Holly Marie Johnson HBSc thesis abstract

Thesis Title: 
Carbonate Geochemistry of Pleistocene Varves: Northern Lake Superior
Holly Marie

The carbonate fraction of recent of recent sediments from the northern Lake Superior basin was analysed as to mineralogy and trace element distributions.

Three carbonate phases; low-magnesium calcite, protodolomite and dolomite are present.  Detrital minerals include quartz, alkali and plagioclase feldspars, illite, vermiculite and chlorite.

The trace elements analysed are strontium, manganese and barium.  The distribution of these elements appears to be controlled by the carbonate mineralogy.  The strontium is concentrated in the calcite while the barium is found preferentially in the dolomite.