Diamond Formation and Decarbonation under Lithospheric Mantle Pressures and Temperatures
A special issue of Minerals (ISSN 2075-163X). This special issue belongs to the section "Crystallography and Physical Chemistry of Minerals & Nanominerals".
Deadline for manuscript submissions: closed (10 February 2023) | Viewed by 4097
Special Issue Editor
Special Issue Information
Dear Colleagues,
Studies on the stability of natural carbonates and the features of CO2 fluid generation during mantle-crust interaction are critical for the reconstruction of the processes of the global carbon cycle, including mantle metasomatism, natural diamond formation, as well as formation evolution of carbonated eclogites and peridotites. The key factors that determine the stability of carbonates in the mantle are pressure, temperature, oxygen fugacity, and environmental composition. Their variations can lead to phase transitions and changes in the structure of carbonates, initiate processes of partial melting, decomposition or various reactions involving carbonates. The latter include diamond-forming redox reactions between carbonates and reduced phases (metallic iron, carbides, sulfides, reduced fluids and melts) and decarbonation reactions that occur when carbonates interact with silicates and/or oxides and lead to the formation of CO2 fluid and the crystallization of newly formed silicates. Decarbonation is one of the most common fluid-generating processes occurring during the interaction of the subducting slab with mantle rocks. Numerous occurrences of carbonates and CO2-fluid as inclusions in diamonds, and existing ideas of genetic relations of natural diamond with carbonates and carbon dioxide, makes very relevant to study the decarbonation reactions and related diamond formation.
Dr. Yuliya V. Bataleva
Guest Editor
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Keywords
- decarbonation
- natural diamond formation
- CO2 fluid
- fluid generation
- mantle metasomatism
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