The micro-/macro-diamond relationship: A case study from the Artemisia kimberlite (Northern Slave Craton, Canada)

Diamond Formation: A Stable Isotope Perspective

“…This may be significant or may reflect sample bias introduced during sample selection. Recent evidence that sulfide-bearing diamonds display distinct carbon isotope distributions compared with silicate-bearing diamonds from the same mine and of the same paragenesis (Figure 4) (Thomassot et al 2009a; see also Deines et al 1987 for an earlier emphasis) and that microdiamonds and macrodiamonds from the same mine can display significant distributions (with mode and median differing by 0.7 and 1 respectively; Johnson et al 2012) leads us to consider these different δ 13 C modes as a second-order aspect.…”

Carbon and Nitrogen in Mantle-Derived Diamonds

“…The fine-scale C-and N-isotope variability of diamonds became truly open to study with use of ion microprobes (Fitzsimons et al 1999;Harte et al 1999;Bulanova et al 2002;Zedgenizov and Harte 2004;Craven et al 2009;Smart et al 2011;Peats et al 2012;Palot et al 2014Palot et al , 2017Howell et al 2015b;Petts et al 2015;Smit et al 2016Smit et al , 2019a, although not every study using MC-SIMS (multi-collector secondary ion mass spectrometer) actually focused on detailed Cand N-mapping (e.g., Johnson et al 2012;Krebs et al 2016;Howell et al 2020). It should be noted that the later (2009 onwards) studies in this list achieved a factor of 2 to 5 improvement in analytical precision of the isotopic analyses relative to the earlier studies, which permitted more subtle internal variations to be detected.…”

Relation between micro- and macro-diamonds: Myth, myopia or both?

“…The vast majority of kimberlites contain micro-diamonds but there are few studies relating these to macros, (drawn upon below from e.g. McCandless et al, 1994;Patterson & Levinson, 1995;Johnson et al, 2012;Melton et al, 2013).…”