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The Paleoproterozoic Baraboo paleosol is the most chemically mature Precambrian paleosol in the Lake Superior region, having formed under the influence of a warm, humid climate in a region of subdued topography. We have determined the chemical variability among six samples of granitic protolith and found that such variability is inherited in the weathering profile. To minimize the effect of sample...
A 2100Ma, 420cm-thick metasaprolite, which is devoid of plagioclase but contains abundant microcline, occurs in the Archean McGrath Gneiss beneath the overlying Paleoproterozoic Denham Formation. Despite being recrystallized under amphibolite-facies conditions and chemically modified by potassium metasomatism, mass fluxes related to weathering and metasomatism of the McGrath metasaprolite can be estimated...
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