The largest diamonds are hosted in iron-rich substrate accreted at the base of the lithosphere

Diamond formation; Kimberlite magma interaction with deep lithospheric substrates

This preprint investigates the origin of CLIPPIR diamonds, large and rare diamonds exhibiting unique characteristics. The authors explore the association between these diamonds and the composition of their host kimberlites, particularly focusing on olivine. Their findings demonstrate a relationship between CLIPPIR diamonds and kimberlites that have sampled Fe-rich, isotopically anomalous domains in the deep lithosphere. While they present a model involving subduction and accretion of these domains, the work primarily focuses on characterizing the association and refining the understanding of the processes within the existing paradigm of diamond formation. It does not propose a radical departure from current models but adds significant detail and constraints. This aligns with the characteristics of normal science as defined by Kuhn, where research aims to solidify and extend the dominant paradigm rather than challenge it. While the described processes touch upon concepts related to model drift, the presented study remains well within the normal science classification. The study builds upon established knowledge of diamond formation and kimberlite petrogenesis, further developing this existing framework.