Laacher See Volcano @ EurekaMag.com
Mannheim, Germany (PRWEB) January 12, 2012
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The EurekaMag.com review of Volcan Laacher See is based on a recent report in a major U.K. daily paper describing the "super volcano" under the Laacher See lake in Germany as a sleeping giant that has recently begun to show worrying signs of awakening. While it has been 12,900 years since the last eruption, the volcano left a vast footprint on Europe. The EurekaMag.com review on Volcan Laacher covers a study which determined the age of the Laacher See to some 200 yr before the onset of the Younger Dryas cold episode. Carbonized trees and botanical macrofossils preserved by Laacher See Tephra provide detailed regional paleoenvironmental reconstruction and show that open woodland were typical for the cool and humid hemiboreal climatic conditions. In this resoect numerous animal tracks intercalated in Middle Laacher See deposits at the south of the Neuwied Basin are of special interest. Another study used different continental archives such as annually laminated lacustrine sediments, floodplain sediments, and speleothems to reconstruct environmental response to climatic changes and the Laacher See eruption event at circa 12,900 years ago. The authors paid special attention to establishing a reliable time control using varve counting, high-precision radiocarbon dating of tree-ring series, and AMS radiocarbon dating of terrestrial plant macrofossils recovered from lacustrine sediments to correlate and synchronize large-scale environmental changes and events in central Europe. They conclude that the carbonatites of Laacher See and Alnoe were not formed by limestone assimilation but probably derived from gabbroic or ultramafic rocks at depth. Another paper presents evidence that the large, but so far largely ignored eruption of the Laacher See-volcano dated to 12,920 BP, had a dramatic impact on forager demography all along the northern periphery of Late Glacial settlement and precipitated archaeologically visible cultural change.
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