Ecosystem response to early and late Holocene lake-level changes in lake Jjuusa, Southern Estonia

Koff T., Punning J.-M., Sarmaja-Korjonen K., Martma T.

Polish Journal of Ecology

2005

Vol. 53, nr 4

553-570

The main aim of the study is to analyse the response of the catchment and lake ecosystem to the lake-level change on the basis of pollen, macrofossil, cladoceran and stable isotope records obtained by a comprehensive study of sediments from a shore core from Lake Juusa (Southern Estonia). The obtained multi-proxy data indicate that there is good correspondence between lithological, macrofossil and cladoceran changes during most time in the studied period. The palaeorecords show that the development of the Lake Juusa ecosystem was triggered mainly by the fluctuations of the lake level. Discrepancies of the data for some periods are caused by the concurrent processes having specific impact on the obtained records.

The Wenlock-Ludlow carbon isotope trend in the Vidukle core, Lithuania, and its relations with oceanic events

Martma T., Brazauskas A., Kaljo D., Kaminskas D., Musteikis P.

Geological Quarterly

2005

Vol. 49, No. 2

223--234

A Wenlock to Ludlow terrigenous-carbonate succession in the Vidukle core in Central Lithuania represents a deep shelf environment with a general upwards-shallowing trend, interrupted by brief deepening episodes. The carbon isotope trend, based on 115 whole-rock analyses, shows three main excursions: (1) a major excursion (δ13 C values reach 3.2‰) in the lower Wenlock, (2) low shifts (1.3‰ and 1.6‰) at two levels in the upper most Wenlock Siesartis Formation corresponding to the Monograptus ludensis Biozone, (3) the most prominent excursion (δ13 C values reach 8.2‰) occurs in the upper Ludlow Mituva Fm. The upper Ludlow excursion is dated by the last occurrences of Polygnathoides siluricus below the main shift and the appearance of Ozarkodina wimani and O. crispa above the excursion. The excursion stratigraphically coincides with the Lau oceanic Event and is correlated with the mid-Ludfordian Neocucullograptus kozlowskii-Bohemograptus bohemicus tenuis Biozone. Changes in the carbon isotope trend are in general harmony with some aspects of the rock (CaO, terrigenous component) and fossil content of the section. The data presented are consistent with an arid climate model for the Ludfordian isotope event.