Diamond crystallization in the Fe-Co-S-C and Fe-Ni-S-C systems and the role of sulfide-metal melts in the genesis of diamond
Diamond crystallization in the Fe-Co-S-C and Fe-Ni-S-C systems and the role of sulfide-metal melts in the genesis of diamond
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DOI：
10.1134/s0016702912030111
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发表时间：
2012-03
影响因子：
0.8
通讯作者：
E. Zhimulev;A. Chepurov;E. Sinyakova;V. Sonin;A. Chepurov;N. Pokhilenko
中科院分区：
文献类型：
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作者：
E. Zhimulev;A. Chepurov;E. Sinyakova;V. Sonin;A. Chepurov;N. Pokhilenko
在 Fe-Co-S-C 和 Fe-Ni-S-C 系统中的 BARS 分流球多砧高压装置中，在 5.5 GPa 的压力和 1300°C 的温度下进行实验，合成了 0.1-0.8 克拉的金刚石晶体。详细研究了样品的微观结构和伴随金刚石的相（碳化物、石墨、单硫化物固溶体、镍黄铁矿和镍纹石），讨论了金属-硫化物-碳合金的性能，并考虑了与金刚石中硫化物夹杂物的成因和金刚石稳定性领域中的石墨结晶相关的问题。实验表明，钻石可以在硫含量高达 14 wt% 的预共晶金属硫化物熔体中以相对较低的 P-T 参数合成和生长，这些参数对应于地球上地幔深处约 150 公里处天然钻石形成过程的可能温度和压力。
Diamond crystals 0.1–0.8 carats were synthesized in experiments conducted in a BARS split-sphere multianvil high-pressure apparatus in the systems Fe-Co-S-C and Fe-Ni-S-C at a pressure of 5.5 GPa and temperature of 1300°C. The microtextures of the samples and the phases accompanying diamond (carbides, graphite, monoslufide solid solution, pentlandite, and taenite) are examined in much detail, the properties of metal-sulfide-carbon alloys are discussed, and issues related to the genesis of sulfide inclusions in diamonds and graphite crystallization in the diamond stability field are considered. The experiments demonstrate that diamonds can be synthesized and grow in pre-eutectic metal-sulfide melts with up to 14 wt % sulfur at relatively lowP-Tparameters, which correspond to the probable temperatures and pressures of natural diamond-forming processes at depths of approximately 150 km in the Earth’s upper mantle.