Zartman, R E; Kempton, Pamela D; Paces, J.B.; Downes, Hilary; Williams, Ian; Dobosi, Gabor; Futa, Kiyoto
Jurassic kimberlites in the southern Superior Province in northern Michigan contain a variety of possible lower-crustal xenoliths, including mafic garnet granulites, rare garnet-free granulites, amphibolites and eclogites. Whole-rock major-element data for the granulites suggest affinities with tholeiitic basalts. P-T estimates for granulites indicate peak temperatures of 690-730°C and pressures of 9-12 kbar, consistent with seismic estimates of crustal thickness in the region. The granulites...[Show more]
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