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The James Bay area on the Superior Craton hosts both Mesoproterozoic kimberlites (~1.1 Ga; Kyle Lake) and Jurassic kimberlites (~180-170 Ma; Attawapiskat, including Victor; Januszczak et al. 2013) in close proximity (separated by ~100 km). A major thermal event related to the development of the Midcontinent Rift at ca. 1.1 Ga induced an elevated regional geothermal gradient that led to partial diamond destruction (Smit et al. 2014a,b). The Victor kimberlite is characterised by an inclusion suite that, contrary to the the current paradigm, formed in a moderately depleted lherzolitic mantle and produces diamonds of exceptional value (Stachel et al., this volume). This raises the question of when, and how, the diamond inventory at this locality was formed. Based on a comparison of N aggregation and carbon isotope systematics of diamonds from the two kimberlite age groups, it was hypothesised that the Victor kimberlite sampled a young generation of diamonds which formed after dissipation of the heat associated with the Midcontinent Rift (Smit et al. 2014a). Given that the lherzolite-dominated Victor suite represents an unconventional diamond deposit (Stachel et al., this volume), age dating is required to confirm the timing of this inferred young diamond-formation event. This not only allows us to establish a link to regional tectonothermal evolution, but also to explore broader implications for models of diamond formation and the associated carbon redistribution in the lithospheric mantle as part of the deep carbon cycle.

Re-Os isotope systematics of sulphide inclusions in diamonds from Victor (Superior craton) document mobilisation of volatiles and Os during Rodinia break-up