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Lower-crustal Xenoliths from Jurassic kimberlite diatremes, Upper Michigan (USA): Evidence for proterozoic orogenesis and plume magmatism in the lower crust of the southern superior province

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]

CollectionsANU Research Publications
Date published: 2013
Type: Journal article
Source: Journal of Petrology
DOI: 10.1093/petrology/egs079


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