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  • 1
    Keywords: Geochemistry. ; Mineralogy. ; Nanochemistry. ; Biogeography. ; Geochemistry. ; Mineralogy. ; Nanochemistry. ; Biogeosciences.
    Description / Table of Contents: Chapter 1. Introduction -- Chapter 2. Diamond thermodynamic stability: The paradox of the crystal size -- Chapter 3. Experimental data on nanocarbon formation at low P-T conditions -- Chapter 4. Diamond formation in the Oceanic Lithosphere -- Chapter 5. Nanocarbon and microdiamond formation in the lithogenesis and metamorphic processes -- Chapter 6. Diamonds in kimberlites and their xenoliths: A reappraisal -- Chapter 7. Conclusions.
    Abstract: In this book, readers will gain a deep understanding of the distinct characteristics and intricate formation mechanisms behind each type of diamond. A standout feature of this book is its in-depth exploration of nanodiamonds, shedding light on their unique formation processes. The narrative is thoughtfully organized, covering four main categories of natural diamonds and their related formation processes: 1)Interstellar nanodiamond particles; 2) Nano- and microcrustal diamonds associated with coals, sediments, and metamorphic rocks; 3) Nanodiamonds and microdiamonds associated with secondary alterations of mafic and ultramafic rocks mainly in the oceanic lithosphere; 4) Mantle-derived diamonds associated with kimberlites and their xenoliths, such as peridotites and eclogites. With clarity and precision, this book caters to both researchers and students in the fields of mineralogy and mineral formation. This book serves as an invaluable resource, offering an all-encompassing perspective on diamond formation, appealing to those curious minds eager to delve into the captivating realm of these precious gems.
    Type of Medium: Online Resource
    Pages: VIII, 132 p. 53 illus., 14 illus. in color. , online resource.
    Edition: 1st ed. 2023.
    ISBN: 9783031432781
    Series Statement: SpringerBriefs in Earth Sciences,
    DDC: 551.9
    Language: English
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  • 2
    Publication Date: 2011-06-01
    Description: The diamond content of metamorphic rocks of the Kumdy-Kol and Barchi-Kol deposits in the Kokchetav Massif, northern Kazakhstan, varies widely from less than one carat to several hundred carats per tonne (cpt). Diamond mineralization is neither controlled by a special rock type(s), nor is its spatial distribution random, as could be expected from the UHP nature of the parent process. Diamond mineralization occurs in linear zones coinciding with tectonic discontinuities and associated metasomatic rocks. The morphology of diamondiferous zones follows branching linear patterns of metasomatic zones developed along the fault systems. Results of a factor analysis of whole-rock chemical compositions including the abundance of diamond confirm a close relationship of diamond content with metasomatic rocks, and demonstrate that factors characterizing metasomatic processes also reflect the diamond content in rocks from both the Kumdy-Kol and the Barchi-Kol deposits. However, the fluids that produced metasomatic alterations were different at these two localities. In the case of the former, predominantly hydrous fluid carried a moderate amount of CO2, whereas at Barchi-Kol, the fluid was rich in CO2. Crystals of diamond occur in intergranular interstices and within the grains of the rock-forming minerals. Their distribution is not random but tends to be associated with fractures in rocks and rock-forming minerals, including secondary minerals. Diamond grains form chains and clusters along the fractures. Diamondiferous clusters are morphologically variable: five to ten microcrystals may form 2D patterns; 3D botryoidal aggregates are observed as well. These data confirm the hypothesis favoring a crustal fluid - metasomatic origin of diamond in the metamorphic sequence of the Kokchetav Massif.
    Print ISSN: 0008-4476
    Topics: Geosciences
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  • 3
    Publication Date: 2008-05-29
    Print ISSN: 0935-1221
    Electronic ISSN: 1617-4011
    Topics: Geosciences
    Published by Schweizerbart
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