Composition of a carbonatitic melt in equilibrium with lherzolite at 5.5–6.3 GPa and 1350°C


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Generation of ultra-alkaline melts by the interaction of lherzolite with cardonatites of various genesis was simulated at the PT parameters typical of the base of the subcratonic lithosphere. Experiments with a duration of 150 h were performed at 5.5 and 6.3 GPa and 1350°C. The concentrations of CaO and MgO in melts are buffered by the phases of peridotite, and the concentrations of alkalis and FeO depend on the composition of the starting carbonatite. Melts are characterized by a low (<7 wt %) concentration of SiO2 and Ca# from 0.40 to 0.47. It is demonstrated that only high-Mg groups of carbonatitic inclusions in fibrous diamonds have a composition close to that of carbonatitic melts in equilibrium with lherzolite. Most likely, the formation of kimberlite-like melts relatively enriched in SiO2 requires an additional source of heat from mantle plumes and probably H2O fluid.

作者简介

A. Kruk

Sobolev Institute of Geology and Mineralogy, Siberian Branch; Novosibirsk State University

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Email: krukan@igm.nsc.ru
俄罗斯联邦, pr. Akad. Koptyuga 3, Novosibirsk, 630090; Novosibirsk

A. Sokol

Sobolev Institute of Geology and Mineralogy, Siberian Branch; Novosibirsk State University

Email: krukan@igm.nsc.ru
俄罗斯联邦, pr. Akad. Koptyuga 3, Novosibirsk, 630090; Novosibirsk

D. Chebotarev

Sobolev Institute of Geology and Mineralogy, Siberian Branch; Novosibirsk State University

Email: krukan@igm.nsc.ru
俄罗斯联邦, pr. Akad. Koptyuga 3, Novosibirsk, 630090; Novosibirsk

Yu. Palyanov

Sobolev Institute of Geology and Mineralogy, Siberian Branch; Novosibirsk State University

Email: krukan@igm.nsc.ru
俄罗斯联邦, pr. Akad. Koptyuga 3, Novosibirsk, 630090; Novosibirsk

N. Sobolev

Sobolev Institute of Geology and Mineralogy, Siberian Branch; Novosibirsk State University

Email: krukan@igm.nsc.ru
俄罗斯联邦, pr. Akad. Koptyuga 3, Novosibirsk, 630090; Novosibirsk

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