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Instruments / Technical Area	Publication Details	Published	Actions
B22-Multimode InfraRed imaging And Microspectroscopy	Diamond - garnet elastic geobarometry applied to an eclogitic system Marta Morana , Lorenzo Barni , Haixing Fang , Giulia Marras , Gianfelice Cinque , Antonio Angellotti , Fabrizio Nestola , Alla Logvinova , Denis Mikhailenko , Luca Bindi , Vincenzo Stagno Lithos 514-515 DOI: 10.1016/j.lithos.2025.108205 Diamond Proposal Number(s): [35052] Open Access Show Abstract ▼ Abstract: The investigation of mineral inclusions in diamonds represents a unique tool to better understand the mineralogy and composition of hidden portions of Earth's mantle and, hence, determine conditions of pressure and temperature at the time of diamond formation. Using a combination of experimental techniques and different geothermobarometric approaches, we characterized a natural diamond from Udachnaya kimberlite pipe entrapping nine inclusions; the inclusions are five garnets, three clinopyroxene and one sulfide and represent an eclogitic paragenesis. Here, we adopted, for the first time, the elastic geobarometry method to the garnet-diamond inclusion-host system to calculate the entrapment conditions for the diamond-garnet pair, resulting in 5.7(±0.3) GPa at 1154 °C. These P-T data are compared with estimates obtained through chemical geothermobarometry, employing T projection onto the local geotherm, a common approach used for eclogite xenoliths in absence of robust calibrated barometers. Our data demonstrate that elastic geobarometry for the garnet-diamond pair results to be a very reliable tool to determine the diamond formation also for eclogitic systems and this will allow to expand our knowledge on eclogitic diamonds in terms of depth of formation.	Nov 2025
B22-Multimode InfraRed imaging And Microspectroscopy	Spatial distribution of nitrogen and hydrogen in natural lithospheric diamonds by in situ synchrotron infrared microspectroscopy A. Angellotti , M. Morana , L. Barni , G. Cinque , Y. Lu , R. Tao , G. Marras , A. Logvinova , L. Bindi , D. Mikhailenko , V. Stagno Diamond And Related Materials DOI: 10.1016/j.diamond.2025.113060 Diamond Proposal Number(s): [35052] Open Access Show Abstract ▼ Abstract: Natural diamonds are exceptional carriers of mineralogical and chemical information from inaccessible depths of our planet. During their crystallization, they can host light elements such as H and N preserving a natural archive of mantle chemistry that, in turn, allows a better understanding of the chemical composition of the growth media, mechanisms of their formation and residence temperatures in the interior of Earth. However, how N and H distribute near entrapped minerals is still unknown. In this study we investigated the effect of chromite mineral inclusions on the spatial distribution of nitrogen and hydrogen in two natural diamonds of peridotitic origin using in situ synchrotron-based Fourier transform infrared microspectroscopy. From the acquisition and optimization of high-resolution maps, we determined the distribution of nitrogen, hydrogen, and nitrogen aggregation state. Our results reveal a dependence between the absorption of H-related peaks with the incorporation of pairs of nitrogen atoms (NA-centers). We explain it as indication that chemical interactions between chromite and H might be masked by variations in the N aggregation state. We also conclude that synchrotron micro-FTIR is an advanced technique to assist the synthesis of N- (and H-) doped diamonds for industrial applications.	Nov 2025

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