CGRG Bibliography of Canadian Geomorphology
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Author : Bajc, A.F.; and Crabtree, D.C.
Date : 2001.
Title : Results of regional till sampling for kimberlite and base metal indicator minerals, Shebandowan greenstone belt, northwestern Ontario.
Publication : Ontario Geological Survey. Open File Report
Issue :
Page(s) : 67 p.
Abstract
A project of Quaternary geological mapping and regional till sampling was undertaken over the Shebandowan greenstone belt during the 1998 and 1999 field seasons. The results of gold grain and geochemical analyses were published previously in Ontario Geological Survey Open File Reports 5993 and 6012. This report contains the results of indicator mineral processing for base metals and diamonds. Quaternary mapping helped to characterize the surficial materials present within the study area and to reconstruct the ice flow history associated with these deposits. This information provided a framework by which the regional materials compositional datasets could be interpreted. The regional sampling program provided information on the background concentrations of various indicator minerals present in till. Few kimberlite indicator minerals were recovered as part of the regional till sampling program over the Shebandowan greenstone belt. The apparent random distribution of grains coupled with the lack of supporting mineral species at any given site suggests that the grains form part of a regional background population likely derived from distant sources to the northeast. The dataset suggests that this region has reduced potential for the discovery of kimberlite-hosted diamonds. Stream and esker sampling programs are recommended to more fully evaluate the region. The MMSIM (super R) dataset clearly delineates a number of base metal exploration targets. These are defined, in many instances, by multiple indicator mineral species and supported by till geochemistry. Higher density till sampling and prospecting is recommended within these anomalous areas to determine their significance and possibly refine exploration targets.
Bibliography of Canadian Geomorphology