An examination of the variation in the concentration of Fe, Ti, and Mn within the different size fractions of till south of the Sanford Hill titanomagnetite deposit, Essex County, N.Y.
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Date
1988-12
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The Ohio State University
Abstract
The variation in the concentration of Fe, Ti, and Mn with distance for the -60+120 fraction of till south of the Sanford Hill Ore Body is similar to that demonstrated for the crystalline clasts south of the Canadian Shield. Near the deposit the concentrations decrease sharply with distance until reaching a transition distance where the concentrations stabalize. These trends are known as the "head" and "tail" of the anomaly respectively. The head of the Sanford Hill anomally is the region in which the concentrations of Ti, Fe, and Mn in the -60+120 Mesh fractions decrease exponentially with distance. Analyses of different size fractions show evidence for differential grinding of plagioclase and magnetite-ilmente. Therefore, bulk till samples should be used in order to average out the relative changes in the mineral composition of the grain size fractions with distance of glacial transport. Within the tail of the anomaly the transport mechanism of the ore material is englacial. These grains migrate from the interior of the ice to the zone of active grinding at the base of the glacier due to melting.