Pierre Cartigny

TL;DR: For example, Harte et al. as mentioned in this paper found that diamond is a rare mineral, occurring at the part-per-billion level even within the most diamondiferous volcanic host rock although some rare eclogites have been known to contain 10−15% diamond.

TL;DR: Most diamonds form in a relatively narrow depth interval of Earth's subcontinental mantle between 150 and 250 km from carbon isotope analyses of diamond obtained in the 1970s, it was first proposed that eclogitic diamonds form from crustal carbon recycled into the mantle by subduction and that the more abundant peridotitic diamonds formed from mantle carbon as mentioned in this paper.

TL;DR: Populations of sulfide inclusions in diamonds from the Orapa kimberlite pipe in the Kaapvaal-Zimbabwe craton, Botswana, preserve mass-independent sulfur isotope fractionations, indicating that material was transferred from the atmosphere to the mantle in the Archean.

TL;DR: In this article, Nitrogen and hydrogen isotopic compositions together with N, K, Rb, Cs and H 2 O contents were measured on several high pressure (HP) to ultrahigh pressure (UHP) metasediments from the Schistes Lustres nappe (western Alps) and on unmetamorphosed sedimentary protoliths from the Apennines (Italy).

TL;DR: In this article, a compilation of more than 1200 δ13C-N data from well-characterised diamonds show a correlation of the maximum diamond nitrogen content (i.e., a limit sector) with δ 13C over the full diamond δ-13C range.