Russian Journal of Earth Sciences Russian Journal of Earth Sciences Russian Journal of Earth Sciences 1681-1208 46597 10.2205/2019ES000677 ОРИГИНАЛЬНЫЕ СТАТЬИ ORIGINAL ARTICLES ОРИГИНАЛЬНЫЕ СТАТЬИ Poroelastic response to rapid decarbonatisation as a mechanism of the diamonds formation in the mantle wedge of Kamchatka Poroelastic response to rapid decarbonatisation as a mechanism of the diamonds formation in the mantle wedge of Kamchatka Simakin A G Simakin A G simakin@ifz.ru Institute of the Earth Physics RAS; Institute of Experimental Mineralogy RAS ru Institute of the Earth Physics RAS; Institute of Experimental Mineralogy RAS ru 19 5 29 10 2021 https://rjes.ru/en/nauka/article/46597/view

Various geodynamic mechanisms can lead to the penetration of siliceous carbonates into the mantle wedge. Their thermal decomposition in the "mantle olivine autoclave" can be a mechanism for the formation of diamond erupted in subduction zone of Kamchatka. Using the theory of poroelasticity, we showed that rapid heating of a mixture of sideritic dolomite and silica on 150-200° C in the closed system conditions can temporarily lead to an increase in the fluid pressure by 2-3 GPa. With the initial parameters P=2" role="presentation" style="position: relative;">P=2P=2P = 2 GPa and T=830" role="presentation" style="position: relative;">T=830T=830T = 830° C, the carbonic fluid produced during the reaction would get into the PT stability field of the diamond. The growth of diamond at the fluid decomposition in the PT field of metastable graphite can be enhanced by microparticles of native Ni and Mn formed by the thermal decomposition of gaseous metals carbonyls. The corresponding abundant micro-inclusions of Ni and Mn were found in Kamchatka diamonds.

Various geodynamic mechanisms can lead to the penetration of siliceous carbonates into the mantle wedge. Their thermal decomposition in the "mantle olivine autoclave" can be a mechanism for the formation of diamond erupted in subduction zone of Kamchatka. Using the theory of poroelasticity, we showed that rapid heating of a mixture of sideritic dolomite and silica on 150-200° C in the closed system conditions can temporarily lead to an increase in the fluid pressure by 2-3 GPa. With the initial parameters P=2" role="presentation" style="position: relative;">P=2P=2P = 2 GPa and T=830" role="presentation" style="position: relative;">T=830T=830T = 830° C, the carbonic fluid produced during the reaction would get into the PT stability field of the diamond. The growth of diamond at the fluid decomposition in the PT field of metastable graphite can be enhanced by microparticles of native Ni and Mn formed by the thermal decomposition of gaseous metals carbonyls. The corresponding abundant micro-inclusions of Ni and Mn were found in Kamchatka diamonds.

 Poro-elasticity decarbonatisation diamond carbon monoxide mantle wedge Kamchatka Poro-elasticity decarbonatisation diamond carbon monoxide mantle wedge Kamchatka The author thanks Prof. A. Ghassemi (Oklahoma Univ., USA) for valuable comments and discussion on poroelastic computations. Critical review by V. I. Silaev, A. E. Sukharev (Institute of Geology, URO RAS, Syktyvkar) significantly improved manuscript.

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