DIAMOND CRYSTALLIZATION AND PHASE COMPOSITION IN THE FeNi – GRAPHITE – CaCO3 SYSTEM AT 5.5 Gpa

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An experimental simulation of diamond crystallization in the system FeNi - graphite - calcium carbonate at a pressure of 5.5 GPa and a temperature of 1400℃ was carried out. Two sample assembly configurations were used. In the first one – the starting materials were put layer by layer, and in the second one - the components were mixed. It has been established that calcium carbonate, when interacting with the FeNi-melt, decomposes with the formation of Ca,Fe oxides and the release of CO2. Magnetite may be present as an accessory phase. Due to the formation of solid reaction products (Ca,Fe oxides) during layer-by-layer filling of the growth volume, the presence of calcium carbonate between graphite and FeNi-melt prevents diamond crystallization in the graphite layer and carbon transport to diamond seed crystals. When the components are mixed in the growth volume, diamond synthesis and growth onto seed crystals occur. The phenomenon of segregation of diamond crystals together with calcium carbonate and oxide phases, the products of the reaction in the bulk of the metal, has been discovered. Aliphatic, cyclic, and oxygenated hydrocarbons, including heavy compounds (C13-C17), CO2, H2O, nitrogen- and sulfonated compounds, were identified in the fluid phase captured by diamonds in the form of inclusions during growth. The composition of the fluid phase in the studied diamonds is more oxidized compared to the composition of fluid inclusions in diamonds grown in the FeNi – graphite system without carbonate. The results obtained correlate with the data on natural diamonds, among which there are crystals with “essentially carbon dioxide” compositions of fluid inclusions, which indicates the possible participation of crustal carbonate matter in the processes of diamond formation during subduction into the deep mantle.

作者简介

V. Sonin

Sobolev Institute of Geology and Mineralogy Siberian Branch Russian Academy of Sciences

Email: sonin@igm.nsc.ru
Pr-t Akademika Koptyuga, 3, Novosibirsk 630090, Russia

A. Tomilenko

Sobolev Institute of Geology and Mineralogy Siberian Branch Russian Academy of Sciences

Email: tomilen@igm.nsc.ru
Pr-t Akademika Koptyuga, 3, Novosibirsk 630090, Russia

E. Zhimulev

Sobolev Institute of Geology and Mineralogy Siberian Branch Russian Academy of Sciences

Email: tomilen@igm.nsc.ru
Pr-t Akademika Koptyuga, 3, Novosibirsk 630090, Russia

T. Bul’bak

Sobolev Institute of Geology and Mineralogy Siberian Branch Russian Academy of Sciences

Email: tomilen@igm.nsc.ru
Pr-t Akademika Koptyuga, 3, Novosibirsk 630090, Russia

A. Chepurov

Sobolev Institute of Geology and Mineralogy Siberian Branch Russian Academy of Sciences

Email: tomilen@igm.nsc.ru
Pr-t Akademika Koptyuga, 3, Novosibirsk 630090, Russia

T. Timina

Sobolev Institute of Geology and Mineralogy Siberian Branch Russian Academy of Sciences

Email: tomilen@igm.nsc.ru
Pr-t Akademika Koptyuga, 3, Novosibirsk 630090, Russia

A. Chepurov

Sobolev Institute of Geology and Mineralogy Siberian Branch Russian Academy of Sciences

Email: tomilen@igm.nsc.ru
Pr-t Akademika Koptyuga, 3, Novosibirsk 630090, Russia

N. Pokhilenko

Sobolev Institute of Geology and Mineralogy Siberian Branch Russian Academy of Sciences

编辑信件的主要联系方式.
Email: tomilen@igm.nsc.ru
Pr-t Akademika Koptyuga, 3, Novosibirsk 630090, Russia

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