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Peregrine Diamonds has previously reported on the evolution and refinement of efforts to trace kimberlitic indicators recovered from till sampling campaigns to their kimberlite source(s) at the Chidliak project on Baffin Island, Canada (see Neilson et al., 2012; Pell et al., 2013). Our earlier work capitalized on the comparative abundance of fresh peridotitic ± eclogitic garnets in till samples, and leveraged Mn-thermometry applied to Cr-pyrope compositions (after Grütter and Tuer, 2009) to reveal distinct Temperature-TiO2 profiles (TTiPs) that match equally distinct TTiPs in up-ice kimberlite sources (see Fig. 1 for TTiP explanation and Fig. 2 for an example from northern Chidliak). Simple visual comparison of TTiPs has served to conclusively “fingerprint” and resolve several sources, but we have encountered ambiguous TTiP-source interpretations in settings where:  Similar TTiPs occur in closely spaced known sources (e.g. Fig. 7 of Neilson et al., 2012);  One or more known source(s) contain log-orders more indicators per kilogram of kimberlite, and consequently “swamp” the TTiP signal from nearby source(s) that have low indicator counts;  A high sample density reveals many till samples with a near-uniform “bulk-average” TTiP, resulting in ambiguous interpretations of potentially unique sources (e.g. Fig. 5 of Neilson et al., 2012). This “problem” is particularly conducive to analysis by Mahalanobis-distance techniques due to an anchoring effect provided by the common “bulk-average” (or mean) TTiP.

Tracing kimberlitic indicators to their kimberlite source at Chidliak, Nunavut, Canada, re-visited: the unexpected accuracy of a simplified Mahalanobis-distance approach