Sulfide melts-graphite interaction at HPHT conditions: Implications for diamond genesis

被引：61

作者：

Palyanov, Yu. N. ^{[1
]}

Borzdov, Yu. M. ^{[1
]}

Khokhryakov, A. F. ^{[1
]}

Kupriyanov, I. N. ^{[1
]}

Sobolev, N. V. ^{[1
]}

机构：

[1] Russian Acad Sci, Siberian Branch, Inst Geol & Mineraol, Novosibirsk 630090, Russia

来源：

EARTH AND PLANETARY SCIENCE LETTERS | 2006年 / 250卷 / 1-2期

基金：

俄罗斯基础研究基金会;

关键词：

carbon; sulfides; diamond formation; high-pressure and high-temperature experiments; HIGH-PRESSURE; CARBONATE MELTS; MANTLE; INCLUSIONS; GROWTH; SULFUR; FLUIDS; CONSTRAINTS; KIMBERLITE; PYRRHOTITE;

D O I：

10.1016/j.epsl.2006.06.049

中图分类号：

P3 [地球物理学]; P59 [地球化学];

学科分类号：

0708 ; 070902 ;

摘要：

The interaction of graphite with (Fe,Ni)(9)S-8 and FeS sulfide melts has been studied at P = 6.3-7.5 GPa and T = 1450-2200 degrees C in experiments with a duration from 2 to 65 h. It has been found that both pentlandite and pyrrhotite melts interacting with graphite show similar behavior. At < 7.5 GPa and 1450-1800 degrees C and at 7.5 GPa and 1600 degrees C carbon crystallizes predominantly as metastable graphite and to the minor extent as diamond on the seed crystals. Only at a pressure of 7.5 GPa and a temperature of 1600 degrees C and higher, sulfide melts provide spontaneous diamond nucleation at the melt-graphite interface and directly within carbon-saturated sulfide melt. In this case no metastable graphite was found in the products. Diamond crystals synthesized in the (Fe,Ni)(9)S-8-C system were found to contain nitrogen impurity with concentrations of an order of 1000 ppm and exhibited IR absorption peaks due to hydrogen. The luminescence measurements revealed specific optical centers related to nickel impurity in the crystals. It is concluded that sulfide melts are less efficient diamond forming media as compared to carbonate, carbonate-silicate-fluid and fluid systems. The results of the study suggest that diamond nucleation from carbon-supersaturated sulfide melt as supposed in the sulfide model of diamond genesis seems improbable at the UHP conditions of the formation of most natural diamonds. (c) 2006 Elsevier B.V. All rights reserved.

引用

页码：269 / 280

页数：12

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