Инд. авторы:	Chepurov A.I., Zhimulev E.I., Chepurov A.A., Sonin V.M.
Заглавие:	Where did the largest diamonds grow? The experiments on percolation of Fe-Ni melt through olivine matrix in the presence of hydrocarbons
Библ. ссылка:	Chepurov A.I., Zhimulev E.I., Chepurov A.A., Sonin V.M. Where did the largest diamonds grow? The experiments on percolation of Fe-Ni melt through olivine matrix in the presence of hydrocarbons // Lithos. - 2021. - Vol.404-405. - Art.106437. - ISSN 0024-4937. - EISSN 1872-6143.
Внешние системы:	DOI: 10.1016/j.lithos.2021.106437; РИНЦ: 47037582; WoS: 000702853400005;
Реферат:	eng: Recently it was found that large natural diamonds can grow from a metal liquid. One of the principal issues of the proposed hypothesis is the formation of so-called "pockets" filled with Fe-Ni melt and hydrocarbons in the Earth's mantle. The existing models of Fe migration imply percolation of liquid melt through interconnected interstices between silicate minerals, although these models face several fundamental problems in explaining the process of penetration of Fe melt between solid crystalline phases like silicate and oxide minerals. The aim of the present study is to contribute to the mechanism of Fe-Ni melt migration, and to elucidate the evolution of the "pockets" in the presence of hydrocarbons. The experiments were performed using a high-pressure apparatus "BARS" at pressures 3 and 5 GPa, and temperature 1600 degrees C. A silicate matrix consisting of natural olivine grains was used. The interstices in olivine were filled with anthracene that decomposes under high P-T into a complex hydrocarbon fluid. Percolation of Fe-Ni (64/36 wt%) melt through the interstices was demonstrated which occurred at relatively high rates. The basis of the proposed mechanism is "solubility-enhanced infiltration": Fe-Ni occupies the space filled with light elements or substances that are soluble in the melt. It is suggested that the following simple, but efficient mechanism supports the growth of large diamonds as well as their resorption and storage within silicate mantle of the Earth for a long time.
Ключевые слова:	Percolation; High-pressure high-temperature; CORE FORMATION; HIGH-PRESSURE; CATALYZED HYDROGENATION; DIHEDRAL-ANGLE; IRON PARTICLES; FLUID INCLUSIONS; SYSTEM; MANTLE; S LIQUID; Diamond; Fe-Ni; SILICATE MINERALS; Earth's mantle;
Издано:	2021
Физ. характеристика:	106437
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