Composition of a carbonatitic melt in equilibrium with lherzolite at 5.5–6.3 GPa and 1350°C
- Авторлар: Kruk A.N.1,2, Sokol A.G.1,2, Chebotarev D.A.1,2, Palyanov Y.A.1,2, Sobolev N.V.1,2
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Мекемелер:
- Sobolev Institute of Geology and Mineralogy, Siberian Branch
- Novosibirsk State University
- Шығарылым: Том 467, № 1 (2016)
- Беттер: 303-307
- Бөлім: Geochemistry
- URL: https://ogarev-online.ru/1028-334X/article/view/188199
- DOI: https://doi.org/10.1134/S1028334X16030181
- ID: 188199
Дәйексөз келтіру
Аннотация
Generation of ultra-alkaline melts by the interaction of lherzolite with cardonatites of various genesis was simulated at the P–T 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.
Негізгі сөздер
Авторлар туралы
A. Kruk
Sobolev Institute of Geology and Mineralogy, Siberian Branch; Novosibirsk State University
Хат алмасуға жауапты Автор.
Email: krukan@igm.nsc.ru
Ресей, 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
Ресей, 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
Ресей, 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
Ресей, 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
Ресей, pr. Akad. Koptyuga 3, Novosibirsk, 630090; Novosibirsk
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