Dating glacier layers consolidating student loans bankruptcy
In central Alaska, for example, the melting season is typically 3-5 months long while the non-melt season makes up the remainder of the year.
The melting season in a glacial lake is a time of heavy melting of snow on the glacier and the land surface surrounding the lake.
Varves are defined as annual sediment layers and they can occur in many different environments.
According to De Geer (1940) the term “varve” in English is derived from the Swedish term “varv”, (“hvarf” in its older spelling), for the cyclic clay deposits underlying the land surface of eastern Sweden.
A common glacial varve phenomenon is a distinct graded bed of sand and silt that can mark the beginning of the melting season layer (arrows) and is sometimes capped by a thin silty clay bed.In addition, the melting of glacial ice in the glacier’s ablation zone also contributes large volumes of water.Input of dense meltwater with high sediment concentration triggers circulation and bottom current activity in the lake and results in the deposition of silty to sandy layers.This allows fine sediment particles (clay-size) to be deposited in the lake for an extended period of time without silt and sand deposition. Winter beds tend to not vary much in thickness from year to year, and not nearly as much as summer layers.Glacial varves have a variety of features in them and vary tremendously in terms of internal grain size and bedding.