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The AAPG/Datapages Combined Publications Database
Journal of Sedimentary Research (SEPM)
Abstract
A Special Mechanism for Varve Formation in a Glacial Lake
C. I. Dell
ABSTRACT
One of the major stratigraphic units in Lake Superior is a sequence of gray varved clays formed in late-glacial time. The sediment was carried into the lake by meltwater streams flowing from the region of gray calcareous tills in the northern part of the basin. During the summer when the sedimentation rate was high, the carbonates were rapidly buried and a highly calcareous layer preserved. During the winter the sedimentation rate was greatly reduced, the carbonates were partially dissolved by the cold lake water and a low-carbonate winter layer formed.
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