Микрокристаллические Алмазы В Океанической Литосфере И Их Возможная Природа

Галимов, Э. М.; Севастьянов, В. С.; Карпов, Г. А.; Шилобреева, С. Н.; Максимов, А. П.

doi:10.7868/s0869565216190166

Докл. РАН

2016

DOI: 10.7868/s0869565216190166

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Микрокристаллические Алмазы В Океанической Литосфере И Их Возможная Природа

Э. М. Галимов¹,

В. С. Севастьянов²,

Г. А. Карпов³

et al.

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Cited by 2 publications

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References 7 publications

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“…However, the starting material can be not only graphite and not only a strong impact can stimulate the synthesis of diamond, for example, cavita tion of gas bubbles in moving magma [44]. Investigation of the geochemical characteristics of microdiamond particles found in the products of the eruption of the Tolbachik volcano in Kamchatka, and analysis of the totality of the data obtained, allowed the authors of [45] to conclude that diamonds were formed during fluid cavitation. On the whole, the significance and role of shock (explosive) events in the history of the for mation of polycrystalline diamond and its polymorphic modi fications were decisive.…”

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confidence: 99%

Compound physical and mechanical effects stimulating metastable diamond formation

Соболев¹,

Kovrov²,

Nalisko³

et al. 2021

Nauk. visn. nat. hirn. univ.

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Purpose. To synthesize diamond polycrystals in a thermodynamically stable region, and to grow up a single crystal shell under conditions of thermodynamic metastability. To investigate some physical properties and features of the internal structure for synthesized single crystals for the development of new models and hypotheses regarding the issue of diamond genesis. Methodology. Experimental studies using shock-wave effects on a metal alloy containing non-diamond carbon. Methods of infrared and ultraviolet spectroscopy, X-ray phase analysis, electron paramagnetic resonance, isotope analysis, differential thermal analysis, electron microscopy, and others are used. The synthesis of nanocrystalline diamond particles as nuclei for growing single crystals is carried out by the shock-wave method using profiled shock waves. Findings. A complex of physicochemical methods for studying the grown diamond monocrystals has been carried out. The reasons for the discrete growth of diamond and the retention of the central inclusion (a polycrystalline diamond of shock-wave origin) in the process of growth have been established and analyzed. It is shown that the discreteness of diamond formation is characteristic only for thermodynamically metastable conditions. The results of the experiments give grounds to make an assumption about the metastable growth, including of diamonds from primary deposits. Originality. The hypothesis has been developed concerning the origin of diamond nanoparticles in interstellar carbon clouds which refer exclusively to central polycrystalline inclusions in a monocrystal diamond shell. The hypothesis eliminates the scientific contradiction that arises in all cases when attempts are made to interpret the natural discreteness of diamond formation based on the regularities of the graphite-diamond state diagram. Possible causes of discrete diamond formation in nature and the scenario of the formation of diamond nanocrystals in an interstellar cloud of atomic carbon have been considered. Practical value. The value of the experimental research results refers to the development of a non-energy-intensive technology for the growing large diamond monocrystals at temperatures of 5001400 K, and pressures of 105107 Pa.

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mentioning

confidence: 99%

Compound physical and mechanical effects stimulating metastable diamond formation

Соболев¹,

Kovrov²,

Nalisko³

et al. 2021

Nauk. visn. nat. hirn. univ.

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On the presence of the postmagmatic stage of diamond formation in kimberlites

Simakov¹,

Stegnitskiy²

2022

PMI

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On nowadays multiphase and the facies heterogeneity of the formations are distinguished at the study of kimberlite pipes. Most researchers associate the formation of diamonds only with the mantle source. To date, satellite minerals with specific compositions associated with kimberlite diamonds have been identified as deep mantle diamond association. They are extracted from the concentrate of the kimberlites heavy fraction and may reflect the diamond grade of the pipe. For some minerals in the diamond association, however, they can not be reliable. Some researchers also revealed shallow diamond associations, related to the formation of serpentine, calcite, apatite, and phlogopite. There is recent data on the formation of diamonds in rocks of the oceanic crust. In the last years microdiamonds were identified in chromites of the oceanic crust in association with antigorite formed at 350-650 °C and 0.1-1.6 GPa. As a result, the authors established a postmagmatic kimberlitic stage of diamond formation associated with secondary mineral associations based on the experimental and mineralogical data for the conditions of the shallow upper mantle and crust. Mineralogical and petrographic studies of Angolan kimberlite pipe show that antigorite is the indicator mineral of this stage.

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Микрокристаллические Алмазы В Океанической Литосфере И Их Возможная Природа

Cited by 2 publications

References 7 publications

Compound physical and mechanical effects stimulating metastable diamond formation

Compound physical and mechanical effects stimulating metastable diamond formation

On the presence of the postmagmatic stage of diamond formation in kimberlites

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