Diatom-based evidence for abrupt climate changes during the Late Glacial in the Southern Carpathian Mountains

Buczkó, Krisztina and Magyari, Enikő K. and Soróczki-Pintér, Éva and Hubay, Katalin and Braun, Mihály and Bálint, Miklós (2009) Diatom-based evidence for abrupt climate changes during the Late Glacial in the Southern Carpathian Mountains. Central European Geology, 52 (3-4). pp. 249-268. ISSN 1788-2281

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Abstract

Abstract A high-resolution paleolimnological record from Lake Brazi (TDB-1; 45°23’47″N, 22°54’06″E, 1740 m a.s.l.), a small, glacial lake in the Retezat (South Carpathian Mountains, Romania) provides a sensitive record of the impacts of late glacial climatic change on siliceous algal assemblages. The sequence, ranging from 15,700 cal yr BP to 9500 cal yr BP, suggests that the most significant changes in diatom assemblages took place at 12,800 and 10,400 cal yr BP, when alkaliphilous fragilarioid taxa were replaced by acidophilous diatoms. Altogether eight zones were distinguished with sharp and rapid changes of diatom assemblages. The paper discusses the application of siliceous algae in multi-proxy paleolimnological analyses, demonstrates the advantages and disadvantages of this proxy and presents the story of floristic discovery of unique diatom assemblages, the closest recent analogs of which are found in the arctic region.

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