天然钻石中首现富镍合金

Core Insights - The discovery of naturally occurring nickel-rich alloys in diamonds from the Voorspoed mine in South Africa provides direct validation of long-suspected mantle redox models [1][2] - The research team identified iron-nickel alloy nanoparticles and nickel-rich carbonate microcrystals, revealing a redox freezing reaction that indicates a transition from reducing to more oxidizing conditions in the mantle [1][2] Group 1 - The international team, including researchers from Hebrew University of Israel, University of Nevada, and University of Cambridge, made the first discovery of nickel-rich alloys in natural samples [1] - The diamonds formed at depths of 280 to 470 kilometers, supporting theoretical predictions about the stability of nickel-rich alloys in the mantle [1] - The presence of iron-nickel alloys and nickel-rich carbonates suggests a geochemical snapshot of mantle reactions, where diamonds encapsulate a brief moment of these processes [1][2] Group 2 - This finding may explain why some ultra-deep diamonds exhibit unusually high oxidation states and could provide material sources for volatile-rich magmas such as kimberlites and lamproites [2]